cast iron radiator

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Eagle71, Oct 27, 2013.

  1. Eagle71

    Eagle71 New Member

    Joined:
    Aug 15, 2012
    Location:
    Nj
    Hello all. I need to remove a cast iron radiator next month for a bath remodel. I've done this many times but not during cold weather when the system needs to be on during renovations. I initially thought I could take out the radiator and plug the unions, but apparently there are differing opinions on this. I read that some people plug and others put a jumper pipe in between the two. I don't see the problem with plugging the supply and return since closing the valve somewhat does this anyway. What to do? thanks
     
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    If the radiator has a valve, then you have a "main pipe" system and you can cap the risers. IT is when you have a "continuous" loop that a jumper has to be installed, but that type of system does not have individual valves.
     
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  4. Eagle71

    Eagle71 New Member

    Joined:
    Aug 15, 2012
    Location:
    Nj
    Thanks man. That's what i thought. Just wanted to be sure.
     
  5. Eagle71

    Eagle71 New Member

    Joined:
    Aug 15, 2012
    Location:
    Nj
    I removed the rad yesterday and capped off both copper lines. Then refilled and bled system. Just curious though, now that there is some air trapped in those two capped pipes will it adversely affect the system?
     
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    IF you've got flow everywhere, the air in there will eventually be absorbed into the water and purged out, but that could take months. I doubt there is enough volume in those pipes to affect the water pressure much, or enough trapped oxygen to be much of an issue. I'd monitor the pressure over the first couple of weeks, but you'll probably not notice...depends on how the expansion tank is setup whether the volume change would make any difference...probably not.
     
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