Pipe Headloss : Colebrook White Formula
The Darcy Weisbach Equation for calculating the pipe losses is as below;
In the Darcy–Weisbach Equation, the friction factor f can be calculated from the equation of Colebrook–White.
where k is the absolute roughness of the pipe wall (mm), D the inner diameter of the pipe (mm) and Re the Reynolds number .
Pipe Roughness values are as follows;
Roughness Value (mm)
|Mettalic Pipes - Cast Iron and Ductile Iron||0.15|
|Mettalic Pipes - Mild Steel||0.06|
|Asbestos Cement, Cement Concrete, Cement Mortar or Epoxy Lined Steel, CI, DI Pipes||0.035||0.035|
|PVC, GRP, and other plastic pipes||0.003||0.003|