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A water system has a pump that delivers 500(m^(3))/(h) at a rotational speed of 1200rpm and 80 percent efficiency. The pump operates at an elevation
A water system has a pump that delivers
500(m^(3))/(h)
at a rotational speed of
1200rpm
and 80 percent efficiency. The pump operates at an elevation of
1000m
above sea level (use an atmospheric pressure head of
9.19m
) and the temperature is
20\\\\deg C
. The total dynamic head is
40m
and the pump manufacturer's required net positive suction head is
NPSH_(R)=5
. What is the allowable suction head for the pump? The vapor-pressure head at
20\\\\deg C
is
0.25m
, the entrance loss is
0.0001m
, the bend losses add up to
0.17m
and the sum of head losses due to friction in the suction piping is
1.1m
.
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