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UNIVERSALENERGY | ENVIRONMENTAL
Blower Silencers
Absorptive Silencers
Vent/Fan Silencers
Separator Silencers
Engine Silencers
Industrial Filters & Filter/Silencers
Accessories
FULL-LINE INDUSTRIAL
CATALOG
General Information 1.1
Blower Silencers 2.1
Absorptive Silencers 3.1
Vent Silencers 4.1
Industrial Fan Silencers 5.1
Vacuum Pump Liquid Separator-Silencers
6.1
Engine Exhaust Silencers 7.1
Filters and Filter-Silencers 8.1
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Table of ContentsFull-Line Catalog
NoteAll dimensions in inches and weights in pounds, unless otherwise indicated.
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General Information G
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Company Profile
Babcock & Wilcox Universal (B&W Universal) is a global provider of custom-engineered ancillary equipment and solutions to the power generation, oil and gas, industrial processing, rail transportation and backup power markets. For more than half a century, OEMs, EPCs, packagers and end-users have relied on B&W Universal to engineer acoustic and emission/filtration systems to meet their specific needs.
Our comprehensive single-sourced solutions meet environmental, regulatory and operational requirements and help operators reduce costs, improve the efficiency of equipment, and achieve safety and compliance targets. We offer a systems portfolio featuring exhaust and inlet systems, including silencers, ducts, structural steel, dampers/diverters and filters for gas turbines, and diesel and natural gas engines.
We’ve been custom-engineering and perfecting ancillary equipment and solutions for more than a half century for both new and retrofit projects. We bring proven global experience with custom-designed systems installed on all major turbine brands. And we help customers around the world with applications from 5 megawatts to as large as several hundred megawatts meet clean, quiet air regulations safely and efficiently.
B&W Universal manufactures a complete line of noise control and air filtration solutions for industrial processing within a wide range of industries, delivering thousands of quality components to the industrial power market each year. Whether your processing needs require standard silencing, custom silencing or filtration, we are your single source for a complete solution.
Silencer Sizing
Proper silencer sizing requires the following information:
A exhaust flow rate (m3/sec)
B silencer inlet size (mm2)
C level of silencing required
Calculate exhaust gas velocity by dividing the flow rate by the pipe area:
Reference the pressure drop curve in the silencer spec sheets. Using the calculated exhaust gas velocity, find the corresponding estimated pressure drop on the curve. If you have selected a silencer that achieves your silencing level requirements at an acceptable pressure drop level, you have identified the silencer that is right for you!
Selection Assistance
If you need help with silencer selection and sizing, please contact your nearest B&W Universal office. A list of locations and phone numbers are available from our website at: www.babcock.com/universal or you can call: +1-888-300-4272.
Notes
Keep in mind that silencers are not designed to support their weight from the inlet or outlet tube, or support other components of the exhaust system, such as stacks. For the most efficient operation of all silencing units, proper mounting attachments are required. Domed heads or flat plates with gussets vary by model and size.
exhaust flow rate (m3/sec)
silencer inlet pipe area (m2)
Rotary Positive BlowersThe Rotary Positive Blower is a two impellercompressor that delivers a large quantity ofgas or air relative to the individual pulses.Blower capacities are expressed in CFM atinlet conditions (ICFM). Blower size is usuallyexpressed as gear diameter by rotor length.Pitch Line Velocity (PLV) is the peripheralvelocity of the timing gear—equal to theproduct of the gear circumference and therotative speed of the blower, usuallyexpressed in feet per minute (FPM).
The blower presents two problems:1) pulsation within the piping system and,2) noise radiation in the vicinity of the blowerand piping.
The importance of these relative to each otheris a function of blower size and speed; bothincrease proportionately to the blower sizeand the square of the speed.
Pulsation is more pronounced on thedischarge side. Peak pulse pressures are quitesevere and can result in unsilenced dischargesound power levels up to 140–145 dB. Theinlet, although producing less severe pulsationand noise, receives equal attention since theinlet is usually open to atmosphere and thenoise much more apparent.
SilencersThere is little question that silencers are anecessity on any blower installation.Regardless of the size or speed of the blower,silencers of some type are nearly always used.
In the selection of blower silencers, there aretwo basic considerations: 1) the silencer mustbe the correct size (i.e., sufficient capacity forthe volume flow) and, 2) the silencer must bethe proper type for the application. Thenominal silencer size need only be based onthe gas volume, (i.e., the CFM of the gas orair at the operating conditions). However, thesilencer (design) must be selected withconsideration of the blower size andoperating speed. Complete application andcapacity information is given on page 2.3.
There are two types of silencers commonlyused on positive blowers: a reactive typesilencer which consists of a series ofexpansion chambers having interconnecting
tubes, a more sophisticated silencer design. is the combination chamber-absorptive type. This combination silencer is similar to the reactive type with the exception that an acoustically-packed, sound absorbing section is included, comprising an extension of the silencer connection closest to the blower. The inlet of a discharge silencer and the outlet of an inlet silencer are the ends having the packed section.
A third basic type of silencer—the simple, straight-through packed type—is occasionally used on blowers. This type of silencer is usually used on small, high speed machines which characteristically produce significant high frequency noise and relatively mild pulsations.
The PLV is normally the criterion for silencer type selection. If the blower is operating in the critical PLV range, it will generate objectionable high frequency noise which may cause shell ring or tank hammer in the piping and silencer. These critical PLV conditions will always require a combination chamber-absorptive silencer for satisfactory results.
Inlet SilencersFor inlet service, a PLV of 3,300 ft/min or greater is considered critical. This transition speed is empirically established and is somewhat arbitrary, however, it is commonly accepted that blowers operating at or above 3,300 ft/min are considered critical for the purpose of inlet silencer application. Those operating below 3,300 ft/min are considered subcritical. Subcritical PLV applications can usually be silenced adequately with a chamber-type silencer, such as B&W Universal URB or UCI Series. Blowers operating above the critical PLV of 3,300 ft/min will invariably require the RIS Series combination chamber-absorptive type silencer. Inlet Filters or Filter Silencers are commonly used on blower inlets, either individually or in series with a separate inlet silencer. Please reference the Filters and Filter Silencers section of this catalog for further information.
Discharge SilencersFor the more severe discharge conditions of typical blower installations, a PLV of2,700 ft/min is accepted as the critical transition speed. Blowers operating below 2,700 ft/min are considered subcritical and can usually be adequately silenced on the discharge side by use of a chamber-type silencer UCD or URD Series. Machines operating above the 2700 ft/min transition speed will require combination chamber-absorptive silencers such as SD or RD Series.
In some larger blower installations, piping requirements or space restrictions may preclude the use of a large, single discharge silencer such as the SD or RD Series.
Where two or more blowers discharge into a common header, individual silencers upstream of the header are required to subdue the individual blower pulsations. Otherwise, the pulsations tend to beat with each other and can be extremely objectionable.
Note: Silencers should be mounted as close to the blower as possible since any piping between the blower and silencer will radiate noise. Standard silencer connections are not designed to carry external piping or valve loads, so good piping support practices should be used to prevent stresses that cause fatigue and eventual fracture of the silencer or piping. It is also good practice to isolate the blower from the silencer with a flexible expansion joint. Contact B&W Universal for special design considerations where loading is a factor.
Attenuation CurvesNoise attenuation curves are given for the various models within this section. The curves represent insertion loss of airborne noise for typical applications under average conditions. It is not feasible to chart the expected performance of a silencer over a wide range of applications and conditions, therefore, the curves must be used with discretion. Structure-borne noise (see above) may be a consideration and will require separate analysis, since it is not airborne noise and not used for silencer performance rating.
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GeneralInformationBlower Silencers
In a closed blower discharge system,structure-borne noise—such as that radiatedby pipe wall and silencer shell—may be aconsideration, particularly where a stringent,close-proximity noise specification applies. For these applications, various means areavailable to treat the pipe and shell radiatednoise, such that most reasonablespecifications may be met.
For instance, it is possible to lag the silencer
shell externally and reduce any shell noise contribution to below the casing and mechanical noise of the blower and driving machinery.
B&W Universal invites your inquiries concerning special applications where EPA, OSHA or other noise specifications apply. Special applications are handled on an individual basis and recommendations are made according to specific requirements of the installation.
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GeneralInformation
Rotary Positive Blowers
The silencers shown below are more fullydescribed on the individual catalog pages.These units are designed specifically for useon Rotary Positive Blowers.
There are fundamental similarities betweenblower silencers and other types, particularlyreciprocating engine silencers, which alsorequire a silencer design that provideseffective pulse control as well as noise
attenuation. However, blower silencersgenerally must be constructed moreruggedly to withstand prolonged exposure tosevere pulsations produced by the blower.
All silencers described are of standard withend in, end-out design. Low or high sideinlet and outlet connections are availableand are described on the individual catalog pages.
UCI SeriesInlet SilencerChamber-type inlet silencer for use on sub-critical PLV applications. Available in pipe sizes 8"–14". Smaller sizes use URB Series. Available with side connections and mounting brackets.
RIS SeriesInlet SilencerCombustion chamber-absorptive type inlet silencer for critical PLV applications. Available in pipe sizes 2"–16". Low or high side outlet and mounting brackets available on most sizes.
UCD SeriesURB/URD SeriesDischarge SilencersChamber-type discharge silencer for use on sub-critical PLV applications. Available in pipe sizes 8"–14". (Smaller sizes use URB Series). Low, high, or opposed side connections and mounting brackets available.
SD SeriesRD SeriesDischarge SilencersCombination chamber-absorptive type discharge silencers for critical PLV applications. Available in pipe sizes 4"–14". Low, high, or opposed side connections and mounting brackets available on most sizes.
Accessories,Special Features
Mounting BracketsInspection OpeningsPressure Vessel Construction
Oversize FlangesSpecial FinishesSpecial Materials
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Transition Speed-RPM
Application,Capacity,Pressure Drop DataBlower Silencers
BlowerGear Size Inlet Discharge
22¹⁄₂
345678
1012141618202224
6,3005,0404,2003,1502,5202,1001,8001,5751,2601,050
900785700630570525
5,1554,1253,4352,5752,0601,7201,4701,2901,030
860735645570515470430
Blower Transition Speed1
Pitch LineVelocity
BelowTransition
InletSilencer
UCI, URB
DischargeSilencer
URB, UCD,URD
AboveTransition RIS SD, RD
Silencer Model Specifications2
! "!P = V4005
2c
!P ! ! " c " "V4005
P14.7
530T
Silencer RecommendationsAs mentioned on page 2.1 pitch line velocity(PLV) is the speed of the timing gear in feetper minute (ft/min). For purposes of silencerapplication. PLV is considered “critical” at3,300 ft/min for intake and 2,700 ft/min fordischarge.
Table 1 gives transition speeds in RPM.Blowers running at these speeds or greaterwill have critical PLV. Operating speeds belowtransition will be in the sub-critical range.Blowers operating in the sub-critical speedrange usually require only simple chamber-type silencers while those in the critical rangerequire combination chamber-absorptive typesilencers. If there is doubt, it is best to usethe combination-type silencers. When gearsize and operating speeds are known, theproper type silencer is easily selected.
Silencer Size Selection, CapacityTable 3 gives the nominal capacity of thevarious size silencers. “Size” in this tablerefers to the silencer “nominal size,” or its“inlet size.” Capacities are expressed in inletCFM (ICFM), thus, discharge silencers arerated at higher capacities than inlet silencerssince the air is compressed to reducedvolume at the discharge operating pressure.
A From Table 1 determine whether blowerRPM is above or below the transitionspeed for critical PLV.
B Consult Table 2 for recommendedsilencer models.
Pressure DropThe following formulas may be used tocalculate pressure drop through thesilencers covered in this catalog.
Inlet:
(assumes silencer inletis open to atmosphere)
Discharge:
!P = pressure drop through silencer,inches of water
V = air velocity through silencer,ft/min*
c = individual silencer restrictioncoefficient—empirical constant(see Table 4)
P = discharge pressure, PSIA(operating pressure in PSIG + 14.7)
T = discharge temperature, ˚Rabsolute (operating temperature in˚F + 460)
* To calculate velocity through silencer, divide flow inACFM by cross-sectional area of silencer inlet diameterin square feet.
2
Size
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618202224262830
Est Temp.
3070
120190270370480750
1,0801,9203,0004,3005,9007,7009,700
12,00014,50017,30020,30023,50027,000
70˚F
3580
140220320430560880
1,2602,2503,5205,0706,8909,000
11,40014,00017,00020,20023,80027,60031,700115˚F
4085
150235335455600935
1,3402,3903,7305,3707,3109,550
12,10014,90018,10021,50025,20029,30033,600140˚F
4090
160245355480630985
1,4102,5103,9305,6607,700
10,00012,70015,70019,00022,60026,60030,80035,400165˚F
4095
165255370505660
1,0301,4802,6304,1105,9208,060
10,50013,30016,40019,90023,70027,80032,20037,000190˚F
45105185285415560735
1,1501,6502,9404,5906,6008,990
11,80014,90018,40022,20026,40031,00036,00041,300240˚F
Silencer Capacity3
Inlet Silencer4 PSIG
Discharge Silencer
Capacity (Inlet CFM 14.7 PSIA at 70˚F)
6 PSIG 8 PSIG 10 PSIG 15 PSIG
URB, URBYUCI, UCIY, UCIHRIS, RISY, RISHUCD, UCDYURD, URDY, URDHSD, SDY, SDHRD, RDY, RDHRDS, SDS, URDS
4.24.24.24.24.24.24.27.0
Model Pressure DropCoefficient (C)
Pressure Drop Coefficients4
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SpecificationsUCI Group
Chamber TypeInlet Silencer
40
50
63 125 250 500 1K 2K 4K 8K
30
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
10
0
20
The UCI Series Inlet Silencer is a heavy duty, all welded unit offering standard attenuation. Silencers are constructed of carbon steel, designed to provide long service life. The UCI Series is designed for pulse control and silencing for most subcritical PLV applications.
Silencers are designed for either vertical or horizontal mounting. Designs will allow for low or high side outlets for mounting flexibility. Low side outlet versions are designated as “UCIY” and the high side outlet versions are designated as “UCIH.”
DrainP
N
N
L H D
K
Y
K
Y
UCI Series UCIY Series(Low Side Outlet)
UCIH Series(High Side Outlet)
Exterior surfaces are coated with rust inhibitive primer, and may be finish coated in the field if required. Other coating options are available upon request. Brackets and other mounting options are also available. Silencers with connection sizes of 8” and above are equipped with 125/150 ANSI Drilled Plate Flanges.
PartNumber D L N H K
Min Max
P(Size)
Min Max
UCIY UCIH
Y
Weight
Chamber Type Inlet Silencers
Sizes 1"–6" Use URB Series (page 2.7)
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
53-108-AA53-110-AA53-112-AA53-114-AA
22263030
45¹⁄₂
6980¹⁄₂
250360550
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214
61748799
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
54678092
14¹⁄₂
16¹⁄₂
18¹⁄₂
911
13¹⁄₂
2127
40
28¹⁄₂
34¹⁄₂
47¹⁄₂ 650
57413412¹⁄₂18¹⁄₂
For silencer sizes 6” and below, use the URB Series.For silencer inlet sizes above 14” please contact B&W Universal for price and availability.
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SpecificationsRIS GroupCombination Chamber-Absorptive TypeInlet Silencer
PartNumber D L N H
54-102-AA54-125-AA54-103-AA54-135-AA54-104-AA54-105-AA54-106-AA54-108-AA54-110-AA54-112-AA54-114-AA54-116-AA
888
101012141822263036
28¹⁄₂
333939¹⁄₂
4557¹⁄₂
64728598
111113
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
22¹⁄₂
273333¹⁄₂
3951¹⁄₂
58657891
104106
8¹⁄₂
9101112¹⁄₂
15¹⁄₂
1721¹⁄₂
25¹⁄₂
29¹⁄₂
3035¹⁄₂
————
14¹⁄₂
17¹⁄₂
2026¹⁄₂
32¹⁄₂
384049¹⁄₂
————
2¹⁄₄
2³⁄₄
3¹⁄₄
4567¹⁄₂
0
FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 8
7¹⁄₂
99
1213¹⁄₂
1516¹⁄₂
18¹⁄₂
16¹⁄₂
2325¹⁄₂
30¹⁄₂
37445051
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
RISY RISH
KE
Min Max
RISYY
Weight
252530405080
110190380550800
1,050
Combination Chamber-Absorptive Type Inlet Silencers
Sizes 1"–1¹⁄₂" use U5 Series (page 3.2)
The RIS Series Inlet Silencer is a heavy-duty, all-welded unit offering premium attenuation. Silencers are constructed of carbon steel, designed to provide long service life. The RIS Series is designed for pulse control and silencing for most Critical PLV Applications.
Silencers are designed for either vertical or horizontal mounting. A low side outlet version is designated RISY Series. Both the RIS and RISY Series Silencers have the same performance characteristics.
P
N
N
L H D
K
Y
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
*Specify -TT for male pipe threaded units.
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
RIS Series RISY Series(Low Side Outlet)
Silencers with connection sizes of 3-1/2” and smaller are offered with MaleNPT Threaded connections. Silencerwith connection sizes of 4 and 5” areavailable with either NPT male threads,or flanges. Silencer connections of 6”and above are equipped with 125/150ANSI Drilled Plate Flanges. Exteriorsurfaces are coated with a rustinhibitive primer, and may be finishcoated in the field if required. Othercoating options are available uponrequest. Brackets and other mountingoptions are also available.
**
For inlet sizes below 2” please refer to the U5 Series.For connection sizes above 16” please contact B&W Universal for price and availability.
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SpecificationsUCD Group
Chamber TypeDischarge Silencer
The UCD Series Discharge Silencer is a heavy duty, all welded unit offering standard attenuation. Silencers are constructed of carbon steel, providing long service life. The UCD Series is designed for pulse control and silencing for most Sub Critical PLV Applications. For Premium Grade Silencing, please refer to the URD Series.
The UCD Series is the basic End-in, End-out configuration. A low side inlet version is offered as the UCDY Series. Silencers are designed for either vertical or horizontal mounting. Silencers with connection sizes of 8” and above are equipped with 125/150 ANSI drilled plate flanges.
PartNumber D L N H K
56-108-AA56-110-AA56-112-AA56-114-AA
22263030
61748799
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
54678092
14¹⁄₂
16¹⁄₂
18¹⁄₂
18¹⁄₂
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214
Min
91112¹⁄₂
13¹⁄₂
Max
Y
21273440
Weight
250360550650
Chamber Type Discharge Silencers
DrainP
N
N
L H D
K
Y
Sizes 1"–6" use URB Series (page 2.7)
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
UCD Series UCDY Series(Low Side Inlet)
Exterior surfaces are coated with rust inhibitive primer, and may be finish coated in the field if required. Additional coating options are available upon request. Brackets and other mounting options are also available.
