Results 1 to 13 of 13
  1. #1
    Join Date
    Dec 2010
    Location
    Greece
    Posts
    177
    Rep Power
    7

    checking a compressor



    hello!!
    I want your opinion about the way I tried to test a compressor.

    I wanted to know if a compressor was broken and I put a manometer at its discharge pipe.

    I took as a result high pressure 14.8 bar and then I stopped the compressor.

    I noticed that the pressure had the ability to remain at that point (14.8 bar) for about a quarter of time.

    Then I was sure that the compressor was ok!

    What is your opinion about testing a broken compressor.

    Thanks!20130902_144656.jpg



  2. #2
    Join Date
    Dec 2010
    Location
    Greece
    Posts
    177
    Rep Power
    7

    Re: checking a compressor

    notice : I had already removed all the pipe connections from the compressor and the discharge pipe of the compressor was directly connected on my manometer.

  3. #3
    moideen's Avatar
    moideen is offline Veteran Poster I am starting to push the Mods: of RE
    Join Date
    Apr 2008
    Location
    u.a.e
    Age
    42
    Posts
    417
    Rep Power
    16

    Re: checking a compressor

    I think you are trying to test your compressor. I don’t know what you mean “broken compressor”. I think you mean the seating of compressor valves. If pressure is steady for a while; your compressor valves are ok.
    Last edited by moideen; 03-09-2013 at 12:25 PM.

  4. #4
    Join Date
    Aug 2007
    Location
    Adelaide Australia
    Age
    63
    Posts
    538
    Rep Power
    17

    Re: checking a compressor

    If as moideen has said you are referring to the valves then the best way would be to see if you can get the suction into a vacuum say -50 kpa by closing the suction stop valve and see how quickly the pressure rises, make sure any oil return is shut.
    This will give you some idea on the condition of the suction valves and will tell you if the discharge valves are sealing.
    If you only look at the discharge pressure this could give you a false reading if the discharge check / non return valve is leaking as the discharge pressure will stay high for a long time.
    If in doubt the best way is to lift the heads and visually inspect valves for broken rings.
    Regards
    Paul

  5. #5
    Join Date
    Dec 2010
    Location
    Greece
    Posts
    177
    Rep Power
    7

    Re: checking a compressor

    worth mentioning, I used this method on a domestic refrigerator charged with R-134.

  6. #6
    Join Date
    Jan 2008
    Location
    north west
    Age
    35
    Posts
    234
    Rep Power
    12

    Re: checking a compressor

    I would say you have proved the compressor does pump to a certain degree but not that it's pumping efficiently or enough for the refrigeration system to work.
    The last thing to leave an engineer is pride!!

  7. #7
    Join Date
    Oct 2007
    Location
    manchester
    Age
    44
    Posts
    5,707
    Rep Power
    39

    Re: checking a compressor

    usually u test on the low side to ensure it will pull a 13 inch vac- within a minute- 2 minutes if its on the system- and see if it holds when stopped

  8. #8
    Join Date
    Dec 2010
    Location
    Greece
    Posts
    177
    Rep Power
    7

    Re: checking a compressor

    ok. I used that method because I was taught it at a seminar related to inspect malfunction on compressor and its valves.
    Does any of you have any special document about all mentioned methods above?

  9. #9
    Join Date
    Oct 2007
    Location
    manchester
    Age
    44
    Posts
    5,707
    Rep Power
    39

  10. #10
    Join Date
    Dec 2010
    Location
    Greece
    Posts
    177
    Rep Power
    7

    Re: checking a compressor

    Thanks a lot!

  11. #11
    Join Date
    Jan 2007
    Location
    India
    Posts
    60
    Rep Power
    12

    Re: checking a compressor

    Remove the piping’s except condenser and connect the pressure gauge at the condenser out let . Supply nitrogen or dry air at 2 bar pressure thru the compressor suction tube. Run the compressor until pressure builds up to 12 bar in teh condenser then stop the supply and switch off the compressor. Check the leak back for a minute; if the leak back reading is more than 2 bar then you can conclude as pumping failure


  12. #12
    Join Date
    Aug 2013
    Location
    USA
    Posts
    7
    Rep Power
    0

    Re: checking a compressor

    I think you need to get gauges calibrated in PSIG because 1 BAR is too large a degree of change with respect to refrigeration work.

  13. #13
    Join Date
    Nov 2013
    Location
    Canada
    Posts
    10
    Rep Power
    0

    Re: checking a compressor

    Quote Originally Posted by Greek_engineer View Post
    hello!!
    I want your opinion about the way I tried to test a compressor.

    I wanted to know if a compressor was broken and I put a manometer at its discharge pipe.

    I took as a result high pressure 14.8 bar and then I stopped the compressor.

    I noticed that the pressure had the ability to remain at that point (14.8 bar) for about a quarter of time.

    Then I was sure that the compressor was ok!

    What is your opinion about testing a broken compressor.

    Thanks!20130902_144656.jpg
    In my opinion Change the piping and bottom valves to check broken compressor working.While checking it attached another compressor on it and see the difference between both,you can easily check and find its working performance.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •