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Formula needed for vent size of atmospheric tank

thread481-243735

Formula needed for vent size of atmospheric tank

Formula needed for vent size of atmospheric tank

(OP)
NFPA 30 22.7.4* states "Extension of Emergency Vent Piping. Piping to or from approved emergency vent devices for atmospheric and low-pressure tanks shall be sized to provide emergency vent flows that limit the back pressure to less than the maximum pressure permitted by the design of the tank."

Where can the formula to calculate the pipe sizes be found?

If the answer is the "Hazen-Williams" or "Darcy-Weisbach" equations, how does one allow for air as the medium?

RE: Formula needed for vent size of atmospheric tank

(OP)
Never mind, it is the "Darcy-Weisbach" equation.

RE: Formula needed for vent size of atmospheric tank

Just curious - what equation did you use and what was the result?

RE: Formula needed for vent size of atmospheric tank

The Darcy equation as shown in Crane TP410.

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