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Draining a hydronic loop to cap pipes

Steve Garson_2Steve Garson_2 Member Posts: 634
I am doing some demolition work in my kitchen. My heating contractor will be delayed in coming over to move the copper pipes feeding a radiator that will be removed for a new doorway.

I'm experienced sweating joints, so I would like to cap the two pipes to avoid holding up the carpenters, but I know that the pipes will need to not have fluid in them. Since the radiator in question is on the 1st floor and I have 2 stories, I can close off the loops for the 2nd floor. But do I have any alternative to draining the 1st floor loop? I am guessing that to refill it could be a pain with air bubbles.

Any tips?

Steve from Newton, MA


  • Jamie HallJamie Hall Member Posts: 13,398
    If this is going to be really temporary, may I suggest an heretical idea? Get yourself a couple of SharkBite caps the proper size to fit -- and a sponge. Don't drain anything. Cut the pipes (use a really good tubing cutter) and quick like slap a SharkBite on there. With any kind of luck at all you won't get enough air in the system to need to purge, except for the one section you have played with. You will get wet. If you're quick, you won't even get that wet.
    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
  • Steve Garson_2Steve Garson_2 Member Posts: 634
    Thanks, Jamie. Great idea!
    Steve from Newton, MA
  • Steve Garson_2Steve Garson_2 Member Posts: 634
    Worked perfectly. Lost perhaps 8oz of water in the process.
    Steve from Newton, MA
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