Relief Valves - Length Vent Lines

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Maximum length of relief valve vent lines

can be calculated as

l_m = 0.56 (1.1 p_r + 14.7)² d_i⁵ / q_a²         (1)

where

l_m = maximum length of vent line (feet)

p_r = relief pressure (psi)

d_i = inside diameter (inches)

q_a = air flow (lbs./min)

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