Moody diagram (friction factor) 
1. IntroductionThe friction factor is used to calculate the pressure drop
due to the flow of a fluid in a pipe. It represents the
interaction in between the fluid and the pipe. There are
different ways to calculate it, one can be graphical,
using a Moody graph. Note that the friction factor used here is
Darcy (also called DarcyWesibach or Moody) friction
factor. 2. DiagramThis diagram has been generated using Churchill correlation.If one wants to calculate the Fanning friction factor, the results of this graph must be divided by 4. Source file  Image  Excel sheet
