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Waste Pipe Setup

Discussion in 'Plumbing and Central Heating' started by imroberts, 9 Sep 2021.

  1. imroberts

    imroberts

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    I have an existing waste pipe running from my garage into the drain outside which I'm planning to replace for a number of reasons.

    1) The run isn't particularly direct, running about 1.5m along the inside of the garage wall, through to the outside, and then runs back on itself outside. I don't know why it was fitted this way but if it was taken straight through the garage wall it would be more aesthetic from both sides as well as being around 3m shorter and with 4-5 less bends.

    2) I have a heat pump tumble which I'd like to drain externally to save emptying the bottle constantly.

    3) My boiler condensate pipe is leaking on an elbow underneath the boiler. This isn't a significant leak and I've ignored it for now as it's in the garage, but I'd like to replace this pipe while I'm doing the other work.

    My intention is to fit a running P trap for the two appliances, into this I will connect a tee followed by a bend, to give me two vertical standpipes. Does this sound sensible or is there a better way to achieve two standpipes without a multitude of fittings?

    I'm not sure how the boiler is currently plumbed in as it's currently behind the washing machine, but I'm assuming I can add another tee to the setup I've just described, followed by a 40-21.5mm reducer to take the overflow pipe from the boiler? Assuming that sounds right, should the boiler connection also go through the running P trap or should I connect it after the trap so the boiler goes straight to the drain?

    Any other considerations?
     
  2. imroberts

    imroberts

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    Does anyone have any comments?
     
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  4. Harry Bloomfield

    Harry Bloomfield

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    It sounds fine, but we don't have much idea about the physical layout of things, so difficult to comment more...
     
  5. Hugh Jaleak

    Hugh Jaleak

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    Boiler condensate can be classed as part of the flue, so may need to be done by a Gas Engineer.

    If you're connecting two appliances via hoses, then look at the McAlpine Twin Hose Connector 40mm | Traps | Screwfix.com this fits on top of a standpipe and allows 2 appliances to be connected, standpipe gives you the required trap, and makes the whole installation easier.
     
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