Fluid head resistance can be calculated by using the Darcy-Weisbach formula.

h fluid = f (L/D) x (v ²/2g)


f = friction factor

L = length of pipework

D = inner diameter of pipework

v = velocity of fluid

g = acceleration due to gravity


Fluid head loss calculated by Pipe Flow Expert when using the non-compressible calculation engine is based on the Darcy-Weisbach formula.