Question

A 6 inch pipe is 400 ft long and carries water with a flow of 600 US gpm (gallons per min). Find the loss of head due to friction in the pipe expressed in psi.

I think I'm supposed to use

\(H=f*\dfrac{L}{d}*\dfrac{v^2}{2g}\)

but i don't know how to find the friction, f. Any ideas?

Answer 1

Friction factors are normally available as charts with dimensionless pressure drop as a function of Reynolds number (rho)(v)(D)/(mu). See fluid mech or chem eng books.

Answer 2

okay, thanks a lot.

Answer 3

Glad to be of some help. Best.

Answer 4

cheers