For connection sizes below 8” please refer to the URB Series.For connection sizes above 14” please contact B&W Universal for price and availability.
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SpecificationsURB GroupURD GroupChamber TypeDischarge Silencer
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
*Specify -TT for male pipe threaded units.
PartNumber D L N H
55-101-AA55-115-AA55-102-AA55-125-AA55-103-AA55-135-AA55-104-AA55-105-AA55-106-AA55-108-AA55-110-AA55-112-AA55-114-AA
4¹⁄₂
6¹⁄₂
810101214161822263036
21243334465253657297
122135161
2233333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
17202728404647596690
115128154
——7889
10111214¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
——
66¹⁄₂
89
1112¹⁄₂
14¹⁄₂
——
2229324863¹⁄₂
6981
—————————82
106117¹⁄₂
141
—————————6276¹⁄₂
88107
——————89
10121415¹⁄₂
17¹⁄₂
K
Min
URBY, URDY URDH URDS
Y
Max Min Max Min Max
Weight
——————
1619222940¹⁄₂
4249
10152030405570
120160370550800
1,250
Chamber Type Discharge Silencers
The URB/URD Series Discharge Silencer is a heavy duty, all welded unit offering premium attenuation. Silencers are constructed of carbon steel, providing long service life. The URB/URD Series is designed for pulse control and silencing for most subcritical PLV applications.
The URB/URD Series is the basic end-in, end-out configuration. A low side inlet (URBY/URDY), high side inlet (URDH), and opposed connections (URDS) versions are available providing added mounting and piping flexibility. Silencers are designed for either vertical or horizontal mounting. Silencers with connection sizes of 8” and above are equipped with 125/150 ANSI drilled plate flanges.
P
N
N
L H D
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214
K
Y
K
Y
K
Y
K
Note: Connection sizes of 1” – 6” are designated as URB Series. Sizes 8” and larger are designated as URD Series. Both the URB and URD Series are fundamentally the same in design and the performance characteristics are identical.
FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 8
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
URB,URD Series
URBY,URDY Series(Low Side Inlet)
URDH Series(High Side Inlet)
URDS Series(Opposed Connections)
Connection sizes of 3-1/2” and smaller are offered with male NPT pipe threads. Connection sizes of 4” and 5” are available with either male NPT thread or 125/150 ANSI drilled plate flanges. Exterior surfaces are coated with rust inhibitive primer, and may be finish coated in the field if required. Other coating options are available upon request. Brackets and other mounting options are also available.
**
For connection sizes above 14” please contact B&W Universal for price and availability.
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Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
*Specify -TT for male pipe threaded units.
SpecificationsSD Group
Combination Chamber-Absorptive Type
Discharge Silencer
The SD Series Discharge Silencer is a heavy duty, all welded unit offering standard attenuation. Silencers are constructed of carbon steel, designed to provide long service life. The SD Series is designed for pulse control and silencing for most critical PLV applications. For the most demanding pulse applications, the RD group of silencers may be required.
Silencers are designed for either vertical or horizontal mounting. Designs will allow for low or high side inlets for mounting flexibility. A low side inlet version is designated SDY Series. The high side inlet configuration is designated as SDH Series. The opposed connection version is designated as the SDS Series. All versions have the identical performance characteristics.
DrainP
N
N
L H D
K
Y
E
K
Y
KB
Y
Acoustical packing is suitable for 325˚F
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214
Part Number
54-102-AA54-125-AA54-103-AA54-135-AA54-104-AA*54-105-AA*54-106-AA54-108-AA54-110-AA54-112-AA54-114-AA
D
888
1010121418222630
L
28¹⁄₂
333939¹⁄₂
4557¹⁄₂
64728598
111
N
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
H
22¹⁄₂
273333¹⁄₂
3951¹⁄₂
58657891
104
K
8¹⁄₂
9101112¹⁄₂
15¹⁄₂
1721¹⁄₂
25¹⁄₂
29¹⁄₂
30
————
14¹⁄₂
17¹⁄₂
2026¹⁄₂
32¹⁄₂
3840
SDY SDH SDS
————
14¹⁄₂
17¹⁄₂
2026¹⁄₂
32¹⁄₂
3840
B
————89
1012¹⁄₂
14¹⁄₂
16¹⁄₂
18¹⁄₂
E
————2¹⁄₄
2³⁄₄
3¹⁄₄
4567¹⁄₂
Min
SDY
Min
————7¹⁄₂
99
1213¹⁄₂
1516¹⁄₂
Max
Max
————16¹⁄₂
2325¹⁄₂
30¹⁄₂
374450
Min
SDS
Min
————7¹⁄₂
9101213¹⁄₂
1516¹⁄₂
Max
Max
————9¹⁄₂
12¹⁄₂
15¹⁄₂
16¹⁄₂
182425
Min
SDH
Min
————30¹⁄₂
4043¹⁄₂
49¹⁄₂
61¹⁄₂
6981
Max
Max
————32¹⁄₂
43¹⁄₂
495465¹⁄₂
7789¹⁄₂
Weight
152530405080
110190380550800
Y
Combination Chamber-Absorptive Type Discharge Silencers
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
SD Series SDY Series(Low Side Inlet)
SDH Series(High Side Inlet)
SDS Series(Opposed Connection)
Silencers with connection sizes of 2” to 3-1/2” are offered with male NPTthreaded connections. Silencers withconnection sizes of 4” and 5” areavailable with either NPT male threads,or drilled plate flanges. Silencerconnections of 6” and above areoffered with 125/150 ANSI drilled plateflanges. Exterior surfaces are coatedwith a rust inhibitive primer, and maybe finish coated in the field if required.Other coating options are availableupon request. Brackets and othermounting options are also available.
Sizes 1" and 1¹⁄₂" use URB Series (page 2.7)
For silencers with connection sizes from 1” through 2” use the URB Series.For silencers with connections larger than 14” please contact B&W Universal for price and availability.
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Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
*Specify -TT for male pipe threaded units.
SpecificationsRD GroupCombination Chamber-Absorptive TypeDischarge Silencer
The RD Series Discharge Silencer is a heavy duty, all welded unit offering premium attenuation. Silencers are constructed of carbon steel, designed to provide long service life. The RD Series is designed for maximum pulse control and silencing for the most demanding Critical PLV Applications.
Silencers are designed for either vertical or horizontal mounting. Designs will allow for low or high side inlets for mounting flexibility. A low side inlet version is designated as “RDY” Series, and the high side inlet configuration is designated as “RDH” Series. The opposed connection version is designated as the “RDS” Series. All versions have identical performance characteristics.
DrainP
N
N
L H D
K
Y
E
K
Y
KB
Y
Combination Chamber-Absorptive Type Discharge Silencers
Acoustical packing is suitable for 325˚F
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
RD Series RDY Series(Low Side Inlet)
RDH Series(High Side Inlet)
Silencers with connection sizes of 3-1/2” and smaller are offered with male NPT threaded connections. Silencers with connection sizes of 4” and 5” are available with either NPT male threads, or flanges. Silencer connections of 6” and above are provided with 125/150 ANSI Drilled Plate Flanges. Exterior surfaces are coated with rust inhibitive primer, and may be finish coated in the field if required. Other coating options are available upon request. Brackets and other mounting options are also available.
RDS Series(Opposed Connection)
P(Size)
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214
Part Number
57-102-AA57-125-AA57-103-AA57-135-AA57-104-AA*57-105-AA*57-106-AA57-108-AA57-110-AA57-112-AA57-114-AA
D
810101214161822263036
L
3334435253657297
122135161
N
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
H
2728404647596690
115128154
K
910101114¹⁄₂
16¹⁄₂
20¹⁄₂
24¹⁄₂
28¹⁄₂
3540¹⁄₂
————
161822¹⁄₂
28¹⁄₂
344247¹⁄₂
RDY RDH RDS
————
14¹⁄₂
16¹⁄₂
20¹⁄₂
263239¹⁄₂
45¹⁄₂
B
————
10111214¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
E
————44¹⁄₂
5678
10¹⁄₂
RDY
Min
89
10121415¹⁄₂
17¹⁄₂
Max
2026¹⁄₂
304560¹⁄₂
6678
RDS
Min
————89
10121415¹⁄₂
17¹⁄₂
Max
————
1416¹⁄₂
202637¹⁄₂
3946
RDH
Min
————3343¹⁄₂
466579¹⁄₂
91110
Max
————39515679
103114¹⁄₂
138
Weight
2535406080
130160410600900
1,400
Sizes 1"–1¹⁄₂" use URB Series (page 2.7) or use U5 Series: (page 3.2)
FIXED AT 6FIXED AT 7FIXED AT 7FIXED AT 8
For connection sizes below 2” please refer to the URB Series Silencers.For connection sizes above 14” please contact B&W Universal for price and availability.
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2
SURS Series blower silencers are heavy duty, all welded steel construction, suitable for either inlet or discharge applications. The SURS series is designed for application to blowers operating above critical transition speed. As a result, there is no acoustical packing in these silencers. These silencers incorporate a unique high performance, three chamber system which utilizes a diffuser on the blower side of the silencer. The SURS Series provides excellent pulse control, and is designed for the most demanding conditions.
Connection sizes smaller than 4" are provided with standard NPT male pipe nipples. Silencers with connection sizes of 4" and larger have 125/150 ANSI drilled plate flanges.
The SURS is a basic end-in, end-out configuration. A low side inlet version is available as the SURSY Series. Both the SURS and SURSY versions are similar in gas flow path offering identical performance.
DrainP
N
N
L H D
K
Y
SURS Series SURSY Series(Low Side Inlet)
The SURS and SURSY Series silencers come with a high heat aluminum paint system. Other paint systems are available upon request.
Model
SURS SURSY
Part Model Part
YP D L N H
K Min. Max Weight
SURS-2SURS-2.5SURS-3SURS-3.5SURS-4SURS-5SURS-6SURS-8SURS-10SURS-12SURS-14
55-A02-SS55-A25-SS55-A03-SS55-A35-SS55-A04-SS*55-A05-SS*55-A06-SS55-A08-SS55-A10-SS55-A12-SS55-A14-SS
SURSY-2SURSY-2.5SURSY-3SURSY-3.5SURSY-4SURSY-5SURSY-6SURSY-8SURSY-10SURSY-12SURSY-14
55-B02-SS55-B25-SS55-B03-SS55-B35-SS55-B04-SS*55-B05-SS*55-B06-SS55-B08-SS55-B10-SS55-B12-SS55-B14-SS
22¹⁄₂
33¹⁄₂
4568
101214
1212121414*16*1826303636
40404659597172
111136138168
33333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
34344053536566
104129131161
999
1010111216¹⁄₂
18¹⁄₂
21¹⁄₂
21¹⁄₂
4¹⁄₂
4¹⁄₂
55¹⁄₂
678
10121416
1313152020252541515063
55556090
100160200520810
1,1301,400
SpecificationsSURS Group
Chamber Type Multi-Use Silencer
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
Combination Chamber Type Multi-Use Discharge Silencers
*Specify -TT for male pipe threaded units.
For silencer connections above 14" please contact B&W Universal for price and availability.
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Accessories andOptional FeaturesUCI, RIS, ICD IRB, IRD, SD, RD,and SURS Blower Silencers
In addition to the standard accessories shown here, other special features such as special materials and finishes will be quoted on request. Contact B&W Universal with your specific requirements.
Mounting BracketsMounting Brackets or legs are available for any of the silencers in this section.Saddle type brackets for horizontal mountand angle legs for vertical mount arestandard. See Spec. Sheet No. 1078. Special design brackets will be quoted withyour specifications.
Inspection OpeningsInspection Openings with bolted andgasketed cover plates are available installedat the time the silencer is fabricated. Theyare designed to withstand the usual range ofpressure encountered with blowers. Oneinspection opening is usually installed ineach silencer chamber for cleaning orinspection. Standard sizes include:3"" 4", 4"" 6", 6"" 8".
Pressure Vessel ConstructionAll silencers shown in this catalog may befabricated in accordance with Div. 1,Section VIII—ASME Code for UnfiredPressure Vessels. Dimensions are similarto standard models, but material types andthicknesses are selected to meet coderequirements. Prices are quoted onapplication to meet your pressure andtemperature conditions.
Oversize FlangesFrequently the blower flange size is largerthan the required silencer’s connection.Rather than use a larger silencer, it isusually more economical to use an oversizereducing flange on the silencer. This is theconventional piping practice and may beused on either inlet or discharge silencers.Example: a 10" flange size silencer hasadequate capacity for a blower with a 12"discharge flange. A flange having a drillingpattern to match the 12" blower flange butwith a 10" bore to match the silencer nozzleis substituted on the silencer inlet.
Two pipe sizes, (e.g. 10" to 14"), is therecommended maximum variation. Priceson request.
Horizontal Vertical
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CBF/CBFI SeriesCompact Blower
Inlet Filter-Silencer
Filter and silencer combined in one unit. The CBF and CBFI have the acoustic capabilities of the B&W Universal RIS Series silencers and the filtration performance of CC series filters.
Reduced cost, overall package size, weight, storage space, freight cost and damage.
Approximately one third the size of conventional blower silencer, with the added benefit of excellent, high-efficiency filtration.
Reduced overall package noise without further acoustic treatment.
Versatile—Suitable for inlet applications in confined areas, outdoor or indoor, without compromising acoustic or pressure drop performance.
70°F200°F300°F
L
WD
H
DP
K
Y
¹⁄₈" NPTpressure tap
Removable weatherhoodfor filter element access
Y
P
H
L
K
D
WDRemovable plate for filter element access
¹⁄₈" NPTpressure tap
CBF Series (outdoor use) CBFI Series (indoor use)
P (nom.)
CBF/CBFI
22¹⁄₂
34568
1012
D
88
12121616243034
89
1015172324¹⁄₂
35¹⁄₂
39¹⁄₂
44³⁄₄
5¹⁄₄
7¹⁄₂
8¹⁄₂
11¹⁄₂
13³⁄₄
17³⁄₄
19³⁄₄
7799
111115¹⁄₂
18¹⁄₂
20¹⁄₂
120175275500750
1,1002,2003,0004,300
34-702-AA34-725-AA34-703-AA34-704-AA34-705-AA34-706-AA34-708-AA34-710-AA34-712-AA
101016162020303640
13¹⁄₄
14³⁄₄
1721¹⁄₄
26323946¹⁄₂
54¹⁄₂
2025506085
100200305385
34-G02-AA34-G25-AA34-G03-AA34-G04-AA34-G05-AA34-G06-AA34-G08-AA34-G10-AA34-G12-AA
6¹⁄₂
6¹⁄₂
10101212121824
12³⁄₄
14¹⁄₄
16¹⁄₂
20³⁄₄
25¹⁄₄
31¹⁄₄
39¹⁄₄
45³⁄₄
53³⁄₄
2025506085
100185295370
H Y K CFM CAP Part
CBF
WD L Weight Part
CBFI
B L1 Weight
Models, Dimensions, Weights and Elements
Notes: 1. Non-ASME Code construction suitable for 15" Hg vacuum.2. Weights are approximate and do no include the weight of the filter element.
81-0471*81-0471*81-106381-106381-047581-047581-116381-116381-1164
81-1203*81-1203*81-120581-120581-120781-120781-120981-120981-1210
81-1036*81-1036*81-103881-103881-104081-104081-120081-120081-1201
Paper
22¹⁄₂
34568
1012
P (nom.)Element Part Number
Felt Wire
*Pair of elements required (stacked).
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2.12
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
DP
K
Y
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CB SeriesCompact Blower Silencer
Part Number P (nom.) D L H Y K Weight
56-702-AA56-725-AA56-703-AA56-704-AA56-705-AA56-706-AA56-708-AA56-710-AA56-712-AA
22¹⁄₂
34568
1012
88
12121616243034
1112¹⁄₂
13¹⁄₂
182026313943
89¹⁄₂
10¹⁄₂
15172327¹⁄₂
35¹⁄₂
39¹⁄₂
44³⁄₄
5¹⁄₄
7¹⁄₂
8¹⁄₂
11¹⁄₂
13³⁄₄
17³⁄₄
19³⁄₄
7799
111115¹⁄₂
18¹⁄₂
20¹⁄₂
152535457085
170275355
120187270480750
1,0801,9203,0004,320
Model
CB-2CB-2¹⁄₂
CB-3CB-4CB-5CB-6CB-8CB-10CB-12
CFM CAP
Compact Blower Silencers
Y
PHL
P
D
K
500 1K 1.5K 2K 2.5K 3K 3.5K 4K 4.5K 5K 5.5K0
1
2
3
4
5
6
7
Velocity, ft/min
!P, inches of H
2 O
Pressure Drop Curves
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
10
0
20
70°F200°F300°F
The B&W Universal CB Series of compact blower silencers are smaller in size when compared to other more conventional styles of blower silencers. The CB Series is used when space is at a premium. These silencers are designed to provide intake or discharge silencing on rotary positive blowers. On average, the CB Series Silencers are about 1/3 the size of conventional silencers, providing savings in cost and weight.
The CB Series silencers utilize an absorbent internal pack suitable for temperatures to 325 F, and pressures up to 15 psig. Flanged or threaded connections are available. Exterior surfaces receive a shop coat of corrosion inhibitive primer.
12
34
56
78
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UNI-BASEUltra-Wide Base
Plates/ComponentsRotary Positive Blowers
These wide base plate products accommodate a variety of blower package designs. The UNI-BASE package and the USI-BASE base plate use the same basic base plate and discharge silencer. The UNI-BASE package includes the B&W Universal model URBN high-side inlet silencer and CCF inlet air filter, while the UNI-BASE base
plate is only the basic plate and the URBYdischarge silencer. Please see page 2.7 forperformance and sizing information for theURBY series silencers, page 2.15 forinformation on the URBN series silencers,and page 8.9 for performance data, weightsand dimensions of CCF filters.
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45
67
82
2.14
UNI-BASE Package
UNI-BASE Base Plate Only
CCF (see page 8.9)
URBN (see page 2.15)
URBY (see page 2.7)
URBY (see page 2.7)
Size UNI-BASE Package
22¹⁄₂
3456
80-187380-187480-187580-187680-187780-1878
55-202-ABP55-225-ABP55-203-ABP55-204-ABP55-205-ABP55-206-ABP
55-502-AA55-525-AA55-503-AA55-504-AA55-505-AA55-506-AA
55-202-AA55-225-AA55-203-AA55-204-AA55-205-AA55-206-AA
34-L02-TT*34-L25-TT*34-L03-TT*34-L04-TT*34-L05-TT*34-L06-TT*
Base Plate Only URBN Only URBY Only CCF Only
UNI-BASE Base Plates/Components Part Numbers
*Specify “P” at end of part number for unit with pleated paper elements, “F” for pleated felt or “W” for wire mesh.Refer to page 8.11 for filter element details.
