two stage pump help needed !!! -- CFD Online Discussion Forums

July 6, 2009, 01:53	two stage pump help needed !!!	#1
zona New Member Zvonko Kostovski Join Date: Apr 2009 Location: Skopje, Macedonia Posts: 13 Rep Power: 17	Hi I was calculating a vertical pump, and the result is OK but when I tray to calculate two stage pump (with same impeller and difusor) the result is apsurd Head is -5m !!! and efficiency around 70% ( for single stage head is 17m efficiency 85%), any ideas what I'm doing wrong

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