user information duct components - mietzsch · 2019. 1. 16. · mws 54120 50 a b f e 2 1 mws...

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GmbH Lufttechnik Dresden

USER INFORMATION

rectangular coss-sectionDUCT COMPONENTSDUCT COMPONENTS

Duct Components (Plastic)according to the MIETZSCH factory standard

Terms / Dimension series

The following terms are used for MIETZSCH ventilation components:Components with a rectangular cross-section: Ducts and fittingsTypes of connectors: G - male connector

M - female connectorR - frame ("rectangular flange"), sub-divided into

R0 - no holesR1 - hole pattern 1 (for normal requirements)R2 - hole pattern 2 (for stricter requirements)

Components and connections with a circular cross-section: Pipes and fittingsTypes of connectors: G - male connector

M - female (pipe socket)F - flange, sub-divided into

F0 - no holesF1 - hole pattern 1 (for normal requirements)F2 - hole pattern 2 (for stricter requirements)

R20 series 100 series Dimension series100 100

110 110125 125140 140160 160180 180200 200 200225 225250 250

Ventilation components with rectangular cross-sections do not have standardised side dimensions. The MIETZSCH dimension series comprises the R20 series according to DIN 323 and the 100-increment series.

If t th i t t d f ti l t ll 280 280300 300

315 315355 355400 400 400450 450500 500 500560 560

600 600630 630

700 700

+ =+ =+ =If not otherwise stated for particular parts, all components such as ducts, fittings, connecting elements, air inlet and outlet elements, etc. are manufactured with these side dimensions.

The nominal sizes always refer to the external dimensions of the ducts and fittings.

00 00710 710800 800 800900 900 9001000 1000 1000

1100 11001120 1120

1200 12001250 1250

1300 1300

R20 series50637590110125140160

Connections and connecting parts with a circular cross-section have the nominal dimensions (diameter) of the R20 series.

The nominal sizes always refer to the external dimensions of the pipes and fittings.

180200225250280315355400450500560630710800900100011201250

01MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)


Dimensioning / Stiffeners

The main loads exerted on the side walls of ventilation ducts and rectangular fittings arise from the pressure differencebetween the inside and the outside of the duct.This causes deformation of the side walls of plastic components (bulging or buckling). The increase in pressure loss in poorlydimensioned ducts may be so severe that the entire system can no longer function, even without components beingmechanically destroyed (no fractures or cracks).Loaded thermoplastics undergo slow creep, thus maximum deformation only occurs after an extended operating period.Although the temperature plays a key role in this case, chemical effects of the gas may also be very important.

The minimum wall thicknesses of unstiffened plastic ducts can be determined according to DIN 4740 and DIN 4741 anddepending on the pressure and temperature as well as the duct dimensions.These calculations are usually carried out using long-term strength values for a loading period of 10 years. In this case, thepermissible deformation is limited to 2% of the largest side of the duct, thus

permissible f < 0.02 x largest duct side

This definition is used as the basis for dimensioning all rectangular air duct components Although these standards only applyThis definition is used as the basis for dimensioning all rectangular air duct components. Although these standards only applyto unstiffened ducts, this 2% requirement is fulfilled by all stiffened ducts and fittings in the MIETZSCH product range.If this deformation narrows the cross-section of the components, the resulting increase in pressure loss can be expected to beabout 5%. This, however, depends on the degree of accuracy of the pressure loss calculation.

Even under "normal" operating conditions (e.g. 1000Pa and 35°C), a PPs duct of 800mm x 800mm requires a wall thickness of15mm to comply with the permissible deflection of 16mm. Thus, components may have to be stiffened, depending on theoperating conditions.

The manufacturer generally specifies the design and dimensions of rectangular air duct components. Therefore, the customermust provide the following information:

maximum internal pressure (over- or underpressure)temperature (permanent, temporary)exposure to media, with material, if appropriaterequired type of stiffening (if necessary)

There are two basic types of stiffening:Examples of duct stiffening

There are two basic types of stiffening:

1) External stiffening

The side walls of the duct are equipped with external ribsor a stiffening frame around the entire circumference.The ribs or frame must be permanently attached to theduct.For low loads (pressure, temperature, dimensions), the

individual plastic rib

circumferential plastic frame

stiffening elements are made of the same thermoplasticmaterial as the duct.For higher loads, the stiffening elements are made ofplastic-coated steel profiles that are attached to the basicbody of the duct. This provides sufficient stability for high-pressure applications.

