relief capacity curves - hawk-eye.com · always refer to for the most up-to-date information....

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( 8 0 0 ) 910 - 4 2 95 | w w w. ha w k - e y e . c o m

TA N K AG E | V E N T I N G

R E L I E F C A PAC I T Y C U R V E S

SERIES 4000 MARSH HAWK TRV

SERIES 200 & 300TVTH

SERIES 6000 PVRV

SERIES 5000 EPRV

REVISED MAY 2020

© HAWKEYE INDUSTRIES INC. ALL RIGHTS RESERVED. THIS DOCUMENT IS FOR REFERENCE ONLY AND IS SUBJECT TO CHANGE WITHOUT NOTICE. ANY INFORMATION RELEASED PRIOR TO THE DATE INDICATED ON THIS DOCUMENT IS OBSOLETE. ALWAYS REFER TO WWW.HAWK-EYE.COM FOR THE MOST UP-TO-DATE INFORMATION.

I N T R O D U C T I O N I N T R O D U C T I O NH AW K E Y E I N D U ST R I E S I N C . | F LOW C U R V E R E F E R E N C E B O O K | M AY- 20 20

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A relief capacity curve provides the flow relieving capacity of a particular venting device by plotting the flow rate through the de-vice on the horizontal, or x-axis against the tank pressure specifi-cally pressure at the inlet of the vent, on the vertical or y-axis. These curves can be used to size a venting device for a given application.

R E Q U I R E D I N F O R M AT I O NThe type and configuration of the required device must be known in order to size a vent. This information is often integral to the purpose of the vent. For example, if the vent is for emergency pressure relief, an EPRV will likely be selected, if the relieved vapors must be col-lected or processed then a Pipe-Away PVRV will be selected. Refer to corresponding brochures and technical bulletin TB-1217-TV for assistance in vent selection.

A minimum of three quantities based on the design of the tank, pro-cess or application are required to size a relief device:

• required relieving flow capacity for pressure and/or vacuum;

• maximum relieving pressure/vacuum; and,

• set pressure/vacuum.

Pressure relief and vacuum relief are sized separately.

H OW TO U S E R E L I E F C A PAC I T Y C U R V E S1. Use the device and size estimation charts in conjunction with

the table of contents to find the type and configuration of the device required.

2. Begin sizing by turning to the pressure flow curve (if applica-ble) of the smallest available size for the selected device.

3. Flow curves for multiple set pressures/vacuums are displayed on each graph. Identify the flow curve that corresponds to the required set pressure/vacuum.

4. On the vertical axis (Tank Pressure) find the maximum reliev-ing pressure and draw a horizontal line at this pressure until it crosses the previously identified flow curve.

5. At the point where the flow curve and horizontal line cross, draw a vertical line down to the horizontal axis (Flow Rate through Device). The number on this axis represents the flow rate through the device at the maximum relieving pressure.

6. If the flow rate through the device is lower than the required relieving capacity, repeat steps 3-5 for the next larger vent size until the flow relieving capacity of the vent exceeds the required relieving capacity.

Notes:

i. If the required relieving capacity cannot be satisfied by the largest available size in the selected venting class, a larger venting class, such as an EPRV, or multiple vents can be added to meet the required relieving capacity.

ii. If the minimum required vent size differs as a result of pressure sizing and vacuum sizing, the larger vent of the two must be chosen.

iii. The gas type and conditions must be the same between units. Follow appropriate conversion method to convert between gas types and conditions.

iv. All pressure readings are provided in gauge pressure (ze-ro-referenced to ambient pressure).

U N I T C O N V E R S I O N S - P R E S S U R EThe pressures reported on the capacity charts published by Hawk-eye are reported in in ounces per square inch (ozsi). To convert from other pressure units to ozsi, select the appropriate conversion factor from this chart:

C O N V E R S I O N FAC TO R S

P R E SS U R E TO O U N C E S P E R S Q U A R E I N C H ( O ZS I ) ( 5 S I G -F I G )

To Convert From: Multiply by:

psi pounds per square inch 0.0625

atm atmsophere 235.14

mbar millibar 0.23206

bar bar 232.06

Pa pascals 0.0023206

kPa kilopascals 2.3206

MPa megapascals 2320.6

kgf/m² kilogram (force) per square metre 0.022757

kfg/cm² kiogram (force) per square centimetre 227.57

mmHg millimetres of mercury (60°F) 0.30939

inHg inches of mercury 7.8363

inH2O inches of water 0.57802

Torr Torr 0.30939

U N I T C O N V E R S I O N S - V O L U M E T R I C F LOWThe flow rates reported on the capacity charts published by Hawk-eye Industries are equivalent volumetric flows, in cubic feet per hour, of air at standard conditions, and noted as “SCFH (air).”

