On 6/8/2016 11:17 PM, wrote:
On Wednesday, 8 June 2016 22:56:48 UTC+1, newshound wrote:
On 6/8/2016 9:44 PM, Phil L wrote:
wrote:
We want to move our washing machine to a location in the house where
drainage will be difficult. We *could* run 50mm pipe round about 8m
of walls with some AAVs, but it seems more sensible to use a pump,
most likely a Grundfos Sololift2 C-3 unless anyone has anything to
say about it.

You don't need AAv's for a washing machine, and the pipe doesn't need to be
50mm, also you can plumb the waste from the washing machine into a nearby
soilstack, it doesn't have to go into a gulley.


To get the right sizing of outlet pipe, we need to estimate the
inflow (too small, and the flow will be noisy, too large and the flow
will be too slow to self-clean).

Anyone have any idea even vaguely how fast a modern washing machine
pump chucks water out?


Overcomplicating a very simple job and wasting £250 IMO


I'm inclined to agree, I'd expect a washing machine pump to discharge
happily enough through 8 metres of 3/4 flexible hose (assuming it is a
more or less horizontal run, rather than vertically upwards). Especially
if you can manage a downwards slope on the final part.

OK, if we're saying it will work through 3/4 hose, that;s a totally different matter and will make SWMBO very happy. And yes, it's a horizontal run. I can manage a continuous downward slope.

I hope I am right now! Pipe friction will put some extra load on the
pump, but having a downward run should help. I think perhaps I would be
inclined to give it a try with just an 8 metre coil of hose on the
floor. I suppose I should try to do some pipe calcs for you, except that
I don't have pump head and nominal flow rate data to hand.