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Pipe pressure drop calculation and Excel tools

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1. Calculation principle
2. Calculation tools

1. Calculation principle

The pressure drop in pipes is the sum of the linear pressure drop due to friction with the pipe walls and the singular pressure drop due to the bends, valves...etc... present in the pipe

Pressure drop for straight pipes

Pressure drop in straight pipes

Pressure drop due to piping singularities

Pressure drop in straight pipes and Pressure drop in straight pipes

Total pressure drop

ΔPT=ΔPf+ΔPS


f/2=friction factor, f is Fanning friction factor
DH=Hydraulic diameter in m
um=mean velocity in m/s
ΔPf=pressure drop due to friction in Pa
L=length of pipe in m
ρ=specific gravity in kg/m3
ΔHs=pressure drop due to pipe singularity in m
ΔPs=pressure drop due to pipe singularity in Pa

2. Calculation tools

Please find below some Excel calculation tools for pressure drop in pipes

Pressure drop Excel calculation tool for incompressible (= liquid) flow
Pressure drop Excel calculation tool for compressible (= gas) flow, non choked