Question

A single-acting reciprocating pump has a stroke length of 37.5 cm and a cylinder diameter of 22.5 cm. The suction pipe is 12 m long and has a diameter of 15 cm. The water level in the sump is 3.0 m below the centre of the pump. If the speed of the pump is 20 rpm, determine pressure head on the piston at the beginning of the stroke (a) when there is no air vessel in the suction pipe, and (b) when an air vessel is fitted to the suction pipe at the level of the cylinder and at a distance of 1.5 m from the cylinder. Take Darcy–Weisbach friction factor f = 0.02.​

Answer 1

Explanation:

A single-acting reciprocating pump has a stroke length of 37.5 cm and a cylinder diameter of 22.5 cm. The suction pipe is 12 m long and has a diameter of 15 cm. The water level in the sump is 3.0 m below the centre of the pump. If the speed of the pump is 20 rpm, determine pressure head on the piston at the beginning of the stroke (a) when there is no air vessel in the suction pipe, and (b) when an air vessel is fitted to the suction pipe at the level of the cylinder and at a distance of 1.5 m from the cylinder. Take Darcy–Weisbach friction factor f = 0.02.

Answer 2

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