Large diameter pipe connection

[svouts]

I need to connect a 2.5 inches steel pipe to an 1 inch pipe. It is in tight space and has a wooden floor underneath, see the pictures.

I looked at electric pipe threader but they go up to 2 inches.

Any ideas as how to connect a reducer to the 2.5 inches pipe? What options do I have?

-Any threader that can do 2.5 inches?
-Pressure fit?
-Welding, like TIG welding?

 

[Paulg31]

What's the pipe for?

 

[svouts]

This is for central heating, radiators water circulation.
We change most pipes but this one we need to connect with the new pipes.

 

[Madrab]

This is for central heating, radiators water circulation

Are you sure it's for radiators ..... do you live in a warehouse?

If it is for radiators then a custom fit welded connection would probably be the best option.

 

[svouts]

Yes it is an old house that was converted to modern system with combi boiler but left some old pipes. To this one I have no access to change the whole of it. I need to fit a reducer from 2 1/2 inches to smaller diameter.

Welding looks a bit dodgy in the right space and the wooden flooring underneath.

 

[Madrab]

You have access to the other end I take it? Can't you just thread a new pipe through that one? You mention reducing to 1", you could possibly thread a 28mm plastic pipe through that size of pipe, length and numbers of tight bends dependent of course.

 

[JimCrow]

Primofit adaptor,
https://www.gfps.com/appgate/ecat/c...109980/109984/P121864/product.html#tabDetails

2 1/2" x 1" reducing bush,
https://www.bes.co.uk/hexagon-bush-2-1-2in-x-1in-m-x-f-black-8410

 

[svouts]

Primofit adaptor,
https://www.gfps.com/appgate/ecat/c...109980/109984/P121864/product.html#tabDetails

2 1/2" x 1" reducing bush,
https://www.bes.co.uk/hexagon-bush-2-1-2in-x-1in-m-x-f-black-8410

Great, many thanks!
That primofit adaptor will solve my problem, I may use it also for some smaller diameter pipes instead of rending an electric threading tool.

PS: the other option would be to destroy some of the recently new kitchen done by the previous owner and some basement walls underneath...