Below are the details of how Herkules Equipment Corporation calculates cubic feet per minute (CFM) and standard cubic feet per minute (SCFM) for our pneumatic scissor lift tables. CFM and SCFM can be calculated based on a variety of standards. We believe the below calculations work best in most cases.

Given:

  Volume:                                     4.7 ft3 Lift table is full up

  Pressure:                                    50 psi Lift table is full up and maximum load

  Atmospheric pressure (ATM):    14.7  Constant

  Cycles / minute:                       0.0167 Calculated below

Terms:

  ATM: Atmospheric pressure:

  CFM: Cubic Feet per Minute

  SCFM: Standard Cubic Feet per Minute

Formulas:

  1 TRUE pressure (psia)            = Pressure + ATM

  2 Actual Pressure (ft3 TRUE)  = (Volume * True psi) / ATM

  3 CFM max.                              = (ft3 TRUE) / minutes

  4 SCFM                                     = (Pressure * Volume * cycles/minute) / Raise time

Calculations:

Cycle Sequence

Air consumption units are per minute:           Inputs

a. Speed for full raised:                                 20 Seconds              = 0.3333 Minutes

b. Lift sets ideal at full raised for:               3600 Seconds            = 60.000 Minutes

c. Number of cycles per minute: 1 Cycles per hour/60 minutes = 0.0167 cycles / minute

TRUE pressure:

              TRUE pressure = 50 psi + 14.7 psi

                                        = 64.7 psia

Actual pressure:

               Actual Pressure = (4.7 ft3 X 64.7 psia) / 14.7 psi

                                          = 20.69 ft3 TRUE

Cubic Feet Per Minute Maximum:

                       CFM max. = (20.69 ft3 TRUE) / .333 minutes

                                          = 62.06

Standard Cubic Feet Per Minute:

                             SCFM = (20.69 ft3 TRUE X 0.01667 cycles / minute)  / 0.33 minutes

                                        = 1.04

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2. Herkules Pneumatic Scissor Lift Table with Tilt and Rotate
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