A pump draws water from a sump and delivers it to an open tank through 210 ft of 2-in schedule 40 steel pipe. The vertical suction line is composed of 3-in schedule 40 steel pipe and is 5 ft long. The suction line includes a foot value with hinged disk and a 90° degree standard elbow. The discharge line includes two 90°degree standard elbows, an angle lift check valve and a fully open gate valve. The design flow rate is 250 gpm. Find the head losses in the suction and discharge lines. Calculate the NPSHA. Select a pump suitable for this application.
1) Setup the generalized energy equation between a point on the surface of the water in the sump (Elev 24 ft) and a point at the inlet of the pump (Elev 28.62 ft). Solve for the pressure head at the inlet. Include entrance losses, friction from the 5 feet of straight pipe, and minor losses from the foot valve and elbow.
2) Find the stagnation pressure at the inlet of the pump and compute the NPSHA.
