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“Tinkling” sound in system

northernsoulnorthernsoul Member Posts: 112
Hi there

Gas boiler system with original 1930s rads and metal expansion tank.

This last day or so it sounds like a tinkling sound coming from pipes/expansion tank in the boiler room. It happened around this time last year as well and lasted for a few weeks. Hasn’t happened until now this heating season

Not sure if a pipe is loose or there is something in the tank- it’s like the sound of a small piece of metal moving or the sound when a pot lid rattles when boiling .

Expansion tank was emptied and recharged weeks ago.

Any ideas ?

Comments

  • northernsoulnorthernsoul Member Posts: 112
    I should add that it seems to mainly happened when system starts and then for about 30 min after it shuts off.
  • JUGHNEJUGHNE Member Posts: 6,783
    How about a rattling flow check valve; would only chatter when the pump is running.
  • northernsoulnorthernsoul Member Posts: 112
    Is that the pressure setting valve on the water pipe ?
  • JUGHNEJUGHNE Member Posts: 6,783
    Back up and take pictures around the boiler.
  • northernsoulnorthernsoul Member Posts: 112
    I can do that - we did just replace the auto feed valve this year
  • northernsoulnorthernsoul Member Posts: 112
    > @JUGHNE said:
    > Back up and take pictures around the boiler.
  • JUGHNEJUGHNE Member Posts: 6,783
    Need to look at the pipes above the boiler.
  • northernsoulnorthernsoul Member Posts: 112
    > @JUGHNE said:
    > Need to look at the pipes above the boiler.
  • JUGHNEJUGHNE Member Posts: 6,783
    Does the sound correlate with the pump operation.
    Can you back up more for pictures....too close.
  • northernsoulnorthernsoul Member Posts: 112
    > @JUGHNE said:
    > Does the sound correlate with the pump operation.
    > Can you back up more for pictures....too close.

    Good question - how long would a pump normally run after it stops heating ? The pump is very quiet so I’ll need to go inspect next time it runs.

    I had thought it was maybe something loose in expansion tank . Hard to isolate sound so far
  • JUGHNEJUGHNE Member Posts: 6,783
    I don't see any flow checks in the pictures.
    They could be hiding somewhere in there though.

    They were to prevent unwanted gravity flow of hot water in parts of the system. The pump pressure would lift a weighed disc in the valve. Sometime not enough pressure to completely lift and produce chatter.
    You may have only one zone however.

    Google "Flow check valves" for pictures.
  • northernsoulnorthernsoul Member Posts: 112
    Thanks I’ll have a look. I had thought maybe it was a loose piece of solder in a pipe or tank rattling
  • Jamie HallJamie Hall Member Posts: 12,689
    It it's really tinkling, and not a lower frequency sound, it might be a little air in there somewhere. Or even expansion -- which might have an almost musical "plink" kind of sound.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • northernsoulnorthernsoul Member Posts: 112
    > @Jamie Hall said:
    > It it's really tinkling, and not a lower frequency sound, it might be a little air in there somewhere. Or even expansion -- which might have an almost musical "plink" kind of sound.

    Yes it’s a high frequency tinkling sound - hard to describe but like a small piece of aluminium rattling in a jar etc.
  • northernsoulnorthernsoul Member Posts: 112
    Well turns out it was a nail from subfloor above that was resting against top of tank so when system was running and vibrating a little it was rattling against nail.

    Whoever did the new floor a few years ago didn’ pay attention to the basement fittings
  • FredFred Member Posts: 8,418

    Well turns out it was a nail from subfloor above that was resting against top of tank so when system was running and vibrating a little it was rattling against nail.



    Whoever did the new floor a few years ago didn’ pay attention to the basement fittings

    You're fortunate they didn't drive a nail into the tank. Glad you got this resolved.
  • northernsoulnorthernsoul Member Posts: 112
    > @Fred said:
    > Well turns out it was a nail from subfloor above that was resting against top of tank so when system was running and vibrating a little it was rattling against nail.
    >
    >
    >
    > Whoever did the new floor a few years ago didn’ pay attention to the basement fittings
    >
    > You're fortunate they didn't drive a nail into the tank. Glad you got this resolved.

    Tell me about it!
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