Unlike liquid or solid quantities, measuring and reporting gaseous properties is complicated by properties that change as temperature and pressure change. As such, gaseous properties are reported in terms of reference conditions. These are conditions specified by API 2000 7th Edition, Annex D, and may not correspond to other internationally recognized conditions (IUPAC, ISO, etc.).

This means that to convert a unit in normal conditions to a different unit in standard conditions, it is a two step process.

1.) Convert conditions

2.) Convert units

The first reference conditions, called “Standard Conditions,” re-ports the volume of a gas at a pressure of 101.325 kPa absolute [14.696 psia], and at a temperature of 15.56°C [60°F]. Units re-ported in Standard conditions are prefixed with an ‘S’. (eg. SCFM instead of CFM)

The other common condition, usually associated with metric units, is “Normal Conditions.” These report volume of a gas at pressure of 101.325 kPa absolute [14.696 psia] and at 0°C [32°F]. Units reported in Normal conditions are prefixed with an ‘N’. (eg Nm3/hr instead of m3/hr)

To convert between normal and standard conditions, multiply the normal condition property by 1.0281.

Note the units remain the same in these conversions, only the con-ditions change.

To complete the conversion to another unit, i.e. CFH, the appro-



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priate conversion factor from the table below must be used. These conversion factors maintain the same condition of the starting unit.

C O N V E R S I O N FAC TO R S

V O L U M E T R I C F LOW TO C U B I C F E E T P E R H O U R ( C F H ) ( 5 S I G -F I G )

To Convert From: Multiply by:

CFM cubic feet per minute 60

CFS cubic feet per hour 3600

m³/hr cubic metres per hour 35.315

m³/min cubic metres per minute 2118.9

m³/s cubic metres per second 127130

L/hr litres per hour 0.035315

L/min litre per minute 2.1189

L/s litres per second 127.13

US gph US gallons per hour 0.13368

US gpm US gallons per minute 8.0208

US gps US gallons per second 481.25

Imperial gph Imp/UK gallons per hour 0.16054

Imperial gpm Imp/UK gallons per minute 9.6326

Imperial gps Imp/UK gallons per second 577.96

US bpd US Barrels per day 0.23394

Note, if a volumetric flow is provided without a reference condition (i.e not ‘Normal’ or ‘Standard’) do not perform the condition con-version. However, this does not mean that the end unit does not require a reference condition; please consult engineering in these cases.

U N I T C O N V E R S I O N S - GA S F LOW TO A I R AT S TA N D A R D C O N D I T I O N SThe rated flow capacities of venting devices are reported as the flow of air at either standard or normal conditions. This standard practice allows for the direct comparison of performance between venting devices and provides relieving capacity values in units that are similar to most practical venting situations.

In some applications, however, the relieving fluid may be substan-tially different than air at standard or normal conditions. In this case the following equation can be used to convert actual flow to the flow of air at standard conditions:

Where,

qair is the equivalent volumetric flow of air at standard condi-tions in SCFH;

x is the conversion from moles to standard volume;

Mair is the molecular mass of air;

Tair is the temperature of air at standard conditions in °R;

Wfl is the mass flow rate in pounds per hour;

k is the isentropic expansion coefficient for an ideal gas;

r is the ratio of the outlet pressure to the nozzle inlet pressure in absolute terms;

M is the molecular mass of the fluid;

Zi is the compressibility factor of the fluid at the inlet of the noz-zle;

Ti is the temperature of the fluid at the inlet of the nozzle in °R;

n is the isentropic expansion coefficient.

If the fluid properties and temperatures are similar to air at standard conditions, the following equation can be used to estimate the equivalent flow:

Where,

qair is the equivalent volumetric flow of air at standard condi-tions in SCFH;

qfl is the actual volumetric flow rate of the relieving fluid in SCFH;

Mfl is the molecular mass of the fluid;

Mair is the molecular mass of air;

Method and assumptions are detailed in API 2000: Seventh Edi-tion, Section D9.

