Replacing 2 inch cast-iron heating sweep bend fitting( in subfloor )

[P4fal]

Hi guys
Does anybody know the best way to replace this sweep bend pipefitting it is approximately 50 to 60 mm across the diameter of the bear pipework , When measured, problem is this is cast-iron Central heating pipework buried below a sub floor in a rather large early 1900s house
The corroded bend appears to have a threded Coupling on either end, removing the existing bend is probably doable but replacing it with a new fitting looks a bit tricky, please have a look at the photographs let me know if you have any good suggestions ( heating is already drained down )
Thanks guys

 

[ShaunCorbs]

Chase more of the floor and cut and thread further back and use a union one side but be warned it might be pined holed/ thin in places

 

[PlumbBobBob]

you only need to post in one sub forum.

 

[jonnyswamp]

Looks like 1 1/2 iron to me
If it were me, I'd cut out the bend and couplers and use 2 mechanical connectors and a new bend
I can't remember the name of the fittings, but they clamp around the pipe
Wouldn't want to put any more stress on the pipes by using a threader, as they may well leak elsewhere

 

[snowhead]

Check size here, cut a U shape in a piece of cardboard to make a gauge;

[DLMURL="http://www.floconfilters.com/technical.php"]Flocon Filters[/DLMURL]

No thread fittings;

PRIMOFIT cast iron compression fittings | George Fischer Sales | ESI Enviropro

 

[Gasmk1]

Check size here, cut a U shape in a piece of cardboard to make a gauge;

[DLMURL="http://www.floconfilters.com/technical.php"]Flocon Filters[/DLMURL]

No thread fittings;

PRIMOFIT cast iron compression fittings | George Fischer Sales | ESI Enviropro

think we used to call them johnson couplings at british gas

 

[snowhead]

Like this;

Johnson Type Steel Cap Stop End 3/4" Primofit for Steel & PE Pipe | eBay

 

[P4fal]

Thanks for the replying Guys
We decided to remove the 2" iron sweep bend attach 2x 2 inch male iron to compression couplings and then make our own bend in 2 inch copper and attach ,( leaving the two existing 2 inch iron Copling is in place on the original pipework, just had to use a little bit of heat and gentle persuasion of the joints