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

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2011 NFPA 33

Prior Years Prior Editions of NFPA 33

Reduce fire and explosion hazards for workers with the 2011 NFPA 33: Standard for Spray Application Using Flammable or Combustible Materials.

Boost fire safety on the job with the latest rules for the construction of spray rooms and spray booths, along with their electrical systems, ventilation, and fire protection systems, and for safe spray application of coatings, including handling of flammable liquids, operations, and maintenance. The 2011 edition of NFPA 33 provides requirements for automated and hand-held spray application processes, as well as specific requirements for electrostatic spray systems. NFPA 33 also includes specific requirements for hand lay-up and spraying operations for glass fiber-reinforced plastics.

Revisions in the 2011 edition that improve fire prevention and fire protection include:

  • Addition of exemptions for small quantity operations
  • Inclusion of a decision tree to assist in determining applicability of NFPA 33
  • Revision of the definition of spray area to better describe its extent
  • An improved correlation with the NEC® zone system for classifying hazardous locations
  • A reduction in the extent of hazardous (classified) areas outside spray booths and rooms, based on incident history and risk analysis
  • Incorporation of NFPA 30's concept of maximum allowable quantity (MAQ) and storage quantity limits based on these MAQs
  • Changes to requirements for spray booths and rooms that are also used for drying and curing operations

Don't take chances with flammable or combustible liquids or combustible powders. Put industry best practices to work for you with the 2011 NFPA 33. (Softbound, 44 pp., 2011)

NFPA® 33 Standard for Spray Application Using Flammable or Combustible Materials 2011 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 Locations in Other Occupancies
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 Movement of Powered Vehicles
5.5 Vision and Observation Panels
5.6 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 Light Fixtures
6.7 Static Electricity
6.8 Flexible Power Cords
6.9 Portable Electric Lights
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
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 Fluidized Beds
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 Training
18.1 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