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Gas Loss Through Hole

Rupture · Leak · Choked Flow Analysis

Gas Leak Rate Calculator
Calculates natural gas release rates through holes using compressible flow equations per GPSA and API standards. Critical for emergency response planning, QRA/RBI studies, and dispersion modeling.
Calculation Mode:

Leak Parameters

in
psig
°F
psia

Engineering Notes

Choked Flow: When Pd/Pu < 0.53 (for k≈1.3), flow is sonic at orifice throat. Further pressure drop doesn't increase flow.

API 581 Holes: Small=¼", Medium=1", Large=4", Rupture=full bore. Used for QRA consequence modeling.

Cd Values: Sharp-edge 0.61, Rounded 0.97, Torn 0.75. Conservative safety studies use Cd=1.0.