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Thread: Trouble rebuilding thomsen pump...

  1. #1
    Join Date
    Dec 2007
    Location
    Plattsburgh, NY USA
    Posts
    221

    Trouble rebuilding thomsen pump...

    Hello All
    I've recently tried to rebuild my thomsen #4 pump head and can't seem to get it to not leak. At first it holds but after a CIP or two and then when I get to product movement the leaking begins (of course!). As far as I understand I'm replacing the orings and gaskets properly, with the proper material. The metal in the pump doesn't look worn anywhere to make me think there is something wrong there. Has anyone had the same sort of problem when rebuilding these seemingly simple pump heads? Any help would be much appreciated...
    Cheers
    Jay Stoyanoff
    Brewmaster
    Plattsburgh Brewing Co.
    Plattsburgh, NY

  2. #2
    Join Date
    Jan 2006
    Location
    Ponderay, Idaho
    Posts
    230
    Jay
    is it an internal or external seal pump the number 4 comes in both

    Fred
    Laughing Dog

  3. #3
    Join Date
    Dec 2007
    Location
    Plattsburgh, NY USA
    Posts
    221

    it is...

    an internal seal kit. I basically just replaced each oring, gasket and snap ring with an exact match. It seemed right, except for the fact it quickly leaks. Any thoughts?
    Thanks
    Jay Stoyanoff
    Brewmaster
    Plattsburgh Brewing Co.
    Plattsburgh, NY

  4. #4
    Join Date
    Jan 2006
    Location
    Ponderay, Idaho
    Posts
    230
    Jay
    mine are external check that your shaft that holds the impeller is set correctly if it is not you dont have the pressure against the seal and they leak

    Fred

  5. #5
    Join Date
    Dec 2007
    Location
    Plattsburgh, NY USA
    Posts
    221

    hmmm...

    Now that sounds like whats going on...I'll check it out tomorrow AM and let you know. Thanks for the advice
    Cheers
    Jay Stoyanoff
    Brewmaster
    Plattsburgh Brewing Co.
    Plattsburgh, NY

  6. #6
    Join Date
    Mar 2003
    Location
    Nashville
    Posts
    691
    Also, check the condition of the back plate where the ceramic seal presses against. They get scored up and will leak, plus eat up your seal in no time. There is plenty of steel on this plate, and you can take it down to a machine shop and have them machine it flat again for a few bucks or cases of lowfills. The seals will last much longer if you do this.
    Linus Hall
    Yazoo Brewing
    Nashville, TN
    [url]www.yazoobrew.com[/url]

  7. #7
    Join Date
    Jan 2003
    Location
    Palau
    Posts
    1,611
    And not just elastomers, but also the pump seal proper should be replaced. Maybe as often as once a year. Use a very thin film of food grease like Petro-gel on the o-rings to effect a very tight seal, and prevent dry bunching of the o-rings.
    Phillip Kelm--Palau Brewing Company Manager--
    Worldwide Brewery Installations
    www.GitcheGumeeBreweryServices.com

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