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 cap a thin wall 0.620" pipe
Author: mlippman (MI)

Is there a fitting that is designed to be put on a pipe that's 0.620" OD, not 5/8" as is standard? The idea is to temporarily cap off a stainless hose nipple pipe with something rigid. Thuss we have a 0.620" OD pipe to seal ideally with a compression fitting to NPT and a cap. The 5/8" compression fitting does work but it's not made for this.

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 Re: cap a thin wall 0.620" pipe
Author: hj (AZ)

Whoever made the pipe should also make fittings for it, but it is NOT something that standard plumbing fittings would work on properly.

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 Re: cap a thin wall 0.620" pipe
Author: mlippman (MI)

The pipe is a hose nipple. We're trying to cap it with something rigid that's not permanent.

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 Re: cap a thin wall 0.620" pipe
Author: PlumberLoren (CA)

Are you referring to a barbed fitting as a hose nipple? Please clarify and state clearly what you are trying to do.

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 Re: cap a thin wall 0.620" pipe
Author: packy (MA)

is the pipe regular pipe wall or thin wall?
i ask because if it is thin (like copper tubing) you may be able to flare the end and use a flare plug ???

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 Re: cap a thin wall 0.620" pipe
Author: hj (AZ)

I get the impression this is a hose of some kind.

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 Re: cap a thin wall 0.620" pipe
Author: mlippman (MI)

This is straight thin wall tube with a dimple made for hose. The end of the pipe is a couple inches so we have used a 5/8" compression fitting and got it to seal. There's a concern that it will not last so we're trying to find a solution that we know will work. We have some that can not be modified so we can not flare or change the pipe. Compression is not ideal because the collar locks onto the pipe and may not come off.

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 Re: cap a thin wall 0.620" pipe
Author: mlippman (MI)

There was a rubber type cap on the end of the tube with a hose clamp and it failed. The leak caused damage so we're trying to come up with a solid end cap. The tube is straight with a dimple made for hose. Please read my other post. Thanks

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 Re: cap a thin wall 0.620" pipe
Author: steve (CA)

Maybe a Dressor style coupling, with a pipe stub and cap on the other end?

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 Re: cap a thin wall 0.620" pipe
Author: hj (AZ)

You have to find a 1/2" Qest compression fitting. They use a rubber cone washer to make the seal so it does not bond to the pipe.

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 Re: cap a thin wall 0.620" pipe
Author: packy (MA)

fine, as long as it doesn't blow off. may need a 'thrust block' to keep it on..

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 Thank you for your help :thumb:
Author: mlippman (MI)

Thank you for your help. I researched dresser couplings and that would be a perfect solution except that the smallest one I can find is for 1/2" pipe which has a pipe OD of 0.84". My 0.62" OD pipe is to small for this dresser coupling. I'm afraid this will not seal. It's OK because the problem was solved. We're able to replace the pipe if needed so it will be welded closed.



Edited 1 times.

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 Re: cap a thin wall 0.620" pipe
Author: steve (CA)

Google "DCB38 3/8" IPS 1/2" CTS BRASS DRESSER COUPLING".

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 Thanks for all the suggestions :clap:
Author: mlippman (MI)

Just wanted to close the loop on this. I wanted to know if there was something to cap off a 0.062" straight pipe. it turns out my pipe is standard wall thickness pipe for special purpose. It's made with a tight size restriction of 0.062" OD and 1/2" ID. Standard straight pipe has an OD tolerance of +/- 0.010". This means that a standard stock straight pipe of most kinds can have an OD of 0.635 to 0.615. The 5/8" OD of your straight pipe may not be 5/8". With this said, a compression fitting mad for 1/2" pipe is made to fit a pipe OD of 0.635" to 0.615". My pipe is 0.620" which falls into the range of a standard 1/2" pipe. I was able to use a standard compression fitting with my odd size pipe. Thanks for all the suggestions.



Edited 1 times.

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