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Relief Valves - Length of Vent Pipes

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Maximum length of relief valve vent lines

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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