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  1. #1
    Join Date
    Sep 2020
    Location
    Australia
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    Air in ammonia system



    Hi all

    System runs in a vacuum due to blast freezer setups. Just wondering how does one locate the leak? Thanks



  2. #2
    Join Date
    Jun 2017
    Location
    Norway
    Posts
    32
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    Re: Air in ammonia system

    Stop the system/increase suction pressure to observe ammonia leak, or shut one circuit off to determine if the circuit still is sucking in air.
    Normal places of leakage might be compressor shaft seal, valve flanges etc..

  3. #3
    Join Date
    Jul 2006
    Location
    USA
    Age
    73
    Posts
    867
    Rep Power
    26

    Re: Air in ammonia system

    I assume your issue is rising head pressure.
    How long does it take under vacuum to cause problems?
    As HwT mentioned the first step is to raise the head pressure and look for a leak. Sulfur sticks are my preferred method.
    You can have a leak which does not show up under positive pressure. That make it more difficult.
    As an example I had a operator leave a hand oil pump connect to a Mycom piston compressor, which was not unusual. Unfortunately he forgot to close the crankcase valve. It did not show up until the next morning. The night shift operator restarted to drop the product temp before the product was cased. At the deeper vacuum level it overcame the head of the oil and drew it all into the machine, followed by a lot of air. As I was going around looking for the issue I noticed that the crankcase was overfilled. Shut off the valve and started purging!

  4. #4
    Join Date
    Oct 2016
    Location
    Serbia
    Age
    51
    Posts
    110
    Rep Power
    8

    Re: Air in ammonia system

    By my experience in vacuum system if you have more than one unit and one of this its not in operation I found that air come in the system through shaft seal on compressor.
    I find that many times.

  5. #5
    Join Date
    Sep 2020
    Location
    Australia
    Posts
    11
    Rep Power
    0

    Re: Air in ammonia system

    Ok thanks guys. Good information right here. Will look more into it

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