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Thread: Normal noise level of pump....

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    Join Date
    Feb 2009
    Location
    College Station, Texas USA
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    30

    Normal noise level of pump....

    My Northstar pump periodically seems to have an increase in the decibel level of it's background noise level. I can only describe it as follows: its louder than normal, and seems "coarser", not as smooth, as if there is some air or other material slogging around in there to make it louder. Also, I have this curious observation - if I apply backpressure on the system (on the order of 2 psi), by slightly closing the valve to the pool return jets, the pump gets quieter, more like the normal level of background noise from the pump.

    Any thoughts on this and whether it represents some sort of problem? Has anyone else experienced this?
    Location: College Station, Texas
    9K gal in-ground plaster pool
    Hayward ProGrid D.E. 2420 Filter
    Hayward Northstar Series 1HP Pump/Motor
    Stenner 3 GPD bleach pump and Pentair 320 Inline Chlorinator

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
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    8,619

    Re: Normal noise level of pump....

    It could be that the water flow into the pump is slightly restricted. Closing the valve to the returns reduces the flow out of the pump allowing the suction-side plumbing to supply enough water to the pump. Is everything clear and open on the inlet side (skimmers and drains)?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: Normal noise level of pump....

    Quote Originally Posted by JohnT
    It could be that the water flow into the pump is slightly restricted. Closing the valve to the returns reduces the flow out of the pump allowing the suction-side plumbing to supply enough water to the pump. Is everything clear and open on the inlet side (skimmers and drains)?
    Mine gets a little louder when the vacuum is engaged and gets much quiter when solar is engaged. For most pumps, when the vacuum gets high compared to the return pressure, the pump gets louder. When the vacuum is lower or return has higher pressure, the pump will get quiter.

    Sometimes too when the head loss is very low on both the return and suction, flow rates can get quite high which can also cause a loud pump.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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