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+Hot / Cold Insulation for Expansion Bellows?

+Hot / Cold Insulation for Expansion Bellows?

+Hot / Cold Insulation for Expansion Bellows?

(OP)
Dear colleagues:

We have been asked to develop details for insulating expansion bellows for one of our clients.

The hot service expansion bellows seems to be easier to solve, you can even find providers who supplies some kind of covers for that purpose.

The more difficult solution is for the cryogenic services where the insulation is solid (polyurethane).

If someone have a past similar experience or any information/suggestion about a detail or a provider Please let me know.

Regards,
Hansito
 

RE: +Hot / Cold Insulation for Expansion Bellows?

I found (and attached below) a NASA document related to your problem;- I believe however, that your problem can be solved with a second bellow welded to the ends of pipe(s), larger ID by 50% and vacuum the space in between, to minimize the heat transfer. Obviously, the thinnest bellow material to resist the ambient corrosion and the vacuum. I would weld two rings of sufficient thickness to the pipe ends and weld the new bellow on these supports to create a vacuum insulating chamber around the inner bellows. You can use now some standard flexi insulation material for the external below or leave it completely exposed to prevent CUI.
Howzat?
Cheers,
gr2vessels

RE: +Hot / Cold Insulation for Expansion Bellows?

(OP)
Thank you very much gr2vessels

I appreciated the pfd very much and also your suggestion.
For the cryogenic case I believe that we may have Ice formed on from the welded rings that you mentioned, and passing to the outer bellow. It can be a good idea anyawy and I will think about it.

Regards,
Hansito

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