Joining 32mm waste to 25mm mode pipe

[Steve Barrett-Gladstone]

Hi Guys
I am building a summer house and fitting electrics and shower and sink. I can't run a full blown drain down 40m of garden as no easy connection. I am trenching in water pipe and armoured cable and because there is a good fall down the garden I was thinking of using 25mm (or 32mm) mdpe pipe as a waste pipe into an available gully which currently serves our house kitchen waste.
Maybe not ideal or reg compliant. The question is how do I join standard waste pipe to the mdpe?
All help gratefully received.

 

[Chalked]

Hi
If your digging a trench. Far better, for longevity to fit 4inch drain pipe.
Cheaper too.

 

[sammathias]

25mm pipe used as waste pipe over such a distance. 40m will block up almost certainly!

 

[SlimD]

25mm over 40m will block up in next to no time

 

[Steve Barrett-Gladstone]

Thanks guys...looks like I need to rethink.
I can't connect 4 inch to the house drains...any ideas about laying the 4 inch and reducing the final meter or so to flow into the gully.

 

[SlimD]

Have you considered a macerator like a saniflo to pump the waste away. I don't know if it'll work over a distance of 40m with a domestic one. Maybe a light commercial one would do it. With most domestic macerators they pump out through a 32mm pipe. Might be worth looking into.

 

[Chalked]

Bit of a bodge. But you could fit a small manhole at the end of the drain run for access. Then reduce it from there for a very short distance to whatever you are connecting into. As long as your not installing a toilet, this should be fine.
Ps this must go to foul drain.

 

[Steve Barrett-Gladstone]

It is only for the occasional shower and occasional sink use...no loo

 

[sammathias]

To be honest it isnt going to take the capacity of water the shower will dish out. And all the hair...