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SCFM (Standard CFM) vs. ACFM (Absolute CFM)
       
Vapor Pressure Chart (VPC1)   Elevation Versus Atmospheric Pressure Chart  
Temp Press Temp Press Temp Press Temp Press Temp Press Temp Press   Elev(ft) PSIA "HgA Elev(ft) PSIA "HgA Elev(ft) PSIA "HgA Elev(ft) PSIA "HgA  
°F PSIA °F PSIA °F PSIA °F PSIA °F PSIA °F PSIA   0 14.7 29.92 1800 13.76 28.02 3600 12.87 26.22 5400 12.04 24.52  
t p t p t p t p t p t p   100 14.64 29.81 1900 13.71 27.92 3700 12.82 26.13 5500 11.99 24.43  
32 0.08859 47 0.15909 63 0.285 79 0.4909 95 0.8162 111 1.3133   200 14.59 29.7 2000 13.66 27.82 3800 12.78 26.03 5600 11.95 24.34  
32.018 0.08866 48 0.1652 64 0.2952 80 0.5073 96 0.8416 112 1.3516   300 14.53 29.6 2100 13.61 27.72 3900 12.73 25.94 5700 11.9 24.25  
33 0.09223 49 0.17151 65 0.3057 81 0.5241 97 0.8677 113 1.3909   400 14.48 29.49 2200 13.56 27.62 4000 12.68 25.84 5800 11.86 24.16  
34 0.09601 50 0.17803 66 0.3165 82 0.5414 98 0.8945 114 1.4311   500 14.42 29.38 2300 13.51 27.51 4100 12.63 25.74 5900 11.81 24.07  
35 0.09992 51 0.18477 67 0.3276 83 0.5593 99 0.922 115 1.4723   600 14.37 29.28 2400 13.46 27.41 4200 12.59 25.65 6000 11.77 23.98  
36 0.10397 52 0.19173 68 0.3391 84 0.5776 100 0.9503 116 1.5145   700 14.32 29.17 2500 13.41 27.31 4300 12.54 25.55 7000 11.33 23.09  
37 0.10816 53 0.19892 69 0.351 85 0.5964 101 0.9792 117 1.5578   800 14.26 29.07 2600 13.36 27.21 4400 12.5 25.46 8000 10.91 22.22  
38 0.1125 54 0.20635 70 0.3632 86 0.6158 102 1.009 118 1.6021   900 14.21 28.96 2700 13.31 27.11 4500 12.45 25.36 9000 10.5 21.38  
39 0.117 55 0.214 71 0.3758 87 0.6357 103 1.0395 119 1.6475   1000 14.16 28.86 2800 13.26 27.01 4600 12.4 25.27 10000 10.1 20.58  
40 0.12166 56 0.2219 72 0.3887 88 0.6562 104 1.0708 120 1.694   1100 14.11 28.75 2900 13.21 26.91 4700 12.36 25.17 11000 9.71 19.75  
41 0.12648 57 0.2301 73 0.4021 89 0.6772 105 1.1029 121 1.7417   1200 14.06 28.65 3000 13.16 26.81 4800 12.31 25.08      
42 0.13146 58 0.2386 74 0.4158 90 0.6988 106 1.1359 122 1.7904   1300 14.01 28.54 3100 13.11 26.71 4900 12.27 24.98      
43 0.13662 59 0.2473 75 0.43 91 0.7211 107 1.1697 123 1.8404   1400 13.96 28.44 3200 13.06 26.61 5000 12.22 24.89      
44 0.14196 60 0.2563 76 0.4446 92 0.7439 108 1.2044 124 1.8915   1500 13.91 28.33 3300 13.02 26.52 5100 12.17 24.8      
45 0.14748 61 0.2655 77 0.4596 93 0.7674 109 1.2399 125 1.9438   1600 13.86 28.23 3400 12.97 26.42 5200 12.13 24.71      
46 0.15319 62 0.2751 78 0.475 94 0.7914 110 1.2763 126 1.9974   1700 13.81 28.13 3500 12.92 26.32 5300 12.08 24.61        
     
  SCFM TO ACFM   SCFM of Compressor  
    PS ATM (Std. as indicated by CAGI/ASME or mfg. specs)  
    RHS (Std. as indicated by CAGI/ASME/MFG. expressed as a decimal value)  
    PVs = Saturated vapor press. of water at std. temp. From VPC1   
    Pb = Atmospheric pressure - barometer (PSIA)  
    RHa = Actual relative humidity measured at site as a decimal value  
  Ps = Standard pressure (PSIA)           PVa = Saturated vapor press. of water at actual temp. From VPC1  
  Pb = Atmospheric pressure - barometer (PSIA)       Ta = Actual temperature (°F) From VPC1   
  Pa = Actual pressure (PSIA)       Ts = Std. Temp. (°F) as indicated by CAGI/ASME/MFG   
  RHs = Standard relative humidity       Pb = Atmospheric pressure - barometer (PSIA)  
  RHa = Actual relative humidity       Pa = Actual pressure (PSIA) (ATM Press. minus inlet filter/silencer Delta P *  
  PVs = Saturated vapor pressure of water at standard temperature (PSI)1      
  PVa = Saturated vapor pressure of water at actual temperature (PSI)1   ACFM    
  Ts = Standard temperature (°R) NOTE: °R =°F+460        
  Ta = Actual temperature (°R)1: See vapor pressure chart >       Indicates Standard values from CAGI/ASME/MFG  
      * New inlet filter specifications from MFG. Example: Solberg FS-19P-125 3.82" h20 = .14psid  
     
                                                   
Contact Accurate Air Engineering, Inc for options to correct your compressed air systems inefficiencies