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UNI-BASEUltra-Wide BasePlates/ComponentsRotary Positive Blowers
P1/P2 (nom.) D1 H1 K1 Y1 Y2 Approx. Weight
22¹⁄₂
3456
81010141618
272840476066
788
101112
677668
3¹⁄₂
4¹⁄₂
4¹⁄₂
5¹⁄₂
6¹⁄₂
7¹⁄₂
25355080
140170
URBN Silencers
CCF Silencers (please see page 8.9)
P (nom.) A B C CD D2 E FS
2
3456
3944¹⁄₂
55¹⁄₂
566666
1¹⁄₂
1¹⁄₂
4———
20³⁄₄
2131¹⁄₂
37¹⁄₂
43¹⁄₂
52
10³⁄₄
11¹⁄₄
1215¹⁄₂
18¹⁄₄
18¹⁄₄
81010141618
6¹⁄₂
6³⁄₄
7¹⁄₂
813³⁄₄
10¹⁄₂
1314¹⁄₄
15¹⁄₄
16¹⁄₂
14³⁄₄
15¹⁄₄
23¹⁄₂
27¹⁄₂
29³⁄₄
333535¹⁄₄
16171724¹⁄₂
23¹⁄₂
26¹⁄₂
56689
10¹⁄₄
788
101112
3031435062¹⁄₂
69
3¹⁄₂
44³⁄₄
61112
212526¹⁄₄
29³⁄₄
30¹⁄₂
30¹⁄₂
677
111212
125170270355500645
G H2 J K2 L Q (Dia.) S YApprox.Weight
UNI-BASE Base Plate (w/URBY)
Dimensions and Weights
Notes: 1. Sizes 2"–3" URBY discharge silencers are shipped standard with male pipe threaded connections. 4" and 5" URBY discharge silencers are shipped standard with malepipe threaded discharge connections and plain pipe blower connections. 6" URBY discharge silencers are shipped standard with flanged discharge connection drilledto 125/152 lb. ANSI specifications and plain pipe blower connections.
2. Sizes 2"–3" URBY discharge silencers have a 2" NPT relief valve coupling and plug. Sizes 4"–6" URBY discharge silencers have a 3" NPT relief valve coupling and plug.3. UNI-BASE base plate kit sizes 2"–4" require gussets.
Notes: 1. Sizes 2"–4" URBN inlet silencers are shipped with male pipe threaded inlets and plain pipe outlets. Sizes 5" and 6" URBN inlet silencers are shipped standard withflanged inlet connections drilled to 125/150 lb ANSI specifications and plain pipe outlets.
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23
45
67
8
2¹⁄₂
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3.1
U5 SeriesPremium grade straight-through silencer available in pipe sizes of ½" to 6". Attenuation is similar to the SUS Series.
U2 SeriesStandard grade straight-through silencer available in pipe sizes 5" to 16". For better performance use SUS, SU4, or SU3 series.
SU5 SeriesPremium grade full-flow annular type silencer available in pipe sizes of 4" to 30".
SU3 SeriesStandard grade annular type silencer with performance one grade below the SUS Series. The SU3 Series is available in pipe sizes 8" to 30". For enhanced performance, use SU4 or SUS series.
Sizing Information, Pressure Drop DataThe flow area through the silencer must be sufficient to accommodate the maximum flow without imposing excessive pressure drop. The following instructions enable the selection of the proper silencer size and determination of actual pressure drop. These instructions assume air as the flowing gas. For other gases, density and other corrections may be necessary—contact B&W Universal for assistance.
Data required:air flow rate (actual CFM)temperature (°F)pressure (psig)maximum pressure drop (inches of water)
2
1 Determine maximum velocity.
V = air or gas velocity, ft/min (see note 1)
!P = maximum pressure drop, inches of water
c = silencer pressure drop coefficient(see Table 1)
T = air temperature, °F (see note 2)P = operating pressure, psig
(If at atmospheric pressure, pressure ratio is unity and may be omitted from equation. If P exceeds 15 psig, contact B&W Universal for recommendations.)
2 Determine flow area required.
A = flow area required, ft2
Q = air flow rate (actual CFM)
3 From Table 2, select size with flow areaequal to or greater than that calculated.
4 Determine actual gas velocity in ft/min.
A = flow area from Table 2
5 Determine actual pressure drop.
c =silencer pressure drop coefficient (see Table 1)
V ! 4005!"""""""# $# $# $14.7P " 14.7
!Pc
T " 460530
QVA !
# $ # $ # $530T " 460
P " 14.714.7
V actual4005
!P ! c
U5, U2SU5SU3, SU4
.25
.75
.85
Silencer Series Pressure DropCoefficient (C)
Pressure Drop Coefficients1
0.00140.00310.00550.0120.0220.0340.0490.0670.0870.1360.1960.3490.550.791.071.41.82.2
¹⁄₂
³⁄₄
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
101214161820
2.63.13.74.34.95.66.37.17.98.79.6
10.611.512.615.919.623.828.3
222426283032343638404244464854606672
DiameterSize (in)
DiameterSize (in)
Flow Area Size2
Notes
2. Typical attenuation curves indicate the characteristics of the silencer series and are neither a minimum nor a guarantee for an individual silencer. Individual silencer performance can be affected by sound source characteristics including pure tones, flow velocity, adjacent piping and temperature.
The absorptive type silencer is the classic dissipative design that absorbs noise energy by the use of various types of fibrous packing materials. As sound waves pass through the spaces between the tightly packed sound absorbent small diameter fibers, the resulting viscous friction dissipates the sound energy as small amounts of heat.
GeneralInformation
Absorptive Silencers
# $# $T " 460530
14.7P " 14.7Actual CFM ! (Standard CFM)
QAV actual !
Absorbent silencers are very effective on high frequency noise (500-8,000 Hz). At frequencies above and below this range, attenuation is somewhat diminished. Since noise is absorbed by the packing material, absorptive silencers do not rely on internal baffles, tubes, or chambers to achieve noise reduction. As a result absorptive silencers generally utilize a "straight-through" gas flow path that will minimize flow restriction.
B&W Universal Absorptive Series of silencers are listed below.
Flow Area(ft2)
Flow Area(ft2)
1. Since "self noise" and aerodynamic noise" increase with velocity, absorbent silencers are usually sized for 4,000 to 8,000 ft/min. In no case should the velocity exceed 15,000 ft/min. regardless of pressure drop allowed.
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PartModel
U5 SeriesStraight-ThroughAbsorptive Silencer
The U5 Series is a premium grade straight-through absorptive silencer which provides excellent noise attenuation due to its high length to diameter ratio. It is especially well suited for inlet applications on small rotary positive, centrifugal blowers, or discharge of vacuum pumps. The U5 Series consists of mild steel construction and enamel paint.
Common Applicationsrotary positive/centrifugal blowersvacuum pump dischargeair valves and cylinderssmall low-pressure ventshigh frequency noise sources
U5-¹⁄₂U5-³⁄₄U5-1U5-1¹⁄₄
U5-1¹⁄₂
U5-2U5-2¹⁄₂
U5-3U5-4U5-5U5-6
11-150-AA11-170-AA11-101-AA11-121-AA11-115-AA11-102-AA11-125-AA11-103-AA11-104-AA11-105-AA11-106-AA
¹⁄₂
³⁄₄
11¹⁄₄
1¹⁄₂
22¹⁄₂
3456
3¹⁄₄
3¹⁄₄
3¹⁄₄
3¹⁄₄
4¹⁄₄
5¹⁄₈
6¹⁄₈
6⁵⁄₈
81012
811141619³⁄₄
2633¹⁄₂
36¹⁄₂
48⁷⁄₈
5763
————¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₈
33
811141618⁷⁄₈
2532¹⁄₂
35¹⁄₂
48³⁄₄
5157
23346
1015204060
100
P D L N H Weight
4045
63 125 250 500 1K 2K 4K 8K
105
15
0
20253035
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
NoteU5 series standard paint and acousticalpacking are suitable for 325°F.
N N
P P
HL
D
Absorptive Material
Straight-Through Absorptive Silencer
Sizes ½" through 1-1/4" are constructed with one-piece tapped heads. The tapped opening is approximately flush with the end of the shell.Sizes ½" through 4" utilize female NPT pipe connections.Sizes 5" and 6" utilize 125/150 ANSI drilled plate flanges.
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U2 SeriesStraight-Through
Absorptive Silencer
The U2 Series is an intermediate grade straight-through absorptive silencer. The U2 Series utilizes a lower length to diameter ratio. The U2 Series consists of mild steel construction with primer coated exterior.
Common Applicationsintermediate size rotary positive blower inletcentrifugal blower inlet or discharge intermediate size dry vacuum pump dischargegas turbine inlethigh-speed centrifugal compressor inlethigh frequency noise sources
PartModel
U2-5U2-6U2-8U2-10U2-12U2-14U2-16
10-105-AA10-106-AA10-108-AA10-110-AA10-112-AA10-114-AA10-116-AA
568
10121416
10121416182022
364053657789
101
333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
30344658708294
4570
105160220340440
P D L N H Weight
4045
63 125 250 500 1K 2K 4K 8K
105
15
0
20253035
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
Note:U2 series standard paint and acousticalpacking are suitable for 325°F.
N NHL
DP P
Absorptive Material
Straight-Through Absorptive Silencer
For inlet sizes above 16" please contact B&W Universal for price and availability.
Sizes ½" through 1-1/4" are constructed with one-piece tapped heads. The tapped opening is approximately flush with the end of the shell.Sizes ½" through 4" utilize female NPT pipe connections.Sizes 5" and 6" utilize 125/150 ANSI drilled plate flanges.
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SU SeriesAnnular FlowAbsorptive Silencer
SU5 SeriesThe SU5 Series is a premium grade annular flow absorptive silencer. The design consists of two concentric perforated cylinders lined with acoustical packing. The two concentric cylinders form an annular flow path with blocked line of site to provide full flow area for low resistance. The SU Series comes standard with carbon steel construction and primer coated exterior.
SU3 SeriesThe SU3 Series is a standard grade annular flow absorptive silencer. The design consists of two concentric perforated cylinders lined with acoustical packing. The two concentric cylinders form an annular flow path with partial blocked line of site to provide full flow area for low resistance. The SU3 Series comes standard with carbon steel construction and primer coated exterior.
Common ApplicationsInlet and discharge of high speed low pressure centrifugal compressors and blowers less than 15 psig
Industrial fan inlet and discharge
High pressure centrifugal compressors inlet
Gas turbine inlet
Dry vacuum pump discharge
Some low pressure vents less than 15 psig
High frequency noise sources
Inlet of turbocharged reciprocating engines
Note:SU Series standard paint and acousticalpacking are suitable for 325°F.
N NHL
DP
All sizes furnished with flanged connections to match 125#/150# ANSI drilling.
P
Absorptive Material
SU3 and SU5 Series silencers are available in sizes from 4" through 30" inlets. For sizes larger than 30" please contact B&W Universal for price and availability.
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SU SeriesAnnular Flow
Absorptive Silencer
Model Part P D L N H Weight
SU5-4SU5-5SU5-6SU5-8SU5-10SU5-12SU5-14SU5-16SU5-18SU5-20SU5-22SU5-24SU5-26SU5-28SU5-30SU3-8SU3-10SU3-12SU3-14SU3-16SU3-18SU3-20SU3-22SU3-24SU3-26SU3-28SU3-30
14-104-AA14-105-AA14-106-AA14-108-AA14-110-AA14-112-AA14-114-AA14-116-AA14-118-AA14-120-AA14-122-AA14-124-AA14-126-AA14-128-AA14-130-AA12-108-AA12-110-AA12-112-AA12-114-AA12-116-AA12-118-AA12-120-AA12-122-AA12-124-AA12-126-AA12-128-AA12-130-AA
4568
10121416182022242628308
1012141618202224262830
101212182024262830363642424848141618202224262830303636
21¹⁄₂
26263644¹⁄₂
5361¹⁄₂
6874788991
10210411531353939474749¹⁄₂
55¹⁄₂
55¹⁄₂
6163¹⁄₂
62
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
15¹⁄₂
20202937¹⁄₂
4654¹⁄₂
61676980829395
10624283232404040¹⁄₂
46¹⁄₂
46¹⁄₂
5254¹⁄₂
53
305560
120195290390500650950
1,0801,4001,5802,2002,600
85120155200270290350420500680830890
SU5
SU3
Typical Attenuation CurveSU5 Series
Typical Attenuation CurveSU3 Series
4045
63 125 250 500 1K 2K 4K 8K
105
15
0
20253035
Octave Band Center Frequency, Hz
Atte
nuat
ion,
dB
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HV SeriesCombination Vent Silencers
Versatile SilencersB&W Universal HV Series vent silencers effectively silence high velocity air, steam, gas vents, and blowdown to atmosphere where sonic, or critical conditions exist in the valve. Typical applications include:
Steam boiler relief valvesSuperheater header relief valvesBoiler startup and purgeHigh pressure air vents Natural gas blowdowns Switch valvesCompressor blowoffsAutoclavesSteam ejectors
Standard FeaturesInlet plenum are covered with outer acoustic wrap and lag shell to reduce outer mechanically induced shell noise, and internal flow noise.
Highly absorptive mineral wool acoustic fill material, and heavy gauge perforated face sheets for exceptional attenuation at high frequencies.
Inlet nozzle and diffuser with flanged connections are provided with 150# ANSI drilled plate flanges. Other styles of inlet connections can be provided to meet application requirements.Lifting lugs provided for simple installation.
A bottom drain is provided to reduce or eliminate water entrainment.
Silencers provided with standard high heat aluminum paint. Alternate surface preparation and exterior coatings can be provided to meet specific requirements.
Silencers can be provided for either vertical or horizontal applications.
Optional Features
Construction options using alternate materials, such as stainless steel, Monel, or other types can be provided to meet special application requirements.
Mounting brackets and other special supports to provide ease of installation.
Outlet heads and nozzles can be provided for in-line applications.
Restrictive diffusers built to ASME Section VIII Division 1, designed, to maintain back pressure or control blowdown time.
Elbows, tailpipes and weather hoods are available.
Special paints
Side inlets available.
A Complete SolutionUniversal AET’s extensive in-houseengineering, manufacturing, and testingfacilities ensure an optimized process,mechanical and acoustic solution for anyapplication.
The concentric annular ring design (left) and the wrapped Acousti-Tube vent silencer design (right) offer a choice of silencer profile and configuration to meet site-specific requirements.
Annular Ring Acousti-Tube™
High-EfficiencyAcoustic Pack
Designed forOptimum SpaceConsiderations
All-Welded SteelOuter Shell
Pack Retention with Pre-Compression
Lower ChamberInsulation
(Except HV5 and HV10)
Inlet Diffuser,Depending on
Application
Easy To Specify and OrderVent and blowdown silencers are rarely a simple catalog selection. For each application, detailed specifications and system description are required for B&W Universal to provide a custom solution.
By providing either a valve manufacturer's specification sheet, or a vent silencer application sheet, our experienced sales and application engineering staff can provide a silencer that will be best suited to meet your application requirements.
A Complete SolutionB&W Universal's extensive in-house engineering, testing and manufacturing facilities with optimized processes will provide both mechanical and acoustic solutions for any application.
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MethodologyVent Silencers
The B&W Universal HV Series of vent and blowdown silencers come with an outlet diffuser or orifice plate that is a critical element to the acoustic and mechanical performance. Both the inlet nozzle and the diffuser/orifice are designed and constructed to withstand thermal and impact stresses produced in high pressure, high temperature, continuous or intermittent blowdown service.
In vent applications, critical flow will occur for most gases at valve upstream pressures greater than twice the outlet pressure. Vent and blowdown noise levels increase with increased pressure drop and are also affected by valve aerodynamic recovery characteristics. Large valve, low pressure vents will produce relatively broadband frequency noise, while high pressure vents with smaller valves will produce high frequency noise.
Subsonic (or non-critical flow) low pressure vent and blowdown applications may not require an inlet diffuser. Contact B&W Universal for silencer recommendations when a combination of both low pressure drop and acoustic requirements must be met.
The HV Series is offered in six standard acoustical ratings, ranging from 15 to 70 dB. The HV05 is offered for applications where only minimum noise reduction is required. The HV30 is offered for applications where maximum silencing is required. Acoustic ratings are offered in sizes that cover a wide range of gas flows.
HV20 and HV30 acoustic ratings are offered for standard pipe diameters from 2” up to 112”. All other acoustic ratings are offered for standard pipe diameters of 12” to 112”.
Application AnalysisThe following application data is used for vent silencer selection.
Type of gas:Molecular weight or specific gravity of the gasRation of specific heatsFlow rate (lb/hr, ACFM or SCFM)Pressure and temperature upstream of valve and silencerMaximum allowable pressure drop (psi) for valve and silencerManufacturer's name, valve type and size (if available)Un-silenced noise from valve during operating conditions (if available)Silenced noise level (at distance from source)Silencer inlet size and pressure rating Inlet orientation (end inlet, or side inlet)Piping arrangement (include schematic if available)Other required options
Note:Form 88-0063 is available to record this and other information. Using this information, B&W Universal will prepare a computer analysis and a comprehensive technical proposal along with a price quotation. Silencer selection is based upon optimization of flow velocity, required acoustical performance, and pressure drop.
HV05
Series
HV10HV15HV20HV25HV30
Industrial
Classification
CommercialSuburbanResidential
HospitalCritical
15–20
AverageDynamic
Insertion Loss(dBA)
20–3030–4040–5050–6060–70
Silencer Ratings1 by Grade Classification
B&W Universal is skilled in the application of process engineering principles that are needed to meet your application requirements. A key element of a successful vent application is establishing pressure drop in the piping, valve and vent silencer. Valve performance and life can be extended by appropriate distribution of pressure drop in the complete system. In many cases it is possible to reduce the pressure drop across the valve body to less than critical. This can potentially result in reduced valve actuator open/close force requirements. As a result, reduced valve wear caused by cavitation damage and reduced through-valve body noise are added benefits.
B&W Universal can verify the valve flow and pressure drop characteristics from any valve manufacturer's data sheet. B&W Universal offers a complete application engineering solution, including determination of blowdown time, bottled volume calculations, and complete valve, pipe treatment, and vent discharge acoustic performance predictions.
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Application NotesPipe size immediately downstream from a valve affects the noise spectrum octave band distribution. B&W Universal has developed proprietary methods to predict octave band distribution and accurately select the appropriate balance of reactive and absorptive elements in our vent silencer designs.
Annular vent silencers are assembled with structural members that accommodate thermal expansion in high temperature applications. The acoustic packing consists of long fiber mineral wool that is protected by fiberglass cloth and a perforated metal sheet. The sound-absorbent packing is filled under pressure, using compression rings to minimize voids and settling.
