Soil pipe gas leak

[onjayuk]

Hi, Please could someone advise me!

Problem
- Ground floor bathroom intermittent sewage smell when soil pipe is in heavy use and in winter only

What i've tried
- Had smoke bomb test and drains checked no problems
- Changed air admittance valves

Then took out boxing and waited for the smell



Then finally smell started coming out of this joint which is the toilet waste going into the soil boss pipe.

Can anyone tell me by looking at this how I can test for gas leak? and to repair this or will I have to replace the whole lot? If it's welded will I need to changed the whole boss section?

2 years of search and I think I have it!

Cheers

 

[onjayuk]

Sorry image should be horizontal

 

[tom609]

if you can get to the horizontal section you could take the pipe out and get a new seal that fits inside the branch otherwise cut the horizontal and fit a slip socket if you cant get another o ring a new junction is req make sure you chamfer the pipes and plenty of grease

 

[onjayuk]

Thanks for the reply, if the pipe is welded though will that mean I would have to cut at the branch? There is no water leak visible, Is gap cement filler an option?

 

[tom609]

looks pushfit to me for sure might have solvent waste fittings connected to it but that joint looks push fit

 

[onjayuk]

looks pushfit to me for sure might have solvent waste fittings connected to it but that joint looks push fit

makes sense now, when the soil pipe is under heavy load it pulls air from the poorly sealed rubber at the joint and then within a few mins the rubber falls back into place. I'll blast some gas leak detector on it to see if anything happens.

Cheers

 

[tom609]

doubt very much it will show with leak detector you will get the smells coming in due to pressure differences within the drains and house are you sure its from that joint sometimes its from the drain connector at the bottom of the stack and filtering up the pipebox

 

[tamz]

Leak spray will only work if you pressurise the drain (test it)

Take the toilet out, pull the pipe out of its fitting, replace the rubber seal and clip with the same make (make will be on the fitting) put it back together again (lube the joint) job done in under an hour.

 

[Howsie]

And make sure the pipe is chamfered before you push it back in. It may not have been in the first place and could be what caused this.

 

[AWheating]

do as tamz has suggested. use a good thick amount of grease to lube the joint and it will be good.