NFPA 33: Standard for Spray Application Using Flammable or Combustible Materials

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2016 NFPA 33 Standard
Prior Years Prior Editions of NFPA 33

Reduce fire and explosion hazards for workers with the 2016 NFPA 33: Standard for Spray Application Using Flammable or Combustible Materials.

Protect workers by addressing fire, explosion, and electrical hazards in industries that spray flammable and combustible liquids, including waterborne materials that contain flammable or combustible residues. NFPA 33 has the latest rules for the construction of spray rooms, spray booths, and spray areas, along with their electrical installations, ventilation, and fire protection systems; and for safe spray application of coatings, including handling of flammable liquids, operations, and maintenance. NFPA 33 requirements address automated and hand-held spray application processes, as well as specific requirements for electrostatic and powder coating spray systems. The Standard also includes specific requirements for hand lay-up and spraying operations for glass fiber-reinforced plastics.

The 2016 NFPA 33 helps engineers, designers, contractors, and installers address fire and electrical safety concerns more effectively.

  • Protections for new scrubber technologies help companies protect their workers and pass safety inspections.
  • Terminology correlates with NFPA 70®: National Electrical Code® (NEC®). Other text changes impact electrical classifications for outside automatic spray operations, and additional graphics help you understand electrical classification requirements.
  • A first-time chapter on Spray Application in Membrane Enclosures provides a flexible new means for compliance. The enclosures can be used indoors and outdoors to enclose workpieces that do not fit in traditional spray booths.
  • The term "secondary filter" is now "recirculation filter" and has been clarified to define this type of filter and indicate when it is allowed.
  • Combustible dust fire protection requirements and rules for sprinklers in ducts have been clarified to help users improve fire protection.
  • Annex material provides new guidance in determining the water supply requirement for all sprinklers likely to open in a single fire incident.
  • Minimum Explosive Concentrations (MECs) for representative powder coatings have been validated with recent test data, and updated Annex C contains metallic coating MECs.

Protect lives in facilities where flammable or combustible liquids or combustible powders are sprayed. Follow the industry best practices with the 2016 edition of NFPA 33. (Softbound, 55 pp., 2016)

NFPA® 33 Standard for Spray Application Using Flammable or Combustible Materials 2016 Edition

Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Application.
1.4 Retroactivity.
1.5 Equivalency.
1.6 Units and Formulas.
1.7 Enforcement.
Chapter 2 Referenced Publications
2.1 General.
2.2 NFPA Publications.
2.3 Other Publications.
2.4 References for Extracts in Mandatory Sections.
Chapter 3 Definitions
3.1 General.
3.2 NFPA Official Definitions.
3.3 General Definitions.
Chapter 4 Location of Spray Application Operations
4.1 General.
4.2 Separation.
4.3 Basements.
Chapter 5 Construction and Design of Spray Areas, Spray Rooms, and Spray Booths
5.1 Walls and Ceilings.
5.2 Conveyor Openings.
5.3 Separation from Other Operations.
5.4 Illumination and Observation Panels.
5.5 Ventilation.
Chapter 6 Electrical and Other Sources of Ignition
6.1 Scope.
6.2 General.
6.3 Electrical Area Classification.
6.4 Electrical Devices in Spray Areas.
6.5 Electrical Devices in Areas Adjacent to or Connected to Spray Areas.
6.6 Illumination.
6.7 Static Electricity.
6.8 Flexible Power Cords.
6.9 Portable Electric Lights.
6.10 Movement of Powered Vehicles.
Chapter 7 Ventilation
7.1 General.
7.2 Performance Requirements.
7.3 Make-Up Air.
7.4 Routing of Exhaust Ducts.
7.5 Recirculation of Exhaust.
7.6 Manifolding of Exhaust Ducts.
7.7 Materials of Construction.
7.8 Support of Exhaust Ducts.
7.9 Exhaust Duct Access Openings.
7.10 Exhaust Fans and Drives.
7.11 Drying Areas.
Chapter 8 Storage, Handling, and Distribution of Flammable and Combustible Liquids
8.1 General.
8.2 Storage in Process Areas.
8.3 Mixing.
8.4 Distribution Systems - Piping.
8.5 Distribution Systems - General.
Chapter 9 Protection
9.1 General.
9.2 Continuous Spray Application Operations.
9.3 Ventilation Systems.
9.4 Automatic Sprinkler Systems.
9.5 Automatic Carbon Dioxide, Dry Chemical, and Clean Agent Systems.
9.6 Portable Fire Extinguishers.
9.7 Protection for Automated Powder Application Equipment.
9.8 Protection for Automated Liquid Electrostatic Spray Application Equipment.
9.9 Protection for Dry Particulate Scrubber.
9.10 Protection for Electrostatic Precipitator Scrubber.
9.11 Protection for High-Capacity Dry Paint Arrestor.
Chapter 10 Operations and Maintenance
10.1 General.
10.2 Combustible Deposits.
10.3 High-Pressure Hose Lines.
10.4 Maintenance Procedures.
10.5 Waste Containers.
10.6 Clothing.
10.7 Cleaning Operations.
10.8 Solvent Distillation Units (Solvent Recyclers).
10.9 Spontaneous Ignition Hazards.
10.10 Chlorinated Solvents.
10.11 Smoking.
10.12 Hot Work.
Chapter 11 Automated Electrostatic Spray Equipment
11.1 Scope.
11.2 General.
11.3 Automated Electrostatic Systems.
11.4 Incendive Equipment.
11.5 Listing and Approval of Equipment.
Chapter 12 Handheld Electrostatic Spray Equipment
12.1 Scope.
12.2 General.
12.3 Handheld Apparatus.
12.4 Electrical Components.
12.5 Grounding.
Chapter 13 Drying, Curing, and Fusion Processes
13.1 General.
13.2 Spray Booths and Spray Rooms Used for Ambient Air Drying.
13.3 Spray Booths and Spray Rooms Used for Drying at Elevated Temperatures.
13.4 Flash-Off Areas.
13.5 Spray Booths or Spray Rooms Adjacent to or Connected to Rooms or Equipment Used for Drying, Curing, or Fusing.
13.6 Ventilation.
13.7 Warning Signs.
Chapter 14 Miscellaneous Spray Operations
14.1 Vehicle Undercoating and Body Lining.
14.2 Preparation Workstations.
14.3 Limited Finishing Workstations.
Chapter 15 Powder Coating
15.1 Scope.
15.2 General.
15.3 Applicability.
15.4 Location.
15.5 Protection.
15.6 Enclosures.
15.7 Electrical and Other Sources of Ignition.
15.8 Ventilation, Dust Collection, and Explosion Protection.
15.9 Drying, Curing, and Fusing Equipment.
15.10 Operation and Maintenance.
15.11 Automated Electrostatic Powder Spraying Equipment.
15.12 Handheld Electrostatic Powder Spraying Equipment.
15.13 Electrostatic Fluid Beds.
15.14 Hot Flocking.
15.15 Fluid Bed Coating.
15.16 Powder Coating Delivery and Circulation.
15.17 Powder Unloading, Bag Dumping Stations, and Pneumatic Conveying Systems.
15.18 Screening or Sieving Operations.
15.19 Storage and Handling.
Chapter 16 Organic Peroxides and Plural Component Coatings
16.1 Scope.
16.2 General.
16.3 Prevention of Contamination.
16.4 Storage of Organic Peroxides.
16.5 Handling of Organic Peroxides.
16.6 Mixing of Organic Peroxides with Promoters.
16.7 Smoking.
16.8 Trained Personnel.
16.9 Material Safety Data Sheets.
Chapter 17 Styrene Cross-Linked Composites Manufacturing (Glass Fiber–Reinforced Plastics)
17.1 Scope.
17.2 Resin Application Equipment.
17.3 Fire Protection.
17.4 Resin Storage.
17.5 Electrical and Other Hazards.
17.6 Ventilation.
17.7 Use and Handling.
Chapter 18 Spray Application Operations in Membrane Enclosures
18.1 Scope.
18.2 General.
18.3 Location.
18.4 Membrane Enclosure Occupancy.
18.5 Operations and Maintenance within Temporary Enclosures.
18.6 Membrane Material.
18.7 Electrical and Other Sources of Ignition.
18.8 Ventilation.
18.9 Recordkeeping.
18.10 Storage and Handling of Flammable and Combustible Liquids.
18.11 Facilities Compliance Permitting.
18.12 Protection.
Chapter 19 Training
19.1 General.
Annex A Explanatory Material
Annex B Determining Lower Flammable Limits
Annex C Determining Ventilation Airflow for Powder Application Systems
Annex D Fire Record
Annex E Informational References