Pipe friction head loss
| 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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