Sawsan311
Chemical
- Jun 21, 2019
- 303
Dear All,
for a system which has a specific design pressure limit and requires revamp with a new pumping system. Do you agree that selecting the pump's impeller size wand hence selecting smaller multiple pump's capacity to achieve the total target demand would contribute in limiting the shut off head of the system. In other words, for a VFD driven large pump, going to high speed range up to an increased capacity per pump (and hence less number of installed pump) would force the system to exhibit higher head towards shutoff and accordingly limit the application of such less number of large pumps to an existing system.
Do you agree that I would rather install smaller capacity multiple pumps which will operate over a smaller rpm range such that HxN2 would be less. Bearing in mind that I still have to fulfill the minimum head to rise to shut off of 10% for pump operating in parallel as per API 610.
thanks
regards,
for a system which has a specific design pressure limit and requires revamp with a new pumping system. Do you agree that selecting the pump's impeller size wand hence selecting smaller multiple pump's capacity to achieve the total target demand would contribute in limiting the shut off head of the system. In other words, for a VFD driven large pump, going to high speed range up to an increased capacity per pump (and hence less number of installed pump) would force the system to exhibit higher head towards shutoff and accordingly limit the application of such less number of large pumps to an existing system.
Do you agree that I would rather install smaller capacity multiple pumps which will operate over a smaller rpm range such that HxN2 would be less. Bearing in mind that I still have to fulfill the minimum head to rise to shut off of 10% for pump operating in parallel as per API 610.
thanks
regards,