teeing into a sewer line

[Jupiter01]

My sewer line goes along the garden and is using one of those brown 110mm pipes. It's buried under the garden. I want to tee into this to include a new waste line. This is all before the shared sewer line by the way. I can see how I can expose where this is in the garden but I don't see how I get one of these on there as there will be no flexibility once I have cut it.

Can you please advise. Thanks in advance.

 

[denso13]

You can cut a bit more out and use the appropriate Flexseal/Fernco couplings to piece a bit back in. But you really should have building regs approval for that.

 

[Hugh Jaleak]

Slip Coupling. Expose the existing pipe, mark position of where you want the Junction to go, cut existing pipe to suit. Chamfer ends, mark Position Slip Coupler needs to be at to sit half way on each end of the pipework, then slide it fully over downstream pipe. Slot Junction into the run and pull Slip Coupler back to marked position to make downstream joint.

How do you propose to access the new drain run for rodding in the future should it block?

 

[Jupiter01]

Should I use two slip couplings in conjunction with a tee or are the fernco fittings preferable in this situation?

Good point on rodding. I will put an access point in the section of pipe that comes down the house.

 

[denso13]

Anything that works really. But it is only right to point out that you should have approval for that.

 

[Jupiter01]

With this type of fitting, could I cut a section out of the sewer pipe, which is as long as the straight bit of this, then push one end on and use a slip coupling on the other end. If you follow my explanations, there will be a gap on this other end and I was wondering if the slip coupling can cope with that?

Thanks for your help.

 

[denso13]

Yes.

 

[Jupiter01]

If I’m understanding it correctly, there will be this much (white arrow) on the other side that will need to be handled by the slip coupling.

 

[Hugh Jaleak]

If need be, get a Triple socket Junction, and then put a short stub of Pipe in one end, then use your Slip Coupling. It'll give you some wriggle room to get the Junction into the existing line.

Junction https://www.bes.co.uk/triple-socket-equal-junction-110mm-x-45-13400/

Coupler https://www.bes.co.uk/110-mm-double-socket-coupler-pvc-with-removable-centre-stop-polypipe-13384/

Although if this proposed Line is taking a WC, then you really need to be looking at fitting a Chamber at the point of connection, not a Junction.

 

[Jupiter01]

Was doing some more reading on this and saw a suggestion that you use a triple socket junction and enter a small bit of pipe on both sides. You then cut the sewer pipe at this exact length, slip on couplings on both cut ends of the sewer pipe and this new junction (with the small lengths of pipe) can slot straight in. You then slide on the slip couplings.

Thoughts?

 

[pcaouolte]

Why do you need 3 slip couplings? Cut a section out of the existing pipe, shove the tee onto the existing upstream pipe. Shove your new pipe into the new tee. The slip coupling is only needed between your tee and the downstream pipe.

 

[Jupiter01]

Why do you need 3 slip couplings? Cut a section out of the existing pipe, shove the tee onto the existing upstream pipe. Shove your new pipe into the new tee. The slip coupling is only needed between your tee and the downstream pipe.

You don’t need 3 slip couplings. 2 for my method.
With your approach, there will be a gap between the downstream sewer pipe and the small pipe length you have put into the downstream part of the tee, because the upstream has been pushed on to the sewer pipe?

 

[dilalio]

You don’t need 3 slip couplings. 2 for my method.
With your approach, there will be a gap between the downstream sewer pipe and the small pipe length you have put into the downstream part of the tee, because the upstream has been pushed on to the sewer pipe?

No... You give yourself enough room to rotate the socket with a stub of pipe in one end, onto the existing cut pipe, when it's fully on you should have a tiny gap which the slip coupling then slides over and bridges.
If you wish to use 2 slips then that's up to you but unnecessary if you know what you're doing.

 

[Jupiter01]

you should have a tiny gap

The same size as the bit I have marked in white?

 

[dilalio]

The same size as the bit I have marked in white?

No... You can usually wiggle it in but if 2 slips are easier, do that.