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Manual Gun Cleaning Processes

Manual Gun Cleaning Processes. Manual equipment cleaning generates large quantity of wastes if not done properly. Solvent is exposed to the air and evaporates About 20% of total VOC’s (volatile organic compounds) lost from auto refinishing happens in equipment cleaning operations.

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Manual Gun Cleaning Processes

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  1. Manual Gun Cleaning Processes • Manual equipment cleaning generates large quantity of wastes if not done properly. • Solvent is exposed to the air and evaporates • About 20% of total VOC’s (volatile organic compounds) lost from auto refinishing happens in equipment cleaning operations. • Most cleaners are entirely of organic solvents. Module 10-1 (a)

  2. Manual Gun Cleaning Processes • Good cleaning is VERY important • Essential to achieving a quality finish. • Needed for high transfer efficiency. • Guns are machined to very close tolerances. • Dried paint and obstructions affect gun performance. Module 10-1 (b)

  3. Manual Gun Cleaning Processes • Manual Cleaning Process Steps: • All paint is removed from the cup. • Air hose and cup is removed, the gun is triggered to remove paint from the siphon tube. • Clean thinner is poured into the cup and reattached to the gun. • Air supply is reattached, the thinner is sprayed through the gun. Module 10-1 (c)

  4. Manual Gun Cleaning Processes • Operators finger is place over the fluid tip while spraying to backwash the gun. • Cup is removed and thinner poured out. • Gun is wiped down using a rag or paper towel. • Air cap is removed and cleaned with a cleaning brush. • Cleaning brush is also used to clean other external moving parts and behind the trigger. Module 10-1 (d)

  5. Manual Gun Cleaning Processes • A metal object is used to clean the small passageways • resulting in damage and reduced gun efficiency • Gun is reassembled and returned to the storage area. • Easy to see how 20% of VOC’s are generated during the manual cleaning process. Module 10-1 (e)

  6. Mechanical Enclosed Gun Cleaning System • Mechanical Cleaning Process Steps: • Remove all the remaining paint from the cup. • Remove air hose and pull the trigger to remove paint from the siphon tube and/or fluid passages inside the gun. • Rinse the cup with a small amount of thinner. • Put a small amount of solvent in the cup, connect air line to pressure the cup. Module 10-2 (a)

  7. Mechanical Enclosed Gun Cleaning System • Disconnect the air line from the gun, purge the gun, drain solvent into the hazardous waste storage drum. • Place the disassembled gun (with all pressure gauges removed) in the gun washer. • For siphon or pressure cup-type guns, place the siphon tube on the cleaning jet, the gun trigger is locked open using a locking plate. Module 10-2 (b)

  8. Mechanical Enclosed Gun Cleaning System • For gravity-feed guns, the gun is placed upside down with the fluid orifice on the cleaning jet. • Close the lid and turn the washer on. • Washer runs for manufacturer’s recommended amount of time (often only 1 - 3 minutes.) Gun and parts are ready to be removed and used again. • Shut the lid after using the gun washer to prevent solvent evaporation. Module 10-2 (c)

  9. Mechanical Enclosed Gun Cleaning System • VOC emissions from enclosed gun washing systems have yet to be accurately measured. • Reductions are estimated to be substantial. • To reduce air emissions further: • Use cleaning solvents low in volatile organic compounds (VOC’s). • In high volume shops, two gun wash systems can be used. Module 10-2 (d)

  10. Mechanical Enclosed Gun Cleaning System • Use the first system for initial cleaning • The second for final cleaning. • When the final cleaning solvent becomes too dirty for cleaning, switch it to use for pre-cleaning. • When the pre-cleaning solvent becomes too dirty, it should be recycled. • Advantages of mechanical gun wash systems are: • Reduced employee exposure to hazardous solvents Module 10-2 (e)

  11. Mechanical Enclosed Gun Cleaning System • A reduction in the amount of thinner necessary for cleaning by 50% or more • Save time spent gun cleaning by up to 60% over manual cleaning • Reduced VOC emissions Module 10-2 (f)

  12. Mechanical Enclosed Gun Cleaning System • Wastes from Mechanical Cleaning Systems • Paint sludge will collect in the gun washer and requires disposal. • Sludge is hazardous and should be disposed by a hazardous waste management company. • Dirty cleaning solvent can be recycled either on-site or off-site and be reused. Module 10-2 (g)

  13. Improved Manual Gun Cleaning • Spray solvent through gun into an enclosed backdrop or container to catch solvent for reuse or recycling. • Store the solvent in a closed container to let the solids settle to the bottom. • Decant (pour off) the clear solvent and save it to use it again for cleaning. Module 10-3 (a)

  14. Improved Manual Gun Cleaning • Properly store and dispose the paint waste that settles to the bottom . • If passageways are clogged, use a broom straw or a soft wood toothpick to clear them. • Don’t use metal objects to clear passageways. • damages spray orifices & reduces efficiency. Module 10-3 (b)

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