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Pipe pressure drop calculation and Excel tools

Pressure drop calculation methodology and free Excel calculation tools

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1. Calculation principle : pressure drop in straight pipes, bends / valves...etc... and total pressure drop
2. Calculation tools - Free Excel calculators

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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 due to piping singularities

and

Total pressure drop

ΔP_T=ΔP_f+ΔPS

f/2=friction factor, f is Fanning friction factor
D_H=Hydraulic diameter in m
u_m=mean velocity in m/s
ΔP_f=pressure drop due to friction in Pa
L=length of pipe in m
ρ=specific gravity in kg/m3
ΔH_s=pressure drop due to pipe singularity in m
ΔP_s=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

Warning : this calculator is provided to illustrate the concepts mentioned in this webpage, it is not intended for detail design. It is not a commercial product, no guarantee is given on the results. Please consult a reputable designer for all detail design you may need.