 # Pipe pressure drop calculation and Excel tools

## Pressure drop calculation methodology and free Excel calculation tools

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

## 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

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