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use
1-hazen waliem equation.
2-use Darcy equation .
friction loss can be estimated using Emperical Hazen williams equation
By fluid type and piping surface chart
Add to the answers COLBROOK Formula
the simplest method for calculating frictional lose in piping by using Darcy's equation,
. there are many online calculators are also available to help you out or you could even develop a simple excel sheet for the same. :)