A multistage pump is required to deliver water to a head of 50 m at flow rate of 0.1 m^3/s. A motor rotating at 1800 rpm is avai
lable. Determine the optimal number of stages for the pump.
1 answer:
Answer:
number of stages for the pump is 4
Explanation:
given data
water head Hm = 50 m
flow rate r = 0.1 m³/s
rotating N = 1800 rpm
to find out
optimal number of stages for the pump.
solution
we consider here specific speed does not exceed more than 82
so Ns formula will be
Ns =
here Ns id 82 and N is rotating and r is flow rate
so
82 =
so H = 13.23 m
so
number of stage n is
nH = Hm
n =
n = 3.77 ≈ 4
so number of stages for the pump is 4
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