Why does a water pump becomes ineffective, when water ha to
be raised through a height grater than 30 ft. ?
Answer Posted / arun k s
This is true in the case of a suction pump. In a suction
pump, air is being sucked from the suction pipe by the
pump. Thus the pressure inside the suction pipe reaches
nearly zero but the pressure outside the pipe will be
atmospheric. Thus the higher outside pressure make the
water to rush into the pipe until the pressure developed by
the inside water colomn balances with the atmospheric
pressure.For water, the height reqd. to develop atm.
pressure is 10m (34ft.). You cant lift water beyond that
level using atmospheric pressure.
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