The HV Series of vent silencers are designed so the inlet flange and diffuser are matched to the discharge rating of the valve. Often, B&W Universal can create a more cost-effective valve and piping system by using a restrictive diffuser or an orifice plate to stage the system pressure drop. Vent silencers with restrictive diffusers are designed with pressure ratings that match the PSV inlet pressure rating. It is important to ensure that the control valve will not malfunction from the rated back pressure of the restrictive diffuser. Please review the valve manufacturers' data sheet.
Customers are encouraged to contact the Compressed Gas Association (CGA) for additional standards relating to preparation and cleaning for applications in pure oxygen service.
Construction FeaturesB&W Universal vent silencers are heavy duty units. The inlet nozzle and diffusers are constructed of steel and fully welded. The diffuser provides controlled pressure expansion to atmosphere and uniform flow distribution through the acoustic section of the silencer.
The lined vent silencer inlet plenum (expansion chamber) is designed with a double shell separated by a layer of acoustic insulation and sound deadening material. The inner shell is solid to prevent shell-radiated noise and the potential of migration of the acoustic packing. The transmission loss across the plenum and bottom head is comparable to the silencer attenuation.
ProductDescriptionVent Silencers
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Date:Project Name: Customer Contact: Contact Info:
Quote #:BDM:
ApplicationNoise source: Type of process:
Attached Valve Data SheetType of Gas: Pressure upstream of valve:
Molecular Weight: Temperature upstream of valve:Ratio of Specific Heats: Maximum flowrate:
Continuous Pressurized volume of piping:Intermittent Maximum allowable blowdown time:Occasional Final upstream pressure:
SPL PWL 31.5 63 125 250 500 1000 2000 4000 8000dB(A) dB(L)
If SPL, indicate distance and angle:
Inlet nozzle orientation: End in (axial) Side inInlet nozzle diameter: Flanged, pressure class:
Male NPT Beveled weld endSilencer orientation: Vertical Horizontal
Max allowable diameter: Max allowable length:Outlet orientation: Vertical, unless otherwise specified:Silencer supports: Shell lugs Legs
Skirt & base ring Horizontal saddlesNozzle Other:
Materials, shell: Carbon steel, unless otherwise specified:Materials, internals: Carbon steel, unless otherwise specified:
Finish:
Acoustics Silenced Sound Level: dB(A) At Distance/Angle:
Pressure Drop Maximum allowable pressure drop:
Additional Commentsor
Other Requirements
Blast per SSPC SP6, inorganic zinc primer, high heat topcoat external only unless otherwise specified:
Silencer Requirements
Silencer Design/Dimensional Information (Attach drawing or sketch if available)
VENT SILENCER REQUIREMENTS
General Information
Gas Data (Attach valve spec. sheet if available)
Customer/Location:
EWR #:Engineer:
Yellow highlight denotes required fields.
Timed blowdown applications only:Type of service
Octave Band Center Frequency (Hz)Unsilenced Sound Data, if available
Performance Requirements (Complete all Applicable Sections)
Form 88‐0063_R7 27Apr2017
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GeneralInformation
Industrial Fan Silencers
Primary air fans, forced draft fans and induced draft fans generally require some form of acoustical treatment. Most applications require inlet and/or outlet silencers to meet OSHA and other noise requirements. For continuous exposure, a maximum of 90 dBA is generally specified to avoid hearing damage. When conversation near the fan is desired, levels of 80 dBA and less are often needed.
B&W Universal designs and manufactures a complete line of silencers for application on all fan types. Computer enhanced technology developed for fan, turbine, and other air moving equipment enables B&W Universal to offer a cost-effective solution for every fan silencing application.
Each of the four designss in this section has unique advantages over the others, depending upon the application, pressure drop and space utilization. This catalog covers standard models and sizes and provides basic information to evaluate the merits of the individual designs for your application. Special configurations, materials, higher temperatures, and sizes are available upon request.
AFS Series Absorptive/Reactive SilencerThe AFS series fan silencer combines a reactive and absorptive chamber design that both reflects acoustic energy and dissipates it with absorptive pack material. Constructed from plate and sheet steel in an all-welded, straight-through flow path design, the AFS series is suitable for most applications on the inlet and discharge of centrifugal or axial blowers, especially when low pressure drop is required. The standard AFS silencer is suitable for temperatures up to 325°F.
Acousti-VaneAbsorptive/Parallel Baffle SilencerThe Acousti-Vane silencer comes instandard cross-sections and lengths thatcover a wide range of applications andprovide economical solutions to a broadrange of noise conditions. Standard unitscan be adapted for use in non-standard orapplication-specific configurations.
The Acousti-Vane is available in threestandard models:
LPThe low-pressure drop Acousti-Vane haslower pressure drop than the other twomodels and is the most economical of thethree. The LP is the silencer of choice whenpressure drop is critical and a relatively smallamount of noise attentuation is needed.
MPThe moderate pressure-drop Acousti-Vaneoffers greater acoustic performance thanthe LP at a slightly higher pressure drop.The MP models meets most noiseattenuation specifications.
HPThe high-performance Acousti-Vaneprovides maximum acoustic performance ata higher pressure drop than the LP or MP.The HP models is ideal for the mostdemanding acoustical environment.
The steel frame of the Acousti-Vanesilencers has high sound transmission loss.The standard shell finish includes solvent-cleaning by SSPC-SP-1, shop coat primerinside and outside, and a blue enamelcoating outside. The paint systemwithstands internal gas and skintemperatures up to 200ºF. Optional paintsystems are available.
Acousti-TubeAbsorptive/Tubular Flow SilencerThe modular, compact, lightweight Acousti-Tube silencer knocks out high-frequencynoise while minimizing pressure drop.
The Acousti-Tube silencer is available instandard cross-sections and lengths, whichcover a wide range of product applicationsand are economical solutions to noiseproblems. The silencer’s modular designallows customization for non-standardconfigurations without any loss of acousticperformance or increased pressure loss.
Composite materials are used in theflowpath to reduce corrosion andmaintenance. The lightweight, easy-to-handle design reduces shipping cost andinstallation time. The Acousti-Tube modulesare factory-assembled in a high-transmission-loss steel frame. The framehas a standard high-performance, two coatpaint system on interior and exteriorsurfaces suitable for outdoor installations.
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SizingInformationIndustrial Fan Silencers
In order to properly size a fan silencer, the flow area through it must be sufficient to accommodate the maximum flow without imposing excessive pressure drop. The following instructions enable you to select the proper silencer size and determine actual pressure drop. These instructions assume flowing gas is air. For other gases, density, and other corrections, contact B&W Universal for assistance.
Data required:air flow rate (actual CFM)temperature (°F)pressure (psig)maximum pressure drop (inches of water)
QV
A required !
! "! "T " 460530
14.7P " 14.7Actual CFM ! (Standard CFM)
1 Determine the maximum velocity toachieve the required pressure drop.
V = air or gas velocity, ft/min (see Note 1)
!P = maximum pressure drop, inches of water
c = silencer pressure drop coefficient(see page 5.5)
T = air temperature, °F (see Note 2)P = operating pressure, psig
(if at atmospheric pressure, pressure ratio is unity and may be omitted from equation; if P exceeds 15 psig, contact B&W Universal for recommendations)
2 Determine flow area required.
A required = flow area required, ft2
Q = air flow rate (actual CFM)
For reference, if SCFM is given ratherthan ACFM, then convert using thefollowing equation.
3 From Table 1 or the tables on page 5.5select a size with a flow area equal toor greater than that calculated in step 2.
4 Determine the actual gas velocity infeet per minute.
A = flow area of size of silencer chosen, ft2
5 Determine actual pressure drop ininches of water.
QA
V actual !
0.0870.1360.1960.3490.5500.7901.0701.4001.8002.2002.6003.1003.7004.3004.9005.6006.3007.1007.9008.7009.600
10.60011.50012.60015.90019.600
4568
10121416182022242628303234363840424446485460
Flow Area(ft2)
Diameter(in)
Conversion—Pipe Diameterfrom Flow Area1
Notes1 Since self noise and aerodynamic noise
generation increase with velocity,absorptive silencers are usually sized for4,000–8,000 ft/min. In no case shouldthe velocity exceed 15,000 ft/min,regardless of pressure drop allowed.
2 Typical attenuation curves indicate thecharacteristics of the silencer series andare neither a minimum nor a guaranteefor an individual silencer. Individualsilencer performance can be affected bysound source characteristics includingpure tones, flow velocity, adjacent piping,and temperature.
2
V ! 4005#$$$$$$$! "! "! "14.7P " 14.7
!Pc
T " 460530
! "! "! "530T " 460
P " 14.714.7
V actual4005
!P actual ! c
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AFS SeriesCombination Type Silencer
Featuresstraight-through flow pathcombination reactive and absorptivedesign for best mid-frequency attenuationlow-pressure droppressure drop coefficient, c = 0.6 for pipesizes < 24" and c = 1.0 for 24" and larger124/150# ANSI drilled plate flangesall-welded mild steel construction primer-coated exterior
Common Applicationscentrifugal blowers inlet and dischargeaxial blowers inlet and discharge industrial fans inlet and dischargecentrifugal compressors inlet small reciprocating compressors
6" pipe size12" pipe size24" pipe size
NoteAFS series standard paint and acousticalpacking are suitable for 325°F.
40
50
63 125 250 500 1K 2K 4K 8K
10
0
20
30
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
Model
AFS-4AFS- 5AFS-6AFS-8AFS-10AFS-12AFS-14AFS-16AFS-18AFS-20AFS-22AFS-24AFS-26AFS-28AFS-30AFS-32AFS-34AFS-36AFS-42AFS-48
Part
61-104-AA61-105-AA61-106-AA61-108-AA61-110-AA61-112-AA61-114-AA61-116-AA61-118-AA61-120-AA61-122-AA61-124-AA61-126-AA61-128-AA61-130-AA61-132-AA61-134-AA61-136-AA61-142-AA61-148-AA
P
4568
10121416182022242628303234364248
D
1214162024283636424848546060666666728496
L
3440¹⁄₂
4760¹⁄₂
67¹⁄₂
74¹⁄₂
89100¹⁄₂
108124129143157168¹⁄₂
182187¹⁄₂
193207220272
N
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
66
H
2834¹⁄₂
4153¹⁄₂
60¹⁄₂
67¹⁄₂
8293¹⁄₂
101115120134148159¹⁄₂
173178¹⁄₂
184198208260
Weight
6080
135220380500980
1,1501,4001,8001,9502,4503,6704,1004,8255,1005,4006,4009,500
15,000
Combination Type Silencer
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5.4
Acousti-VaneAbsorptive Parallel Baffle TypeRectangular Silencers
The Acousti-Vane silencer is designed as astand-alone silencer or in series with USI’sAcousti-Tube silencer. The superior noiseattenuation of the Acousti-Vane, combinedwith the superior high-frequency performanceof the Acousti-Tube, provides excellent noisecontrol over a broad spectrum.
The Acousti-Vane silencer comes instandard cross-sections and lengths thatcover a wide range of applications andprovide economical solutions to a broadrange of noise conditions. Standard unitscan be adapted for use in non-standard orapplication-specific configurations.
The Acousti-Vane is available in three standard models:
LPThe low-pressure drop Acousti-Vane hasthe lowest pressure drop and is the mosteconomical of the three.
MPThe moderate-pressure drop unit offersgreater acoustic performance than the LP ata slightly higher pressure drop and meetsmost noise attenuation specifications.
HPThe high-performance Acousti-Vaneprovides the maximum acousticperformance. The HP model is ideal for themost demanding acoustical environment.
The steel frame for Acousti-Vane silencershas high sound transmission loss. The paintsystem withstands internal gastemperatures and skin temperatures up to200°F. Optional paint systems are available.
How Do I Choose?Three parameters are needed to select thecorrect silencer: (1) required acousticinsertion loss, (2) allowable pressure loss,and (3) the flow in actual cubic feet perminute (ACFM) of your equipment.
Follow these steps to find the silencer thatis most appropriate for your application.
1 Determine the required dynamicinsertion loss by octave band for yourequipment and select the minimumsilencer length that gives the requiredloss for each model.
2 Determine the allowable pressure dropand flow in ACFM for your application.To find the pressure drop for gastemperatures other than 60°F, multiplythe selected value by [520/(actual gastemperature °F " 460)].
3 Choose the Acousti-Vane model foryour application. From the three graphson page 5.5, choose the one that has theallowable pressure drop on the Y-axis.Read straight across until the line meetsthe pressure drop curve. Thecorresponding X-axis value is themaximum face velocity that will maintainthe pressure drop requirement.
4 Divide the ACFM by the required facevelocity to find the minimum silencercross-section that would give therequired pressure drop.
Face velocity is defined as the flow ratein ACFM divided by the silencer facearea in square feet (W # H).
5 Select the silencer from the tables onpage 5.5. Replace L in the part number with the length of silencer you found in step 2. Specify whether the silencer is an LP, MP, or HP model. The pressure drop will be equal to or slightly below the allowable pressure drop you selected. For special applications that require minimum pressure drop and demanding acoustic specifications, contact B&W Universal.
Example Case: Acousti-Vane Selection for a Gas Turbine Inlet1 The insertion loss needed to
attenuate noise is determined to be4, 7, 12, 20, 20, 18, 18, 14, 11 inthe octave band center frequencies31.5 Hz–8 kHz.
2 Tables 1–3 on page 5.5 show thata 12-ft LP, 9-ft MP or a 5-ft HPwould satisfy the requirements.
3 For this application, the allowablepressure drop is 0.25 inches ofwater. Which eliminates the HPmodel (see graph to the right ofthe table). For purposes ofexample, the flow in ACFM isassumed to be 30,000.
4 The graphs on page 5.5 show thatthe maximum face velocity toachieve 0.25 inches of water is2,000 ft/min for the 12-ft LP and1,500 ft/min for the 9-ft MP.
5 Divide the flow in ACFM by therequired face velocity for eachsilencer:
LP ! 30,000/2,000 ! 15 ft2
MP ! 30,000/1,500 ! 20 ft2
6 In Table 4 on page 5.5, find thesilencer size that is equal to orgreater than 15 ft2 for the LP modeland 20 ft2 for the MP. In thisexample, the 4 # 4 LP (at16 ft2 face velocity) and 4 # 6 MP(at 24 ft2)meet your specifications,so you choose between:
AV $ 4 # 4 $ 12 $ LP
or
AV $ 4 # 6 $ 9 $ MPAcousti-Vane dimensions. The silencercomes in standard cross-sectionaldimensions and standard flange patterns.Flange patterns also can be designed tomatch your specifications. Silencers maybe applied at temperatures that rangebetween $20°F and 200°F. For standardflange patterns, silencer weights, and otherdetails, request Technical Bulletin 94-1327.
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0.10
0.12
0.14
0.16
0.18
1K 1.1K 1.2K 1.3K 1.4K 1.6K1.5K 1.7K 1.8K 1.9K 2K
0.04
0.02
0.06
0.08
Face Velocity, ft/minPressure Drop, inches of H
2 O
12 ft. Acousti-Vane 9 ft. Acousti-Vane 6 ft. Acousti-Vane 3 ft. Acousti-Vane
0.40
0.50
0.60
0.70
0.80
1K 1.1K 1.2K 1.3K 1.4K 1.6K1.5K 1.7K 1.8K 1.9K 2K
0.10
0.00
0.20
0.30
Face Velocity, ft/min
Pressure Drop, inches of H2 O
3456789
101112
1122233344
2344556677
4567889
101112
59
1013151618202224
79
1113151821242628
58
1012121416202020
3479
111315181818
245679
11141414
1224579
111111
Octave Bands (Hz)SilencerLength (ft) 31.5 63 125 250 500 1K 2K
LP (low pressure drop) Models
4K 8K
1
3456789
101112
3333445566
4455667788
7899
101012141515
10121518202224252628
12162025272930323436
13162022242729323232
11131518212426282828
9111213141516181818
57899
1012141414
Octave Bands (Hz)SilencerLength (ft) 31.5 63 125 250 500 1K 2K
MP (moderate pressure drop) Models
4K 8K
2
3456789
101112
3344555667
5678899
101011
9101214151617191920
13162123252729313335
15182226303336394245
16202327313641464748
16202427313336394245
12141619212427303030
7101214161820222324
Octave Bands (Hz)SilencerLength (ft) 31.5 63 125 250 500 1K 2K
HP (high performance) Models
4K 8K
3
2.00
2.50
3.00
3.50
4.00
1K 1.1K 1.2K 1.3K 1.4K 1.6K1.5K 1.7K 1.8K 1.9K 2K
0.50
0.00
1.00
1.50
Face Velocity, ft/min
Pressure Drop, inches of H2 O
Notes: Dynamic insertion loss in dB for face velocities <1500 ft/min, and pressure drop for gas temperatures of 60 ˚F. To find the pressure drop for gas temperatures other than 60˚F, multiply the selected value by [520/(actual gas temperature ˚F + 460)]. Contact B&W Universal for more information about face velocities >2000 ft/min.
4 Acousti-Vane Part Numbers and Face Areas
AV-2 #2-L-mAV-2 #3-L-mAV-2 #4-L-mAV-3 #4-L-mAV-4 #4-L-mAV-4 #6-L-mAV-5 #6-L-mAV-6 #6-L-mAV-6 #8-L-mAV-7.5#7.5-L-mAV-8 #8-L-m
Part Number (AV-H # W-model)
468
1216243036485664
Face Area (ft2)
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1K 1.1K 1.2K 1.3K 1.4K 1.5K 1.6K 1.7K 1.8K 1.9K 2K
0.500.25
0.75
0.00
1.001.251.501.75
Face Velocity, ft/min
Pressure Drop, inches of H2 O
5 ft. Acousti-Tube4 ft. Acousti-Tube3 ft. Acousti-Tube2 ft. Acousti-Tube
Acousti-Tube dimensions.The Acousti-Tube silencer comes in standardcross-sectional dimensions and standardflange patterns. Flange patterns also can bedesigned to match your specifications.
2345
0011
2234
5678
79
1113
13172023
26324042
40505560
39485356
32374143
Octave Bands (Hz)SilencerLength (ft) 31.5 63 125 250 500 1K 2K
Dynamic Insertion Loss in dB for Face Velocities <1500 ft/min
4K 8K
1
Figure 1Pressure Drop versus Silencer FaceVelocity. To find the pressure drop for gastemperatures other than 60°F, multiply theselected value by 520/(actual gastemperature °F " 460).
Acousti-TubeAbsorptive Tubular Flow TypeRectangular Silencers
The Acousti-Tube silencer comes instandard cross-sections and lengths, whichcover a wide range of applications and areeconomical solutions to industrial fan noiseproblems. The silencer’s modular designenables customization for non-standard configurations without any loss of acousticperformance or increased pressure loss.
Composite materials are used in the flowpathto reduce corrosion and maintenance.
The modular, compact, lightweight Acousti-Tube silencer knocks out high-frequencynoise while minimizing pressure drop.
How Do I Choose?As with the Acousti-Vane, three parametersare needed to select the correct Acousti-Tube silencer: (1) required acousticinsertion loss, (2) allowable pressure loss,and (3) the flow in actual cubic feet perminute (ACFM) for your equipment.
