Blank Pipe next to Pipe? Air chambers.

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by MAD King, Aug 11, 2013.

  1. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    Hello,

    I am wondering why there are a separate pipes beside the pipes which go to the valves.
    I got that on every valve pipe in my whole house.
    What is the sense behind and do I need it?

    Thank you
     

    Attached Files:

  2. asktom

    asktom Member

    Joined:
    Nov 9, 2009
    Location:
    Victor, MT
    Those are air chambers meant to reduce watter hammer, but they are ineffective. In no time at all they are filled with water were and undersized to begin with, sort of an oldtime plumbing superstition. They don't do any good but they don't do any harm. I don't know what project is that caused you to open the wall, but it makes things easier to leave them in, leave them in. If it easier if you cut them out, cut them out.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. Jerome2877

    Jerome2877 In the Trades

    Joined:
    Aug 25, 2009
    Location:
    BC
    They are air chambers to reduce the effects of water hammer. They are probably full of water now and doing nothing. They make proper water hammer arrestors now that have seperate air chambers that cannot fill with water. If you completly drain your system down they will work again but will eventually fill with water again.
     
  5. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    That is my shower. I will leave that in. But under my bathroom sinks are the same. So it is save to leave it off when I replace the pipes.

    Thank you
     
  6. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    Your question was already answered twice, but perhaps a third time will help. They do no good, but they don't hurt anything. If it was mine, I'd cut them off at the tees and sweat a cap on the stub, but you can leave them if you want to.
     
  7. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    Can you recommend water hammer arrestors which are not too expensive?
     
  8. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Information Technology
    Location:
    NW Ontario, Canada
    The way they were put in, Tee'd off the side like that, they will waterlog and stay that way. If they were Tee'd at the top so as to collect air they may have stood a chance of working.
     
  9. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    No, they don't work at the way there are now in
     
  10. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Information Technology
    Location:
    NW Ontario, Canada
  11. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    Thank you.
     
  12. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Information Technology
    Location:
    NW Ontario, Canada
    Really, the only place you need them are where you have fast closing solenoid valves, such as washing machine, dish washer, ice maker, etc..
     
  13. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    Oh, ok, so after replacing the old pipes I can leave that off and just put something like this for the washing machine and dish washer?

    [​IMG]

    The one on the left
     
    Last edited by a moderator: Jun 9, 2014
  14. asktom

    asktom Member

    Joined:
    Nov 9, 2009
    Location:
    Victor, MT
    If you put in arrestors, install them outside the wall, not inside. When they fail you want them to be easy to change. If you haven't had a problem with water hammer and they aren't required by local code, forget them. You can always add them later if you need to. Why try to solve a problem you don't have?
     
  15. MAD King

    MAD King New Member

    Joined:
    Mar 24, 2013
    Location:
    Nashville, TN
    Like LLigetfa mentioned. I have only hammering with the washing machine and dish washer. Would the arrestor I linked in my previous posting work?
     
Similar Threads: Blank Pipe
Forum Title Date
Plumbing Forum, Professional & DIY Advice Thermal Blanket on Gas heater Oct 27, 2005
Plumbing Forum, Professional & DIY Advice Cast Iron Pipes with Gooey Stalactites Jul 27, 2015
Plumbing Forum, Professional & DIY Advice PEX supported clamps & pipe Jul 27, 2015
Plumbing Forum, Professional & DIY Advice "The mystery of the old house pipes and the Golden Plumber" Jul 14, 2015
Plumbing Forum, Professional & DIY Advice cleanout pipe threads destroyed Jul 10, 2015

Share This Page