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17/01/2015 Conversions http://www.sigmacompressors.co.za/conversions2.asp 1/2 SYMBOLS & CONVERSIONS Common symbols and terms used in the measurement of compressed air volumes M3/Min = Cubic metres per minute M3/Hr = Cubic metres per hour L/S = Litres per second L/Min = Litres per minute To convert from Metric Measurement to C.F.M use the following factors: M3/Min x 35.32 = C.F.M. M3/Hr x 0.589 = C.F.M. L/S x 2.12 = C.F.M. L/Min x 0.0353 = C.F.M. L/S x M/Min x 0.06 L/S x M/Hr x 3.6 To calculate volume of air from kilowatt / Horsepower KW x 5.2 = C.F.M. HP x 4.2 = C.F.M. To calculate number of AMPS drawn by electrical motors A) 380 volt supply KW x 2 = AMPS. B) 525 volt supply KW x 1.8 = AMPS. To calculate starting AMPS A) Star Delta AMPS x 3 B) Direct on load AMPS x 6

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17/01/2015 Conversions

http://www.sigmacompressors.co.za/conversions2.asp 1/2

  

 

 

 

 

 

 

 

 

 

SYMBOLS & CONVERSIONS Common symbols and terms used in the measurement ofcompressed air volumes M3/Min        =   Cubic metres per minuteM3/Hr         =    Cubic metres per hourL/S             =    Litres per secondL/Min          =    Litres per minute To convert from Metric Measurement to C.F.M use thefollowing factors: M3/Min        x     35.32    =          C.F.M.M3/Hr         x     0.589    =          C.F.M.L/S             x     2.12      =          C.F.M.L/Min          x     0.0353  =          C.F.M. L/S             x     M/Min   x           0.06L/S             x     M/Hr     x           3.6 To calculate volume of air from kilowatt / Horsepower KW x 5.2     =    C.F.M.HP x 4.2      =    C.F.M. To calculate number of AMPS drawn by electrical motors A)         380 volt supply               KW x 2    =    AMPS.B)         525 volt supply               KW x 1.8 =    AMPS. To calculate starting AMPS A)         Star Delta                      AMPS    x    3B)         Direct on load                AMPS    x    6