I'm working on specifying a pump to transfer LPG from storage offsite. The thing that I noticed is that the NPSHA that I'm coming up with is extremly low. Infact, it is negative. I've scanned a specsheet for another pump in similar service and I noticed that it was specified with a NPSHA of 0. The NPSHR under the performance data is -2. I've never heard of negative NPSHA or NPSHR before. I was hoping that someone could advise if it is acceptable to specify negative NPSHA which would in turn require a negative NPSHR. If so, what is the practical limit before I play games like placing the pump below grade etc. to overcome this issue?
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