ASME Section VIII compliant calculations for gas, liquid, and two-phase flow
Calculate required orifice area for gas flow per ASME Section VIII
Calculate required orifice area for liquid flow per ASME Section VIII
Calculate required orifice area for two-phase flow using HEM
Required Orifice Area
-
in²
Flow Type
-
Critical/Subcritical
Capacity Factor
-
Kb/Kw
Compliance
-
ASME Section VIII
Critical Flow Pressure
-
psig
Back Pressure Ratio
-
P2/P1
Reynolds Number
-
Dimensionless
Omega Parameter
-
Two-Phase Flow
ASME Boiler and Pressure Vessel Code, Section VIII specifies requirements for pressure relief devices. Calculations account for back pressure, fluid properties, and flow conditions.
Where A is orifice area (in²), W is flow rate (lb/hr), C is gas constant, K is capacity correction factor, P is relief pressure (psia), MW is molecular weight, Z is compressibility factor, and T is temperature (°R).
Different flow regimes require specific calculation approaches:
Wall thickness and MAWP calculations
Pressure drop and flow calculations
Thermal expansion calculations