2) Internal stiffening

plastic-coated steel profile

2) Internal stiffening

Tie rods or a series of tie rods are welded onto the insideof the duct to prevent bulging. If the tie rods are installedas a cross or double cross, they can be additionallysecured at the crossing points.This type of stiffening can only be used for low loads andalso leads to higher pressure losses. The relativelysmooth external surface of the duct is visually

larger duct side is supported by tie rods

advantageous.duct sides are supported by a double cross with fixation at the crossing point


D i ti Di / Di i

Duct Components (Plastic)according to DIN 18379 and the MIETZSCH factory standard

Ducts and fittings

Designation Diagram / DimensionsAbbreviation Preferred dimensions / Comments

No. MIETZSCH Std.Duct, - Wall thicknesses and stiffening

1 air duct according to pressure and temperatureL

(duct section LT - for fitting lengths l+200

b

1 2

for l

D i ti Di / Di i


Ducts and fittings


No. MIETZSCH Std. - Specified dimensions

Elbow = 90° r = 0transition e, f = 150 (for b


Ducts and fittings


No. MIETZSCH Std. - Specified dimensions

Offset l = 100, 200, 300, …..symmetrical

13 ES Inlet and outlet have the

+e1

f-Achse2

same dimensions.See comments on page 6

MWS 54145.00 - Specified dimensions

Offset l = 100, 200, 300, …..transition

f-Achse

1d

2

l

b

e-Achse

+e

c

a

transition14 EA Inlet and outlet have the same width

but different heights.See comments on page 6

MWS 54145.00 - Specified dimensionsc

b

l

l1 2

d

e-Achsea

Tee n = 150 (for b


Definition of dimensions

Definition of dimensions f and e

Dimensions f and e have either a positive or negative value. It is essential that the + or - sign is given when specifying the dimensions of the component.

Further comments on the definitions:

Axial view of the connection end

The ( f, e ) coordinate system is referenced to the upper right-hand corner of the connection end (Point 1).

The axial deviation of the component is given by the ( f, e ) coordinates of Point 2 of the connection end . Thus:

If Point 2 lies to the right of Point 1, f is positive.If Point 2 lies above Point 1, e is positive.

If Point 2 lies to the left of Point 1, f is negative.If Point 2 lies below Point 1, e is negative.

If h i d i i l di i i d b P i 2 d di i f b P i 2 f (If the connection end is circular, dimension e is governed by Point 2-e and dimension f by Point 2-f (see example 2).

Examples 1 (UA - asymmetric transition)

e ePoint 2

ef negativee negative

f negativee = 0

f = 0e positive

f

2

1

Origin(Point 1)

Point 2

2

Origin(Point 1)

1

Point 2

fOrigin (Point 1)

2

1

f

Examples 2 (RA - asymmetric pipe transition)

1 1 1

e

f negativee negative e

f negativee = 0

Point 2-e

e

f negativee positive

2

Origin (Point 1)

f

Point 2-f

Point 2-e

Point 2-f

Origin (Point 1)

Point 2-e

2

f

2

fOrigin (Point 1)

Point 2-f


1 1 1


Connecting elements

Max. ext. dimen- n m sm

sExt. dimensionof duct

G - Male connectorMWS 54010The component has a male connector without a mounted part. Its counterpart must have a female connector.

n

m

sm sion of duct 1) m mm mmup to 125 50 30 2

126 up to 250 50 30 3251 up to 400 50 30 4401 up to 500 80 50 4501 up to 630 80 50 5631 up to 1250 80 50 6

1251 up to 2000 80 50 8

M - Female connector(with socket) MWS 54020

The connector has a welded-on socketsleeve.Its counterpart must have a male connector.

s

ni

mi

mi Max. ext. dimen- ni mi smision of duct 1) m mm mm

up to 250 30 15 2251 up to 400 40 20 3401 t 710 50 25 3

p2001 up to 3000 80 50 10

I - Internal socket (internal socketsleeve) MWS 54020

The end of the component has a socketsm

a

w

401 up to 710 50 25 3711 up to 1250 60 30 41251 up to 2000 80 40 52001 up to 3000 80 40 6

The end of the component has a socketsleeve welded onto the inside.Its counterpart must have a male connectorwith the same internal dimension.