E X A M P L E C O N V E R S I O N S :Example: Convert 5 kPa to ozsi. From the chart above, the conversion factor is 2.3206. We’ll multiply 5 kPa by this number to get the pressure in ozsi.

5 kPa × 2.2306 = 11.603 ozsi » 11.6 ozsi

Example: Convert 1000 Nm³/hr to Sm³/hr We see that the provided volume is in Normal conditions, by the ‘N’ preceding the volume unit. To convert to an equivalent volume in standard conditions, we multiply by 1.0281

1000 Nm3/hr × 1.0281 = 1028.1 Sm3/hr

Example: Convert 500 Nm3/hr to SCFH We see that the provided volume is in Normal conditions, by the ‘N’ preceeding the volume unit, and we are looking for an answer in Standard conditions.

1.) Convert to standard conditions

500 Nm3/hr × 1.0281 = 514.05 Sm3/hr

2.) Convert units

From the chart, the conversion factor from m³/hr to CFH is

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35.315.

514.05 Sm³/hr × 35.315 = 18,153.7 SCFH.

Example: Convert 1000 US gph to SCFH There is no reference condition on the starting unit, so we can skip the reference condition conversion. Technically then, our answer will be in CFH, not SCFH.

1.) Convert units

From the chart, the conversion factor from US gph to CFH is 0.13368.

1000 US gph × 0.13368 = 133.7 CFH.

Example: Estimate 1000 SCFH Methane flow in stan-dard air-equivalent. As this is asking only for an estimate, so we will use eq. 2.

1.) Determine Molecular Masses

The molecular mass is the sum of the masses of the constituent atoms. The molecular formula for methane is CH4, and the atomic weights of carbon (C) and hydrogen (H) are 12.011 and1.008 respectively.

Mmethane=Mfl=12.011 + 4×1.008 =16.043 g/mol

Mair is empirically derived to be 28.966 g/mol

2.) Convert flow

qfl = 1000 SCFH

qair= 1000 SCFH × (16.043 ÷ 28.966)(1/2)

qair= 1000 × (0.55386) (1/2) = 1000 × 0.74421 = 744.2 SCFH

M O R E C O M P L I C AT E D C O N V E R S I O N SExample: Convert 12 ozsi to Pa The values on the pressure conversion chart are for converting to ozsi, not from. However, we can still use these factors and divide by them instead of multiplying.

From the chart, the conversion factor from Pa to ozsi is 0.0023206. To get bar from ozsi, we will divide by this number.

12 ozsi ÷ 0.0023206 = 5,171.1 Pa.

Example: Convert 20,000 CFH to m³/hr The values on the volumetric flow conversion chart are for con-verting to CFH, not from. However, we can still use these facts and divide by them instead of multiplying.

Note, there is no reference conditions on the units we are work-ing with.

From the chart, the conversion factor from m³/hr to CFH is 35.315. To get m3/hr from CFH, we will divide by this number.

20,000 CFH ÷ 35.315 = 566.3 m³/hr.

Example: Convert 5,000 SCFH to Nm³/hr Note, there are reference conditions on the units we are work-ing with, so we will need to take that into account.

The factor of 1.0281 we have is to go from Normal conditions to Standard conditions. We can convert from Standard condi-tions to normal by dividing by this same number.

1.) Convert to Normal Conditions

5000 SCFH ÷ 1.0281 = 4863.34 NCFH

2.) Convert units

From the chart, the conversion factor from m³/hr to CFH is 35.315. To get m3/hr from CFH, we will divide by this number.

4863.37 NCFH ÷ 35.315 = 137.7 Nm³/hr.

The performance, adequacy, accuracy or appropriateness of the product suggestion(s), information or calculations contained here within cannot be warranted by Hawkeye Industries Inc., otherwise “Hawkeye.” The purchaser, user, owner, otherwise “Requestor,” acknowledges that Hawkeye is not providing any service which can be construed or interpreted as engineering, engineering design, or engineering calculation, and responsibility for any engineered result, requirement or recommendation remains with the Requestor to ensure and verify that a suggested product, information or calculation is appropriate for the intended application and complies with all applicable jurisdictional requirements. Any product suggestion, information or calculation offered here is informational and is not a replacement for engineering analysis, examination or verification. Requestor acknowledges data and application information provided to Hawkeye are not generated, verified for completeness or otherwise under the control, supervision or authority of Hawkeye, and as such the appropriateness, adequacy, and fitness for use, of any calculation and/or subsequent product suggestion cannot be warranted. Any and all calculations performed in the process of generating this recommendation are confidential and remain exclusive property of Hawkeye. ©2017 Hawkeye Industries Inc. All Rights Reserved.

