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RPA ROI Calculator

Radial Piston Agitator ROI Calculator

Use this return on investment (ROI) calculator to estimate the savings possible with Graco’s radial piston agitator in your industrial paint kitchen or paint mix room. Select tabs to view and adjust comparisons between a Graco air motor and a comparable air motor.

Total Savings

Throughout agitator service life:

Per Year:

Assumptions

Total compressed air cost:
years

Energy Costs

$
/kWh
Typically $0.07 to $0.30 (US average $0.10).
Estimate = 4
Typically 0.85 to 0.95

Compressor Costs

$
Based on Ingersoll-Rand UP6-15C-125 BM, 15 HP Rotary Screw Air Compressor 55 CFM @ 125 PSI, 208-230/460-Volt, 3-Phase.
$
$
years

Air Handling Equipment Costs

$
$
$
years

Compressed Air Cost Savings

Daily:
Weekly:
Yearly:
Service Life:

Graco Radial Piston Agitator Compressed Air Costs

Comparable Agitator Compressed Air Costs

Air Lubrication Cost Savings

Savings throughout agitator service life:

Air lubricator costs

$
$

Air Motor Repair/Rebuild/Replacement Cost Savings

Air motor savings throughout agitator service life:

Graco Radial Piston Air Motor Rebuild Costs

Graco recommends 1 re-build for every 500 million accumulated revolutions (about 5 years of operation if the motor runs at 200rpm 24/7).
$
Based on Graco radial piston air motor rebuild kit 25M535.

Comparable Air Motor Repair Costs

$
Based on Graco's rotary vane (GAST 2AM) air motor repair kit 207335.

Comparable Air Motor Replacement Costs

$
Based on Graco's rotary vane (GAST 2AM) air motor 101140.

Air Flow Test Results & Tips

Air Flow Test Results

These tables compare test results between rotary vane and radial piston air motors in two setups:

Scroll horizontally to view all of the data in each table.

55 Gallon Drum
Agitator Manufacturer Motor Manufacturer Motor Type Setup Speed (rpm) Air Pressure (psi) Air Consumption (scfm) Noise (dBa)
Graco GAST Rotary Vane Direct Drive, Oil in 55 gal. drum 100 7 2.5 58
Graco GAST Rotary Vane Direct Drive, Oil in 55 gal. drum 200 17 5.0 67
Graco GAST Rotary Vane Direct Drive, Oil in 55 gal. drum 300 36 9.5 78
Agitator Manufacturer Motor Manufacturer Motor Type Setup Speed (rpm) Air Pressure (psi) Air Consumption (scfm) Noise (dBa)
Graco Graco Radial Piston Direct Drive, Oil in 55 gal. drum 100 4 0.5 52
Graco Graco Radial Piston Direct Drive, Oil in 55 gal. drum 200 9.5 1.0 55
Graco Graco Radial Piston Direct Drive, Oil in 55 gal. drum 300 19 1.5 63
5 Gallon Pressure Pot
Agitator Manufacturer Motor Manufacturer Motor Type Setup Speed (rpm) Air Pressure (psi) Air Consumption (scfm) Noise (dBa)
Graco GAST Rotary Vane Direct Drive, Oil in 5 gal. pressure pot 42 15 3.5 70
Graco GAST Rotary Vane Direct Drive, Oil in 5 gal. pressure pot 60 18 5.0 72
Agitator Manufacturer Motor Manufacturer Motor Type Setup Speed (rpm) Air Pressure (psi) Air Consumption (scfm) Noise (dBa)
Graco Graco Radial Piston Direct Drive, Oil in 5 gal. pressure pot 42 5 Less than 1 51
Graco Graco Radial Piston Direct Drive, Oil in 5 gal. pressure pot 60 8 1.0 52

Air Flow Measurement Tips

Figure 1.1
Figure 1.2

How to take correct air flow measurements in the field

  1. Use an air flow meter that measures in SCFM.
    • Suggest using an inline air flow meter (AW-Lake)(0-12 scfm) (Figure 1.1).
    • Make sure the meter is accurate for the air flow measurement range you require.
  2. Install the air flow meter in the air line before the air motor regulator.
    • For the easiest air flow comparisons between motors, the air flow meter needs to have the same air pressure going into it.
  3. Verify air pressure into the meter by installing an air pressure gauge at the inlet of the meter.
    • Air flow meters are typically calibrated on inlet air pressures of 100 psig.
    • Inlet pressures other than 100 psig to the meter are acceptable, but the measured flow rate needs to be multiplied by a factor to correct to SCFM. The correction factor is usually supplied on a sheet that comes with the meter.

To compare two different air motors, the rpms of the agitator must be the same.

  • Any gear reduced agitator will require you to measure the agitator speed, not the air motor speed.
  • A tachometer that measures shaft speed is required. Recommended model is EXTECH Instruments model 461895 combination contact/photo tachometer (Figure 1.2). It measures rpm using an optical sensor with reflective tape.

Agitator Comparison Videos

Disclaimer

Graco provides the Radial Piston Agitator ROI Calculator as a tool for providing a theoretical estimate of the potential savings possible with a Graco Radial Piston Agitator. The Radial Piston Agitator ROI Calculator does not incorporate such variables as (without limitation): your specific paint system components and their configuration, your environmental factors, or the manner in which you operate your paint system. The ROI Calculator only provides theoretical estimates, and as such, savings are not guaranteed. See warranty disclaimer and limitation of liability for more information.

Success Stories

Annual Energy Savings Exceeds $15,000

Manufacturer also cuts compressed air consumption by 66 percent with Graco’s radial piston agitator.

Success Stories

Compressed Air Use Decreases 80%

Cabinetry maker saves energy costs and improves reliability with Graco radial piston agitator air motor.

Reduce Costs

How to Lower Compressed Air Costs in Your Factory’s Paint Mix Room

More efficient agitator motors and pumps can cut energy bills – and improve the environment.

Agitators

Properly mixing material is the first step in industrial finishing success. Graco offers industrial agitators and agitator motors that fit all kinds of containers and applications.
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