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Air Compressor Free Air Delivery question

  1. Jul 29, 2014 #1
    Hi all,

    Currently I am undertaking a project and I am a little bit confused about the free air delivery (F.A.D.) of an air compressor because I need to purchase an air flow meter and don't want to buy something completely out of the ball park.

    From the information sheet, the compressor has a maximum working pressure of 7.5 bar and produces a FAD of 1.14m^3/min.
    A note on the FAD states that data measured and stated at the following conditions:
    Air intake Pressure - 1 bar a (14.5 psia)
    Air intake Temperature - 20°C (68°F)
    Humidity - 0%(dry)

    With the FAD of 1.14m^3/min, is that the volume flow rate of compressed air or of air that has already expanded back to atmospheric pressure? And in the diagram I supplied, is it reasonable to assume that the air has expanded by the time it reaches the flow meter and the flow rate reading would be approximately equal to the FAD.


    Attached Files:

  2. jcsd
  3. Aug 4, 2014 #2
    I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?
  4. Aug 6, 2014 #3
    Thanks, I think I have that part figured out.

    The compressor I will be using has a maximum working pressure of 7.5 bar, will a flow meter with a max pressure rating of 6.9 bar be ok or should I look for a higher one?

    Edit: I assume that I would just be able to adjust the working pressure of the compressor to under 6.9 bar and I should be fine?
    Last edited: Aug 6, 2014
  5. Dec 9, 2014 #4


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    Gold Member

    I'm not quite sure how that relates to the question.

    edit: This post appears to make no sense because it was in response to a spammer who has been deleted.
    Last edited: Dec 9, 2014
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