Pump temperature?

Discussion in 'Irrigation' started by mx315, Sep 23, 2009.

  1. hamham

    hamham LawnSite Member
    Messages: 62

    I’ve seen motors at very low load (e.g. 10%) get hot because their efficiency drops like a stone and their power factor goes to crap. Also, incorrectly wired motors run hot, and motors with extra resistance because of really bad seals, alignment issues, or internal issues (including in the pump) can run hot. It would be good to start with the pump’s flow, pressure, voltage, current, and power factor data to make sure there isn’t an obvious pump or motor issue. If you’re off the pump curve or in the cavitation range then you know you need to change either the pump or piping system.

    But sure, you could go out there and start "trying stuff" until you get it working suitably. But wouldn’t it be better if you looked at the pump curve that you're dealing with so that you know ahead of time where the pump will operate comfortably and where it will not?
  2. mx315

    mx315 LawnSite Senior Member
    Messages: 394

    I did some thinking last night and that pressure seemed really high for a 1 hp pump, so I went by this morning and got the numbers off the pump. I caught the homeowner there and got him to shut the breaker off for the pump. I drained the pump and the pressure guage never went below 59 psi, so that pump is way off on the pressure. Should have known to look at that first but didn't know where the breaker was and assumed the guage was right... and we all know what they say about assuming things. You were dead on...New game plan

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