QUESTION 18

Calculate the power supplied to the pump shown in below if its efficiency is 76 percent. Methyl

alcohol at 25°C (p = 789, μ = 547 x 10-6Pa s) is flowing at the rate of 50 L/s. The suction line

has a diameter of 100 mm and is 15 m long steel pipe. The discharge line is 115 mm diameter steel

pipe in the discharge line is 200 m. The roughness of steel pipe is € = 0.06 mm. Assume that the

entrance from reservoir 1 is through a square-edged inlet (K₁ = 0.5) and that the elbows (K₁ = 0.3)

are standard, the valve is a fully open globe valve (K₁ = 10) and the exit has a loss coefficient of

K₁ = 1). Reservoir 1 is 15 m below Reservoir 2.

(10 marks)

Suction line

Pump

Valve

Discharge line

Flow