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  1. #1
    Captain Potter
    Firehouse.com Guest

    Unhappy Mechanical Pump Seals

    We are having major problems with mechanical pump seals on our Waterous pumps. We have tried back flushing, flushing out cooling lines on a montly basis, having our water checked, and upgraded our pump coolers to 1/2" to keep sufficient water circulating. We have talked to factory, they claim we are the only ones having the problem. We are about to go broke fixing pump seals. Anybody have any suggestions?

    [This message has been edited by Captain Potter (edited October 31, 2000).]


  2. #2
    morriss
    Firehouse.com Guest

    Question

    What's your seal faces made out of? Carbon versus ???? We have not had any problems with mechanical seals. Do you have an overheating/cooling problem? Excessive trash in your tank/supply water? More information please.

  3. #3
    Captain Potter
    Firehouse.com Guest

    Post

    In answer to your question about excessive trash in our water/supply. No, we have had the water checked and we are extremely meticulous about back flushing our pumps. As far as overheating problems, the normal size of a pump recirculating line & valve is 3/8" and we made ours 1/2" increasing the cooling capacity. Waterous now admits that they do have a pump seal problem in the Desert southwest, we are currently researching on how to convert our mechanical seals back to grafoil packing. Seems like a lot of time & trouble. The seal surfaces are a carbon ring agains a polished stainless steel surface backed up by a spring that maintains pressure. There are lines that circulate water around the seals & to the pump drain where, if the drain is closed the water goes back into the intake side of the pump. Those lines are removed & blown out every 6 months like Waterous recommends.

    [This message has been edited by Captain Potter (edited October 31, 2000).]

  4. #4
    g david moose
    Firehouse.com Guest

    Post

    Capt.Potter,High intake pressures will affect seal life. Yes the pump can be converted back to packing.This will require replacing the impeller shaft and stuffing box ends. Minor plumbing will need to be done on the underside. You can pack a lot of pumps for the cost of a set of seals!

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