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Compressed Air; ppm to mg/m3

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  • Compressed Air; ppm to mg/m3

    My question is in reference to ISO 8573.1 standards for compressed air purification:

    I was making a presentation that cited class 1 residual oil as .01 p.p.m. and the specification actually states .01 mg/m3 (as an allowable pollutant in a compressed air stream).

    Assuming ISO standard 20 degrees C and 7 BarG, how does .01 p.p.m. of residual oil convert into .01 mg/m3? Is there a conversion factor I can use? Thanks, Antoine

  • #2
    Re: Compressed Air; ppm to mg/m3

    Originally posted by Unregistered
    My question is in reference to ISO 8573.1 standards for compressed air purification:

    I was making a presentation that cited class 1 residual oil as .01 p.p.m. and the specification actually states .01 mg/m3 (as an allowable pollutant in a compressed air stream).

    Assuming ISO standard 20 degrees C and 7 BarG, how does .01 p.p.m. of residual oil convert into .01 mg/m3? Is there a conversion factor I can use? Thanks, Antoine
    Per Wikipedia, mass of air at 20 C and 101.325 kPa (1.01325 bar) is 1.2041 kg/m.
    At 8.01325 bar (absolute) and 20 C, it would be 9.5226 kg/m. If your ppm is based on mass ratio, it would be .01 mg/9.5226 kg = .001 ppm or 1 ppb. Roughly, you overstated allowable by 10X.

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