Results 1 to 5 of 5
  1. #1
    Nizar's Avatar
    Nizar Guest

    Moisture in Propane Liquid



    Greetings to all


    We normally recieve propane in trucks but it does have some moisture.

    How can I find:

    1. The saturation temperature of moisure (water) in Propane liquid? can I use The Psychrometric chart?

    2. Henry's law constant for water?

    Thanks



  2. #2
    Join Date
    Mar 2006
    Location
    Merate (LC) - Italy
    Age
    52
    Posts
    2,554
    Rep Power
    24

    Re: Moisture in Propane Liquid

    Refrigeration grade propane doesn't have any appreciable water content.

  3. #3
    Join Date
    Jun 2005
    Location
    S****horpe
    Age
    51
    Posts
    135
    Rep Power
    19

    Re: Moisture in Propane Liquid

    Low grade propane may do though. You could send a sample for analysis, or a simple field test is called the valve freeze test, where you discharge some propane through a valve and time how long it takes to freeze up, the wetter it is the quicker it will freeze. This would be an IP/ASTM type of test, obviously you need the right type of valve etc., but it will all be in the relevant standard. It's not very accurate but it's the easiest.

    Just looked it up, see ASTM D2713-91 (2001) for details.
    It's a lovely day to pump some gas

  4. #4
    Nizar's Avatar
    Nizar Guest

    Re: Moisture in Propane Liquid

    It does have ppm level of moisture.

  5. #5
    Join Date
    Jun 2005
    Location
    S****horpe
    Age
    51
    Posts
    135
    Rep Power
    19

    Re: Moisture in Propane Liquid

    I have a section of an article someone gave me - no idea where from though:

    Temperature ppm saturated level in liquid propane
    -40C 3ppm
    -30 5
    -15 13
    +6C 44
    +15 75
    +30 173
    +45 360

    Note that for low temps (below zero) the vapour holds about 20 times more moisture than liquid, this is about 10 times around ambient temperature. I also have some data from GE Sensing which shows higher saturation levels (liquids) - note sure which is more accurate.

    Hope this helps
    It's a lovely day to pump some gas

Similar Threads

  1. Suction gas <-> liquid line heat exchange and performance gains
    By DaBit in forum Technical Speculations
    Replies: 30
    Last Post: 18-05-2010, 01:52 PM
  2. Liquid line for multi evaporators
    By Kevin Yeo in forum Supermarket Refrigeration
    Replies: 1
    Last Post: 29-12-2005, 03:29 PM
  3. Parker levels in ammonia systems
    By Friobernal in forum Industrial
    Replies: 3
    Last Post: 04-08-2005, 03:46 PM
  4. Liquid Refrigerant Pumping
    By bersaga in forum Technical Discussions
    Replies: 34
    Last Post: 09-08-2003, 08:07 PM

Posting Permissions

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