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

2021 NFPA 33 Standard - Current Edition
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  • Description

    Help protect people in facilities where flammable or combustible liquids are sprayed with the 2021 edition of NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials.

    Help engineers, employees, and individuals stay safe by addressing fire, explosion, and electrical hazards in industries that spray flammable and combustible liquids, including waterborne materials that contain flammable or combustible residues. In the new edition of NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, requirements for sprinkler systems and spray booths were expanded. New language was added to the fire safety standard to explain why only clear, cellulose-based bags should be used to cover sprinklers. The technical standard now specifies that the recirculation of heated air does not apply to spray booths used for curing and clarifies that automatic fire protection is not necessary in small spray booths.

    Important updates in this fire safety standard improve consistency and clarify requirements, making this version of NFPA 33 vital for engineers, designers, contractors, and installers.

    • The Origin and Development was revised to provide users with a more concise summary of the standard's historical changes.
    • New terms were added to Chapter 3 for liquid classifications.
    • To better align with applicable sections in NFPA 70®, National Electrical Code® (NEC®), additional direction was added to the Chapter 6 annex material.
    • To provide ease and clarity for the user, Chapter 9, Heaters, was reorganized for a clearer and more cohesive reading experience.
    • Extracted material from other NFPA® documents was updated to provide the most current safety requirements.
    • Language was updated to align with the current edition of NFPA 30, Flammable and Combustible Liquids Code.

    NFPA 33 has essential rules for the construction of spray rooms, spray booths, and spray areas, including their electrical installations, ventilation, and fire protection systems. The standard also contains requirements for safe spray application of coatings, including handling of flammable liquids, operations, and maintenance.

    Enhance fire and electrical safety in your workplace by learning about the dangers related to the spray application of flammable materials or combustible materials. Follow the industry’s best practices with the newest edition of NFPA 33. (Print, 68 pp., 2021)

    Order the latest edition of NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, today.

  • Table of Contents (2021 Current Edition)

    NFPA® 33 Standard for Spray Application Using Flammable or Combustible Materials, 2021 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. (Reserved)
    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 General Requirements
    4.1 Location of Spray Application Operations.
    4.2 Separation.
    4.3 Basements.
    4.4 Fueled Vehicles.
    4.5 Noncombustible Material.
    4.6 Limited-Combustible Material.
    4.7 Classification Scheme.
    4.8 Determination of Flash Point (FP).
    Chapter 5 Construction and Design of Spray Areas, Spray Rooms, and Spray Booths
    5.1 Spray Areas.
    5.2 Spray Rooms.
    5.3 Spray Booths.
    5.4 Conveyor Openings.
    5.5 Separation from Other Operations.
    5.6 Illumination and Observation Panels.
    5.7 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 Luminaires.
    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 Heating of Recirculated Air.
    7.7 Manifolding of Exhaust Ducts.
    7.8 Materials of Construction.
    7.9 Support of Exhaust Ducts.
    7.10 Exhaust Duct Access Openings.
    7.11 Exhaust Fans and Drives.
    7.12 Drying Areas.
    Chapter 8 Storage, Handling, and Distribution of Flammable and Combustible Liquids
    8.1 General.
    8.2 Storage in Process Areas.
    8.3 Handling and Use.
    8.4 Distribution Systems — Piping.
    8.5 Distribution Systems — General.
    Chapter 9 Protection
    9.1 General.
    9.2 Ventilation Systems.
    9.3 Coating Material Delivery Systems.
    9.4 Conveyors.
    9.5 Protection Systems.
    9.6 Specific Process Protection.
    9.7 Protection for Electrostatic Precipitator Scrubber.
    9.8 Protection for High-Capacity Dry Paint Arrestor.
    Chapter 10 Operations and Maintenance
    10.1 General.
    10.2 Inspection, Testing, and Maintenance.
    10.3 Combustible Deposits.
    10.4 High-Pressure Hose Lines.
    10.5 Maintenance Procedures.
    10.6 Waste Containers.
    10.7 Clothing.
    10.8 Cleaning Operations.
    10.9 Solvent Distillation Units (Solvent Recyclers).
    10.10 Spontaneous Ignition Hazards.
    10.11 Chlorinated Solvents.
    10.12 Smoking.
    10.13 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 Liquefied-Petroleum-Gas, Compressed-Natural-Gas, or Hydrogen-Fueled Vehicles.
    13.5 Radiant Drying Apparatus.
    13.6 Flash-Off Areas.
    13.7 Spray Booths or Spray Rooms Adjacent to or Connected to Rooms or Equipment Used for Drying, Curing, or Fusing.
    13.8 Ventilation.
    13.9 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 Limitations.
    18.3 Membrane Material.
    18.4 Protection.
    18.5 Personnel Inside the Enclosure.
    18.6 Electrical and Other Sources of Ignition.
    18.7 Ventilation.
    18.8 Recordkeeping.
    18.9 Storage and Handling of Ignitible (Flammable and Combustible) Liquids.
    18.10 Facilities Compliance Permitting.
    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
  • Prior Editions

    2018 Edition

    Address fire and electrical safety concerns more effectively with the 2018 edition of 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. The 2018 edition of 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.

    Major changes improve consistency and clarify requirements, making this edition essential for engineers, designers, contractors, and installers.

    • Chapter 1, Administration clarifies document application. For example, Chapter 14 shall apply only to miscellaneous spray operations, and Chapter 18 shall apply only to spray application processes or operations that are conducted in temporary membrane enclosures both inside and outside buildings and structures.
    • Modified Chapter 3: Definitions is parallel with other NFPA® documents placing noncombustible material, limited-combustible material, and classification of liquids and determination of flash points in a General Requirements section. Changes are consistent with NFPA 1, Fire Code, NFPA 30, Flammable and Combustible Liquids Code, and NFPA 5000®, Building Construction and Safety Code®.
    • Updated Chapter 4: General Requirements is applicable to all spray operations. Changes clarify definitions and spraying location, making them consistent with Chapter 5 requirements.
    • Changes in Chapter 5: Construction and Design of Spray Areas, Spray Rooms, and Spray Booths address the confusion between spray rooms and spray booths by providing requirements for each type of spray location.
    • Revised Chapter 6: Electrical and Other Sources of Ignition clarifies movement power vehicles in spray areas. Revised figures improve consistency and clarify electrical classification requirements.
    • Updates in Chapter 7: Ventilation clarify heating of recirculated air and the manifolding of exhaust ducts.

    Protect lives in facilities where flammable or combustible liquids or combustible powders are sprayed. Follow the industry best practices with today's NFPA 33. (Print, 62 pp., 2018)

    2016 Edition

    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)

     

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