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Sealing of ButtWeld ends for Cryo-Testing of Valves

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NGiLuzzu

Mechanical
Dec 17, 2002
558
Dear All,
I would like to know if anybody has ever faced the problem in object.

Having to perform cryogenic tests on butt-welding valves, it is not easy to obtain a good sealing of the test caps, due to the particular shape of the ends...

Is it possible to have, somehow, a good (flat) sealing surface, on which the gasket can be centered and compressed properly?
In addition to this, what kind of material would you use (see also Thread408-82258)?

Thanks and Regards, 'NGL
 
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