Answer to Question #113379 in Mechanical Engineering for Jayapal Reddy

Question #113379
A centrifugal water pump operates at 30 m3/hr and at 1440 RPM.The pump operating efficiency is 65% and motor efficiency is 89%.The discharge pressure gauge shows 3.4 kg/cm2.The suction is 3mtr below the pump centreline.If the speed of the pump is reduced by 25%, estimate pump flow, head and motor power.Assume motor and pump efficiency remains same at the reduced speed.
1
Expert's answer
2020-05-03T15:27:15-0400

We know that, The relation between pump efficiency and motor efficiency as

pump efficiency= 65 % and motor efficiency = 89 %, N=1440 rpm,




P= 423.5 Pa and as per question , N 1440 -

we know that



P2=


and head is proportional to speed square





Q_2=




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