Relief Valves - Length of Vent Lines

Calculating length of safety valves vent pipes

Maximum length of relief valve vent lines

relief valve

can be calculated as

lm = 0.56 (1.1 pr + 14.7)2 di5 / qa2                                  (1)

where

lm = maximum length of vent line (feet)

pr = relief pressure (psi)

di = inside diameter (inches)

qa = air flow (lbs./min)

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