ARTICLE 516
Spray Application, Dipping, and Coating Processes
FPN: Rules that are followed by a reference in brackets contain text that has been extracted from NFPA 33-
2007, Standard for Spray Application Using Flammable
and Combustible Materials, or NFPA 34-2007, Standard for Dipping and Coating Processes Using Flammable or Combustible Liquids. Only editorial changes were made to the extracted text to make it consistent with this
Code.
516.1 Scope. This article covers the regular or frequent application of flammable liquids, combustible liquids, and combustible powders by spray operations and the application of flammable liquids, or combustible liquids at temperatures above their flashpoint, by dipping, coating, or other means.
FPN: For further information regarding safeguards for these processes, such as fire protection, posting of warning signs, and maintenance, see NFPA 33-2007, Standard for Spray Application Using Flammable and Combustible Materials, and NFPA 34-2007, Standard for Dipping and Coating Processes Using Flammable or Combustible Liquids. For additional information regarding ventilation, see NFPA 91-2004, Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids.
516.2 Definitions. For the purpose of this article, the fol lowing definitions shall apply.
Spray Area. Normally, locations outside of buildings or localized operations within a larger room or space. Such are normally provided with some local vapor extraction/ventilation system. In automated operations, the area limits shall be the maximum area in the direct path of spray operations. In manual operations, the area limits shall be the maximum area of spray when aimed at
180 degrees to the application surface.
Spray Booth. An enclosure or insert within a larger room used for spray/coating/dipping applications. A spray booth may be fully enclosed or have open front or face and may include separate conveyor entrance and exit. The spray booth is provided with a dedicated ventilation exhaust but may draw supply air from the larger room or have a dedicated air supply.
Spray Room. A purposefully enclosed room built for spray/coating/dipping applications provided with dedicated ventilation supply and exhaust. Normally the room is configured to house the item to be painted,
providing reasonable access around the item/process. Depending on the size of the item being painted, such rooms may actually be the entire building or the major portion thereof.
516.3 Classification of Locations. Classification is based on dangerous quantities of flammable vapors, combustible mists, residues, dusts, or deposits.
(A) Class I, Division 1 or Class I, Zone 0 Locations. The following spaces shall be considered Class I, Division 1,
or Class I, Zone 0, as applicable:
(1) The interior of any open or closed container of a flammable liquid
(2) The interior of any dip tank or coating tank
FPN: For additional guidance and explanatory diagrams, see 4.3.5 of NFPA 33-2007, Standard for Spray Application Using Flammable or Combustible Materials, and Sections 4.2, 4.3, and 4.4 of NFPA 34-2007, Standard for Dipping and Coating Processes Using Flammable or Combustible Liquids.