Follow these steps to choose theappropriate silencer:
1 Determine the required dynamicinsertion loss by octave band for yourequipment. Use Table 1 to select theminimum silencer length that gives therequired octave band insertion loss.
2 Determine the allowable pressure dropand ACFM for your application. In Figure 1, find the Y-axis value for theallowable pressure drop. Read straightacross the graph to the pressure dropcurve. The corresponding X-axis value isthe maximum face velocity that willmaintain the pressure drop requirement.
3 Divide the ACFM by the required facevelocity to find the minimum cross-section that gives the required pressuredrop. Face velocity is defined as the flowrate in ACFM divided by the silencer facearea in square feet (W # H).
4 Select the silencer model from Table 2.Replace L in the model number with the length of silencer you found in step 2. The part number for ordering will be the prefix 07-, the dimensions of the silencer, and the suffix -AA. So a 2 # 2 # 4 silencer would have a part number of 07-224-AA. For special applications that require minimum pressure drop and demanding acoustic specifications, contact B&W Universal.
Acousti-Tube Part Numbersand Face Areas2
AT-2 #2-LAT-2 #3-LAT-2 #4-LAT-3 #4-LAT-4#4-LAT-4 #6-LAT-5 # 6-LAT-6 #6-LAT-6 #8-LAT-7.5 #7.5-LAT-8 #8-L
468
1216243036485664
Part Number (AV-H # W-L) Face Area (ft2)
The lightweight, easy-to-handle designreduces shipping cost and installation time.The Acousti-Tube modules are factory-assembled in a high-transmission-loss steelframe. The frame has a standard high-performance, two-coat paint system oninterior and exterior surfaces suitable foroutdoor installations.
Acousti-Tube silencers operate optimally attemperatures between –20°F and 200°F.
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GeneralInformation
Vacuum Pump LiquidSeparator-Silencers
Operation and CapacityWhen a vacuum pump starts operating atnormal atmospheric pressure, systempressure drop and power requirements are attheir maximum. As the vacuum pumpcontinues to evacuate the system, the inletpressure decreases so the system pressurelosses and power requirements decrease.The inlet volume flow in actual cubic feet perminute (ACFM) stays essentially constantthroughout system operation, but because ofdecreasing inlet pressure, the dischargevolume decreases until normal operatingconditions are reached.
Vacuum pump capacities at operatingconditions are expressed by the inletvolume flow of air and the amount that theinlet pressure has been reduced belowatmospheric pressure. Thus, vacuum pumpcapacities are stated in inlet ACFM at arelative vacuum, usually measured in inchesof mercury (Hg).
Liquid Separation PerformanceSeparator-silencers meet their rated liquidseparation efficiency at a nozzle velocity of5,500 ft/min. At lower velocities theirperformance improves. At higher velocitiestheir efficiency decreases. The nozzlevelocity is the air velocity in the inlet ordischarge nozzle and is equal to the actualvolume flow rate (ACFM) divided by thenozzle area.
Since the inlet volume flow rate is nearlyconstant during normal vacuum pumpoperation, the inlet separator-silencershould be sized so the velocity does notexceed 5,500 ft/min during all phases ofoperation (Table 1, page 6.2).
The discharge flow rate decreases fromstartup to normal operation, and in someapplications it may be acceptable to exceeda velocity of 5,500 ft/min during startup. If it is not acceptable to discharge liquidduring startup, the velocity must be reduced.
Vacuum Pump SystemsSeparator-silencers are used to removeliquid from gas flow vacuum systems usingeither liquid-sealed rotary positive blowersor liquid ring vacuum pumps (Fig. 1).
Separator-silencers may be required forboth the inlet (vacuum) and the discharge(atmospheric) of a vacuum system. Only themost stringent acoustical environments
require significant inlet silencing. An inletseparator provides corrosion protection forthe vacuum pump by removing most, if notall, of the process liquid before it enters thevacuum pump.
The vacuum pump or blower discharge isnormally extremely noisy and requires ahigh-performance separator-silencer.
liquidair
dischargeseparator-silencer
inletseparator-silencer
vacuumpump
1
2
3
4
5
6
7
Figure 1This is an example of a vacuum pumpand liquid removal system. Air and liquidenter the inlet separator-silencer duringprocessing (1). Process liquid isremoved (2), and air enters the vacuumpump (3). The pump takes in seal liquid(4). Air and seal liquid are pumped intothe discharge separator-silencer (5),which removes the liquid (6) and sendsthe air into the atmosphere (7).
If some liquid bypass is allowed duringstartup, the selection of the dischargeseparator-silencer should be based onpressure drop.
Inlet and discharge separator-silencersrequire drain systems to remove the liquid.These systems (both inlet and discharge)must provide an adequate drain sealingsystem or liquid level to offset the vacuumon the inlet side and prevent blowout on thedischarge side. See Tables 2 and 3 on thefollowing page for liquid removal data.
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Application GuideVacuum Pump LiquidSeparator-Silencers
Technical DetailsSeparator-silencer pressure drop depends onvelocity and pressure. In a vacuum system,pressure drop is at a maximum duringstartup. Under normal atmosphericconditions, the pressure drop at startup, foreither an inlet or discharge separator-silencer,is calculated from the following equation:
ACFM = inlet volume flow ratec = separator-silencer DP coefficient
(see Table 3)!P = pressure drop in inches of water
p = separator-silencer size(nozzle diameter) in inches
V = velocity in ft/min
If the startup pressure drop is too great, usethe flow given for a lower relative vacuum,or calculate a separator-silencer size fromthis equation:
c = separator-silencer DP coefficient!P = desired pressure drop in inches
of waterp = separator-silencer size
(nozzle diameter) in inches
ACFMp2
c477
2!P ! ! "
p ! 0.214 ACFM
V4005
2
! c ! "
#$$$$#$$
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618202224262830
3070
120190270370480750
1,0801,9203,0004,3005,9007,7009,700
12,00014,50017,30020,30023,50027,000
3681
144225324441576900
1,3002,3103,6005,1907,0609,220
11,67014,41017,43020,75024,35028,24032,420
45101180282406552721
1,1301,6202,8804,5106,4908,830
11,50014,60018,00021,80026,00030,50035,30040,600
60135241376541737963
1,5002,1703,8506,0208,660
11,80015,40019,50024,10029,10034,70040,70047,20054,100
75169301471678922
1,2001,8802,7104,8207,53010,80014,80019,30024,40030,10036,40043,40050,90059,00067,800
90204362565814
1,1101,4502,2603,2605,7909,050
13,00017,70023,20029,30036,20043,80052,10061,20070,90081,400
98221393614884
1,2001,5702,4503,5306,2809,800
14,10019,20025,10031,80039,30047,50056,50066,40077,00088,400
Operating Vacuum, Inches of HgNominalSize 0* 5 10 15 18 20 25**
Maximum Capacity (Inlet ACFM) for Full Liquid Separation Efficiency at Operating Vacuum
* This column is used for inlet separator-silencers and discharge separator-silencers with no liquid bypass during startup.** Capacity at operating vacuum greater than 20" Hg is limited by startup conditions.
Drain Size (O)
Models UWVS, UWSI,RWVS, RWSI
ModelsUVCS, UVRSRVCS, RVRS RWVS/UWVS 4.0 99%
RWSI/UWSI 3.0 90%RVCS/UVCS 4.0 99%RVRS/UVRS 4.5 >99%
Model Pressure DropCoefficient (C)
SeparationEfficiency
1
Maximum Liquid Flow in GPMfor Various Drain Sizes*2
Pressure Drop Coefficientsand Separation Efficiency3
* Values are based on gravity drain and may be larger witha positive drainage system.
c!P
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10
15305075
120150200300450800
1,200
10203560
100125160260400650
1,000
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RWVS/UWVSSeries
Inlet Liquid Separator-Silencers
P
N
L
Z
P
O
inletflow
K
D
J
P
N
LP
O
inletflow
Z
UWVSPart
Number6U-#-AA P (nom.) O (nom.) N L K
KUWVS
Z J D Weight
The RWVS and low profile UWVS inletliquid separator-silencers provide corrosionprotection for vacuum pumps by removingmost of the process liquid before it entersthe vacuum pump. These separators arebest suited for full vacuum conditions undercritical applications which require inletsilencing. Exterior surfaces receive a shopcoat of rust inhibitive primer.
Max.ACFM
at Vacuum(Blower Inlet)
LiquidGPM**
Rated Capacity*
* Capacities for larger sizes available on request.** If maximum gas flow is not exceeded for a given separator size, liquid GPM may exceed nominal capacity shown, up to the capacity of the next larger separator.
Side View
Top View
104105106108110112114116118120122124
ModelUWVS-
4568
1012141618202224
RWVSPart
Number6R-#-AA
104105106108110112114116118120122124
ModelRWVS-
45681012141618202224
4568
1012141618202224
22¹⁄₂
33¹⁄₂
456688
1010
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
525866788597
105114135138149158
13¹⁄₂
14¹⁄₂
1821¹⁄₂
2631¹⁄₂
36¹⁄₂
41¹⁄₂
47525762
91112141518212424273033
19¹⁄₂
23¹⁄₂
30363745475068667074
5⁵⁄₈
7¹⁄₈
89³⁄₄
10¹⁄₂
13¹⁄₄
1618⁹⁄₁₆
18⁷⁄₁₆
21¹⁄₈
23⁷⁄₈
26⁵⁄₈
12³⁄₄
1618222430364242485460
76144189355442630
1,0291,4011,6452,9252,3843,502
530830
1,2002,1003,3004,7006,0007,800
10,00012,00015,00018,000
355580
150200300400500600800
1,0001,200
UWVS SeriesRWVS Series
40
31.5 63 125 250 500
51015
0
20253035
Octave Band Center Frequency, Hz
Insertion Loss, dB
Typical Insertion Loss
1K 2K 4K 8K
K
D
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RWSI/UWSI SeriesInlet Liquid Separator-Silencers
The RWSI and low profile UWSI inlet liquidseparator-silencers provide corrosion protectionfor vacuum pumps by removing most of theprocess liquid before it enters the vacuumpump. These separators are best suited for fullvacuum conditions under critical applications,which require inlet silencing. The RWSI modelshave a unique profile and larger pipe sizes thanthe RWVS series. Exterior surfaces receive ashop coat of rust inhibitive primer.
* Capacities for larger sizes available on request.** If maximum gas flow is not exceeded for a given separator size, liquid GPM may exceed nominal capacity shown, up to the capacity of the next larger separator.
204205206208210212214216218220222224226228230
4568
1012141618202224262830
121618222430364242485460667278
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
263136465868788898
108120130140150160
1114¹⁄₄
15¹⁄₂
182325¹⁄₂
282830¹⁄₂
33353840¹⁄₂
4345¹⁄₂
91112141518212424273033363942
151821273440465258647177838995
3³⁄₄
5³⁄₁₆
5¹¹⁄₁₆
6¹¹⁄₁₆
6⁵⁄₈
8⁵⁄₈
111312141618202224
22¹⁄₂
33¹⁄₂
4566888
10101010
4082
108202276403708950
1,0501,3081,6192,4812,9863,5544,959
530830
1,2002,1003,3004,7006,0007,800
10,00012,00015,00018,00021,00024,00028,000
355580
150200300400500600800
1,0001,2001,4001,6001,800
UWSIPart
Number6U-#-AA P (nom.) D N L K
KUWSI
Z J O (nom.) Weight
4568
1012141618202224262830
ModelUWSI-
204205206208210212214216218220222224226228230
RWSIPart
Number6R-#-AA
4568
1012141618202224262830
ModelRWSI-
Max.ACFM
at Vacuum(Blower Inlet)
LiquidGPM**
Rated Capacity*
P
inletflow
NP
O
Z
L
K
J
D
P
inletflow
N
P
O
Z
L
K
J
D
Side View
Top View
40
31.5 63 125 250 500
51015
0
20253035
Octave Band Center Frequency, Hz
Insertion Loss, dB
Typical Insertion Loss
1K 2K 4K 8K
UWSI SeriesRWSI Series
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RVCS/UVCSSeries
Discharge Liquid Separator-Silencers
40
31.5 63 125 250 500
51015
0
20253035
Octave Band Center Frequency, Hz
Insertion Loss, dB
Typical Insertion Loss
1K 2K 4K 8K
The RVCS and low profile UVCS modelsprovide high performance liquid separationand noise attenuation. When an inletseparator is not installed, the dischargeseparator may need to be oversized.Exterior surfaces receive a shop coat ofrust inhibitive primer.
All models use a pipe thread connection (MNPT) for the liquid outlet (O).Sizes 1"–3¹⁄₂" are standard with male pipe thread connection (MNPT).Sizes 4"–16" are standard with 150# ANSI drilled plate flanges.
4¹⁄₂
4¹⁄₂
68
1010121216182224303642
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
301317315302325303335304305306308310312314316
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
22233333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
141417222427302935425256697588
6679
10111213¹⁄₂
14¹⁄₂
1821¹⁄₂
2631¹⁄₂
36¹⁄₂
41¹⁄₂
5¹⁄₄
5¹⁄₄
678899
11121415182124
———————89
101214161619
———————33¹⁄₂
3¹⁄₂
44¹⁄₂
556¹⁄₂
8³⁄₄
8101314161818¹⁄₂
21¹⁄₂
27323240¹⁄₂
4352
———————4¹⁄₄
6¹⁄₄
7¹⁄₄
9¹⁄₄
10¹⁄₄
12³⁄₄
15³⁄₄
18³⁄₄
2³⁄₃₂
2¹⁄₁₆
2³⁄₄
3¹¹⁄₁₆
4⁵⁄₈
4⁹⁄₁₆
5¹⁄₂
5⁷⁄₁₆
7⁵⁄₁₆
8³⁄₁₆
9¹⁵⁄₁₆
10¹¹⁄₁₆
13⁷⁄₁₆
16¹⁄₄
18⁷⁄₈
111¹⁄₂
222¹⁄₂
2¹⁄₂
33333444
45
10152025355095
130240300445620
1,035
P (nom.)
PartNumber6U-#-AA
ModelUVCS-
D N L K E
Low Profile
K F Z R J O (nom.) Weight
301317315302325303335304305306308310312314316
PartNumber6R-#-AA
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
ModelRVCS-
K
J
D
Pipe sizes 1"–3¹⁄₂"
P
inletflow
P
Z
N
L
FE
P
inletflow
P
O
N
Z
L
P
inletflow
P
Z
N
L
FE
K
J
R
DO
K
D
K
J
R
DO
Pipe sizes 4"–16" Pipe sizes 1"–3¹⁄₂" Pipe sizes 4"–16"
Side
Vie
wTo
p Vi
ew
RVCS Series UVCS Series
P
inletflow
P
O
N
Z
L
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86.6
RVRS/UVRSSeriesDischarge Liquid Separator-Silencers
The RVRS and low profile UVRS modelsoffer better attenuation than the RVCS andUVCS models. For pipe sizes 1"–3", theRVRS has a side liquid outlet, while theRVCS has a vertical liquid outlet. Exteriorsurfaces receive a shop coat of rustinhibitive primer.
P
E
F
inletflow
PN
Z
L
K
J
R
D O
Pipe sizes 1"–3"
P
FE
inletflow
P
L
Z
N
P
inletflow
E
F
PN
Z
L
P
FE
inletflow
P
L
Z
N
K
J
R
DO
K
J
D
R
K
R
D O
J
Pipe sizes 3¹⁄₂"–16" Pipe sizes 1"–3" Pipe sizes 3¹⁄₂"–16"
All models use a pipe thread connection (MNPT) for the liquid outlet (O).Sizes 1"–3¹⁄₂" are standard with male pipe thread connection (MNPT).Sizes 4"–16" are standard with 150# ANSI drilled plate flanges.
4¹⁄₂
4¹⁄₂
68
1010121216182224303642
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
401417415402425403435404405406408410412414416
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
22223333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
20³⁄₄
20³⁄₄
2532⁷⁄₈
35¹⁄₂
4144³⁄₈
4759¹⁄₂
71³⁄₄
90¹⁄₄
103¹⁄₄
128¹⁄₂
141¹⁄₄
154¹⁄₄
6679
10111313¹⁄₂
14¹⁄₂
1821¹⁄₂
2631¹⁄₂
36¹⁄₂
41¹⁄₂
5¹⁄₄
5¹⁄₄
678899
11121415182124
3¹⁄₂
3¹⁄₂
4566789
101214161619
1¹⁄₄
1¹⁄₄
1³⁄₄
233333¹⁄₂
3¹⁄₂
44¹⁄₂
556¹⁄₂
15¹⁄₂
14³⁄₄
192526313336¹⁄₂
47577180
101109¹⁄₄
118¹⁄₄
1¹⁹⁄₃₂
1¹⁹⁄₃₂
2³⁄₆₄
2¹³⁄₁₆
3¹³⁄₁₆
3⁹⁄₁₆
4⁹⁄₁₆
4¹⁄₄
6¹⁄₄
7¹⁄₄
9¹⁄₄
10¹⁄₄
12³⁄₄
15³⁄₄
18³⁄₄
2¹⁄₁₆
2¹⁄₁₆
2³⁄₄
3¹¹⁄₁₆
4⁵⁄₈
4⁹⁄₁₆
5¹⁄₂
5⁷⁄₁₆
7⁵⁄₁₆
8³⁄₁₆
9¹⁵⁄₁₆
10¹¹⁄₁₆
13⁷⁄₁₆
16¹⁄₄
18⁷⁄₈
111¹⁄₂
222¹⁄₂
2¹⁄₂
33333444
1010153040455570
140244355460
1,0921,6782,212
P (nom.)
PartNumber6U-#-AA
ModelUVRS-
D N L K E
Low Profile
K F Z R J O (nom.) Weight
401417415402425403435404405406408410412414416
PartNumber6R-#-AA
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
ModelRVRS-
40
31.5 63 125 250 500
51015
0
20253035
Octave Band Center Frequency, Hz
Insertion Loss, dB
Typical Insertion Loss
1K 2K 4K 8K
Side
Vie
wTo
p Vi
ew
RVRS Series UVRS Series
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GeneralInformation
Specialized EngineExhaust Silencers
EN Series SilencersMulti-Chamber SilencersFor the majority of engines and operating conditions, multi-chamber type silencers provide maximum noise attenuation within acceptable back pressure limits. Most naturally aspirated and supercharged engines need this type of silencer. Many turbocharged engines are best silenced with this design also. Factors which influence the choice of silencer design are explained on the following page.
ET Series SilencersStraight-Through SilencersSome engines require very low exhaust system back pressures for maximum performance. Many turbocharged engines and some naturally aspirated engines fall into this category. For these engines, straight-through, reactive silencers are available to provide adequate silencing while imposing negligible restriction on exhaust gas flow.
