Pressure drop

1. Equation
Hydraulic calculation is based on Darcy-Weisbach’s and Prandtl-
Colebrook's equation for flow in totally fulfilled pipe.
Darcy-Weisbach’s expression for calculating the waste in energy
line along pipe because of friction is:
where is:
Hfr – loss in elevation because of friction
L – pipe length
(lambda) - friction coefficient
D – inner pipe diameter (m)
v – average velocity in pipe (m/s)
g – gravity acceleration (m/s2)

2. Thank You