Washing machine plumbing

Discussion in 'Plumbers' Talk' started by furious_customer, Aug 10, 2018.

  1. furious_customer

    furious_customer Active Member

    I had some new plumbing added to a cloakroom/utility room for the washing machine.

    I have about 18 inches of waste pipe coming out of the floor (connected straight onto a boss in the soil-pipe under the floor).

    What type of trap do I need before adding the washing machine spigot?
     
  2. rogerk101

    rogerk101 Well-Known Member

  3. furious_customer

    furious_customer Active Member

    So I have a vertical pipe coming out of the floor - how would I connect it to this?
     
  4. rogerk101

    rogerk101 Well-Known Member

  5. just pumps

    just pumps Active Member

  6. furious_customer

    furious_customer Active Member

    I was wondering if an S-trap would be best?
     
    Last edited: Aug 10, 2018
  7. RolandK

    RolandK Active Member

    Cut the pipe a bit closer to the floor and fit S Trap with an upstand pipe for the machine drain hose.
     
  8. The Teach

    The Teach Well-Known Member

    Just source a S-trap with 40mm compression fittings on both connections but why make more work when purpose made wm/dw stand pipe kits are available and are known to work ;)

    using the correct fittings has advantages :)
     
  9. furious_customer

    furious_customer Active Member

    I'm all for using the correct fitting, but I just don't know what that is!

    The stand-pipe kit has a horizontal connecition and I have a vertical pipe.
    Do I just add a 90 degree elbow to the pipe and then connect it to the stand-pipe?

    This will effectively form an s-trap anyway.

    Are s-traps bad? I keep seeing info on US websites suggesting that are the wrong thing to use.
     
  10. The Teach

    The Teach Well-Known Member

    ;) Yes, it has been mentioned by others.
    are you in America ?
     
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  11. furious_customer

    furious_customer Active Member

    Nope, but the laws of fluid-dyamics are the same in both countries. :)
    (Even after brexit I believe!)
     
  12. The Teach

    The Teach Well-Known Member

    Ok, i consider i have been Trumped :p
     
    just pumps and furious_customer like this.
  13. furious_customer

    furious_customer Active Member

    Seriosuly though, the suggestion seems to be that they can allow the trap to be siphoned empty?
    Not sure why.

    if I fit the standpipe, can I attach a washing machine spigot at the top (like the one under my sink)?
    Or would this cause a venting problem?
     
    Last edited: Aug 10, 2018
  14. just pumps

    just pumps Active Member

    Leave the pipe open.
     
  15. RolandK

    RolandK Active Member

    Illegal in parts of the US for some reason.
     
  16. furious_customer

    furious_customer Active Member

    Does the machine not pump out water faster than the drain can remove it?
     
  17. just pumps

    just pumps Active Member

    Only if the vertical is too low, the pipe to the drain hasn`t the correct "Fall" on it or has a restriction in it.
     
  18. Alwaysworking

    Alwaysworking Member

    F,F,S
     
  19. HarDeBloodyHarHar

    HarDeBloodyHarHar Active Member

    And the washing machine drain hose should enter the stand-pipe at the height of the washing machine.
     
  20. Heat

    Heat Well-Known Member

    It also should only go into the standpipe a short distance of I would say approx 6” (150mm)
    To push it in too far can cause a syphon effect on machine.
    Best way to achieve keeping the hose correct distance is to use the U shaped plastic former that the waste hose snaps into
     

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