Screw through pipe....Compression fitting tolerance ?

[Bowness72]

Hi there, yesterday I put a screw through an underfloor central heating pipe. I'm aware that the solution is to cut out the piece of pipe and replace using compression fittings. My question is this....

Will I have a problem getting the compression fittings into place with the new piece of pipe if it's cut to the exact length ?
or do I really need some sort of slip fitting....and if so is this readily available from B&Q or wickes ?

 

[45yearsagasman]

You may have enough sideways play in the pipes when you make the first cut and therefore installing the fittings would be simple. I would go to a plumbers merchant to get the correct advice and fittings, although the sheds may indeed stock slip fittings.

 

[Bosswhite]

I would cut out damaged section, if its only a small piece you may get away with just using a slip lock connection, The ends of the pipe go inside the fitting so the fitting is adjustable to the gap. (these do come in different lengths and "speedfit" which make a DIY repair easier.)

if its a large gap and difficult to get to, use a slip lock, piece of pipe and straight connection, in that way the slip lock gives you tolerance and can be adjusted to length of gap between both ends of the pipe..

 

[Bowness72]

I cut the piece of pipe out yesterday which is about 4 or 5 inches long because of working restrictions due to floor joist and bend in pipes etc. before I had thought about the tolerance issue. It looks like B&Q do a slip coupling but don't think they have differing lengths so might have to try find plumbers merchants depending on opening hours.

Cheers guys

 

[Charnwood]

Compression repair couplings are generally 100mm/4" long.
Speedfit do a telescopic one:

 

[FiremanT]

Have you got enough room above the comp. fitting to put the board back? Just a thought.

 

[Bowness72]

Job's a good un. Done and tested overnight. Just enough room to get board back I think.

Only problem now is that one radiator upstairs is cold. I've bled them all so I'm guessing it needs balancing. I've done that at a previous house and it didn't seem to work too well so just wondered if there's any sort of quick fix I could try first ?

 

[TonyW2]

Too late now, but for other DIYers---
If you can get the pipe dry (drained) by heating with a blow lamp, then cleaning, flux and a blob of solder will usually cure the damage.