How to determine NPSHa for two pump in parallel
How to determine NPSHa for two pump in parallel
(OP)
Hi, Can you please advise on how to calculate the head losses for two centrifugal pump connected in parallel to a common suction line? And also the NPSHa for the pump. The flow rate require is 500 liters/sec and the pump is 100m away from a reservior 5 m above the pump. The water is pump to two tanks one 200m away at 30m and the other 300m away at 50m. Currently the selected suction pipe size is 500mm. Thanks.
Regards,
417
Regards,
417





RE: How to determine NPSHa for two pump in parallel
Remember that the NPSHr is more critical with a single boiling point fluid (like water) than it is with a multi-boiling point fluid (like oil), as cavitation will come on very quickly with single boiling point fluids, and slowly with multi boiling point fluids.
RE: How to determine NPSHa for two pump in parallel
If the later is the case, line suction line size need to be sized for both pumps are running, ie suction line need to be sized for 1000 l/s (1 m3/s). And the pressure drop shall be sized accordingly.
Thanks
rusman
Senior Process Engineer
Kuala Lumpur, Malaysia
man@rwsb.po.my
RE: How to determine NPSHa for two pump in parallel