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Thread: Bolts for oil-filled transformer

  1. #11
    Join Date
    Sep 2013
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    Quote Originally Posted by MAC702 View Post
    Leaking car is the best...for a car mechanic

  2. #12
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    Sep 2013
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    Quote Originally Posted by FionaZuppa View Post
    it could just be improper torq on those bolts. apply proper torq spec and see if it tightens any. if not then it would suggest the seal has an issue in some way and oil is making its way to the threading and oozing to the outside.
    It's a shipboard HV xformer, so when ship rolls, oil reaches the gasket level. Then nitrogen pressure comes into effect. Nitrogen eventually finds way out and drives some oil along the way thru any imperfections in gasket. The original design didn't include pressurization with inert gas, by the way. All torques were tried before. We have a company, they claim their sealant will stop such oil buildup. We'll see.

  3. #13
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    May 2014
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    AZ
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    Quote Originally Posted by moonshineJ View Post
    It's a shipboard HV xformer, so when ship rolls, oil reaches the gasket level. Then nitrogen pressure comes into effect. Nitrogen eventually finds way out and drives some oil along the way thru any imperfections in gasket. The original design didn't include pressurization with inert gas, by the way. All torques were tried before. We have a company, they claim their sealant will stop such oil buildup. We'll see.
    well, given the application, have at it, no more leaks


  4. #14
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    Jul 2013
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    Resting under the Major Oak UK
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    So you’ve altered the original design by introducing pressurised nitrogen blanketing and you’re now wondering why the top gasket leaks?

    I would suggest a new cork top gasket coated with Blue Hylomar Gasket Compound before you set sail again.
    The reports of my death are greatly exaggerated.

  5. #15
    Join Date
    Mar 2008
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    Michigan. It's a beautiful penninsula, I've looked around.
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    Quote Originally Posted by Tony S View Post
    So you’ve altered the original design by introducing pressurised nitrogen blanketing and you’re now wondering why the top gasket leaks?

    I would suggest a new cork top gasket coated with Blue Hylomar Gasket Compound before you set sail again.
    Torquing the bolts in the proper sequence is crucial when sealing leaks is required. On a cover like that, the sequence will be a bit complicated. Probably a strange pattern jumping all over the place done in several steps. If such a sequence isn't followed, the gasket can bunch up between some bolts and stretch out between others.

    The problem is that the manufacturer is the one that designs the patterns and sequences. If this was not meant to be pressurized, they probably won't have the info you need.
    Cheers and Stay Safe,

    Marky the Sparky

  6. #16
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    May 2014
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    or, just stock up before sailing, make it a daily or weekly task


  7. #17
    Join Date
    Oct 2014
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    Charlotte, NC
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    I'm not sure there is anything you can do. You can try a neoprene gasket and sealer. You could also try painting between the nut, bolt, and flange but, I think the increased hydrostatic pressure from the ship roll is gonna force it to leak. The only sure way to solve the problem is to switch the xfmr to a dry cast. I guarantee it won't leak if you do that!

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