Minimum depth of solvent weld waste pipe fittings

[Chipstick]

I’m looking to run a sink and new waste pipe in to some existing solvent welded pipes but I’m restricted with what’s there due to the angles.




If I cut to the red line, that leaves just 18mm of 50mm pipe for me to put an elbow fitting pointing upwards. Is that likely to be enough penetration for the solvent joint? Appreciate it should go fully home but I don’t have the length (oo er)

The existing pipe goes through to the house but is all neatly boxed in, otherwise I would just cut, twist and reduce the initial elbow.

This is what I’m proposing to do - interested to hear if there are other ways to do it that I haven’t thought of.

[Unreal]

Insert one or more of these into the equation?

https://www.toolstation.com/solvent-weld-bend-925/...

[essayer]

Half the diameter of the pipe iirc

I think that’s about the same overlap I had to work with on a on a pool pump connector and that’s held fine with 1 bar+

[LooneyTunes]

Are you using the other larger vertical pipe?

If not, perhaps go round the corner and drop into that, trimmed/modified as appropriate? Either with a tee or adapter.

[hidetheelephants]

Hack the pipework off level with the face of the wall where it comes through the hole; use a dremel-u-like to trim the pipe back to a clean section inside the wall; glue on a straight coupling; glue a conversion bend to that facing upward and plumb the rest in to suit.