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H AW K E Y E I N D U ST R I E S I N C . | F LOW C U R V E R E F E R E N C E B O O K | M AY- 20 20

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FLOW RATES ARE AT 100% OVERPRESSURE FOR INDICATED SET PRESSURES. LIGHTER SHADED REGION INDICATES EXTENDED SERVICE RANGE (SET PRESSURE > 16OZSI) IF AVAILABLE.

A L L V E N TSD E V I C E F LOW R A N G E - P R E S S U R E

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FLOW RATES ARE AT 100% OVERPRESSURE FOR INDICATED SET PRESSURES. LIGHTER SHADED REGION INDICATES EXTENDED SERVICE RANGE (SET PRESSURE > 16OZSI) IF AVAILABLE.

A L L V E N TSD E V I C E F LOW R A N G E - VAC U U M

A L L V E N TSD E V I C E F LOW R A N G E - VAC U U M

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1.) LOCATE FLOW RATE ON HORIZONTAL (X) AXIS.

2.) TRACE LINE UPWARDS TO DESIRED TANK PRESSURE FROM VERTICAL (Y) AXIS[NOTE: PRESSURE IS IN TERMS OF % OVER SET PRESSURE, WHERE 100% = 2 × SET PRESSURE]

3.) SELECT DEVICE SIZE WHOSE FLOW PROFILE CONTAINS THE INTERSECTION OF THESE TWO LINES.

4.) IF THE INTERSECTION POINT LIES WITHIN MULTIPLE DEVICE PROFILES, SELECT THE LEFTMOST DEVICE FOR SMALLER SIZE.

5.) ONCE DEVICE SIZE IS SELECTED, CONSULT THE FLOW CURVE TO THAT SPECIFIC DEVICE, CONFIGURATION SIZE, VALVE TYPE AND CONFIRM SUITABILITY OF FLOW CAPACITY.

V E N T I N G GAU G E H ATC H E SS I Z E E S T I M AT I O N C H A RT - P R E S S U R E

V E N T I N G GAU G E H ATC H E SS I Z E E S T I M AT I O N C H A RT - P R E S S U R E

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S E R I E S 5 0 0 0 E P R V ( 8 ” - 12 ” )S I Z E E S T I M AT I O N C H A RT - P R E S S U R E

S E R I E S 5 0 0 0 E P R V ( 8 ” - 12 ” )S I Z E E S T I M AT I O N C H A RT - P R E S S U R E

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S E R I E S 6 0 0 0 P V R VS I Z E E S T I M AT I O N C H A RT - VAC U U M

