Waste pipe query

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plumbingdazman

Hi everyone,

I need to run some waste pipes from a dishwasher trap and basin sink to a soil stack is it best doing it all in 40mm or is it best doing the basin waste to soil stack in 32mm and then use a tee with an adaptor to take the 40mm waste from the dishwasher trap its all first fix.

Ie if you can imagine a long wall of say 4meters, on the left is the soil stack and the far right is the dishwasher, and inbetween will be the basin. So the waste from the dishwasher i was gonna give its own trap then run a length of pipe about a meter to the tee in which the waste from the basin will enter after its come out of its trap.

Hope you are all with me sorry if it sounds confusing.

And also i'm gonna do it all in solvent weld but was just wondering do the compression ends of the traps allow the solvent pipe to form a water tight seal, i thought the o ring would compress onto it. Many thanks again

Darren

Also i've been asked to run some Hep2o to a coffee machine and to tee into the cold water where the mini glass dishwasher is. The dishwasher is using a dishwasher valve, what i was gonna do is unscrew this valve add a compression tee with short length of copper pipe and reattach the valve then can i use the free end of the tee to put the hep2o pipe into?

Cheers everyone
 
Hi. When forming a common waste as you suggest, you may well have problems with odours being emitted from appliances. As a result of self and induce syphonage. It is always a grey area. but you wont be the first to do it. Use 50 mm waste and anti syphon traps, along with cleaning eyes at changes of direction. Don't try and save 2 bob with 32 mm pipe as call back is almost definite. Good Luck
 
Is it a basin or a sink? (Basin waste is 32mm and sink is 40mm.) If sink, I'd do everything in 40mm. If basin, I'd fit 32mm trap then small piece of 32mm pipe from it, then convert it to 40mm. Or, instead of converting straight away, 32mm down to the tee and fit a 32mm-40mm reducer into the tee.

Re the coffee machine it's probably worth fitting a check valve on the supply just to be on the safe side.
 
i will use an anti syphon trap for the sink waste and can you get anti syphon
washing machine/dishwasher traps or not? if not what trap would you suggest using just lead? as the dishwasher waste is to far away from the sink waste to connect into the sink trap.

Cheers

And thankyou dontknowitall i will fit a check valve for sure
 
Personally i would do it in 50mm straight from dishwasher and then tee into that from basin. i think most manufacturers of dishwashers reccommend 50mm solvent aswell.😉
 
Hi. Air emittance valves 42 mm can be fitted to disallow syphonage of trap. Good luck
 
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