Air Compressor basics

ompressed air is STORED ENERGY. The amount of this stored energy, or the ability of the compressor to supply this energy is expressed in both Volume(CFM) and Pressure(PSI). These two parameters would enable you to determine the Horse Power (HP) of your compressor. Once you decide how much CFM you require and at what PSI, we can suggest you what compressor would be suitable for you. As a Thumb Rule: 1 HP=approximately 4cfm@ 90 PSI (6 to 7 kg/cm2) .

We will now demonstrate how to determine which compressor would be suitable for you.

Step 1 :

Read the specification of the machine which required compressed air. Most of the equipment manufacturers specify the CFM and the pressure requirement for each equipment.

Step 2 :

Add the CFM’s for all the equipments. Multiply the total CFM requirement by 1.3 to account for line leakage and losses.

Step 3 :

Estimate the highest pressure requirement by each machine and again multiply that amount by 1.3 to account for pressure variation.

Step 4 :

Note down the Volume in terms of CFM (Cubic Feet per Minute) or LPM (Liters per Minute). Similarly note down the pressure requirement in terms of PSI (Pounds per Square Inch) or Kg/cm2.

Step 5 :

Click here .

Basic Conversions

  • 1 HP = 0.735 KW
  • 1 CFM = 28.238 LPM
  • 1 Kg/cm2 = 14.223 PSI
  • 1 MPa = 10 Bar
  • 1 Bar = 1.0193 Kg/cm2
  • 1 Kg = 2.205 Lbs

Abbreviations Used

  • CFM: Cubic Feet per Minute
  • LPM: Liters per Minute
  • PSI: Pounds per Square Inch
  • HP: Horse Power
  • KW: Kilo Watt
  • MPa: Mega Pascal
  • Lbs: Pounds