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  1. #1
    Join Date
    Jan 2009
    Not in Iran

    Hey guy., check out this question!!!

    Looking at a project, project includes change butterfly Nd new pump,
    Instead of draining building, I heard of a practice that freezes the pipe for a few hours to be able to change valves., awesome .
    What u guys think?
    no signature blast'em man blast'em

  2. #2
    Join Date
    Apr 2005
    They use it on ship pipes all the time.
    Jason J Saylor
    Inspection Experts INC
    Facilities Manager
    East Coast Division

    "You will encounter many distractions and many temptations to put your goals aside: The security of a job, a wife who wants kids, Whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
    Larry Flynt quote

  3. #3
    Join Date
    Mar 2011
    Los Angeles, CA
    this is off topic.....but how much hvac work is there in ship building? i have been doing hvac for buildings for a while and it doesnt rock my boat as it used to do. Trying to see what else is there.

  4. #4
    Join Date
    Mar 2007
    Yes, it's possible. It's not cheap, though.
    The key to happiness is lower expectations.

    Don't pick the fly crap out of the pepper.

  5. #5
    Join Date
    Jul 2007
    The Hot South
    It works great but isn't cheap on large diameter pipe. You can buy a kit for small dia pipe (under 3/4") for about $500 and do it yourself. There's companies that specializing in pipe freezing for large dia pipe.

  6. #6
    Join Date
    Dec 2006
    new england
    We have a freeze machine at our shop. It works great in the right situation. Alot of times it can't be utilized because you need room around the pipe to set it up.

  7. #7
    Join Date
    Jul 2001
    have a back-up plan just in case the machine quits. We had one fail once and it was UGLY.
    Saving the service call at a time.

  8. #8
    Join Date
    Aug 2009
    Fort Lauderdale Fl
    I have frozen pipes the biggest being 6" using a rig we made at the shop and getting dewars of liquid nitrogen. If you wanna see some pics ill send some to you but it wont be until monday

    Basically I took and 8" 18" long peice of pipe welded flat plate on each end cut a 6" hole in both ends. Then I cut that down the middle put flanges on it so it could be bolted back together to wrap arounf the pipe. use a weldolet to hook a hose with a valve on it to hook to the dewar of LN and have an exhaust port on the other end. then you put some temp probes in the collar you made and start bleeding the LN into the collar as it boils it off it will get cold quick down around -200 or colder you have to moniter the temp regular basiclly one man just for this. Ice plug complete

  9. #9
    Join Date
    Apr 2007
    we have the setup, we used it on domestic water supplies more often than hvac we did a 20" line feeding a paper plant and the incoming pressure was 60 psi and live. the city couldnt shut down water for two months sinceit was an industrial site and everyone else needed wqater
    we have our own setup but we rented two more so we froze the same line at three spots for safety reasons .
    all of these ran off liquid co2 and we had so many tanksnit was comical. we had 8 guys workimg that weekend

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