I have updated this question with additional detail - it is not a high-pressure steam environment; it only operates at 115 PSI.
Apologies if this is off-topic here. It's less "home improvement", more "industrial breakdown", but the subject is pipework which may be similar to what this site covers - I'm hoping a steam pipe expert might see this here. Reading the "what's on topic" page though, and based on the plumbing tag, I think it's on-topic, but I have also posted it to Engineering.SE as was suggested.
A friend of mine that doesn't use the internet much runs a commercial laundry. They use an old 'Manlove Tullis' laundry calendar (c. 1980) that looks like this:
(click to enlarge)
I couldn't even find any photos on Google Images of a roller iron of this type/age; I had to dig through some photos of his factory I had.
Essentially, it is a machine with 3 rollers (2 visible in the photo) on a hot plate. Garments (e.g. bedsheets) go in wet, and come out ironed flat, and dry.
The hot bed runs on steam fed by 6 pipes (2 for each roller) underneath the machine, coming from a big boiler.
A couple of days ago 1 of the pipes broke off/burst under the machine with wear & tear over the years; where the pipe is joined by a coupling to the hot bed.
It is possible that over the years with repeated super-heating and cooling some metal fatigue has crept in, or it became so brittle that it finally failed.
After allowing the machine and the pipes to cool down for a day, he went under the machine to try to fix it; but the pipe is seized to the [possibly brass] coupling. The coupling affixes to the hot bed and it appears it cannot be removed because it is both seized and in an inaccessible part of the machine. It is a 22mm coupling.
The pipe is steel, and could be cut off and a new one joined by welding it or something, but because the working area is only 50cm in height at most, and the machine is 10ft x 15ft / 3m x 5m, there are some health & safety issues with operating a welding torch under there.
An additional coupling could be added, but this introduces another mode of failure.
He has just installed a copper stop end, temporarily, in the hope that it will be possible to use the machine with 2 out of 3 rollers functional come Tuesday.
The boiler operates at 8 Bar / 115 PSI — therefore the laundry calendar also operates at 115 PSI. From reading online I understand that the pipework is more than adequate. It is also regularly inspected and serviced.
My question is:
How can we get this pipe off and a new one on? Any above-board temporary fixes would also be of interest.
The person I'm posting this question for is extremely knowledgeable on the subject, but for the first time I've seen, he's stuck here. His usual engineer doesn't know either.
I've found the phone number for 2 companies that could possibly help, but it's currently a long weekend in the UK, bank holiday Monday coming up... He has called a specialist commercial laundry engineer but he unfortunately doesn't have any parts for Manlove Tullis machines.
He's given him a phone number for another engineer that might be able to give him some advice, but he can't call him til Tuesday when businesses reopen. He is also some distance from us.
Another engineer he has spoken to has said that it either needs to be welded or a proper coupling added; but it cannot be cut off because it is inaccessible.
Are there any plumbing / steam engineering experts on here that can help? I'll offer +100 bounty when the option is available in 10 hours.
Also if a UK expert in laundry steam operations sees this and you think you can fix this on-site for him, this is something he is interested in. He understands there is a cost involved, but the machinery is currently down and needs urgently repairing.
I will attempt to get a photo of the seized pipe/coupling on Monday when I go to his factory; although he tells me I will struggle to get a photo.