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Achieving Efficiency in Abrasive Blasting

Achieving Efficiency in Abrasive Blasting. William P. Nelson Schmidt Engineered Abrasive Systems. Sponsored by:. What is the Definition of “Efficiency”?.

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Achieving Efficiency in Abrasive Blasting

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  1. Achieving Efficiency in Abrasive Blasting William P. Nelson Schmidt Engineered Abrasive Systems Sponsored by:

  2. What is the Definition of “Efficiency”? • Abrasive blasting is defined as a controlled erosion process whereas your productivity is measured by how much area is blasted, in what time frame and by using how much abrasive

  3. What is Abrasive Blasting? • “To combine the energy of compressed air with a granular abrasive, which is propelled to impact a surface in a controlled, repeatable and predictable surface preparation method.”

  4. Enemies of any Air Blast System • Insufficient air supply • Moisture • Pressure drop

  5. Enemy #1Insufficient Air Supply • You lose 1.5% of productivity for every 1 psi reduction in blast nozzle pressure (As stated in research by NACE)

  6. Enemy #1Insufficient Air Supply (All figures are approximate)

  7. Enemy #2Moisture • Increased operating costs • Increased material costs • Decreased operating efficiencies • Reduced productivity

  8. Enemy #2Moisture How does water get into the compressed air? • All air contains moisture • As the air is compressed, any moisture in it will also be compressed • As you compress the air/moisture, it heats up • Hot air retains moisture remaining a vapor So…How do you remove moisture?

  9. Enemy #2Moisture Convert moisture from a vapor to a solid (water droplets) HOW? By cooling the air you can then remove the moisture: ► By expansion (Moisture Trap) ► Use of radiator (ACS) Once the air is cooled, you have to separate it: ► Demister Pad ► Centrifugal ► Absorption / Adsorption

  10. Enemy #2Moisture Aftercooler System 3” Air Inlet 1) 3” Outlet 2) 2” Outlet 4) 1” Outlet

  11. Water Volume in Air 1500 CFM Air Compressor 200° 90° 270 gal./day 90 Gal/day 180 Gal/day 75° Ambient Air 75% RH Enemy #2Moisture

  12. Enemy #3Pressure Drop • Nozzles • Hoses; Blast & Air • Restrictive Piping

  13. Enemy #3Pressure Drop

  14. Nozzle Wear

  15. Hoses & Set-Up

  16. Enemy #3Pressure Drop Auto Air Valve

  17. Enemy #3Pressure Drop High-Flow Auto Air Valve

  18. Proper Set-Up

  19. Difference of Control System Types PRESSURE HOLD NON-PRESSURE HOLD

  20. Non-Pressure Hold System

  21. Pressure Hold System

  22. Fine Tuning an Abrasive Blast System Adjustments can be made to the following for enhanced productivity: • Abrasive metering • Minimizing pressure drop & increasing air flow • Hose length, hose size, couplings • Nozzle size • Moisture in air

  23. Achieving Efficiency in Abrasive Blasting THANK YOU Sponsored by:

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