PSV Header Sizing Calculator
Sizes relief valve discharge headers for multiple PSVs with isothermal or adiabatic flow models. Verifies backpressure limits and critical flow conditions per API 520/521 relief system guidelines.
Header Configuration
inches
ft
psia
Gas Properties
Air=1
°F
-
PSV Data
psig
lb/hr
Results
Pressure Drop
-
psi
Actual ID-
Exit Velocity-
Mach Number-
Backpressure Analysis
Inlet Pressure-
Backpressure Ratio-
Status-
Flow Analysis
Critical Ratio-
Flow Regime-
Rated Capacity-
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About This Calculator
Sizes PSV discharge headers per API 520/521 standards for safe pressure relief.