R - Frame (duct flange)MWS 54030sr

dl t

**)

Y

b

**)

The end of the component has a frame.

R0 - no holesR1 - hole pattern 1, t = 125 mm

(normal requirements)R2 - hole pattern 2, t = 75 mm

(stricter requirements)

w

f

ußen

maß

b1

Ød

sion

of d

uct

w Xt

**)

**) If the spacing between the middle holes,

X and/or Y, is


Compensators

Sleeve Frame ca.130...170

axb "plate"

Guide

Type M with welded-on socket sleeve

Application:

Type Fwith frame

Type LRwith frame and guiding unit

Application:Used to compensate expansion and to isolate vibrations in ventilation systems. One compensator can compensate an expansion of approx. 30mm.In a PPs duct, a compensator would have to be installed every 20m or so to compensate expansions of 10K.

Systems with greater underpressures should use M-LR or F-LR (with guiding unit) to prevent excessive buckling.

Dimensions: a, b according to the preferred seriesF di t MWS 54030Frame according to MWS 54030

Materials :PVC PVC Wellflex (grey), coupling sleeve and frame made of hard PVCPPs PP Wellflex (black), coupling sleeve and frame made of hard PPs


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Duct Components (Plastic)Dampers

Operating conditions:Max. flow rate = 10 m/sPermissible continuous load (permissible differential pressure) when the damper is closed:

Throttle damper / shut-off damper

BL

H

when the damper is closed:PVC : 1600 Pa at 30 °CPPs : 1000 Pa at 30 °C

Damper drive: Manual, electric or pneumatic actuators, with a mounting bracket for the actuator

Dimensions: W, H according to MIETZSCH gdimension series

Connectors: Male G, Female M, Frame R0, R1 or R2

Back-draft damper, vertical (V) and horizontal (H)

axb

Operating conditions:Max. flow rate = 16 m/s

axb

Loss coefficient: = 0.32

Dimensions: a, b acc. to MIETZSCH dimension series



APPLICATIONLouvre dampers are used to regulate the volumetric flow rate and pressure or as a shut-off element in ventilationsystems. All parts that come into contact with the flowing gas are made of plastic, which makes them particularly suitable for applications with corrosive exhaust gases, e.g. laboratory air extraction systems or process air engineering.

DESIGNThe louvre dampers consist of a piece of duct with connecting frame and fitted with profiled hollow slats. The slats are connected to an external rod assembly that co-rotates them all simultaneously. The damper is operated manually or by electric (pneumatic) actuators.

Operating Max. flow rate = 10 m/sconditions: Permissible continuous load (permissible differential pressure) when the damper is closed:

1000 Pa at 30 °C

Loss coefficient: = 0.3 ( Damper position: OPEN )

Dimensions: Width W and height H according to the MIETZSCH dimension series, length 200mm.

Air tightness: Standard as a control damper JKL enhanced air tightness JKLL with additional sealing lips Shut-off damper JKLA tested according to Class 1 as per DIN EN 1751

Damper drive: - Type H - manual adjustment, infinite, with arresting device

- Type M - with actuator Actuators are used in the following models as a standard:

adjustable mechanical limitation of the rotation angleambient temperature -30...+50°C, protection class IP 54

BELIMO actuators, operating time 150s, either AC/DC 24V or AC 230VOPEN/CLOSE Standard drive for OPEN/CLOSE or 3-point controlOPEN/CLOSE-S with integrated auxiliary switch (change-over contact)SR modulating with position feedback DC 2 to 10V

- Model K - with mounting bracket for the actuator (please state type of actuator when ordering)

Connectors: Standard models with frame on both ends (according to MIETZSCH factory standard MWS 54030)no holes R0 / hole pattern R1 / hole pattern R2

Materials: either PVC or PPs, slats PPs

Special models: Other materials, other operating conditions (pressure, temperature)Actuating motors according to customer's requirements, pneumatic drivesExplosion-protected dampers conforming to Directive 94/9/EC (ATEX)

