Washing machine waste - 32mm

[dormermike]

Hello

I had the plumbing done in the summer for a washing machine and I want to add a tumble dryer outlet to it, and i've noticed that they've actually done the waste in 32mm and not 40mm to the outside gully. Total run is approx 4.5m from top of upstand. The upstand itself is 40mm, as is the U bend, but then it goes into a 40-32mm reducer and 32mm for the rest of the run, which has 2x 90 degree bends.

I'm considering changing this for a 40mm for as much of the run either side of the wall as possible, i.e. replace 2m of the 32mm with 40mm, and, replace the outside run of approx 1.8-2m with 40mm from the existing 32. So the only 32mm run would be through the wall, as I don't have an SDS and its going to be a pain to change that anyway as the boiler is discharging into it.

Is this worthwhile, or a waste of time? I really can't change the 32mm through the wall. PS the washing machine has been running fine on 32mm so far...

Thanks

 

[Burnerman]

32mm waste will be fine for both appliances.
John

 

[Madrab]

then it goes into a 40-32mm reducer and 32mm for the rest of the run, which has 2x 90 degree bends.

Naughty naughty, not exactly proper but probably won't be an issue if it's into a gully as it's basically an open ended pipe so little in the way of restrictions.

Wouldn't be an use in changing any of it to 40mm as the bottleneck would always be the 32mm section.

 

[dormermike]

Thank you all. I've bought a mcalpine wm3 for plumbing two appliances, so i'll attach that. Good thing is, whilst it has a breather, the hole is tiny, so hopefully less chance of it all backing up and leaking, the washing machine would hopefully throw an error before popping the top off.