Liquid System Safety Valves - Spring Operated

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The minimum discharge area of spring operated relief safety valves in liquid systems can be calculated as

A = q SG^1/2 / (28.14 K_bp K_visc dp^1/2)           (1)

where

A = discharge area (Square Inches)

q = relieving capacity (Gallons per Minute)

SG = Specific Gravity

K_bp = capacity correction for back pressure - 1.0 for atmospheric pressure systems

K_visc = correction factor due to velocity - 1.0 for most water systems

dp = differential pressure - set pressure (psig) + over pressure (psig) - back pressure (psig)

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