External waste water pipe leaking

[bobski1]

The external waste pipe which runs from the kitchen sink to a drain has begun to leak. Nothing significant but I notice a damp patch from time to time. I've never really had to deal with plastic pipes but am I right to assume it should just twist off or do I need to cut and dismantle?

I'm thinking I just need to buy a new joining piece or do I need to replace more of it?

[smokey mow]

The cap which is a rodding point would just twist off but the connection between the waste and tee will be solvent welded.

[bobski1]

smokey mow said:

The cap which is a rodding point would just twist off but the connection between the waste and tee will be solvent welded.

Okay will give the cap a twist and see if there is anything obviously wrong.

Is there a way to remove the tee without having to cut it off? The waste coming out the house doesn't seem to have much length to it.
Could I just silicone around the leak point to bodge for now?

Pipe runs under the deck, never lifted it to see where it runs so now might be the time

[GliderRider]

If there is an O ring in the twist off cap, replacing it may cure the leak.

[bobski1]

GliderRider said:

If there is an O ring in the twist off cap, replacing it may cure the leak.

The leak is coming from where the t-piece joins the length that runs below deck

[GasEngineer]

once solvent weld fittings are glued they can't be removed.

If you can't access and remove /replace the pipe, best bet is to repair it with something like CT1.

https://shop.ct1.com/gb/ct1-clear

[bobski1]

GasEngineer said:

once solvent weld fittings are glued they can't be removed.

If you can't access and remove /replace the pipe, best bet is to repair it with something like CT1.

https://shop.ct1.com/gb/ct1-clear

Sounds like the easiest option for the moment no idea what I will discover if I take up the decking and don't need another thing added to the list!

[bobski1]

So upon further investigation it seems that the T-piece is actually splitting where it flares out, will try to seal it for the time being but I think it will need to be a proper repair.



Are the sizes and parts fairly standard to get?

[megaphone]

Yes they are standard. You may need to replace the pipe that goes through the wall.

[bobski1]

megaphone said:

Yes they are standard. You may need to replace the pipe that goes through the wall.

Yep going to need to change the pipe from the inside all the way down the deck. For now will try to bodge it to give me a couple of weeks to get other stuff sorted and then get to fixing it. With 2 minions running around getting work like that done is a pain.

Am I right to assume it is 40mm diameter is the standard?

https://www.screwfix.com/p/floplast-equal-tees-whi...
https://www.screwfix.com/p/floplast-abs-access-plu...

Given it is outdoors is it better to solvent weld or do push fit pieces work?

Edited by bobski1 on Monday 7th October 15:23

[Peanut Gallery]

I have had luck in the past of getting a new T piece, and removing the old one not by cutting the pipe off, but by splitting the old T piece and peeling it off the original pipe. The pipe is then the correct length, and can be sanded down to a nice smooth finish, and then the new T piece just glued up and slid over the original pipework.

Yes, risky, as the pipe can split, have too many scratches, crack, bend - etc. But it might make life easier than replacing pipework through walls etc.