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Pressure lose due to friction

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Old   February 27, 2012, 05:28
Default Pressure lose due to friction
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How to calculate pr drop in pipe line?
let's take pipe 300mm and length 350m
Boundry condition:
Inlet pressure: 6bar
Medium : Air
i want to know outlet pressure drop: ..... ? bar

I've learn that

a) Pr.Drop=(4.f.L.V^2)/(2.g.D)

b) Pr.Drop=(f.L.V^2)/(2.g.D)

Which one i've to use to find outlet pressure drop? plz help me too urgent

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