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kitchen waste advice

Discussion in 'Plumbing and Central Heating' started by rob7475, 7 Feb 2014.

  1. rob7475

    rob7475

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    Hi,

    I am planning a new kitchen and things are going to be moving from their old positions.

    The 1.5 bowl sink and dishwasher are going to be on a peninsular so I'm planning on running the waste down to the cellar below which will then run to the washing machine which is in the cellar before leaving the sice of the building into a gully type drain.

    The total run from the sink to leaving the house will be about 4 metre. Do I need to fit air admittance valves or anti syphon traps on the sink/dishwasher?

    I've had a look for a sink waste kit that has an anti syphon trap but mcalpine don't seem to do one.

    Cheers

    Rob
     
  2. treerat

    treerat

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    Anti syphon traps work in the same way as air admitance valves and 4m is a long run for 40mm wast plpe.
    You could increase the sise of pipe in the seller to 50mm or put an anti syphon trap under the sink if you can get one.
    The other option is to fit a 40mm air admitance valv in the seller between the sink and washing machene and as close to the sink end of the run as posible to prevent any back flow from giong up the air admitance valve
    There is a chance that both fixtues will discharge water at the same time and the problem will be at the washing machene end as this is were water from both meet. Useing swept bends rather than tite bends will also reduce the risk of syphonage
     
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  4. rob7475

    rob7475

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  5. Hugh Jaleak

    Hugh Jaleak

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    I would run a max of 3m in 40mm, use anti vac traps on the sink(s), after the first 3m upsize to 50mm. I would be wary on joining the washing machine into this run at a lower level, it really needs a dedicated waste to outside. Should the waste block past the washing machine connection, and then the sink or dishwasher discharge upstairs you are either going to get a flood, backflow into the washing machine or if unnoticed, possibly both.....
     
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  7. GavThePlumber

    GavThePlumber

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