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Engineering ToolBox > Safety Valves in Saturated Steam Systems
The minimum discharge area of relief safety valves in steam systems can be calculated with the equation
A = m / (51.5 kd kbp P1/2) (1)
where
A = minimum discharge area (Square Inches)
m = relieving capacity (Lbs. per Hour)
kd = discharge coefficient - 0.975
kbp = back pressure coefficient - 1.0 for atmospheric discharge systems
P = relieving pressure (psia) - set pressure (psig) + over pressure (psig) + atmospheric pressure (14.7 psia)