A 40 liters/second pump is required to deliver water to the top of a cooling tower with the manometric head at 19 meters

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A 40 Liters Second Pump Is Required To Deliver Water To The Top Of A Cooling Tower With The Manometric Head At 19 Meters 1 (192.1 KiB) Viewed 16 times

A 40 liters/second pump is required to deliver water to the top of a cooling tower with the manometric head at 19 meters. A radial centrifugal pump was selected to develop the required manometric head, assume the eye diameter equal to the inlet diameter, the hub diameter DH = 7 cm, the water velocity in the suction pipe Vo = 4 m/s. The contraction ratios at inlet and exit e1, e2 = 0.9, the pressure coefficient $ = 1.08, the flow coefficient Y = 0.21, the vane outlet angle b2 = 158°, impeller tip width at inlet = 2.3 cm, the pump is direct driven by an electric motor at a speed of 1,750 rpm. Assuming radial flow at inlet, calculate the following: A) Approximate eye diameter, vane inlet angle b1. B) The Water Horsepower with the theoretical or virtual head developed, neglect all mechanical losses. 191'09' 17.32 159°18' 12.37 110°35' 47.52 229°20' 33.94 132*49' 24.25 C) With the circulatory flow coefficient, and the tangential component of the absolute velocity Cu2 (after the modern theory) at exit, find also the angle of deviation (neglect the hydraulic losses). 2°35' 4°08′ 3°15' O 2°11' 1°55' D) If the pump is placed 8 meters above the water level in the suction line, and assuming the losses equal to 2.5 meters, the vapour pressure equal to 0.5 m and the atmospheric pressure = 10.3 m. After calculating the NPSH to determine if pump cavitate, calculate the Thoma Cavitation factor, sc. 0.0263 0.0368 0.0721 0.1010 0.0515