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Compressors
We have an elaborate library of air and gas compression resources available to share with you.  The most frequently requested information is listed below.  Please call or email us regarding any of these topics.

 

Rules of Thumb

Formulas

Air Consumption Rates for Most Common Tools

Modes of Control

Rules of Thumb

  • 1 HP = 4.5 CFM @ 125 PSIG discharge pressure
  • Most water-cooled aftercoolers will require about 3 GPM per 100 CFM of compressed air @ 100 PSIG.
  • Every 2 PSIG change in pressure equals 1% change in HP.
  • Amperage Draw
    • Single Phase     115V - 10 AMP/HP:  230 V - 5 AMP/HP
    • Three Phase      230V - 2-1/2 AMP/HP:  460V - 1-1/4 AMP
          

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Formulas

  • Is your compressor providing the flow it is published to deliver?
  • Pump Up Equation is used to calculate how long it will take to fill an air receiver to a specified pressure.
T min =
(1 GAL / 7.48 ft^2)(Diff. Pressure)
(Atmospheric Pressure in PSI X Delivery Volume of compressor in CFM)

 

    • Example:  How long does it take to pump up a 120 gallon tank from 0 PSIG to 100 PSIG with a 50 CFM compressor?  The calculation requires the knowledge of the atmospheric pressure.  At sea level, atmospheric pressure is 14.7 PSI.  As the altitude rises, the atmospheric pressure will decrease.  In the Mid Atlantic, we generally use 14.5 PSI.
T min =
(120/ 7.48) (100)
(14.5 X 200)
   
T min =
2.21 minutes

 

  • Conversion of SCFM to ACFM
ACFM
=
SFCM
X
_____Pstd            
X
_T1 ��R  
P1 - (Pvp X RH)
Tstd ��R
ACFM
=

Actual Cubic Feet per Minute

SCFM
=
Standard Cubic Feet per Minute
P1
=
inlet pressure in PSIA
Pvp
=
partial vapor pressure of air at P1 & T1
RH
=
relative humidity  at site conditions
T1
=
inlet temperature
��R
=
��F + 460  (Renkin Scale)
Tstd
=
60��F + 460 = 520 ��R
 
    • Example:  What size should the compressor be for a process that requires 1000 SCFM? (Site Conditions: 14.4 Bar Pressure, 95 ��F, 60% Relative Humidity; STD Conditions: 14.7 Bar Pressure, 60��F, 0% Relative Humidity)
    ACFM=1000X______14.7                 X555
    14.4 - (0.8153 X .06)
    520
             
    ACFM=1000X14.7X
    555
      
    13.9
    520
     
             
    ACFM=1,129ACFM    

 

Air Consumption Rates for Most Common Tools

  • Air Consumption Chart (Automotive Service Shops)
CFM Required to Operate Various Pneumatic Equipment, for average service shop usage factor.
Equipment Air Pressure Range (PSI)
Portable Tools
Compressor CFM Required per unit
Equipment Air Pressure Range (PSI)
Portable Tools
Compressor CFM Required per unit
70 - 100
Air Filter Cleaner**
3.0
Hammers
70 - 100
Body Polisher**
20.0
90 - 100
Air Hammer**

4.0

70 - 100
Body Sander (Orbital)**
10.0
90 - 100
Tire Hammer
12.0
70 - 100
Brake Tester
4.0
125 - 150
Bread Breaker
12.0
70 - 100
Carbon Remover**
3.0
90 - 100
Spring Oiler
4.0
90 - 100
Dusting Gun (blow gun)
2.5
70 - 100
Panel Cutter
4.0
Spray Guns
70 - 90
Drill, 1/16" - 3/8"
4.0
90 - 100
Engine Cleaner**
5.0
70 - 90
Impact Wrench 3/8" sq dr**
3.0
90 - 100
Production Paint Spray Gun**
8.0
70 - 90
Impact Wrench 1/2" sq dr**
4.0
90 - 100
Touch Up Paint Spray Gun**
4.0
70 - 90
Impact Wrench 5/8" sq dr**
5.0
90 - 100
Undercoat Paint Spray Gun**
19.0
70 - 90
Impact Wrench 3/4" sq dr**
8.0
70 - 90
Impact Wrench 1" sq dr**
12.0
Other Equipment
70 - 90
Die Grinder**
5.0
120 - 150
Grease Gun**
3.0
90 - 100
Vertical Disc Sander**
20.0
145 - 175
Car Lift^
6.0
90 - 100
Filing and Sawing Machine, Small**
3.0
125 - 150
Floor Jacks
6.0
90 - 100
Filing and Sawing Machine, Large**
5.0
120 - 150
Pneumatic Garage Door
3.0
90 - 100
Burring Tool
5.0
90 - 100
Radiator Tester
1.0
90 - 100
Spark Plug Cleaner
5.0
Tire Tools
90 - 100
Spark Plug Tester
0.5
125 - 150
Rim Stripper
6.0
70 - 100
Transmission Flusher
3.0
125 - 150
Tire Changer
1.0
70 - 100
Fender Hammer**
9.0
125 - 150
Tire Inflation Line
2.0
70 - 100
Car Washer**
9.0
125 - 150
Tire Spreader
1.0
70 - 100
6" Medium Duty Sander**
40.0
125 - 150
Vacuum Cleaner
7.0
      
^ This is for 8,000 lbs capacity.  Add 0.65 CFM for each 1,000 lbs capacity over 8,000 lbs.
** These devices are rated based upon typical "on-load" performance characteristics.
Always check with tool manufacturers for actual consumption of tools being used.  The above is based on averages and should not be considered accurate for any particular make of tool.

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Modes of Control

This information is not available online at this time.  Please call or email us to request information on this topic.

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