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 - 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 | = | 1000 | X | ______14.7 | X | 555 | 14.4 - (0.8153 X .06) | 520 | | | | | | | | | | | | ACFM | = | 1000 | X | 14.7 | X | 555 | | | 13.9 | 520 | | | | | | | | | | | | | | ACFM | = | 1,129 | ACFM | | | | |
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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