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Engineering ToolBox > Length of Relief Valve Vent Line
The maximum length of a relief valve vent line
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)