ES Series SilencersSpark Arresting SilencersOperating locations exist where fire hazards and safety codes require removal of sparks from exhaust gases. B&W Universal’s spark arrestor silencers are engineered to perform the dual function of spark arrestment and silencing for all internal combustion engines.
Multi-chamber exhaust silencers for mostreciprocating engines.
Straight-through exhaust silencers for engines which demand very low back pressures.
Spark arresting exhaust silencers for engines operating in high potential fire areas.
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SizingInformationEngine Exhaust Silencers
Choosing the correct exhaust silencer for agiven engine is an important although notdifficult task. First of all, a degree ofsilencing is chosen that will satisfy thenoise requirements unique to each engineand location. Secondly, the silencer size isselected to accommodate the specifiedvolume of exhaust flow without imposingexcessive back pressure.
Selection of Silencer Type (Grade)Each silencer group described on pages7.3–7.6 has a number of a series withdifferent noise attenuation characteristics.
The series letter designation (e.g., EN2)indicates in relative terms the degree ofnoise attenuation; the higher the number,the greater the attenuation.
2 “Industrial” or “Commercial” grade
3 “Residential” grade
4 “Critical” grade
5 “Hospital” grade
The attenuation curves next to the tables oneach page indicate the attenuation in dB byoctave bands.
These curves are based upon “typical”applications. They will not necessarily definethe precise insertion loss for any specificapplication since the insertion loss achievedmay be influenced substantially by manyfactors, including engine size, type, speed,and unsilenced noise levels and frequencydistribution.
Selection of Silencer SizeThe open flow area within the silencershould be large enough to accommodatethe maximum possible exhaust flow withoutexceeding the engine manufacturer’smaximum allowable back pressure.Improperly sized silencers may cause lossof power or damage to the engine.
Data required:engine exhaust flow (CFM)exhaust temperature (˚F)maximum back pressure (inches of water)
The following formulas enable the correctsilencer size to be quickly determined.
1 Calculate gas velocity.
V = gas velocity!P = back pressure, inches of water
c = silencer pressure drop coefficient(Table 1)
T = exhaust gas temperature, ˚F
Note: Velocity should not exceed15,000 ft/min regardless of the allowable back pressure.
2 Calculate required flow area.
3 From Table 2, select the silencer sizewhich has a flow area equal to orgreater than that calculated, the actualback pressure can be calculated asfollows:
B&W Universal’s engine exhaust silencers are high quality, fully welded, reactive silencers designed to reduce exhaust noise on all types of internal combustion engines. Each engine and each operating location requires a unique combination of silencer properties.
For this reason many different silencermodels are cataloged to cover mostsilencing problems. In cases wherestandard silencers will not meet a particularspec, these custom silencers will satisfy theapplication need.
!P
V ! 4005 c ! "530T " 460
! "!P = c Vactual4005
2
! "530T " 460
EN 2, 3, 4EN5 (1"–10")EN5 (12"")ET2ET4ES2, 3
4.24.25.30.51.04.2
Silencer Model Pressure Drop Coeff. (C)
CFMsilencer flow area
V actual !
CFMV
Flow Area Required (ft2) !
Pressure Drop Coefficients1
0.00550.0120.0220.0340.0490.0670.0870.1360.1960.3490.550.791.071.41.82.22.63.13.74.34.95.66.37.17.98.79.6
10.611.512.615.919.6
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416182022242628303234363840424446485460
Flow Area(ft2)
Diameter(in.)
Flow Area/Size2
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4568
1012141618202224262830
Size
19-104-AA19-105-AA19-106-AA19-108-AA19-110-AA19-112-AA19-114-AA19-116-AA19-118-AA19-120-AA19-122-AA19-124-AA19-126-AA19-128-AA19-130-AA
PartNumber
121416202428363642484854606060
D
40465961747577
113127130142156169181194
L
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
34405354676870
106120121133147160172185
H
9101113¹⁄₂
15¹⁄₂
17¹⁄₂
21¹⁄₂
21¹⁄₂
24¹⁄₂
28¹⁄₂
28¹⁄₂
31¹⁄₂
34¹⁄₂
34¹⁄₂
37¹⁄₂
K
66¹⁄₂
7¹⁄₂
91112¹⁄₂
14¹⁄₂
15¹⁄₂
17¹⁄₂
192022¹⁄₂
24¹⁄₂
25¹⁄₂
27
Min.
151925253030304050556070808090
Max.
Y
6070
130190280420650900
1,4001,6001,8002,5003,2003,4004,700
Weight
EN2
EN SeriesMulti-Chamber Silencers
DrainP
N
N
L H D
DrainK
Y
EN2, EN3, and EN4 Series Engine ExhaustSilencers are heavy-duty, fully welded unitsconstructed of carbon steel sheet and plate.Each silencer is equipped with flangedconnections drilled to match 125/150 lbANSI specifications. Exterior surfacesreceive a coat of heat resistant paint.
For EN5 Series, 1"–3¹⁄₂" are sizes equippedwith standard male pipe thread connections.Sizes 4" and larger have flangedconnections drilled to match 125/150 lbANSI specifications.
The addition of “Y” in the model designationindicates a side inlet. Both configurationsare fundamentally alike and performance isidentical.
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
EN2, EN3, EN4, EN5 Series
End-In, End-Out Design
Side-In, End-Out Design
EN2Y, EN3Y, EN4Y, EN5Y Series
6" pipe size12" pipe size24" pipe size
6" pipe size12" pipe size24" pipe size
40
50
63 125 250 500 1K 2K 4K 8K
30
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
20
10
0
40
50
63 125 250 500 1K 2K 4K 8K
20
30
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
10
0
4568
1012141618202224262830
Size
20-104-AA20-105-AA20-106-AA20-108-AA20-110-AA20-112-AA20-114-AA20-116-AA20-118-AA20-120-AA20-122-AA20-124-AA20-126-AA20-128-AA20-130-AA
PartNumber
141618222630364248485460667272
D
4759607386
111113127129142156181195209220
L
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
4153546679
104106120122133147172186200211
H
10111214¹⁄₂
16¹⁄₂
18¹⁄₂
21¹⁄₂
24¹⁄₂
27¹⁄₂
28¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
40¹⁄₂
40¹⁄₂
K
6789¹⁄₂
1112¹⁄₂
14¹⁄₂
16¹⁄₂
181921¹⁄₂
23¹⁄₂
252728
Min.
20242432365252626262728292
103103
Max.
Y
70130150250390700900
1,2001,4501,6002,3003,0504,4005,0005,400
Weight
EN3 w
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EN SeriesMulti-Chamber Silencers
22-101-AA22-115-AA22-102-AA22-125-AA22-103-AA22-135-AA22-104-AA22-105-AA22-106-AA22-108-AA22-110-AA22-112-AA22-114-AA22-116-AA22-118-AA22-120-AA22-122-AA22-124-AA22-126-AA22-128-AA22-130-AA
68
10121214161822263036364248485460667272
25¹⁄₂
2734404659717285
111136138168193213227240278292329352
3333333333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
19¹⁄₂
2128344053656679
104129131161186206218231269283320343
67899
1011121416¹⁄₂
18¹⁄₂
21¹⁄₂
21¹⁄₂
24¹⁄₂
27¹⁄₂
28¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
40¹⁄₂
40¹⁄₂
2¹⁄₂
3¹⁄₂
4¹⁄₂
555¹⁄₂
689
1011¹⁄₂
1414¹⁄₂
16¹⁄₂
181921¹⁄₂
23¹⁄₂
252728
99
131618243333405065466475858596
106115128139
102030506090
110160300480800
1,0501,2001,7502,7503,0503,5505,1006,5007,6008,300
PartNumber
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618202224262830
Size D L N H K Min.
Y
Max. Weight
EN5
21-104-AA21-105-AA21-106-AA21-108-AA21-110-AA21-112-AA21-114-AA21-116-AA21-118-AA21-120-AA21-122-AA21-124-AA21-126-AA21-128-AA21-130-AA
PartNumber
4568
1012141618202224262830
Size
141618242836364248485460667272
D
59717293
111114125139176190192217231257280
L
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
53656686
104107118132169181183208222248271
H
10111215¹⁄₂
17¹⁄₂
21¹⁄₂
21¹⁄₂
24¹⁄₂
27¹⁄₂
28¹⁄₂
31¹⁄₂
34¹⁄₂
37¹⁄₂
40¹⁄₂
40¹⁄₂
K
6789¹⁄₂
11¹⁄₂
1414¹⁄₂
16¹⁄₂
181921¹⁄₂
23¹⁄₂
252728
Min.
Y
2633334252526363869696
107117128139
Max.
85120170400550950
1,1001,3502,2002,5003,0003,8005,8506,7507,500
Weight
EN4
6" pipe size12" pipe size24" pipe size
40
50
63 125 250 500 1K 2K 4K 8K
30
Octave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
20
10
0
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
20
10
0
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
6" pipe size12" pipe size24" pipe size
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29-104-AA29-105-AA29-106-AA29-108-AA29-110-AA29-112-AA29-114-AA29-116-AA29-118-AA29-120-AA29-122-AA29-124-AA29-126-AA29-128-AA29-130-AA
Part Number
4568
1012141618202224262830
Size
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
121416202428363642484854606066
D
40465961747577
113127130142156169181194
L
34405354676870
106120121133147160172185
H
5080
150230300420650900
1,3001,5001,8502,5503,2003,4004,650
Weight
ET2
30-104-AA30-105-AA30-106-AA30-108-AA30-110-AA30-112-AA30-114-AA30-116-AA30-118-AA30-120-AA30-122-AA30-124-AA30-126-AA30-128-AA30-130-AA
Part Number
4568
1012141618202224262830
Size
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
141618242836364248485460667272
D
59717293
111114125139176190192217231257280
L
53656686
104107118132169181183208222248271
H
80110160400550950
1,1001,4002,3002,5002,8004,0505,5006,5007,100
Weight
ET4
ET SeriesStraight-Through Silencers
ET2 and ET4 Series Engine ExhaustSilencers are heavy-duty, fully welded unitsconstructed of carbon steel sheet and plate.Each silencer is equipped with flangedconnections drilled to match 125/150 lbANSI specifications. Exterior surfacesreceive a coat of heat resistant paint.
Due to low back pressure requirements, noside inlet configuration is cataloged. Insome special cases side inlets may bedesigned on application.
DrainP
N
N
L H D
ET2, ET4 Series
6" pipe size12" pipe size24" pipe size
6" pipe size12" pipe size24" pipe size
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
20
10
0
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
20
10
0
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions. w
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87.6
ES SeriesSpark Arrestor Silencers
ES2 and ES3 Series spark arrestingsilencers are heavy-duty, fully welded unitsconstructed of carbon steel sheet and plate.Each silencer is equipped with flangedconnections drilled to match 125/150 lbANSI specifications. Exterior surfacesreceive a coat of heat resistant paint.
Large capacity spark traps are provided oneach unit which can be easily opened forperiodic cleaning. Side inlet configurationswill be designed on application.
ES2 and ES3 Series may be mountedvertically or horizontally.
25-104-AA25-105-AA25-106-AA25-108-AA25-110-AA25-112-AA25-114-AA25-116-AA25-118-AA25-120-AA25-122-AA25-124-AA25-126-AA25-128-AA25-130-AA
Part Number
4568
1012141618202224262830
Size
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
121416202428363642484854606066
D
40465961747577
113127130142156169181194
L
34405354676870
106120121133147160172185
H
5070
110170290430600850
1,3501,5501,7002,4003,0503,2004,600
Weight
ES2
26-104-AA26-105-AA26-106-AA26-108-AA26-110-AA26-112-AA26-114-AA26-116-AA26-118-AA26-120-AA26-122-AA26-124-AA26-126-AA26-128-AA26-130-AA
Part Number
4568
1012141618202224262830
Size
3333¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
N
141618222630364248485460667272
D
4759607386
111113127129142156181195209220
L
4153546679
104106120122133147172186200211
H
70130160240350600950
1,2001,5001,6502,3503,1004,5005,1005,600
Weight
ES3
DrainP
N
N
L H D
ES2, ES3 Series
6" pipe size12" pipe size24" pipe size
6" pipe size12" pipe size24" pipe size
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
20
10
0
40
50
63 125 250 500 1K 2K 4K 8KOctave Band Center Frequency, Hz
Attenuation, dB
Typical Attenuation Curve
30
20
10
0
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
Note: Dimensions and weights are nominal and may vary slightly with production models.Request certified drawings of specific models for exact dimensions.
End-In, End-Out Design
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AccessoriesEngine Exhaust Silencers
181818181818181818 181818181818
4679
101214172436626990
110130
L(Nominal)
Flex Connectors Companion Flange Set
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
1012141618
P(Size) Weight
Flex Connectors are recommended for engineexhaust applications to compensate forthermal expansion and vibration (but notmisalignment). Flexible material is type 321stainless steel, suitable for temperatures to1200˚F. Flanges and pipe fittings are mildsteel. Sizes 1"–3¹⁄₂" are standard with maleNPT, larger sizes are equipped with flangesdrilled to 125/150 lb ANSI.
80-106180-106280-106380-106480-106580-106680-106780-106880-103480-103580-103680-103780-103880-103980-104080-104180-1042
11¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416182022
¹⁄₂
¹⁄₂
1111¹⁄₂
225¹⁄₂
811142226303436
Part Number P(Fits Pipe Size) Weight
Raincaps
Raincaps prevent rain, snow, and dust fromentering the exhaust system. Non-corrosivebushings insure positive opening. All sizes arestandard in mild steel with high temperaturepaint. Sizes 8"–22" are also available instainless steel—quoted by request andequipped with adjustable counterweights.
Each Companion Flange Set includes onemild steel welding flange drilled to match125/150 lb ANSI, one gasket and one set ofbolts and nuts. Cast iron threaded flanges andstainless steel flanges are available and will bequoted on request. Single and doublereducing flanges are also available.
45681012141618202224262830
7101316303545556590105115130150160
Pipe Size Weight
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AccessoriesEngine Exhaust Silencers
Mounting AttachmentsMounting Attachments are welded in place on the silencer shell to facilitateinstallation. Standard and variabledimensions are available.
Inspection Openings have removable coversto provide access to silencer internals forinspection or cleaning. Usually one openingper silencer chamber is recommended.
80-101980-102080-1021
3 # 44 # 66 # 8
46
12
PartInspection
Opening Size(Oval)
Weight
Inspection Openings
Explosion Relief Covers are designed to openat 5 PSI to protect the silencer shell againstrupture in case of backfire or explosion ofresidual gases within exhaust system. Oneunit in first chamber of silencer is adequate.
80-105980-106080-1053
121620
80110140
Part P-ReliefCover Size Weight
Explosion Relief Cover
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These filters and filter-silencers are availablewith a variety of filter panels, each with itsown restriction characteristics. To reflect thatfact, the total pressure drop for a specific filterapplication is the sum of two pressure dropvalues:
1 The first value is the restriction that canbe attributed to the filter housing withoutfilter panels. This value is found in thegraphs at right.
2 The second value is the restrictionthrough the filter panel media. Thesevalues are taken from the table below.
The pressure drop values for the filter panelsare listed in the table as pressure drop ininches of water gauge at various flow ratesin CFM. The housing pressure drop isshown in graphical form as a function of airflow in CFM versus pressure drop in inchesof water gauge.
To avoid confusion, pressure drop values inthe graphs include pipe entrance pressuredrops from the atmospheric end of the inletpipe. These drops are significant,contributing as much as 75% of the totalpressure drop, and should not be attributedto the filter. Adding the filter transfers thesepressure losses to the interior of the filterhousing. A pressure drop measurement atthe pressure tap on the filter outlet reflectsthe total:
Pipe entrance lossVelocity pressureHousing restriction
Application GuideFilters and Filter-Silencers
500600700800900
1,0001,2501,500
0.010.020.030.030.040.050.080.12
W-2
0.060.080.110.140.170.210.310.44
DD-2
0.090.130.160.210.250.300.440.59
P-11
0.070.100.140.170.210.260.390.56
W-2and DD-2
0.100.150.190.240.290.350.520.71
W-2and P-11
0.800.961.121.281.441.602.002.40
P-8and P-12F
0.280.350.420.490.560.640.831.04
0.290.370.450.520.600.690.911.16
W-2and P-5
0.340.430.530.630.730.851.141.48
DD-2and P-5P-5CFM
per filter
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Pressure Drop Values for 20" ! 25" Panel Filters, in Water Gauge
0.1
0.2
0.5
1.0
2.03.0
5.0
10.0Pressure Drop, in Inches Water Gauge
500 1K 2K 3K 5K 10K 20K 50K 100KFlow Rate, CFM
Pressure Drop Curves for Filter HousingsFH, FSH, BFH, and FASH Series
10"8" 12" 14" 18" 20" 24" 30" 36" 42" 48"16"
6" outlet nozzle size
0.1
0.2
0.5
1.0
2.03.0
5.0
10.0Pressure Drop, in Inches Water Gauge
500 1K 2K 3K 5K 10K 20K 50K 100KFlow Rate, CFM
Pressure Drop Curves for Filter HousingsFH, FSH, BFH, and FASH Series
10"8" 12" 14" 18" 20" 24" 30" 36" 42" 48"16"
6" outlet nozzle size
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FH SeriesFilter
FSH Series Filter-Silencer
The FH and FSH Series use standard panel style filter elements (20" X 25" X 2") that are available in a variety of media types and efficiencies. The supports for the filter frames inside the housings accommodate conventional 2" deep single panel filters or two (2) filters staged in series for critical service. Typically, in dual stage systems, a high efficiency pleated cellulose filter (P-11) is used as a final filter, and a less efficient pleated felt media (DD-2), or wire mesh media (W-2) will be used as primary or pre-filter.
The FSH Series of filter silencers include an integrated internal silencing section for applications that require a degree of moderate noise reduction.
The FH Series filters and the FSH Series of filter silencers are ideal when applied to centrifugal blowers, engines, and gas turbines. For use on reciprocating compressors, please contact B&W Universal for application recommendations.
FH-6-2FH-8-2FH-10-2FH-10-4FH-12-4FH-14-4FH-14-8FH-16-8FH-18-8FH-20-8FH-20-12FH-24-12FH-24-16FH-30-16FH-30-24FH-36-24FH-42-36FH-48-48
Model
FH Filter
36-306-AAL36-308-AAL36-310-AAL36-510-AAL36-412-AAL36-314-AAL36-514-AAL36-416-AAL36-418-AAL36-320-AAL36-520-AAL36-424-AAL36-524-AAL36-330-AAL36-530-AAL36-336-AAL36-342-AAL36-348-AAL
Part Number
FSH-6-2FSH-8-2FSH-10-2FSH-10-4FSH-12-4FSH-14-4FSH-14-8FSH-16-8FSH-18-8FSH-20-8FSH-20-12FSH-24-12FSH-24-16FSH-30-16FSH-30-24FSH-36-24FSH-42-36FSH-48-48
Model
FSH Filter Silencer
37-306-AAL37-308-AAL37-310-AAL37-510-AAL37-412-AAL37-314-AAL37-514-AAL37-416-AAL37-418-AAL37-320-AAL37-520-AAL37-424-AAL37-524-AAL37-330-AAL37-530-AAL37-336-AAL37-342-AAL37-348-AAL
AAABBBCCCCDDCCDDDD
Part NumberConfig.
