Water has to be supplied to a town with one lakh population at the rate of 150 liters per capita per day from a river1.8 km away the difference in elevation between the lowest water level in the sump and service reservoir is 36mdetermine the size of the main and the horse power required assume suitable data where necessary.
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3
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5
Answer:
= 289.12 BHP.
Explanation:
Sol: Avg. Water Demand = 100000 x 150 = 15 MLD
Maximum Water Demand = 1.5 x 15 = 22.5 MLD
Max. Discharge Required, Q = (22.5 x 106 ) / (103 x 8 x 60 x 60) = 0.7812 m3 /s
A = ( Q / v) :- ( ∏ / 4 ) x d2 = ( 0.7812 / 2.4 ) d = 0.644m
HL = (f x L x V2) / (2 x g x d)
HL = (0.0075 x 2000 x 2.42) / (2 x 9.81 x 0.644) = 27.36
Required lift head between sump and reservoir = 36 m
Total Head Against which pump has to work = 36 + 27.36 = 63.36m
Brake Horse Power = (γ_w x Q x H ) / (η x 0.745)
= (9.81 x 0.7812 x 63.36 ) / (0.8 x 0.745)
= 485.104 x 0.596
= 289.12 BHP.
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