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Comment by jhallenworld

It seems like it would massively complicate heat exchanger repair..

I learned of an obscure tool recently- a roller tube expander. You use this to tight-fit a tube in a boiler's tube-sheet. So you can install or replace tubes in pressure vessels such as a boilers or heat exchangers. Check it out:

https://www.youtube.com/watch?v=u7UQKNapTBE

Failure:

https://youtu.be/HlXVP2HHTfo?t=696

Repair:

https://www.youtube.com/watch?v=7znd-hpy2Vc&t=708s

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