Connecting wet copper pipe underfloor

[Pineman]

Had a radiator pipe corrode underfloor and need to replace the section. My preference would be to solder a new pipe in. However, the existing pipe is wet and I can't see any way to dry it. I've drained the system but the pipe still has water inside. There's no give in it so I can't drain the water backwards.

My question is, which type of joint is best to use in this situation using a copper pipe - compression or push-fit? If the latter then which sort? I've done compression joints before but not push-fit. Although I'm not keen on using either under the floor I don't see much choice. Which would be more reliable?

Access is very tight but I think I can get a couple of spanners in for a compression fitting.

Many thanks.

 

[DaleRCL]

What about wet vaccing it out. That's what I would try first before using compression or push fit.

 

[DP]

Question I would be asking is, why did the pipe corrode. Also, if no access to pipe, then solder connection is better. If pipe in screed, or in contact with foundation, then of course it will corrode unless suitable protection applied.

 

[Pineman]

Question I would be asking is, why did the pipe corrode.

That's been bothering me. No idea why. The pipes are lagged with some very old-looking cloth-type material surrounding what seems to be a plastic mesh.

It runs along the bottom of a joist but is also in contact with the ground in places so maybe that's the cause of the corrosion.

Thanks for your help.

 

[CBF]

it's called hair felt lagging

 

[calorific]

it's called hair felt lagging

whatever you do, keep a flame well away from this stuff!!