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How can i calculate pressure drop in air compressor?

  1. Sep 3, 2013 #1
    hi friends,
    I am confused with incompressible and compressible flow.Can i use moody diagram for air compressor.How can i calculate pressure drop in pipe.
     
  2. jcsd
  3. Sep 3, 2013 #2

    SteamKing

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    As long as the velocity of the air flow < 0.3 Mach, the incompressible flow equations (Darcy-Weisbach) can be used to calculate pressure drop in a piping system. Once speed > 0.3 Mach, then a different analysis using compressible flow is called for.

    I don't know what you mean by 'Can I use moody diagram for air compressor?'

    Crane Technical Paper 410 covers some simple compressible flows for air and other gases. It's worth laying your hands on a copy.
     
  4. Sep 3, 2013 #3
    I found a formula from atlas copco manual
    p1-p2=(450*(q^1,85)*L)/((d^5)*p)
    q=air flow (l/s)
    d=internal pipe diameter(mm)
    l=length of the pipe bar(a)
    p=absolute initial pressure

    atlas copco products air compressor.Can i use this formula to calculate pressure drop in pipeline?
     
    Last edited: Sep 3, 2013
  5. Sep 3, 2013 #4

    SteamKing

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    It's worth a shot. Remember, pressure is in units of bars.
     
  6. Sep 4, 2013 #5
    air compressor Q=2,6m^3/min D(diameter)=50mm P(pressure)=7,5Bar

    V=Q/A ---> V=4*(2,6/60)/(3,14*0,05^2)

    V=22,08m/s MACH=22,08/340=0,064

    Can i use incompressible flow equations(DARCY-WEİSBACH)?
     
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