Discuss Waste pipes & water supply for dishwasher in pre existing kitchen in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Pickwickpick

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This one has been bugging me for days so thought would run it by you guys in case I'm missing something really obvious.

Had a call off someone who had bought a dishwasher as a surprise for their wife and wanted the waste and water pipes fitting, only issue is that the dishwasher had to be on the opposite side of the kitchen (see drawing below) and there was already a fitted kitchen in place. He also wanted all the work done in a 4-5 hour window as it was meant to be a surprise for his wife. He sent me some photos and I couldn't think of any way to plumb a solid waste pipe to the dishwasher in that time frame.

After calling him back to turn down the job, he told me he'd had someone off mybuilder who told him it would be doable and was prepared to do it for £120 + parts.

The only way I can think that the mybuilder plumber could have done it in that time frame is by using hose extensions on the waste. There's got to be at least 6m run from dishwasher to the sink, which would require connecting multiple flexis under the kitchen units, surely that's not a sound way to do this?

As I missing something here, is there a practical way to run a solid waste pipe around the U shaped kitchen with units already in place (and a gas oven in the middle)?

29fr74.jpg
 
Was going to say hose > 32mm push fit > to waste BUT only if the pipe had a fall all the way with no rise at the end.

Then saw the gas oven in the middle so that blows that out of the water.
 
A different route to an outside gully that wasn’t apparent in the photos you received?

I double checked with him and there definitely isn't, only viable route is around the kitchen units.

Was going to say hose > 32mm push fit > to waste BUT only if the pipe had a fall all the way with no rise at the end.

Then saw the gas oven in the middle so that blows that out of the water.

Yep the oven is bang in the middle of the U shape (should have marked that off on the drawing).
 
They’ll be extending the flexible waste all under the units and hoping the dishwasher pump is man enough I expect


At least I haven't missed anything glaringly obvious then, they are cutting corners. I'd have thought all that extra head on the dishwasher pump would wear it out considerably faster even if it does initially work?
 
There isn't a practical way of running the waste round. Over the distance you would struggle to maintain an adequate fall and with the bends it's just going to block up. You can't connect hose after hose either as I'm sure the dishwasher won't be able to pump over that distance. You could maybe do it with a macerator and run a 22mm pipe round the units. Was electrics even mentioned?
 
There isn't a practical way of running the waste round. Over the distance you would struggle to maintain an adequate fall and with the bends it's just going to block up. You can't connect hose after hose either as I'm sure the dishwasher won't be able to pump over that distance. You could maybe do it with a macerator and run a 22mm pipe round the units. Was electrics even mentioned?

Hadn't even thought of a macerator, something to bear in mind for the future, although I'm sure in this sort of context most would baulk at the idea of spending more on the plumbing than they did on the dishwasher in the first place.

There was a socket above the adjacent counter top.
 

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