Dishwasher waste

[rudeboy]

I am reinstalling a kitchen sink and dishwasher. The new sink is a double bowl with a combined waste kit, including a spigot for an appliance outlet.

I would prefer not to use this as it is close to the sink waste and others I've used like this make a row when the d/w drains.

The combined waste fits a trap, then runs about 300mm to the back wall and another 300mm down to meet a the existing horizontal run (800mm? and all 40mm) There it meets a 50mm tee and exits via another 50mm pipe to a ground level gully.

What I want to do is insert a swept tee on the horizontal run and connect a spigot there. Will this give me siphonage or backwash problems??

Also there will be no trap between the d/w waste and the outlet, but it doesn't connect to any soil pipe. Does this break any regs?

Thanks, Rudy

 

[Symptoms]

You shouldn't experience any siphonage or backwash problems on such large dia pipes with such short runs. You really should fit a trap in the d/w side (a running trap made of elbows would be OK) 'cos you will get foul air coming from the outside gulley.

 

[rudeboy]

Thanks, I'll give it a try. I can always revert to the spigot on the trap if it gets smelly.