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Spray Applications and the Fire Code

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Learn the fire protection requirements for spray booths as stated in NFPA 1, Fire Code, Chapter 43. Understand the operations, functions, and hazards of spray booths. Learn the fire protection system requirements and understand how to properly apply the fire code.

Published in: Engineering

Spray Applications and the Fire Code

  1. 1. NFPA 1:43, Spraying, Dipping, andCoatingUsing Flammable or Combustible Materials
  2. 2. • Introduction • NFPA 1:43 – Scope and Key Terms – Location, Design, and Construction – Ventilation – Storage and Handling – Fire Protection – Operations, Maintenance, and Training • Hands-On – Spray Booth/System Walkthrough
  3. 3. ▪ FFPC/NFPA 1, Fire Code ▪ NFPA 1:43, Spraying, Dipping , and Coating Using Flammable and Combustible Materials ▪ NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials
  4. 4. ✓ Compressed air atomization ✓ Airless or hydraulic atomization ✓ Electrostatic application methods ✓ Fluidized bed application methods ✓ Electrostatic fluidized bed application methods ✓ “Other” acceptable application means Spray application of flammable liquids, combustible liquids, or combustible powders by any of the following methods…
  5. 5. ✓ Water-borne ✓ Water-based ✓ Water-reducible …materials that contain flammable or combustible liquids or that produce combustible deposits or residues. Spray application of flammable liquids, combustible liquids, or combustible powders by any of the following methods…
  6. 6. Ø Spray operations using less than 1 L in any 8-hour period Ø Spray applications performed outdoors Ø Portable spraying equipment Ø Aerosol products up to 1 L not used repeatedly in same location Ø Spray application of noncombustible materials Ø The hazards of toxicity or industrial health and hygiene
  7. 7. Combustible Liquid Flash point at or above 100˚F Flammable Liquid Flash point below 100˚F
  8. 8. Combustible Dust A finely divided combustible particulate solid that presents a flash fire hazard or explosion hazard when suspended in air or the process-specific oxidizing medium over a range of concentrations
  9. 9. Spray Area Any area in which dangerous quantities of flammable or combustible vapors, mists, residues, dusts or deposits are present due to the operation of spray processes Spray Booth Power-ventilated enclosure for spray application operation or process that confines and limits escape of material being sprayed Spray Room A power ventilated full enclosed room used exclusively for open spraying of flammable or combustible materials
  10. 10. Fluidized Bed A chamber holding powder coating material that is aerated from below to form an air-supported, expanded cloud of the powder Electrostatic Fluidized Bed Powder is electrically charged with a charge opposite to that of the object being coated
  11. 11. Not permitted in... • Assembly, educational, institutional, residential Exception… • Separated by 2-hour rated construction and protected by fire sprinkler system
  12. 12. Construction Non-combustible, limited combustible materials Smooth interior surface
  13. 13. Spray Rooms Separated by 1-hour fire rated construction Means of egress per NFPA 101 Conveyor openings as small as practical
  14. 14. Spray Booths Separated from other operations by 3’, or 1-hour fire rated construction All parts readily accessible for cleaning Maintain clear space of 3’ on all sides and above Vehicles movement prohibited until spray ops cease and room is properly ventilated
  15. 15. ▪ Light Fixtures and Panels ▪ Heat treated, laminated, wired, hammered wired ▪ Sealed to confine vapors ▪ Separated from fixture (temps NTE 200˚F)
  16. 16. ▪ NFPA 70, NEC ▪ Class, Division, Zone ▪ Flammability/combustibility of atmosphere ▪ Identifies location, proximity, isolation from electrical hazards ▪ Protective measures vary based on hazard class
  17. 17. • Classes ▪ Class I – flammable gas or vapors are or may be present ▪ Class II – presence of combustibledust ▪ Divisions ▪ Division 1 – vapors are always present or likely to be ▪ Division 2 – vapors are not normally present ▪ Zones ▪ Zone 0 – ignitable atmosphere is alwayspresent ▪ Zone 1 – ignitable atmosphere is likely to be present ▪ Zone 2 – ignitable atmosphere is not normally present ▪ Zone 20 – ignitable concentration of combustible dust is always present ▪ Zone 21 – ignitable concentration of combustible dust is likelypresent ▪ Zone 22 – ignitable concentration of combustible dust is not normally present
