Bilge Pump Problem

Discussion in 'Boat Design' started by steve123, Feb 2, 2015.

  1. steve123
    Joined: Dec 2014
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    Location: China

    steve123 Junior Member

    Hi,
    Anyone come across this problem...Large Bilge pump self priming centrafugal runs fine until its actually pumping water then it vibrates like hell !!!!
     
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    It could be a number of things. For example, it can be sucking air, the impeller may be loose, worn bearings.
     
  3. steve123
    Joined: Dec 2014
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    steve123 Junior Member

    There are 8 of these pumps on the boat, they are all brand new and 7 have this problem.
     
  4. gonzo
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    gonzo Senior Member

    What does the manufacturer say? I assume there is some kind of warranty.
     
  5. michael pierzga
    Joined: Dec 2008
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    michael pierzga Senior Member

    Sounds like air. Some vane segments are full of water , some vanes full of air .
     
  6. gwboats
    Joined: Sep 2005
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    gwboats Naval Architect

    Bilge Pumps

    If it is not a motor problem (rotor balance, electrical phase balance) then my guess is cavitation. Do the pumps have any sharp bends just before the inlet - these can cause flow problems. Best to fit a straight run into the pump of say length = to 8 to 10 pipe diameters.

    Cheers
     
  7. Poida
    Joined: Apr 2006
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    Poida Senior Member

    Post a pic of the set up.

    Poida
     
  8. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    What type of piping, how much "lift", pipe diameter?
     
  9. Kailani
    Joined: Apr 2013
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    Kailani Senior Member

    You didn't say what brand the bilge pumps are.
     

  10. kapnD
    Joined: Jan 2003
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    Location: hawaii, usa

    kapnD Senior Member

    Eight large bilge pumps?
    I'd say your problem is not with the pumps, but with the leaks in the hull!
    I have seen shaft corrosion issues on some submersible pumps that caused weakening and resulted in severe vibration, eventually breaking clear off.
    If they are controlled by a float switch, the "off" level may need to be adjusted so that it shuts off before it sucks air, which could cause vibration.
     
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