Relief Valve Sizing - Gases & Vapours
PSV Tag Number:
Set Pressure
kPa(g)
Constant back Pressure
kPa(g)
Variable back Pressure
kPa
Built-Up back Pressure
kPa
Overpressure:
%
(21% for fire, 10% otherwise)
Relieving flow rate:
kg/hr
Relieving Temperature:
°C
Molecular Weight:
Cp/Cv
Z (compressibility)
Kd (disch. coeff.):
API Area
mm
2
ASME area:
mm
2
ASME uses a 10% derating factor - ASME VIII div1 UG-131
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