washing machine own waste into soil trap

[jakbop]

What do you think, Regarding the preferred location of the washing machine, 3m away from outside all and the waste pipe:

The scheme is to clip machine hose to 22mm rigid overflow pipe for upstand, which passes down and along with its gentle slope to, and through the outside wall and discharges into kitchen soil waste trap. That means it misses the sink U-bend and it's waste pipe.

Reason for this scheme are:
- to get a neat, slim projection of pipes behind kitchen base units, including cooker etc
- there's a a waiting 22mm hole through the wall already,
- it'll save the mess of joints on sink traps on an undermount sink....
- which is, fairly close to the outside wall anyway.

The kitchen re-fit is about to be finished with all new plumbing, before bases units go in.

I have tried the machine directly onto a lengths of 22mm copper, roughly in place and the pump doesn't seem to mind the distance and bore, and chucks out the waste, lovely.

Problems may be:
- freezing ,due to the size... perhaps.
- 3m at this 22mm bore may strain the pump, though note availability of waste hose 22mm bore extensions
- long pipe may furr up easily, and it would be plumbed in behind cabinets.

Is there a significant advantage in a larger bore pipe?

Cheers, for your succinct comment.
.

 

[TicklyT]

You will need to fit a trap somewhere along the waste run, unless you want a washing machine that smells of .... er.... 'sewer gases'.

The normal alternative to running the washing machine waste into the sink trap is to run a seperate 40mm waste behind / below the kitchen base units with an appliance trap and standpipe on the end to take the machine hose.

There's usually plenty of room in the services void behind the units.

The pipe can be teed into the sink waste (or the sink waste teed into the appliance waste, depending on your point of view), or it can exit seperately to drop into an external gulley.

It sounds like your scheme could also make moving the washing machine out for servicing or repair very awkward.

 

[jakbop]

Thanks for your reply TickyT.

run a seperate 40mm waste behind / below the kitchen base units with an appliance trap and standpipe on the end to take the machine hose.

That's the alternative I shall do, and T in the sink trap OR; if not, a 2.8 meter length to extend the 22mm pump outlet, going into the sink waste above it's trap.



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