Question

In: Mechanical Engineering

A centrifugal pump is driven at 1300 rpm by a 10 hp motor and delivers 250...

A centrifugal pump is driven at 1300 rpm by a 10 hp motor and delivers 250 GPM at 85 Fahrenheit water against 75 ft water head, assuming that the initial pump efficiency is 65 % doesn’t vary appreciably the maximum flow the pump can deliver is most nearly

Expert Solution

According to question

Temperature of water= 85F

on checking density of water at this temperature

now

=62.170x32.174x75

=223.252 KPa

now,

Power given by motor =10hp

but, we require to calculate pump pwer as the discharge is carrying out through pump power,

so,

Q=250GPM H=75ft so, WHP= 4.73 hp

We require Break Horse Power to calculate the max discharge

so

BHP= 7.284 hp

final formula becomes

Power drawn through pump (BHP) = [ Qmax * P ]

on putting above values we get

Q(max) = 326.2 GPM

(Here, Net torque given by the pump is not given, so we consider Net power produced by the motor to evaluate maximum flow through pump )

samet mamat answered 2 years ago

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