1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Pressure vessels and leaking overflow

Discussion in 'Plumbing and Central Heating' started by Packlam, 2 Feb 2018.

  1. Packlam

    Packlam

    Joined:
    2 Feb 2018
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom



    Hi all

    I have the above vessels connected to my CH/HW system. The overflows leak outside the house primarily when the HW is active and I’ve checked the pressure of each vessel with the system off. The red vessel (CH I think) shows 1 bar and the white shows nothing at all.....

    Hot water tank spec on the side suggests 3 bar for the connected pressure vessel so should I just pump the white one back up?

    Thanks in advance!

    Paul
     
  2. Sponsored Links
  3. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    8,554
    Thanks Received:
    2,479
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    Both need to pressure to be released for it's relative system before checking the EV's pre-charge. The white vessel will be for an un-vented hot water cylinder. You need a qualified engineer in to ensure it is suitably setup to safeguard your un-vented cylinder .... the pressure needs to be taken out the system before the vessel is pre-charged ...... aaaaaand it needs to be pre-charged to match the system design pressure as set at the inlet.
     
    Last edited: 2 Feb 2018
    • Thanks Thanks x 1
  4. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,406
    Thanks Received:
    887
    Country:
    United Kingdom
    "should I just pump the white one back up?
    "
    Not quite, you need to turn off the cold water supply to it first and turn on a hot tap and leave it open. Then when the pressure is relieved you can pump it up. Then finally close the tap and turn on the cold water again.
    Otherwise the pressure will go up quickly but you won't have actually put any air in.
     
  5. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,034
    Thanks Received:
    9,420
    Location:
    Hertfordshire & London
    Country:
    United Kingdom

    Not quite.

    Doing it that way you will be pumping for a long time;)
     
    • Thanks Thanks x 1
  6. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,406
    Thanks Received:
    887
    Country:
    United Kingdom
  7. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,034
    Thanks Received:
    9,420
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    170 lites more like :whistle:
     
  8. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,406
    Thanks Received:
    887
    Country:
    United Kingdom
    Even worse!
    How do you get that, I make it 18l, to add 3bar above ambient that would be 4bar absolute, will have 18l in already so add another 3x18l into it.
    Of course the work done will be exponential as you'd have to work against 3bar pressure for the last stroke.
    Glad I don't have that to charge by hand, lay off the gym for a day and do that instead
     
  9. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,034
    Thanks Received:
    9,420
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Not sure where you got 4 bar from.

    But...op, using your method, he'd be pushing through the cylinder volume.
     
  10. Sponsored Links
  11. Wildcat1961

    Wildcat1961

    Joined:
    19 May 2010
    Messages:
    345
    Thanks Received:
    71
    Location:
    Essex
    Country:
    United Kingdom
    :).
    Don’t feel it necessary replying to threads especially when not qualified to do so.
    I wrote it in the nicest possible way so as not to offend you.;)
     
    • Like Like x 1
  12. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,406
    Thanks Received:
    887
    Country:
    United Kingdom
    Says on the side 3 bar which would be relative to atmospheric at 1 bar. Th
     
  13. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,034
    Thanks Received:
    9,420
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Nope.
     
  14. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,406
    Thanks Received:
    887
    Country:
    United Kingdom
    best way to learn by people pointing your errors out! Look up growth mindset on line
     
  15. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,034
    Thanks Received:
    9,420
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Thing is, you are giving advise. Not learning. If we weren't here to correct you, where would the op be?
     
  16. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,406
    Thanks Received:
    887
    Country:
    United Kingdom
    Exactly, that's why you're so valuable to the forum Dan!
    To be fair I could make it clearer I'm not a pro, but wiring it on every post looks stupid.
    So far you've taught me a lot, I certainly owe you a pint:love:
    Maybe you can enlighten me on the whole 3 bar charge pressure?
     
  17. Wildcat1961

    Wildcat1961

    Joined:
    19 May 2010
    Messages:
    345
    Thanks Received:
    71
    Location:
    Essex
    Country:
    United Kingdom
    Not at the expense of others, as in the DIYers seeking correct advice.
     
Loading...

Share This Page