Question

A pump is used to carry water (T =60 oF and ν = 1.217×10-5 ft2/s) from a large tank (elevation of surface = 30 ft and at atmospheric pressure) through a pipe to the exit (elevation 60 ft) at a rate Q = 1.5 cfs as shown below. The pipe is made of cast iron (ε = 0.00085 ft). The pipe segment before the pump has length L = 500 ft (three horizontal sections of 160 ft each and two vertical sections of 10 ft each) and diameter D =6 inch. For the segment after the pump L = 1200 ft and D =6 inch. Ignore all local losses.

a) What is the friction factor f?

b) What power needs to be delivered by the pump in hP?

Answer 1