ASME Section VIII compliant calculations for gas, liquid, and two-phase flow
Featured: Gas, Liquid, Two-Phase Flow
Calculate required orifice area for gas flow per ASME Section VIII
Required Orifice Area
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ASME Section VIII compliant
Critical Flow Pressure
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Flow Type
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Capacity Correction Factor
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D (0.110 in²)
Up to 4,000 lb/hr air
E (0.196 in²)
Up to 7,500 lb/hr air
F (0.307 in²)
Up to 11,000 lb/hr air
G (0.503 in²)
Up to 18,000 lb/hr air
Calculate required orifice area for liquid flow per ASME Section VIII
Required Orifice Area
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ASME Section VIII compliant
Reynolds Number
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Viscosity Correction
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Back Pressure Correction
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Water @ 100°F
D orifice: ~40 gpm
Oil @ 100°F
D orifice: ~25 gpm
Chemical @ 70°F
D orifice: ~30 gpm
Refrigerant @ 40°F
D orifice: ~20 gpm
Calculate required orifice area for two-phase flow using HEM
Required Orifice Area
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ASME Section VIII compliant
Omega Parameter
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Flow Regime
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Homogeneous Model Factor
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Two-phase flow calculations are complex and depend on:
This calculator uses the Homogeneous Equilibrium Model (HEM) for estimation. For critical applications, consult API 520/521 standards.
ASME Boiler and Pressure Vessel Code, Section VIII specifies requirements for pressure relief devices. Calculations account for back pressure, fluid properties, and flow conditions.
Uses ideal gas law and isentropic flow equations. Critical flow occurs when downstream pressure ≤ critical flow pressure (Pcf = P1 × [2/(k+1)]k/(k-1)).
Based on Bernoulli equation with viscosity (Kv) and back pressure (Kw) corrections. Reynolds number determines viscosity effects.
Uses Homogeneous Equilibrium Model (HEM). Omega parameter (ω) characterizes expansion behavior. API 520 provides detailed methodology.