S E R I E S 6 0 0 0 P V R VS I Z E E S T I M AT I O N C H A RT - VAC U U M

ContentsIntroduction to Hawkeye Flow Curve Reference Book ................................................................................................................................................................................................ 2Model 200, 300 & 400 TVTH - 8 API ........Pres. + Vac. Curve .. Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-28VGH] ........................................... 14Series 4000 Marsh Hawk - 8 API ...............Pres. + Vac. Curve .. Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-48VGH] ........................................... 15Series 5000 EPRV - 8 API .............................Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-5080] ............................................... 16Series 5000 EPRV - 10 ANSI .......................Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-5101] ................................................ 17Series 5000 EPRV - 12 ANSI .......................Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-5121] ................................................. 18Series 5000 EPRV - 20 API / ANSI 150# ..Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-5200/5201].................................... 19Series 5000 EPRV - 24 API / ANSI 150# ..Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-5240/5241] ....................................20Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [P-6200/02] ........................................ 21Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-6203/01] ........................................22Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | UBR ............................. [P-6210/12] .........................................23Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | STD .............................. [P-6213/11] ..........................................24Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | UBR .................................... [P-6225] ...............................................25Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-6224]................................................26Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | UBR ...................................... [P-6235] ...............................................27Series 6000 PVRV - 2 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | STD ...................................... [P-6234]................................................28Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [P-6300/02] .......................................29Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-6303/01] ........................................30Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | UBR ............................. [P-6310/12] ......................................... 31Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | STD .............................. [P-6313/11] ..........................................32Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | UBR .................................... [P-6325] ...............................................33Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-6324] ...............................................34Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | UBR ...................................... [P-6335] ...............................................35Series 6000 PVRV - 3 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | STD ...................................... [P-6334] ...............................................36Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [P-6400/02] .......................................37Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-6403/01] ........................................38Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | UBR ............................. [P-6410/12] .........................................39Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | STD .............................. [P-6413/11] .........................................40Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | UBR .................................... [P-6425] ............................................... 41Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-6424] ...............................................42Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | UBR ...................................... [P-6435] ...............................................43Series 6000 PVRV - 4 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | STD ...................................... [P-6434] ...............................................44Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [P-6600/02] .......................................45Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-6603/01] ........................................46Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | UBR ............................. [P-6610/12] .........................................47Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | STD .............................. [P-6613/11] .........................................48Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | UBR .................................... [P-6625] ...............................................49Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-6624] ...............................................50Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | UBR ...................................... [P-6635] ............................................... 51Series 6000 PVRV - 6 ANSI 150# ..............Pressure Curve ........ Pressure Relief Only | Pipe-Away | STD ...................................... [P-6634] ...............................................52Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [P-6800/02] .......................................53Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [P-6803/01] ........................................54Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | UBR ............................. [P-6810/12] .........................................55Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure + Vacuum Relief | Pipe-Away | STD .............................. [P-6813/11] ..........................................56Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure Relief Only | Atmosphere | UBR .................................... [P-6825] ...............................................57Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure Relief Only | Atmosphere | STD ..................................... [P-6824] ...............................................58Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure Relief Only | Pipe-Away | UBR ...................................... [P-6835] ...............................................59Series 6000 PVRV - 8 API ............................Pressure Curve ........ Pressure Relief Only | Pipe-Away | STD ...................................... [P-6834] ...............................................60Series 6000 PVRV - 2 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [V-6200/03/10/13] ......................... 61Series 6000 PVRV - 2 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [V-6202/01/12/11] ..........................62Series 6000 PVRV - 2 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | UBR ..................................... [V-6247] ...............................................63Series 6000 PVRV - 2 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | STD ..................................... [V-6246] ...............................................64Series 6000 PVRV - 3 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [V-6300/03/10/13] .........................65Series 6000 PVRV - 3 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [V-6302/01/12/11] ..........................66Series 6000 PVRV - 3 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | UBR ..................................... [V-6347] ...............................................67Series 6000 PVRV - 3 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | STD ..................................... [V-6346] ...............................................68Series 6000 PVRV - 4 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [V-6400/03/10/13] .........................69Series 6000 PVRV - 4 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [V-6402/01/12/11] ..........................70Series 6000 PVRV - 4 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | UBR ..................................... [V-6447] ............................................... 71Series 6000 PVRV - 4 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | STD ..................................... [V-6446] ...............................................72Series 6000 PVRV - 6 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [V-6600/03/10/13] ......................... 73Series 6000 PVRV - 6 ANSI 150# ..............Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [V-6602/01/12/11] .......................... 74Series 6000 PVRV - 6 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | UBR ..................................... [V-6647] ............................................... 75Series 6000 PVRV - 6 ANSI 150# ..............Vacuum Curve ........ Vacuum Relief Only | Atmosphere | STD ..................................... [V-6646] ............................................... 76Series 6000 PVRV - 8 API ............................Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | UBR ............................ [V-6800/03/10/13] .........................77Series 6000 PVRV - 8 API ............................Vacuum Curve ........ Pressure + Vacuum Relief | Atmosphere | STD ............................. [V-6802/01/12/11] ..........................78Series 6000 PVRV - 8 API ............................Vacuum Curve ........ Vacuum Relief Only | Atmosphere | UBR ..................................... [V-6847] ...............................................79Series 6000 PVRV - 8 API ............................Vacuum Curve ........ Vacuum Relief Only | Atmosphere | STD ..................................... [V-6846] ...............................................80


F LOW C U R V E I N D E X F LOW C U R V E I N D E XH AW K E Y E I N D U ST R I E S I N C . | F LOW C U R V E R E F E R E N C E B O O K | M AY- 20 20

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