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# Pressure Drop in Vertical Section of Gas Piping

## Pressure Drop in Vertical Section of Gas Piping

(OP)
hlo,

im trying to calculate the pr. drop in vertical piping for gas.

i have a vertical section where gas goes down in elevation 5 ft

the pressure at starting point is 85 psig

since there is fall of 5 ft i assume pr. gain can be calculate as = rho x g x h2-h1 where h2 is 5ft , h1 is 0 ft

for frictional drop can we just use the darcy eqn for vertical or there are some other considerations??

attachd sktch

### RE: Pressure Drop in Vertical Section of Gas Piping

If the pressure at the start is 85 psi, then the pressure at the end will be about 84.995 psig.

But your calculation looks OK to me.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Pressure Drop in Vertical Section of Gas Piping

The pressure drop is minimal, you are right

Horacio

### RE: Pressure Drop in Vertical Section of Gas Piping

You can ignore elevation change for piping handling compressible fluids. Only the equivalent length matters for those pressure drop calculations.

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