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  1. #1


    First, Thanks for taking time to look at my question.

    Alright, heres the situation. I have a 16 two bedroom apartment building using a central boiler to heat the apartments. The tubing ran through out is the old gray Polybuetelene (PB) connecting to baseboard radiators (alum. finned copper pipes). On the top floor of an end apartment I am hearing a pipe or something "vibrating" "rattling" inside the wall. The best way that ive found to describe it is like a cabinet door closing and boucing against the frame of the cabinet. I only hear it about every 5 or so min. Its very random on loudness and when it happens. I tried bleeding air out of the line from a small bleader port but just got water. Im stumpped and so is my parts house. Any suggestions. Thanks again for your help.

    P>S> If anymore info is needed please let me know.


  2. #2
    Air in there, call someone.
    Hey cockroach, don't bug me!


    Bring Em Home....

  3. #3
    Join Date
    Mar 2001


    zone valve cycling?

  4. #4
    Senior Tech Guest
    Air...polybutylene pipe was also the subject of a class action lawsuit due to random leaks for no reason among other things, google it and you should find the info.

  5. #5
    Join Date
    Aug 2002
    manitowoc wisconsin
    That old grey pipe has no oxygen barrier.Go check out rehau's site or wirsbro's.Pex intended for domestic water use will give you air problems until it is replaced with pex rated for heating use.
    Take your time & do it right!

  6. #6
    Join Date
    Oct 2005

    Is there

    A control valve at that location or any isolation valves. Oxygen in this system as they mentioned may have rusted or broken something that moved in the pipe line. Do you treat the system with chemicals?

  7. #7
    The only control valve on the system is a hand operated valve that moves an insert in and out to control the flow.

    There currently isnt any chemicals in the water and havent been in years from what I know of. Im Working on changing that when the weather warms up enough to flush the system.

  8. #8
    Join Date
    Feb 2006
    You know, complain as we might about plumbing codes, NY never allowed polybutylene piping and I'm glad they didn't.

  9. #9
    Would not having air in the expainsion tank cause this problem also?

  10. #10
    Senior Tech Guest
    Originally posted by toledo-nate
    Would not having air in the expainsion tank cause this problem also?
    Ummmmmmmmm...I hope there's air in there...

  11. #11
    Well I found out that the expansion tanks didnt have any air in them (40 gal steel tank with an airtrol valve). Also replaced the air bleeders on the boilers. Hopefully this takes care of it.

  12. #12
    Join Date
    Jan 2006
    check pressure regulator, pressure gauge (I.e. give it a tap with the Maglite!) ensure there is air in the expansion tank. Can you connect hose from city water supply to boiler drain and flush system through to remove airlocks? Hammering is always a problem with air and/or flow. What is aquastat set at?

  13. #13
    Join Date
    Oct 2001
    Air traveling through pipes and baseboard heaters usually creates swooshing or gurgling sound.
    Your description suggests a water hummer. Since there are no fast closing zone valves in this system I believe that you are looking for the problem in a wrong place.
    You say that noise is in the wall. Maybe there are domestic water pipes in this wall that are loose. Now all you need is a toilet with Fluid Master fill valve and leaking flush valve. This would explain 5 minutes intervals.

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