Backwash water pipe shall carry the wash water from back wash pumps to the filter beds. Only one filter bed shall be backwashed at a time:
Proposed Diameter of pipe = 18 “ i/d
X - sectional area of pipe = 1.77 Sft
Velocity = 14/2
= 7 Ft /s
It is proposed to install 18 “ dia MS pipe along the filter beds in the Pipe Gallery to carry wash water from backwash pumps to each filter bed.
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