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Air in hot water pipe for kitchen - bungalow property

Discussion in 'Plumbing and Central Heating' started by j77drs, 7 Apr 2020.

  1. j77drs

    j77drs

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    i have a gravity fed CH system in a bungalow.
    The hot water tank is behind the bathroom and cold water in the loft, ( above the bathroom )
    The hot water in the bathroom is fine, no air appears at all
    On the longer run to the front of the property where the kitchen is and cloak room after a few days air appears and taps start to trickle air,

    i was advised to put an auto air vent mid way in the pipe due to the length of the run but im just seeking advise from the pro`s on here as to whether that is right ?
     
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  3. CBW

    CBW

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    Do you mean gravity fed hot water - as in tank and cylinder? I had a similar problem once, and it was a combination tank and cylinder which had fallen to one side. I’d be checking the tank is filling correctly and checking the pipe itself to make sure it’s not falling back, trapping air.
     
  4. j77drs

    j77drs

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    Yes hot water cylinder, tank was new 18 months ago, bathroom is fine,
     
  5. CBW

    CBW

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    Again, look along the pipe length for any rise in the pipe, also there could be a restriction/blockage.
     
  6. j77drs

    j77drs

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    Already checked, the pipe hasn’t much fall to be honest but is almost as long as the property, when the air is there it’s easily resolved with putting a wet a cover the tap and drawing it out, it then appears a week or so later
     
  7. terryplumb

    terryplumb

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    Does the hot water pipe to kitchen run through the loft ?
     
  8. j77drs

    j77drs

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    yes through the loft
     
  9. terryplumb

    terryplumb

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    Is the branch pipe that heads to kitchen ,taken from the vent pipe ? Pics of your plumbing / pipework may be helpful relating to the kitchen pipe .
     
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  11. j77drs

    j77drs

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    ill check this but dont think so
    the run to the kitchen does t off towards the end to feed the cloakroom
     
  12. terryplumb

    terryplumb

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    It's the origin of the branch pipe that's in question. Where does the branch that heads toward the other end of the property actually connect to the cylinders distribution pipe ?
     
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  13. j77drs

    j77drs

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    So I went in the loft today to see how things are working, the bathroom hot water pulls from different pipes that look to be connected to the CH and off of a pipe that has a vent
    The kitchen pulls from what looks like the pipe from the top of the cylinder and there is no vent on any run of this pipe, it’s a 22mm pipe that reduces down
     
  14. Madrab

    Madrab

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    The pipe that runs from the top of the hot water cylinder should be feeding all your hot water outlets. That pipe should rise upwards to the cold water storage cistern (CWSC) in the loft, it then loops over the top and points into the CWSC (the open vent). The hot water distribution pipe should tee off of that vent pipe before that pipe gets to the CWSC and out to supply all the hot water outlets.

    If you kitchen is being supplied by a pipe from the top of the cylinder but that pipe does not rise up to the CWSC then that's your issue, air bubbles from the heated water is being caught in that pipe.

    I'm not exactly sure where your bathroom is being supplied from if it's not the same pipe that feeds the kitchen unless the HW cylinder has a separate tapping for a secondary supply from the side of the cylinder. If it is then it is being used as the expansion but not as the vent.

    As @terryplumb mentions , a few pics would say a thousand words and give us a better idea of what's going on.
     
  15. CBW

    CBW

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    You might need to check that you don’t have this situation as well
     

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  16. j77drs

    j77drs

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    No this is not the case
     
  17. CBW

    CBW

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    Photos will help better then.
     
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