NFPA ¡33 ¡ ¡ Standard ¡for ¡Spray ¡Applica4on ¡Using ¡ Flammable ¡or ¡Combus4ble ¡Materials ¡ Fire ¡Preven4on ¡Officers’ ¡Associa4on ¡ of ¡Bri4sh ¡Columbia ¡2013 ¡Annual ¡ Seminar ¡ Kelowna, ¡Bri4sh ¡Columbia ¡ May ¡9, ¡2013 ¡ S
NFPA 33 Scope Applies to the spray application of flammable or combustible materials by: S Compressed air atomization S Airless or hydraulic atomization S Electrostatic application S Other atomized application methods
Scope This standard also applies to the application of flammable or combustible materials applied by: S Fluidized bed application methods. S Electrostatic fluidized bed application methods. S “Other” means of fluidized application. S Automated Electrostatic Spray Equipment. S Handheld Electrostatic Spray Equipment. S Drying, Curing and Fusion Processes. S Organic Peroxides and Plural Component Coatings. S Styrene Cross-Linked Composites Manufacturing (Glass Fiber-Reinforced Plastics)
Scope Also applies to spray application of water-borne, water-based, and water-reducible materials that: S Contain flammable or combustible liquids. S Produce combustible deposits or resin.
Scope This standard does not apply to: S Spray applications performed outdoors. S Portable spraying equipment. S Aerosol products up to 1 Liter. S Application of noncombustible materials. S Address toxicity or industrial health and hygiene.
Does NFPA 33 Apply?
Definitions S Flash-Off Area- An open or enclosed area after a spray application process where vapors are released due to exposure to ambient air or a heated atmosphere. S 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 (any area in the direct path of a spray application process, the interior of a spray booth or spray room, the interiors of the exhaust plenum, eliminator/scrubber section, exhaust duct or stack).
Definitions S Fluidized Bed- A chamber holding powder coating material that is aerated from below to form an air-supported, expanded cloud of the powder. S Electrostatic Fluidized Bed- Similar to above but the powder is electrically charged with a charge opposite to that of the object being coated. S Nonincendive- Electrical equipment and associated wiring that are incapable, under normal operating conditions, of releasing sufficient electrical or thermal energy to cause ignition of specific hazardous materials in their most easily ignited concentrations in air.
Definitions S Overspray- Any sprayed material that is not deposited on the intended object. S Spray Booth- A power-ventilated enclosure for a spray application operation or process that confines and limits the escape of the material being sprayed, including vapors, mists, dusts and residues and conducts or directs these materials to an exhaust system. The booths can be of the Dry, or Water-Wash type.
Definitions S Spray Room- A power ventilated fully enclosed room used exclusively for open spraying of flammable or combustible materials. S Ventilation- Movement of air that is provided for the prevention of fire and explosion and is sufficient to prevent accumulation of vapor-air mixtures in concentrations over 25% of the lower flammable limit.
Location S Spray application operations and processes shall be confined to spray booths, spray rooms, or spray areas. S Spray application operations and processes shall not be conducted in any A, E, I or R occupancy unless they are located in a room that is separated by 2 hour fire rated construction and protected by an approved automatic fire sprinkler system.
Design and Construction S Walls and ceilings shall be constructed of noncombustible or limited combustible materials with interior surfaces smooth (cannot trap residue or restrict ventilation or cleaning). S Aluminum shall not be used unless it is limited to ancillary devices.
Design and Construction Spray Rooms shall be constructed of S and separated from surrounding areas of the building by 1 hour fire rated construction. Enclosed spray booths/rooms shall be S provided with means of egress that meet the requirements of NFPA 101. Conveyor openings that are necessary S for transporting or moving work into and out of the spray area shall be as small as practical.
Design and Construction S Spray booths shall be separated from other operations by a minimum distance of 915mm or by a partition, wall, or floor/ceiling assembly with a minimum 1 hour fire resistance rating. S All parts must be readily accessible for cleaning. S A clear space of not less than 915mm shall be maintained on all sides and above (Exceptions for walls).
Design and Construction S Panels for light fixtures or observation shall be of heat-treated glass, laminated glass, wired glass, or hammered wired glass and shall be sealed to confine vapors, mists, residues, dusts and deposits to the spray area. S Panels for the light fixtures shall be separated from the fixture to prevent the surface temperature of the panel from exceeding 93°c
Design and Construction Spray areas that are equipped with ventilation distribution or baffle plates or with dry overspray collection filters shall: Have distribution plates or baffles constructed of noncombustible materials S and be readily accessible for cleaning. Not use filters when applying materials known to be highly susceptible to S spontaneous heating/ignition. Have filter supports constructed of noncombustible materials. S Have filters readily accessible for cleaning or replacement. S Not allow filters to be alternately used for different types of coating materials. S
Electrical Area Classification (Abbreviated) Class I- Any location where flammable gas or vapor is present or might be present in the air in quantities sufficient to produce an explosive or ignitible mixture. S Class I, Division 1- Above condition exists in normal operating conditions. Condition can exist frequently due to repair or maintenance operations, or leakage. Breakdown or faulty operation of equipment can release ignitible concentration with potential simultaneous failure of electrical equipment in such a way that it becomes a source of ignition.
Electrical Area Classification (Abbreviated) S Class I, Division 2- Similar conditions to previous slide but the flammable gas, vapor or liquid is confined within a closed container or system and only escapes in cases of accidental rupture or breakdown of the container/system or abnormal operation of equipment. Ignitible concentration is prevented by positive mechanical ventilation (unless failure). An ignitible concentration may be transmitted from a CI, D1 location if failure of positive mechanical ventilation.
Electrical Area Classification (Abbreviated) Class I, Zone 0- Location where an ignitible concentration of flammable gas or vapor is continuously present Class I, Zone 1- Location where one of the following conditions exist. S Ignitible concentration of flammable gas or vapor exists under normal conditions, during repair/maintenance. Breakdown may cause ignitible concentration and simultaneous failure of electrical system that could be an ignition source. Ignitible concentration may be transmitted from a CI, Z1 location.
Electrical Area Classification (Abbreviated) Class I, Zone 2- Location where one of the conditions exist S Ignitible concentration of flammable gas or vapor is not likely to exist under normal operating conditions, or exists for only a short period of time. Flammable gas or volatile flammable liquid is present but is confined within a closed container. Ignitible concentration is prevented by positive mechanical ventilation. Ignitible concentration may be transmitted from a CI, Z1 location.
Electrical Area Classifications (Abbreviated) Class II- Locations similar to Class I but containing combustible dust. (Also includes dust interfering with dissipation of heat.) Zone 20- Locations where an ignitible concentration of combustible dust is present continuously or for long periods of time. Zone 21- Similar to Class I, Zone 1 locations but refers to dust. Zone 22- Similar to Class I, Zone 2 locations but refers to dust.
Electrical Devices S Spray area shall be Class I, Division 1; Class I, Zone 1; Class II, Division 1; or Zone 21 (whichever is applicable). S Electrical equipment and wiring located in the spray area (and not subject to combustible residues) shall conform to above classifications (whichever is applicable).
Electrical Devices Equipment and wiring located outside but within 6100mm horizontally and 3050mm vertically of an unenclosed spray area shall be designated as shown in Figure 6.5.1
Electrical Devices If spray application operations are conducted within a closed-top, open-face or open-front booth, or room, any electrical wiring or equipment located outside the booth/room but within 915mm of any opening shall be designated as shown in Figure 6.5.2
Electrical Devices If spray application operations are confined to an enclosed spray booth or room, the electrical area classification shall be as shown in Figure 6.5.4
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