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Need help determining what size diameter for some pipe. I just want someone to check my calculations, hopefully they're okay. I attached a quick sketch of the set up.

Here are the knowns:

Qmin = 4000gpm

ΔP = 32psi

L = 65ft

e(roughness of commercial steel pipe) = 0.00015ft

water properties:

ν = 1.08x10-5 ft^2/s

ρ = 1.94 slug/ft^3

Is it safe to assume since the discharge is below the source we can ignore the height change it and just pretend its a horizontal pipe?

Take a look at my calculations in the excel sheet I attached. The first tab is an estimation for the diameter, the 2nd tab is sort of a recheck, estimating Flow given diameter.

Thanks!

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# Pipe design help. Know Q and ΔP, need to find D

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