Safety Valves in Gas and Vapor Systems
Calculate the minimum discharge area of relief safety valves in gas or vapor systems using either flow rate in lb/hr or SCFM, accounting for temperature, pressure, gas properties, and system coefficients.
Safety Valves in Gas and Vapor Systems
Calculate the minimum discharge area of a relief safety valve in a gas or vapor system.
Calculation Methods:
Method 1 - Flow in lb/hr:
- Formula: A = m T^(1/2) / (C kd kbp P M^(1/2))
Method 2 - Flow in SCFM:
- Formula: A = qs (SG T)^(1/2) / (1.175 C kd kbp P)
Common Coefficients (C) by Gas:
Air: 356, Nitrogen: 356, Oxygen: 356, Natural Gas: 344, Propane: 330, Ammonia: 347, Hydrogen: 357, Methane: 348, Carbon Dioxide: 346