Drain Pipe for Washing Machine in Shed

kco3d

I plan to move our washing machine out to a shed in back garden and I'm currently looking at putting a drain pipe down. There is an AJ just outside back door used for grey water with what looks like 110mm size outlets which I could connect into. If I use 110mm pipe all the way to the shed, and include the required fall, the pipe will be higher than ground level at the shed end.

If I was able to use a smaller diameter pipe I think I could keep it all underground to the shed. Anyone know if I can use a smaller diameter pipe that would be suitable for burying under a patio which I could then connect to the AJ with an adaptor? 

Dr_Colossus

110mm pipe just for a washing machine outlet would be nuts. 1 1/4" or 32mm would be fine but if concerned 1 1/2" or 40mm is more than enough. What kind of length from shed to AJ are you talking about.

maestroamado

I would just measure the outside of the flex pipe which be around 25mm... go to hardware shop and pick up grey pipe this fits into... i would then gibe the machine a few fe runs before backfiling...

awec

110mm is a soil pipe, right?

Overkill.

maestroamado

https://www.boards.ie/discussion/comment/118991114#Comment_118991114

There are quite a few different types of soil pipes... they have color codes... grey for dirty water... black for pumping waste oil... the people in the epa don't really look inside... I think the OP referring to to 100mm in a couple of colors... usually for carrying sith...

PS i expect 110mm outer measure..

The Continental Op

OP just don't use the required fall. You can lay the pipe almost level as you aren't going to run any solids in it.

maestroamado

https://www.boards.ie/discussion/comment/118991241#Comment_118991241

Good point i did not think of this... once the origin of the waste pipe abit above the ground level all be ok...

kco3d

Thanks for all the replies folks. The reason I had the 110mm pipe in my head is I thought it was what had to be used for underground to withstand soil, hardcore, concrete, paving etc on top....

Will 40mm grey waste pipe be strong enough also? Its about a 10m run.

maestroamado

https://www.boards.ie/discussion/comment/118992102#Comment_118992102

I think if i was doing i would get 25mm black hydrodare water pipe... just measure the outside of the waste to make sure it fits inside... all you need do is run under and bend the pipe up 0.5 metre at machine... that pipe will withstand anything... no joints as one length and pretty flexible...

awec

https://www.boards.ie/discussion/comment/118992159#Comment_118992159

Basic question, would it not be more difficult to lay that sort of semi-flexible pipe? Could end up with unintentional rises in it?

maestroamado

https://www.boards.ie/discussion/comment/118992237#Comment_118992237

Its actually alot easier all you need do is ensure the clay under has no stones with the slope needed to carry water...

C. Eastwood

https://www.boards.ie/discussion/2058243655/drain-pipe-for-washing-machine-in-shed

You mentioned that the AJ that you intend to discharge the washing machine in to is grey water. Is this AJ discharging sewage.

chooseusername

If the upstand and trap is 11/2" use this size pipe to the AJ, then a 11/2" X 4" reducer for the inlet .

Regardless of whether the AJ has foul waste or not you will need a trap and make sure upstand is correct height.

C. Eastwood

https://www.boards.ie/discussion/2058243655/drain-pipe-for-washing-machine-in-shed

kco3d

as advise above, you must have a Gullytrap. This is to prevent sewer gas and foul odours from the existing AJ, escaping.

If the AJ is discharging in to a Soakpit - the power from the Washing Machine will block the Soakpit.

kco3d

https://www.boards.ie/discussion/comment/119002211#Comment_119002211

Thanks C.Eastwood. No sewage, just waste water from kitchen sink & dishwasher

https://www.boards.ie/discussion/comment/119004475#Comment_119004475

The only concern I have is whether 1 1/2 pipe can be buried under hardcore and patio pavers? Would it be strong enough? When I look up pipework for underground waste water, all I can see is the 110mm grey or orange pipe.

https://www.boards.ie/discussion/comment/119004904#Comment_119004904

Makes sense. thanks

The Continental Op

OP, whats the traffic going to be over the pipe?

If its just pedestrian then I don't think there is any pipe that would fail. If its vehicle traffic even proper sewer pipe will fail if its not deep enough and not fitted correctly.

I've recently removed a donkeys years old sewer pipe (probably put in in the 70's) that had one part of it over a very large rock. With just subsidence and compaction over the years the pipe bent around the rock pulling a poorly made joint apart. If the rock had been removed and a good layer of gravel put in the bottom of the trench and leveled before the pipe was installed it wouldn't have needed fixing.

My point is drains need good foundations just like buildings.

kco3d

https://www.boards.ie/discussion/comment/119005667#Comment_119005667

It's just light pedestrian traffic. Just concerned about pipe getting damaged during patio laying with compacting hard core. 40mm pipe would be lower in the ground than 110mm, but I expect the 110m could withstand more impact.

Any idea how deep pipe should be to be safe from compactor?

The Continental Op

You can lay it nearly on the surface and a compactor will have no effect on it. I can say that having done it. The compactor covers far to large an area to do any damage to a pipe. Now if it was a roller at just the wrong angle that might be a different story.