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two stage pump help needed !!!

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Old   July 6, 2009, 01:53
Default two stage pump help needed !!!
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Zvonko Kostovski
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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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Old   July 6, 2009, 04:55
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