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chemengineer23
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Homework Statement
A centrifugal pump is used to pump water from one tank to another through 1000 equivalent ft of 4 in. schedule 40 steel pipe as shown in the figure. The second tank is located 25 ft above the first.
Show that the pressure drop (in psi) in the pipeline between 2 and 3 is given in terms of the flow rate Q (ft3/s) by:
p2 –p3 =10.83+10,265fQ2 where f is the friction factor.
What is the pump power required if the flow rate is 0.2 ft3/s? (Assume negligible losses and elevation change in the suction line.)
Point 1 is where the level of water is in the first tank
Point 2 is right after the pump
Point 3 is where the level of water is in the second tank
Homework Equations
MEB: V^2/2 + P1/rho +gz1 + Ws = V^2/2 +P2/rho + gz2 +hf
hf=( 2*f*L)/D *V^2/2
The Attempt at a Solution
Delta P/rho= g(z3-z2)-V2^2/2+hf
but you don't know delta z, velocity or the L in hf