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FORMULAS
Formula to calculate the cost of compressed air:
BHP x .746 x hours x electric rate/Motor Efficiency Conversion of scfm to acfm:  Where: Ps = Standard pressure, psia (CAGI & ISO use 14.5 psia) Pa = Atmospheric pressure, psia ppm = Partial pressure of moisture at atmospheric temperature RH = Relative humidity Ta = Atmospheric Temperature, °F Ts = Standard Temperature, °F (CAGI and ISO use 68 °F) (CAGI and ISO standard is at zero RH) |