Unvented pressure release into sink waste pipe - smelly

Discussion in 'Plumbing and Central Heating' started by wwwebber, 8 May 2019.

  1. wwwebber

    wwwebber

    Joined:
    5 May 2004
    Messages:
    435
    Thanks Received:
    24
    Country:
    United Kingdom
    Ok, we had an unvented cylinder fitted last year and every now and then our en suite would fill up with bad smells. We located this to the pipe that comes out of the unvented cylinder which has a tundish on it. The problem here is that this pipe drains into the sink waste. As a result sewer smells are penetrating the room. The smells go away if cap this pipe off but this is not safe of course, however neither is sewer stink !!

    Has the plumber cocked up here ? does this pipe need some kind of valve on it ? or does it need to be disconnected from the sink waste and fed directly outside ?

    Cheers.
     
  2. Sponsored Links
  3. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,435
    Thanks Received:
    3,105
    Location:
    Daventry
    Country:
    United Kingdom
    You were given the answer to this when you posted about it 2 months ago...
     
  4. wwwebber

    wwwebber

    Joined:
    5 May 2004
    Messages:
    435
    Thanks Received:
    24
    Country:
    United Kingdom
    Incorrect. That thread was about identifying where the smell was coming from. My last post on that thread was "how do I get this fixed" and the thread died right there. So I have created another without all of the guff, focusing on how to resolve it. Care to contribute positively ?
     
  5. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,435
    Thanks Received:
    3,105
    Location:
    Daventry
    Country:
    United Kingdom
    The discharge needs to be a dedicated pipe with no other appliances connected into it before it reaches the stack. It must be run in high temperature resistant pipe, via a dry trap such as a HepVo with a tundish adapter on it
     
    • Thanks Thanks x 1
  6. bernardgreen

    bernardgreen

    Joined:
    3 Nov 2006
    Messages:
    26,053
    Thanks Received:
    2,598
    Location:
    Bedfordshire
    Country:
    United Kingdom
    Item 2 the visible air break is your tundish
    Item 3 the 75 mm trap is what would have prevented sewer gas coming out of the tundish had the installer fitted it.
     

    Attached Files:

    Last edited by a moderator: 8 May 2019
  7. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,435
    Thanks Received:
    3,105
    Location:
    Daventry
    Country:
    United Kingdom
    Wrong again Bernie - this is the discharge arrangement for a boiler condensate pipe. The OP is asking about the arrangement for an unvented cylinder discharge, which is very definitely not to be installed in the manner described in your post
     
  8. wwwebber

    wwwebber

    Joined:
    5 May 2004
    Messages:
    435
    Thanks Received:
    24
    Country:
    United Kingdom
    @muggles thank you. I will look into having a go myself as this seems relatively simple. If not I will get the plumber back.

    Cheers.
     
  9. bernardgreen

    bernardgreen

    Joined:
    3 Nov 2006
    Messages:
    26,053
    Thanks Received:
    2,598
    Location:
    Bedfordshire
    Country:
    United Kingdom
    Yes I did get it wrong.

    But then so did the ( I assume ) G3 qualified installer
     
  10. Sponsored Links
  11. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    8,196
    Thanks Received:
    1,375
    Location:
    Potters Bar
    Country:
    United Kingdom
    Two wrongs don't make a right!
    Yet, to assume makes an ass (out of) u (says) me :LOL:
     
    • Thanks Thanks x 1
  12. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    8,196
    Thanks Received:
    1,375
    Location:
    Potters Bar
    Country:
    United Kingdom
    Need to be g3 qualified and this all goes in the benchmark.
     
  13. wwwebber

    wwwebber

    Joined:
    5 May 2004
    Messages:
    435
    Thanks Received:
    24
    Country:
    United Kingdom
    Fair point. I will get him back.
     
  14. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    8,196
    Thanks Received:
    1,375
    Location:
    Potters Bar
    Country:
    United Kingdom
    Is he g3? I'd be surprised if he is, as doing something wrong when you should know better is often worse than doing something you don't know!

    Wrong pipe for discharge can cause a lot of problems...
    IMG_20190128_153204.jpg

    IMG_20190128_152212.jpg
     
    Last edited: 8 May 2019
  15. wwwebber

    wwwebber

    Joined:
    5 May 2004
    Messages:
    435
    Thanks Received:
    24
    Country:
    United Kingdom
    It said G3 on his card and it was in date. Not good either way.
     
  16. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    8,196
    Thanks Received:
    1,375
    Location:
    Potters Bar
    Country:
    United Kingdom
    Before Bernard pipes in (scuze the pun)... No! That is not good either way and I'd ask your fitter why he thought it would be OK to do that!
     
  17. oilboffin

    oilboffin

    Joined:
    26 Apr 2011
    Messages:
    1,665
    Thanks Received:
    247
    Location:
    isle of Lewis
    Country:
    United Kingdom
    Vgood point looks snood to me.Bob
     
Loading...

Share This Page