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Posted by Purge Complete on April 28, 2005 at 23:47:31:
In Reply to: Re: mechanical seal problem posted by Mikey on April 26, 2005 at 08:14:25:
: : The jelly substance may be amines in the treated water depositing on he seal face, and that might destroy the seals.
: : : Could you have contaminated condensate returns ? Any other changes in the plant other than just the change of the feedpumps ?
: : : Boiler Guy
: : :
: : : : Our plant was just renovated back in 2002. They replaced our old centrifugal feed pumps with Goulds pumps with mechanical seals. All 4 pumps have had the mechanical seals replaced twice. Each time under warranty. The company has sent reps out to find out what the problem is and can't find an answer. They said there was a JELLY like substance maybe causing the problem. Our feedwater is clean and we have no jelly like substance anywhere else in the plant. We just lost 2 more mechanical seals. They were put in by the company. This time they took it to the factory and said granules so small they would fit in the lines in your hand is causing the seals to fail. You can't see them to the naked eye. Is there feedwater anywhere that is completely pure of any type of silica or dirt. There are strainers in line before the pump. It sounds to me like a bad product and I'm getting a bunch of smoke blown my way. These are feedwater pumps, I don't think a granule of something I can't see should be causing a failure. Has anybody seen this problem before.
: Gould's rep's are notorious for specing the wrong application- Check into it for yourself...you may find it to be a wrong application.
: Do you have low level pump protection if your feedtank goes empty? Also if temp of water is too hot and flashes inside the pump this will cause it to run dry. Both will cause seal failures.
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