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Pipe friction head loss

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Pipe friction head is the amount of energy loss due to friction of the fluid moving through pipes and fittings. It takes a force to move the fluid against friction, in the same way that a force is required to lift a weight.

For straight pipes:

 
 pv = Pressure loss
l = Pipe roughness 
D = Diameter of the pipe 
L = Length of the pipe 
r = Density of liquid
v = Velocity of flow

 

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