Designation:

H

AUF

ZU

B200

JKL _ - _ - _ _ _ _ - _ _ _ x _ _ _ - _ _ _ _ Type of damper (-, L or A)Drive (H, M or K)Type of connector (R0, R1 or R2)Width WHeight HMaterial


Louvre dampers Model series JKL

manually adjustable / with actuator

Duct Components (Plastic)Air extraction units

Application: Air extraction above workplaces in workshops, filling equipment, laboratories, etc.To be connected to an external fan or ventilation system

Air extraction hood ASH

D ventilation system

Models: Wall-mounting: type WSuspended: type HWith additional baffleSpecial designs

Dimensions: W, D, H and D according to customerrequirements

HT B

W - wall-mounted H - suspended

Edge-mounted air extraction units RAKApplication: Air extraction over baths in the

electroplating industryelectroplating industry

Dimensions: Dimensions W, H and L according to customer requirements or adapted tosuit the constructional situation

Models: Slit widths optimised for the air flowwith throttle damper with cleaning hatchgdetachable cover

D

L

H

B


Duct Components (Plastic)Air outlet units

Design: with optional bird screen VSG

Pressure loss: see diagram


Deflector hood

300

400

with VSGwithout VSG

pv / Pa


a x b0

100

200

0 2 4 6 8 10 12

= 1,2 kg/m³

Velocity in connected duct m/s

L a

b

30°

Mesh guard: mesh guard made of PEmesh aperture 20 mm

Dimensions: a, b acc. to MIETZSCH dimension seriesL=500, 1000 mm

Duct with mesh guard

Application: Air outlet element to trap rain in air inlet and outlet units

Rain trap RAS

30° Connectors: Male G, Female M, Frame R0, R1 or R2

Models: Duct fitted with specially designed, inclined trapping profilesCollecting box on one side with drainage port and cleaning hatch


Connectors Male GConnectors: Male G, Female M, Frame R0, R1 or R2

100

150

200

pv / Pa

60

70

80

90

100

LW / dB(A)

Fläche a x b / m²8,04,02,01,00,50,25

Pressure loss Sound powerarea


0

50

0 1 2 3 4 5 6 7 8

= 1,2 kg/m³

Geschwindigkeit im Anschlußkanal m/s

40

50

0 1 2 3 4 5 6 7 8Geschwindigkeit im Anschlußkanal m/sVelocity in connected duct m/s Velocity in connected duct m/s

Weather guard Model series WSG

Bird screen

Slat

Type A Type C

H +

15m

m

Hig

ht H

H +

15m

m

Hig

ht H

Hig

ht H

MAIN DIMENSIONS

100 50160Width B 50

H H mm - mm -200 10,1250 7,1315 200 300 400 500 6,4400 5,3 400 8,5

mm

Type CType AW W

mm

MAIN DIMENSIONS

APPLICATION

450 5,0 450 6,7500 4,7 500 6,6

560 600 700 800 900 1000 5,7630 5,7710 5,2800 4,9

Pressure loss coefficient with respect to area W x HAPPLICATIONAir outlet grille with fixed slats to cover the air outlet openings in walls or ends of horizontally installed, rectangular airducts.

If installed in a wall, the opening must be at least 15mm larger than the nominal dimensions W and H.

MODELSTwo different models having different slat designs. Model C is required for spans wider than W=500mm.

Material: choice of PPs, PVC, PE

SPECIAL DESIGNSThe following modifications are available on request:Special dimensions (particularly width W and overall length)Duct connections as a female connector or frame with pipe connector

Weather guard with pipe connector

ØD

B x

H

DESIGNATIONExample: Plastic weather guard, type WSG, width 400mm, height 315, materials PPs

WSG-A 400 x 315 PPs


Duct components with rectangular cross-sectionTerms / Dimension seriesDimensioning / StiffenersDuct Components, Fittings according to DIN 18379Connecting elementsCompensatorsList of measurement / orderDampersLouvre dampersAir extraction unitsAir outlet unitsWeather guard

user information duct components - mietzsch · 2019. 1. 16. · mws 54120 50 a b f e 2 1 mws...

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