1,0001,7502,7502,7504,0005,4005,4007,0008,900
11,00011,00016,00016,00020,50020,50035,50048,00063,000
Cap.CFM
68
10101214141618202024243030364248
A(nom.)
25.5025.5025.5025.5025.5025.5040.7540.7540.7540.7561.0061.0050.7550.7576.0076.0076.00101.38
B
23.2523.2523.2532.0032.0032.0042.0042.0042.0042.0050.0050.0056.0056.0056.0056.0081.0081.00
C
23.2523.2523.2532.0032.0032.0042.0042.0042.0042.0050.0050.0056.0056.0056.0056.0081.0081.00
D
34.5034.5034.5038.5038.5038.5047.8847.8847.8847.8855.8855.8862.5062.5062.5062.5087.0087.00
E
5.005.005.005.005.005.005.005.005.005.005.005.005.005.005.005.006.006.00
F
115125130170175180340350350365600610695795
1,0351,0852,4502,870
Weight
FH
145150160200210220405420430440725765855960
1,3401,6702,9003,565
FSH
Number andSize of Filter
Openings
2, 20!25!42, 20!25!42, 20!25!44, 20!25!44, 20!25!44, 20!25!48, 20!25!48, 20!25!48, 20!25!48, 20!25!4
12, 20!25!412, 20!25!416, 20!25!416, 20!25!424, 20!25!424, 20!25!436, 20!25!448, 20!25!4
Noise Attenuation
Nominal capacity is based on an exit velocity of approximately 5,000 ft/min. Filter element capacity may be greater, but this is unrelated to unit capacity.4"-deep filter frames will hold single or dual elements. Weights include the weights of weather louvers only. Refer to page 8.8 for filter element details.
23458
131413
63125250500
1,0002,0004,0008,000
Attenuation, dB Octave Band CenterFrequency, Hz
All units are fabricated of steel sheet and plate that are welded throughout providing a rugged, long-lasting, trouble-free air filtering system. All models are equipped with pressure taps. Outlets are 125/150 ANSI drilled plate flanges. Interior, and exterior surfaces are primed and receive a finish coat of enamel paint. Suitable mounting legs can be fitted in the field or installed at time of manufacture at extra cost.
All housings come with low profile UV stabilized plastic weather louvers. Painted steel weather hoods are available at extra cost.
B
DE
C
AF
Removable Weather Louver
B
F
C
DE
A Removable Weather Louver
B
DE
AF
C
Removable Weather Louver
B
F
C
DE
A Removable Weather Louver
A B C D
Part Numbers (Standard Units with Louvers)
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FRH SeriesFilter
FCRH Series Filter-Silencer
The FRH filters and FCRH Series filter silencers are similar to the FH and FSH Series but have a 2-stage filter system as standard. The second stage consists of a grouping of 12 P-5 cartridge filters for each 20" X 25" X 2" pre-filter.
The high efficiency P-5 cartridge filters have threaded ends that screw into individual receptacles. As each P-5 filter is removed and replaced, less than 4 square inches is exposed to the flow of unfiltered air. As a result, "Hot Swap" changes is an option for these units.
Usually, a moderate efficient panel filter is used as the first stage element. The pleated polyester (DD- 2), or the wire mesh media (W-2) can be used in this manner.
The FRH Series filters and the FCRH Series of filter silencers are ideal when applied to centrifugal blowers, engines, and gas turbines. For use on reciprocating compressors, please contact B&W Universal for application recommendations.
FRH-8-2FRH-10-2FRH-10-4FRH-12-4FRH-14-4FRH-14-8FRH-16-8FRH-18-8FRH-20-8FRH-20-12FRH-24-12FRH-24-16FRH-30-16FRH-30-24FRH-36-24
Model
FRH Filter
38-308-AAL38-310-AAL38-510-AAL38-412-AAL38-314-AAL38-514-AAL38-416-AAL38-418-AAL38-320-AAL38-520-AAL38-424-AAL38-524-AAL38-330-AAL38-530-AAL38-336-AAL
Part Number
FCRH-8-2FCRH-10-2FCRH-10-4FCRH-12-4FCRH-14-4FCRH-14-8FCRH-16-8FCRH-18-8FCRH-20-8FCRH-20-12FCRH-24-12FCRH-24-16FCRH-30-16FCRH-30-24FCRH-36-24
Model
FCRH Filter Silencer
39-308-AAL39-310-AAL39-510-AAL39-412-AAL39-314-AAL39-514-AAL39-416-AAL39-418-AAL39-320-AAL39-520-AAL39-424-AAL39-524-AAL39-330-AAL39-530-AAL39-336-AAL
AABBBCCCCDDCCDD
Part NumberConfig.
1,7502,7502,7504,0005,4005,4007,0008,90011,00011,00016,00016,00020,50020,50035,500
Cap.CFM
81010121414161820202424303036
A(nom.)
25.5025.5025.5025.5025.5040.7540.7540.7540.7561.0061.0050.7550.7576.0076.00
B
22.2522.2542.0042.0042.0052.0052.0052.0052.0060.0060.0066.0066.0072.0072.00
C
40.0040.0042.0042.0042.0052.0052.0052.0052.0060.0060.0066.0066.0072.0072.00
D
46.5046.5048.5048.5048.5048.5057.8857.8857.8865.8865.8872.5072.5078.5078.50
E
3.503.503.503.503.503.504.504.504.504.504.504.504.504.504.50
F
205210375380395655665665675
1,2651,3151,4401,4902,1302,230
Weight
FRH FCRH
245255385435440735745755765
1,5151,5651,6401,6902,4802,630
2, 20!25!42, 20!25!44, 20!25!44, 20!25!44, 20!25!48, 20!25!48, 20!25!48, 20!25!48, 20!25!4
12, 20!25!412, 20!25!416, 20!25!416, 20!25!424, 20!25!424, 20!25!4
Number andSize of Filter
Openings
242448484896969696
144144192192288288
FinalFilters
Noise Attenuation
Nominal capacity is based on an exit velocity of approximately 5,000 ft/min. Filter element capacity may be greater, but this is unrelated to unit capacity.2"-deep filter frames will hold single or dual elements. Refer to page 8.8 for filter element details.
23458
131413
63125250500
1,0002,0004,0008,000
Attenuation, dB Octave Band CenterFrequency, Hz
The FSH Series of filter silencers include an integrated internal silencing section for applications that require a degree of moderate noise reduction.
All units are fabricated of steel sheet and plate that are welded throughout providing a rugged, long-lasting, trouble-free air filtering system. All models are equipped with pressure taps. Outlets are 125/150 ANSI drilled plate flanges. Interior, and exterior surfaces are primed and receive a finish coat of enamel paint. Suitable mounting legs can be fitted in the field or installed at time of manufacture at extra cost.
All housings come with low profile UV stabilized plastic weather louvers. Painted steel weather hoods are available at extra cost.
B
DE
C
AF
Removable Weather Louver
B
F
C
DE
A Removable Weather Louver
B
DE
AF
C
Removable Weather Louver
B
F
C
DE
A Removable Weather Louver
A B C D
Part Numbers (Standard Units with Louvers)
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BFH Series Filter
BFH-4-1BFH-5-1BFH-6-1BFH-8-2BFH-10-2BFH-10-4BFH-12-4BFH-14-4
Filter
35-304-AAL35-305-AAL35-306-AAL35-308-AAL35-310-AAL35-410-AAL35-412-AAL35-314-AAL
Part Number
AAABBCCC
Config.
450700
1,0001,7502,7502,7504,0005,000
CapacityCFM
4568
10101214
A
20¹⁄₂
20¹⁄₂
20¹⁄₂
25¹⁄₂
25¹⁄₂
25¹⁄₂
25¹⁄₂
25¹⁄₂
B
26¹⁄₄
26¹⁄₄
26¹⁄₄
21¹⁄₄
21¹⁄₄
27¹⁄₄
27¹⁄₄
27¹⁄₄
C
151617202327¹⁄₄
27¹⁄₄
27¹⁄₄
D
18192026¹⁄₂
29¹⁄₂
33¹⁄₂
33¹⁄₂
33¹⁄₂
E
4550557070858585
Weight
1, 20!25!21, 20!25!21, 20!25!22, 20!25!22, 20!25!24, 20!25!24, 20!25!24, 20!25!2
Number andSize of Filter
Openings
The B&W Universal BFH Series air filter is a compact, inexpensive unit designed to accommodate the standard 20" X 25" X 2.0" metal sided panels, single stage only, that are available in various media types and efficiencies. If noise is a concern, the BFH filter can be used in series with a separate inlet silencer.
The B&W Universal BFH line of intake filters are designed for application to compressors, blowers, engines, and gas turbines. For reciprocating compressor applications, contact B&W Universal for recommendations.
Nominal capacity is based on an exit velocity of 5,000 ft/min. Filter element capacity may be greater, but this is unrelated to the filter housing capacity. Weights shown do not include the weight of the filter elements. 2" deep panel air filters (20" X 25" X 2") are used on the BFH Series. Pleated cellulose, pleated felted synthetic polyester, or crimped galvanized steel wire mesh are available.
B
Removable Weatherhood
C
D
A Nom.Pipe Size
E
B
C
Removable Weatherhood
A Nom.Pipe Size
A Nom.Pipe Size
B
Removable Weatherhood
DE
CE
The BFH Series units are fabricated of steel sheet and plate and are fully welded to provide a rugged long lasting, trouble-free air filtering system. The filter comes with removable low profile UV stabilized plastic weather louvers. Optional metal weather hoods are available. The filter bottom plate includes an opening and bolting pattern matching 125/150 ANSI Flange specifications. The interior and exterior surfaces of the BFH Series filters are primed and given a coat of enamel paint.
A B C
Part Numbers (Standard Units with Louvers)
Note: Refer to the Filter Elements for Filter and Filter Silencers Section for more information.
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RF Series Filter-Silencer
The B&W Universal RF Series filter-silencer is a high attenuating, reactive (chamber type) silencer of rugged construction, typically required for intermediate and large low speed reciprocating or positive displacement machinery, where broadband noise attenuation and inherent vibration-resistant structural strength is required. The RF Series filter-silencers use wire mesh panel air filters and are standard in four configurations shown below.
Noise Attenuation Part Numbers (Standard with Wire Mesh Elements)
2829292826252423
63125250500
1,0002,0004,0008,000
Attenuation, dB Octave Band CenterFrequency, Hz
RF units are fabricated using steel sheet and plate and are fully welded. Filter panels are serviced through hinged access doors. Flanged connections are provided with 125/150 ANSI drilled plate flanges. Internal and external surfaces are coated with a rust inhibitive primer. Exterior surfaces can be finish coated to customer specifications either during the manufacturing process or in the field if required.
C
B
D
Filter AccessDoors
125#/150#ANSI FlangeDrilling
Drain
AE
E A
C
B
D
Filter Access Doors
125#/150# ANSI FlangeDrilling
Drain
F
E A
Y
Y
C
B
D
Filter AccessDoors
125#/150#ANSI FlangeDrilling
Drain
AE
C
B
Filter Access Doors
125#/150# ANSI FlangeDrilling
Drain
F
Y
Y
RF Series RFY Series RFS Series RFSY Series
RF-6RF-8RF-10RF-12RF-14RF-16
RF Series
Model
42-106-AA42-108-AA42-110-AA42-112-AA42-114-AA42-116-AA
Part Number
RFY-6RFY-8RFY-10RFY-12RFY-14RFY-16
RFY Series
Model
42-206-AA42-208-AA42-210-AA42-212-AA42-214-AA42-216-AA
Part Number
RFS-6RFS-8RFS-10RFS-12RFS-14RFS-16
RFS Series
Model
43-106-AA43-108-AA43-110-AA43-112-AA43-114-AA43-116-AA
Part Number
RF/RFY/RFS-6RF/RFY/RFS-8RF/RFY/RFS-10RF/RFY/RFS-12RF/RFY/RFS-14RF/RFY/RFS-16
Model
1,0501,8752,9504,2505,6007,500
Nom.Cap.CFM
68
10121416
A
242430363642
B
79¹⁄₄
79¹⁄₄
105125124¹⁄₄
143
C
RF
79¹⁄₂
79¹⁄₂
105¹⁄₂
125¹⁄₂
125¹⁄₂
144¹⁄₂
RFY
91³⁄₄
91³⁄₄
91¹⁄₂
137¹⁄₂
143¹⁄₂
163
RFS
1313137
2121
D
RFSY
86¹⁄₄
86¹⁄₄
112132131¹⁄₂
150
RF
8383
109129129148
RFY
95¹⁄₄
95¹⁄₄
121141147166¹⁄₂
RFS
15¹⁄₂
15¹⁄₂
18¹⁄₂
21¹⁄₂
21¹⁄₂
24¹⁄₂
F
9911131416
Y
Min. Min.
2323
34¹⁄₂
403945
1, 20!25!22, 20!25!22, 20!25!24, 20!25!24, 20!25!26, 20!25!2
Number and Size of Filter Openings
400510850
1,2201,2801,950
Weight
RF, RFY RFS
450530920
1,2601,3402,070
For intermediate and large positivedisplacement blowers, reciprocating
engines, and compressors.
Nominal capacity is based on exit velocity of approximately 5,400 ft/min. Filter element capacity may be greater, but this is unrelated to unit capacity.
Refer to page 8.8 for filter element details.
For Sizes above 16" please contact B&W Universal for pricing and availability.For RFSY Series, please contact B&W Universal for pricing and availability.
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FASH SeriesAbsolute Filter
The B&W Universal FASH Series absolute filter silencer represents the ultimate high efficiency air filtration for industrial applications. The FASH Series uses both primary pre-filter and a secondary stage final, panel filter elements, with a combined depth of 20". The combination provides exceptional efficiency on ultra-fine particulates. The combination of the primary and secondary filter elements have a large surface area for low flow resistance and high particulate retention capacity. Filtration efficiency exceeds 99.97% on particles 0.3 microns.
The FASH Series utilizes a unique fluid seal for the final (secondary) panel filter element. A channel, provided on the P-12F final filter holds a stable siliconegel providing a 100% bypass-freesystem when applied to the mostsevere of conditions.
When installed, the filters are staged, so that the less costly roughing pad, and the primary filter can be serviced more frequently than the final secondary stage filter. Under typical conditions, the pre-filter will be serviced about once a year, while the final filter may provide two or three years of service.
FASH-10-4FASH-12-4FASH-14-4FASH-14-8FASH-16-8FASH-18-8FASH-20-8FASH-20-12FASH-24-12FASH-24-16FASH-30-16FASH-30-24FASH-36-24FASH-42-36FASH-48-48
Model
40-510-AA40-412-AA40-314-AA40-514-AA40-416-AA40-418-AA40-320-AA40-520-AA40-424-AA40-524-AA40-330-AA40-530-AA40-336-AA40-342-AA40-348-AA
Part Number
2,7504,0005,4005,4007,0008,900
11,00011,00016,00016,00020,50020,50035,50048,00063,000
Nom. Cap.CFM
101214141618202024243030364248
A
25¹⁄₂
25¹⁄₂
25¹⁄₂
40³⁄₄
40³⁄₄
40³⁄₄
40³⁄₄
616150³⁄₄
50³⁄₄
767676
101¹⁄₄
B
323232424242425050525262627278
C
323232424242425050525262627278
D
5555556161616169697575858595
101
E
3¹⁄₂
3¹⁄₂
3¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
4¹⁄₂
66
F
225240245465475485495810850850955
1,5351,8652,3203,750
Weight
224448888
121216162424
Number ofElements
Noise Attenuation
23458
131413
63125250500
1,0002,0004,0008,000
Attenuation, dB Octave Band CenterFrequency, Hz
Specification details for the P-8 pre-filter and the P-12F final filter can be found on the P-8 and P-12F Specification Sheet.
The FASH Series includes an integral silencing section providing a moderate degree of noise attenuation. The FASH Series filters are constructed using heavy duty carbon steel and plate. The units are welded throughout for a rugged, long lasting, trouble-free filter system.
All FASH Series filters include weather-hoods, pressure tap, and outlet flanges with 125/150 ANSI drilled plate flanges. Interior, and exterior surfaces are primed and finish coated with enamel paint. Suitable mounting legs can be fitted in the field or provided at time of manufacture. Mounting legs will be quoted based on application preferences.
For centrifugal compressors,blowers, and gas turbines.
Nominal capacity is based on exit velocity of approximately 5,000 ft/min. Filter element capacity may be greater, but this is unrelated to unit capacity. 4" deep filter frames willhold single elements or dual elements. Weights do not include the weight of the filter elements. Weight is measured with steel weatherhoods. Louvered weatherhoods reduceweight by 7 lb per filter opening.
B
F
D C
E
125#/150#ANSI FlangeDrilling
A
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P-8 SeriesPrefilter
P-12F SeriesFinal Filter
For New Units—MeasuringPressure DropWhen new filters or filter-silencers areinstalled, make the following two pressuredrop measurements and record the resultsfor future reference:
1 Measure the pressure drop with all filters installed.
2 Measure the pressure drop with the P-8pre-filters removed, but the P-12F finalfilters installed; this gives the pressuredrop across the final filters.
3 Subtract the second value from the first to find the pressure drop across the pre-filters.
Polyester Pad ReplacementReplace the polyester pad when visibly dirty.
Filter ReplacementAfter the units have been in service and thefilters are loaded, determine whether thefilters need to be replaced as follows:
1 Measure the pressure drop with all filtersinstalled and subtract the valuemeasured at installation, when the filterswere clean, to find the pressure dropacross both loaded filters.
2 Measure the pressure drop with the P-8pre-filters removed, but with the P-12Ffinal filters installed; subtract the valuemeasured at installation, when the finalfilters were clean; if the difference ismore than 2", replace the final filters.
3 Subtract the second value from the firstto find the pressure drop across the pre-filters. If the difference is more than 2",replace the final filters.
* The polyester pad (part number 81-0400) is a 2" thick “roughing” filter that fits on the face of the P-8 prefilter. It may be purchased separately in cartons of 12 and shouldbe replaced when it is visibly dirty. Follow the service instructions for replacement.
Seal
Filter Media
Sponge NeopreneGasket
Waterproof Glass Waterproof Glass
Separators Aluminum Aluminum
Frame 16-Gauge Galvanized Steel
16-Gauge Galvanized Steel
ConstructionPleated Media
over CorrugatedSeparators
Pleated Mediaover Corrugated
Separators
Tools Neededfor Removal
Part Number 80-0457
Removal Tool(Need 2)
Part Number 80-0457
Removal Tool(Need 2)
P-8
Silicon Fluid Seal
P-12F
P-8 Prefilter
P-12F Final Filter 81-0429
Model
81-039881-0400*
Part Number
27
47
Weight
19¹⁄₂!24¹⁄₂!8
19¹⁄₂!24¹⁄₂!11¹⁄₂
Size
Individually tested andcertified 85% efficientby N.B.S. test
Individually tested andcertified 99.97%efficient by D.O.P. testfor particle size 0.3 micron
Pressure Drop, Clean Filter
0.6" water at 1,250 CFM
0.6" water at 1,250 CFM
Pressure Drop, Clean Filter
For centrifugal compressors, blowers, engines, and gas turbines. For reciprocating compressors, contact B&W Universal for recommendations.
P-8 Prefilter P-12F Final Filter
P-8 and P-12F absolute filter elementsare not cleanable; they must be replacedwith new elements according to theseinstructions.
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Filter ElementsFilter and Filter-Silencers
B&W Universal offers a wide range of sizes and types of air filters and filter-silencers for application on air-moving equipment and internal combustion engines. This catalog covers our standard off-the shelf models. Most models are stocked for immediate shipment. Special types and configurations, as well as larger sizes that are not cataloged, are quoted upon application to meet specific requirements.
P-11DD-2W-2
P-5
Easy to specify and orderWhen you work with B&W Universal, you can simply provide the flow conditions and equipment manufacturer’s information, and we can recommend a filter or filter-silencer best suited for your application. Using your information, we can prepare a comprehensive technical proposal and price quotation.
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CCS/CS SeriesFilter-Silencers
CCF/CF Series Filters
The B&W Universal Series of cartridge filters and filter silencers offer high performance filtration and silencing in a convenient economical cartridge configuration. Choose from four standard models for pipe sizes from ½" to 16" with flow capacities ranging from 15 to 7,700 CFM.
Three types of filter elements are available: pleated cellulose media, pleated felt media, or wire mesh media.
The CCF and CF series filters are high quality air filters without a silencing section. The CF Series uses a top plate to provide ease of servicing and to axially seal the filter element in place. The CCF Series uses a weather hood to protect the filter element.
The CCS and CS series filters are high quality air filters including a built-in silencing section. The CS Series uses a top plate to provide ease of servicing and to axially seal the filter element in place. The CCF Series uses a weather hood to protect the filter element.
DurabilityWeather hoods for CCF and CCS sizes 2-1/2" through 5" are rugged blue ABS composite material that is paintable. Optional painted metal weather hoods are available at extra cost. All other components are carbon steel construction with semi-gloss enamel finish.
High PerformanceUnique design options combined with the latest manufacturing techniques ensure optimum performance and long life even under the most demanding of conditions.
FunctionalChoice of filter only or filter silencer.
Easy to MaintainRemovable lightweight weather hoods (available on CCF and CCS models), or removable top plate (available on CF and CS models) for easy access and servicing of the filter element.
VersatileInterchangeable filter elements provide options for filtration performance in the same housing.
CCS Series (with weatherhood) CS Series (with top plate)
CCF Series (with weatherhood) CF Series (with top plate)
¹⁄₂
Pipe Size
³⁄₄
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
445568
10121416
34-K50-TT*34-K70-TT*34-K01-TT*34-K21-TT*34-K15-TT*34-K02-TT*34-K25-TT*34-K03-TT*34-K35-TT*34-K04-TT*34-K04-AA*34-K05-TT*34-K05-AA*34-K06-AA*34-K08-AA*34-K10-AA*34-K12-AA*34-K14-AA*34-K16-AA*
34-M50-TT*34-M70-TT*34-M01-TT*34-M21-TT*34-M15-TT*34-M02-TT*34-M25-TT*34-M03-TT*34-M35-TT*34-M04-TT*34-M04-AA*34-M05-TT*34-M05-AA*34-M06-AA*34-M08-AA*34-M10-AA*34-M12-AA*34-M14-AA*34-M16-AA*
34-L21-TT*34-L15-TT*34-L02-TT*34-L25-TT*34-L03-TT*34-L35-TT*34-L04-TT*34-L04-AA*34-L05-TT*34-L05-AA*34-L06-AA*34-L08-AA*34-L10-AA*34-L12-AA*34-L14-AA*34-L16-AA*
34-N21-TT*34-N15-TT*34-N02-TT*34-N25-TT*34-N03-TT*34-N35-TT*34-N04-TT*34-N04-AA*34-N05-TT*34-N05-AA*34-N06-AA*34-N08-AA*34-N10-AA*34-N12-AA*34-N14-AA*34-N16-AA*
CCS CS CCF CF
Part Numbers
*Specify “P” at end of part number for unit with pleated paper elements, “F” for pleated felt or “W” for wire mesh.Refer to page 8.11 for filter element details.
Sizes ¹⁄₂"–1" Use CCS or CS Series
Performance Benefits
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CCS/CS SeriesFilter-Silencers
CCF/CF Series Filters
¹⁄₂
³⁄₄
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4 (NPT)4 (flanged)5 (NPT)5 (flanged)6810121416
P(size)
1522356075
120190275375500500750750
1,1002,2003,0004,3005,9007,700
RatedFlowCap.
(CFM)
8.008.008.009.009.009.00
13.4413.4413.4413.4413.4413.4413.4418.0020.0024.0024.0030.0030.00
D
3.133.133.133.503.503.506.756.756.756.756.756.756.759.50
18.0011.5011.5015.4415.44
H
6.006.006.006.506.506.50
10.0010.0010.0010.0010.0010.0010.0014.0014.0018.0018.0024.0024.00
B
———
1.001.001.131.134.001.814.004.004.004.004.004.004.00
N L Approx. Weight with Paper Elements
CCF CCS CF CS CCF CCS CF CS CCF CCS CF CS
——————
1.001.001.131.133.001.813.003.003.003.003.003.003.00
———
1.001.001.131.134.001.814.004.004.004.004.004.004.00
——————
1.001.001.131.133.001.813.003.003.003.003.003.003.00
3.503.503.507.507.507.637.63
10.508.38
10.5013.3121.8815.3815.3819.3819.38
6.506.506.507.887.887.88
17.6917.6917.6917.6919.6318.2519.5625.2533.8829.2529.2536.2536.25
3.503.503.507.137.137.257.25
10.138.00
10.1312.7521.3814.1914.1918.2518.25
6.506.506.507.887.887.88
17.3117.3117.3117.3119.2517.8819.1324.7533.3828.1328.1335.0635.06
998
111013121412163143526497
101
777
1010101918201921192343568391
143145
555
109
1211131115233041487579
777998
1817191820182235436775
121123
UseCCS
Series
Use CS
Series
Use CCS
Series
Use CS
Series
Use CCS
Series
Use CS
Series
Noise Attenuation, CCS/CS
58
101214141414
63125250500
1,0002,0004,0008,000
Attenuation, dB Octave Band CenterFrequency, Hz
Pressure Drop, All Models
0.71.62.84.46.3
50%75%
100%125%150%
Pressure Drop(in. of H20)
Percentage of Rated Flow
All models have a ¹⁄₈" FNPT tap for installation of a gauge or manometer to monitor pressure drop. Sizes ¹⁄₂" through 3¹⁄₂" are standard with female pipe thread connection(FNPT). Sizes 4" and 5" are available with female threads or flanges. Please specify “threaded” or “flanged” when you order 4" and 5" sizes. Sizes 6" through 16" are standardwith 150# ANSI drilled plate flanges. Rated capacity is based upon exit velocity of approximately 5,500 ft/min. If pressure drop allowance permits, capacity may be increasedby as much as 50%.
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CCS/CS/CCF/CFFilter Elements
Pleated Paper ElementSpecifications
High-quality industrial grade filterpaper—pleated and oven-cured duringproduction.Oven-cured plastisol end caps withmolded sealing beads.Media efficiency: 99.5% on 2 microns; 97% on 1 micron.Maximum operating temperature: 200°Ffor units with ¹⁄₂" through 16" pipe sizes.
Service InstructionsBecause of the low cost of the paperelement, it is generally treated as aconsumable and replaced when dirty.However, depending on customerpreference, the paper element may becleaned with compressed air and reused.
Compressed Air CleaningCarefully direct compressed air (100 PSImaximum) through the dry element,opposite the normal direction of flow. Aftercleaning, inspect carefully for holes orcracks. If damaged, replace element.
Pleated Felt ElementSpecifications
Durable polyester felt media—pleated.Oven-cured plastisol end caps withmolded sealing beads (larger elementsfor pipe sizes 10", 12", 14", and 16" havemetal end caps with closed cell rubbergaskets).Media efficiency: 99% on 10 microns.Maximum operating temperature: 200°Ffor units with ¹⁄₂" through 8" pipe sizes,250°F for units with 10" through 18" pipesizes using elements with metal end caps.
Service InstructionsPleated felt elements may be cleaned withcompressed air (as described for paperelements) or water and reused.
Water CleaningRap gently to dislodge accumulated dirt,soak thoroughly approximately 15 minutesin warm water and mild detergent. Rinsethoroughly under low pressure water. Airdry—do not dry with compressed air. Aftercleaning, inspect carefully for holes orcracks. If damaged, replace element.
Wire Mesh ElementSpecifications
Galvanized wire-mesh media—corrugated construction.May be cleaned and reused indefinitely.Wire mesh elements are considered“roughing” filters and are notrecommended for applications whichrequire efficient filtration of fine particles.Approximate efficiency: 93% on 10microns. Efficiency will vary withelement oil or adhesive coverage.Maximum operating temperature: 200°F for ¹⁄₂" through 16" with oil-freeadhesive (flash point of adhesive is235°F) and 300°F for ¹⁄₂" through 16"without adhesive.
Service InstructionsNew elements are delivered pre-treated with B&W Universal’s oil-free adhesive. See the back page for details. For best efficiency, wire mesh elements must be retreated after each cleaning. Spray the element on both sides with B&W Universal Oil-Free Adhesive, P/N 81-0323, following the directions on the container. For oil treatment, dip the element in SAE 30–50 motor oil and drain thoroughly before using.
CleaningTo clean wire mesh elements, wash in solvent or warm water and detergent in a container large enough for complete immersion of element. Rinse completely, drain, and either air dry or use compressed air. After cleaning and drying, retreat the element with oil-free adhesive or oil as described.
Three types of filter elements are availablefor Universal’s cartridge filters and filter-silencers. Pleated paper elements providethe highest efficiency and are consideredstandard. Pleated felt and wire meshelements are available for less demandingservice with respect to efficiency. The threetypes of elements are completelyinterchangeable and will fit all CCS, CS, CFor CCF filter housings.
¹⁄₂
³⁄₄
11¹⁄₄
1¹⁄₂
22¹⁄₂
33¹⁄₂
4568
10121416
P(Nom.)
81-047081-047081-047081-047181-047181-0471
81-1063, 81-0472 (old)81-1063, 81-0472 (old)
81-106381-1063
81-1063, 81-0474 (old)81-047581-0475 (2)81-116381-116381-116481-1164
Replacement Element Part Number
Paper Felt Wire Mesh
81-120281-120281-120281-120381-120381-1203
81-1205, 81-1204 (old)81-1205, 81-1204 (old)
81-120581-1205
81-1205, 81-1206 (old)81-120781-1207 (2)81-120981-120981-121081-1210
81-103581-103581-103581-103681-103681-1036
81-1038, 81-1037 (old)81-1038, 81-1037 (old)
81-103881-1038
81-1038, 81-1039 (old)81-1040
81-1040, (2) 81-1199 (old)81-120081-120081-120181-1201
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ILF/ILFS SeriesIn-line Filters
Durable ConstructionCarbon steel construction with a high-quality blue enamel finish.Easily removable top cover plate for access and servicing of the filter element.ASME Code construction and special materials (stainless steel) are available.
B&W Universal's ILF and ILFS Series of in-line air filters are designed to withstand the demanding requirements of pressure and vacuum applications. The ILF and ILFS filters come in standard sizes ranging from 3" to 18", with flow capacities from 275 to 9,700 CFM. Three types of filter elements are offered: pleated cellulose, pleated felt, or wire mesh media.
A
Y
C
L
4
D
Lift Handle
RemovableTop Plate
Filter Element
³⁄₄" NPT Drain
¹⁄₄" Pressure TapK
PR
R
P
3
inlet
inlet
K K
A
C
Lift Handle
RemovableTop Plate
Filter Element
¹⁄₄" Pressure Tap
³⁄₄" NPT Drain
P
R R
3
PY
L
ILF Series ILFS Series
ILF-3ILF-4ILF-5ILF-6ILF-8ILF-10ILF-12ILF-14ILF-16ILF-18ILFS-3ILFS-4ILFS-5ILFS-6ILFS-8ILFS-10ILFS-12ILFS-14ILFS-16ILFS-18
Model
34-A03-TT*34-A04-AA*34-A05-AA*34-A06-AA*34-A08-AA*34-A10-AA*34-A12-AA*34-A14-AA*34-A16-AA*34-A18-AA*34-B03-TT*34-B04-AA*34-B05-AA*34-B06-AA*34-B08-AA*34-B10-AA*34-B12-AA*34-B14-AA*34-B16-AA*34-B18-AA*
Part Number
34568
101214161834568
1012141618
P(nom.)
1414141618222228303014141416202424303636
D
24¹⁄₄
24¹⁄₄
25¹⁄₄
2839¹⁄₂
35¹⁄₂
37¹⁄₂
4143³⁄₄
43³⁄₄
23232327353437444852
L
—³⁄₈
³⁄₈
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
—³⁄₈
³⁄₈
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
¹⁄₂
R
15¹⁄₂
15¹⁄₂
1618¹⁄₄
28¹⁄₄
2223272829555¹⁄₂
678¹⁄₂
101112¹⁄₂
13
Y
2727283445424452555729292936444447586266
C
2020202224282834363620202022263030364242
A
1111111213151518191911111112141616192424
K
100110120120140295315450500505115125130170245365395605895945
Weight(est.)
275500750
1,1001,9203,0004,3005,9007,7009,700
275500750
1,1001,9203,0004,3005,9007,7009,700
RatedCap.
(CFM)
888881212121212888881212121212
Number ofBolts
The C dimension is clearance required to remove elements. Non-ASME code construction is suitable for 15" PSI maximum working pressure or 20" Hg operating vacuum.Estimated weight does not include elements. Size 3" is standard with male pipe thread connection (MNPT). Sizes 4" through 18" are standard with 125/150 lb ANSI drilled plateflanges. Rated capacity is based upon flow velocity of approximately 5,500 ft/min. If pressure drop allowance permits, capacity may be increased by as much as 50%. Refer topage 8.14 for filter element details.
*Specify “P” at end of part number for unit with pleated paper elements, “F” for pleated felt or “W” for wire mesh.
Customize to Your ApplicationOptional design features for special production and assembly conditions are available.Choose an ILF model for an "L" configuration, or an ILFS for opposed connections.Interchangeable cellulose, felt or wire media elements for desired filtration efficiency and service life. Built in taps to accommodate pressure gauges.
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ILFV SeriesVacuum Service In-line Air Filters
All models have a 1/8" FNPT for installation of a gauge or manometer to monitor pressure drop.The "C" dimension is clearance required to remove filter elements.Non-ASME Code construction is suitable for 15" Hg. Vacuum.Not applicable for pressure applications.Rated capacity is based on flow velocity of approximately 5,500 ft/min.If pressure drop allowance permits, capacity may be increased by as much as 50%.Sizes 5" through 14" flange are standard with plate flanges, drilled per ANSI Standard for each size.Sizes 2" through 4" are standard with Male Pipe Threaded Inlet and outlet (MNPT).Weight does not include filter elements. See Filter Element section for details.
*Specify "P" at the end of the Part Number for Paper Element, "F" for synthetic felt media, or "W" for wire mesh media.
Filter ElementsPleated cellulose media elements offer the highest filtering efficiency and are considered as standard. Pleated felt media filter elements are offered for less demanding applications. Both element types are completely interchangeable, and will fit any size ILFV filter. See element and accessories page for replacement element part numbers.
Optional Filter Restriction GaugeB&W Universal 81-1234 filter restriction gauge provides a convenient, accurate means of monitoring filter restriction as the filter element is increasingly loaded with contaminant. In-line filters are standard with threaded connections for direct mounting of the restriction gauge.
B&W Universal’s ILFV Series of In line air filters are designed to provide an economical alternative to the ILF Series. Ten Standard connection sizes are available ranging from 2” to 14” with flow ratings from 120 to 5,900 CFM. There are three choices of filter elements available, Pleated Cellulose, Pleated Felt, or Wire Mesh. See the diagram below for additional information.
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34568
1012141618
81-106381-106381-106381-047581-0475 (2 req'd)81-116381-116381-116481-116481-1164
81-120581-120581-120581-120781-1207 (2 req'd)81-120981-120981-121081-121081-1210
81-103881-103881-103881-104081-1040 (2 req'd)81-120081-120081-120181-120181-1201
P Size(nom.) Pleated Cellulose Felt Wire Mesh
ILF/ILFS Series
22¹⁄₂
34568
101214
81-106381-106381-106381-106381-047581-0475 (2 req'd)81-116381-1163 (2 req'd)81-116481-1164 (2 req'd)
81-120581-120581-120581-120581-120781-1207 (2 req'd)81-120981-1209 (2 req'd)81-121081-1210 (2 req'd)
——————————
P Size(nom.) Pleated Cellulose Felt Wire Mesh
ILFV Series
Oil Free AdhesiveThis is an oil-free product developed for use on viscous impingement type filters. It is a substitute for applications that do not permit oil wetting of the filter elements, such as oil-free compressors. B&W Universal Oil-Free Adhesive is available in 13 oz. aerosol spray cans.
Filter Restriction GaugeThe Filter Restriction Gauge provides a convenient, accurate means of monitoring filter pressure drops as the filter element becomes increasingly loaded with dirt. Cartridge Filters and Filter silencers are standard with threaded connections for direct mounting of the gauge.
81-0323
81-1234
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UNIVERSAL
E501-1002 7J
B&W Universal is a subsidiary of The Babcock & Wilcox Company (B&W). Established in 1867, B&W is a global leader in advanced energy and environmental technologies and services for the power, industrial and renewable markets, with operations, subsidiaries and joint ventures worldwide.
For more information or to contact us, visit our website at www.babcock.com/universal.
Babcock & Wilcox Universal1925 Highway 51 - 138Stoughton, Wisconsin, U.S.A. 53589Phone: +1 888.300.4272
www.babcock.com/universal
The information contained herein is provided for general information purposes only and is not intended nor to be construed as a warranty, an offer, or any representation of contractual or other legal responsibility.
© 2017 Babcock & Wilcox Universal, Inc. All rights reserved.
ENERGY | ENVIRONMENTAL
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