standpipe

radiat

Hi,
The waste water from our dishwasher goes into a standpipe which is about 300mm high. I believe it should be about double that. Why so? and will the shorter stand pipe cause problems?

Thanks for your help

Joey the lips

The trick with the waste pipe from a diswasher is to have it going up before down. This is because the last rinse injects clean water into the pipe creating a vapour dam.

Now unless this has changed this is the only reason for a high pipe. personally i would try get an applience trap and run them into the sink. That way the vapour trap in the sink does this for you.

radiat

Thanks Joey.
How does the waste water get up to the top of the standpipe. Is there a pump in the dishwasher that does this?

So if clean water is being pumped out the waste pipe at the end of the cycle (i presume this amount of water is always the same) why does the height of the standpipe matter? And should i increase the height of the standpipe?

Joey the lips

You can actually buy a washing machine upstand kit. It comes with 3 ft of pipe. The height of the standpipe only matters it makes it full proof so in later years when someone changes there machine they dont make a booby.,

I dont understand why you are asking why does it matter. You either want it present or not. If its not present then you have to use an applience trap. If it is present the machine travels up to it as described

radiat

But the standpipe only goes up about 300mm, as opposed to about 600 which i believe it should be.

So my question is, is it okay to have a short standpipe or do i need to extend it?

heinbloed

.....I believe it should be about double that. Why so?......

This is a technical forum, radiat. Theological issues can't be answered here.

Read the manual of your apliance, follow what is recommended there.

And yes, dishwashers have a pump build-in.

DoneDL

Ideally it shoulld be 600mm but I have seen them shorter. Either add another 300mm with a coupling of fit one of these

WASHING MACHINE TRAPS

White traps to BS 3943. Polypropylene. With or without anti-syphon
Trap (with 0.6m upstand pipe & 2 clips)

Joey the lips

heinbloed wrote: »

This is a technical forum, radiat. Theological issues can't be answered here.

Read the manual of your apliance, follow what is recommended there.

And yes, dishwashers have a pump build-in.

You might not realise it but you will get a lot more thanks and support if you address people better. It might be a techanical forum but if it was only techanical it would bore the hell out of many including me.