Results 1 to 11 of 11
  1. #1
    Join Date
    May 2008
    Location
    Sharjah
    Age
    38
    Posts
    15
    Rep Power
    0

    Question Ammonia Detection Unit



    We are doing plant room for an ammonia, industrial refrigeration plant.

    The Client specifications require am ammonia detection unit with a detection of 5000 ppm, to turn off of non-explosion prrof equipments in the room.

    I have tried with many suppliers for a detection of 5000 ppm. Any supplier with an off scale detection range of 5000 ppm ?

    I enquired Thermal gas, Draeger, MSA, all are having only max detection possible is 1000 ppm of NH3.

    Thanks in advance.



  2. #2
    Join Date
    Jul 2009
    Location
    Switzerland
    Posts
    11
    Rep Power
    0

    Re: Ammonia Detection Unit

    one of this company`s have maybe any solution.

    gfg in switzerland and gf (georg fischer GmbH) in germany

    sry can`t post the URL

    cheers

  3. #3
    Join Date
    May 2007
    Location
    Auckland
    Age
    74
    Posts
    3,362
    Rep Power
    37

    Re: Ammonia Detection Unit

    Double check with your client, 500ppm sounds more like what is required.

  4. #4
    Join Date
    Dec 2007
    Location
    australia
    Posts
    3,356
    Rep Power
    39

    Re: Ammonia Detection Unit

    Believe Australian standard is 1/5 LEL which is 30 000 ppm .
    We suggest only use 1000ppm anyway as it means something is pretty wrong , so shut it down .

  5. #5
    Join Date
    Jan 2006
    Location
    Norway
    Posts
    1,044
    Blog Entries
    4
    Rep Power
    31

    Re: Ammonia Detection Unit

    Monicon has some good 4-20mA detectors, but they only go to 1000 ppm



    why would they want to go to 5000PPM, that's pretty much a lethal dose of ammonia if anyone walked into the room if it was at 4000 ppm.


    on our systems we give a warning and set off the alarm at 250 ppm, then we shut down all ammonia "moving" equipment (pumps compressors etc) at 500 ppm and then we cut all power to the room and start the emergency ventilation at 1000 ppm.


    the DNV regulations say that the cut power and start fan limit is 10.000ppm
    -Cheers-

    Tycho

  6. #6
    Join Date
    Aug 2008
    Location
    ireland
    Posts
    75
    Rep Power
    16

    Re: Ammonia Detection Unit

    Try Murco,just google them.

  7. #7
    Join Date
    May 2008
    Location
    Sharjah
    Age
    38
    Posts
    15
    Rep Power
    0

    Re: Ammonia Detection Unit

    Hi thanks for all the replies.
    However i came across with an option in Honey well.
    Ammonia detection upto 15000 ppm possible by a manual cross calibration procedure.

  8. #8
    Join Date
    May 2007
    Location
    Auckland
    Age
    74
    Posts
    3,362
    Rep Power
    37

    Re: Ammonia Detection Unit

    I still would not be around the place at 15000ppm, absolute explosion waiting to happen.

  9. #9
    Join Date
    Jan 2006
    Location
    Norway
    Posts
    1,044
    Blog Entries
    4
    Rep Power
    31

    Re: Ammonia Detection Unit

    Quote Originally Posted by Magoo View Post
    I still would not be around the place at 15000ppm, absolute explosion waiting to happen.
    No danger of explosion unless you are between 150.000 - 250.000 ppm
    -Cheers-

    Tycho

  10. #10
    Join Date
    Sep 2007
    Location
    Somerset
    Age
    69
    Posts
    4,758
    Rep Power
    46

    Re: Ammonia Detection Unit

    Quote Originally Posted by thejus123 View Post
    Hi thanks for all the replies.
    However i came across with an option in Honey well.
    Ammonia detection upto 15000 ppm possible by a manual cross calibration procedure.
    OK.
    It is time to do some Maths.
    2 values are important.
    1) PPM ( parts per Million)
    2) LEL ( Low Explosion Level ) Exspressed as a Volume percentage, just as Alcohol is!

    Typically within the U.K. most Ammonia Alarms give an Alarm warning at 0.75% of LEL.
    With total shutdown at 1% of LEL.


    And the LEL is 16% = 160,000 PPM (U.K. data applied)

    Therefore Alarm warning is 1,200PPM.
    and Shutdown is 1,600 PPM.
    At 1700 PPM you would get Severe Coughing, cramp, serious irritation to nose, eyes, throat and respiratory system. (30 Min's exposure can lead to death. )

    At 5000 PPM you would get Respiratory spasm. rapid asphyxia (Lethal within a few minutes)

    Data from the Service Engineers section of the Institute of Refrigeration Engineers.

    So please tell us where you are planning to set the alarm at 5,000PPM.
    So that anyone with a Brain can avoid working there!!
    Grizzly

    Sorry just re-read your original post. If the room has just equipment and is never occupied then I suppose 5,000PPM would be acceptable.
    But In the U.K. we safe-guard personnel first equipment second?
    Last edited by Grizzly; 27-10-2009 at 10:26 PM.

  11. #11
    Join Date
    May 2007
    Location
    Pennsylvania
    Age
    51
    Posts
    113
    Rep Power
    17

    Re: Ammonia Detection Unit

    Quote Originally Posted by Tycho View Post
    No danger of explosion unless you are between 150.000 - 250.000 ppm
    My guess is that he was thinking this:

    If my stationary detector is reading 15,000ppm it's quite possible we've got 150,000ppm at the source of the leak.

Similar Threads

  1. LG heat pump problem
    By back2space in forum Heat Pumps
    Replies: 132
    Last Post: 02-02-2009, 12:23 AM
  2. HITACHI RAS Question
    By mourgos in forum Air Conditioning
    Replies: 16
    Last Post: 24-09-2008, 10:27 PM
  3. SL/SB-400 Pump Down Procedures
    By absolute-zero in forum Transport
    Replies: 1
    Last Post: 29-01-2008, 10:27 PM
  4. SR2 50 models electric SBY diagonostics made simple
    By absolute-zero in forum Transport
    Replies: 5
    Last Post: 04-01-2008, 06:11 PM
  5. ammonia refrigeration
    By deepakrbhat in forum Refrigerants
    Replies: 77
    Last Post: 23-04-2004, 12:07 AM

Tags for this Thread

Posting Permissions

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