1. Calculation principle

2. Calculation tools

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,

D

u

ΔP

L=length of pipe in m

ρ=specific gravity in kg/m3

ΔH

ΔP

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