  18. 18. • Classes ▪ Class I – flammable gas or vapors are or may be present ▪ Class II – presence of combustibledust ▪ Divisions ▪ Division 1 – vapors are always present or likely to be ▪ Division 2 – vapors are not normally present ▪ Zones ▪ Zone 0 – ignitable atmosphere is alwayspresent ▪ Zone 1 – ignitable atmosphere is likely to be present ▪ Zone 2 – ignitable atmosphere is not normally present ▪ Zone 20 – ignitable concentration of combustible dust is always present ▪ Zone 21 – ignitable concentration of combustible dust is likelypresent ▪ Zone 22 – ignitable concentration of combustible dust is not normally present
  19. 19. hazard classification for unenclosed spray areas
  20. 20. hazard classification for areas adjacent to an open-face or open-front spray booth/room
  21. 21. hazard classification areas adjacent to an enclosed spray booth/room
  22. 22. Portable Light Fixtures Not permitted unless…. “Electrical wiring and utilization equipment that is located in the spray are and is not subject to deposits of combustible residues shall be listed for such exposure and shall be suitable for Class I, Division 1; Class I, Zone 1; Class II, Division 1; or Zone 21 locations.”
  23. 23. Flexible Power Cords: ▪ Approved for extra-hard usage ▪ Equipped with grounding conductor ▪ Properly connected to terminals or conductors ▪ Supported by mechanical clamp, prevents strain and easy replacement ▪ Explosion-proof or dust-tight seals provided at junction boxes, fittings, enclosures ▪ Listed for composites of combustible residue
  24. 24. NFPA 91 Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids
  25. 25. Ventilation to be operational during spray operations Make-up air adequate to compensate for exhaust air Duct to outside of building Follow most direct route to discharge Not to penetrate fire walls Directed away from fresh air intakes Minimum 6’ from exterior wall or roof Discharge away from combustible construction Doors or panels available for inspection and maintenance
  26. 26. NFPA 30 Flammable and Combustible Liquids Code For storage, handling, mixing of flammable and combustible liquids
  27. 27. MAQ Maximum Allowable Quantity Control Area An area in which hazardous materials are allowed to be stored, used, dispensed, or handled in quantities not exceeding the MAQ
  28. 28. Mixing Rooms ▪ Shall not exceed 150 sq.ft. ▪ Contain spill of rooms contents ▪ Continuously operating mechanical ventilation system ▪ Electrical area classification same as enclosed spray booth ▪ Automatic fire protection system ▪ Portable fire extinguishers
  29. 29. Shall be protected with an approved automatic fire protection system.
  30. 30. ▪ Automatic water sprinkler system (NFPA 13) ▪ Automatic foam water sprinkler system (NFPA 16) ▪ Carbon dioxide extinguishing system (NFPA 12) ▪ Dry chemical extinguishing system (NFPA 17) ▪ Gaseous agent extinguishing system (NFPA 2001)
  31. 31. Automatic water sprinkler system design considerations… ▪ Wet, dry, pre-action, deluge ▪ Extra Hazard Group II (NFPA 13:5.4.2) ▪ Sufficient to supply all heads likely to open without depleting supply for firefighting operations
  32. 32. Extra Hazard Grp. II - “…moderate to substantial amounts of flammable or combustible liquids or occupancies where shielding of combustibles is extensive.”
  33. 33. Extra Hazard Grp. II - “…moderate to substantial amounts of flammable or combustible liquids or occupancies where shielding of combustibles is extensive.”
  34. 34. System activation sequence – Activatelocalalarm Transmit alarm signal Shut down materialdelivery system Shut down spray applicationoperations Stop all conveyors
  35. 35. ▪ Controlled by separate valve ▪ Heads protected from overspray residue ▪ Covered by cellophane or thin paper bags ▪ Coated heads to be replaced
  36. 36. NFPA 10 Standard for Portable Fire Extinguishers
  37. 37. Other requirements: For automated powder application and liquid electrostatic spray application, flame detection required.
  38. 38. Responsibility of the users General housekeeping practices Free of excess residue Replacement of filters Daily debris clean-up Contaminated clothing in metal locker
  39. 39. Training of Operators: Safety and health hazards Operational, maintenance, emergency procedures Constant awareness Safe handling, storage, use of materials Use, maintenance, storage of PPE and equipment
  40. 40. NFPA 1:43, Spraying, Dipping, andCoatingUsing Flammable or Combustible Materials

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