- The application of flammable finishes to articles or materials by means of spray apparatus.
- The application of flammable finishes by dipping or immersing articles or materials into the contents of tanks, vats or containers of flammable or combustible liquids for coating, finishing, treatment or similar processes.
- The application of flammable finishes by applying combustible powders to articles or materials utilizing powder spray guns, electrostatic powder spray guns, fluidized beds or electrostatic fluidized beds.
- Floor surfacing or finishing operations using Class I or II liquids in areas exceeding 350 square feet (32.5 m2).
- The application of flammable finishes consisting of dual-component coatings or Class I or II liquids when applied by brush or roller in quantities exceeding 1 gallon (4 L).
- This provision shall not apply to wiring in rigid conduit, threaded boxes or fittings not containing taps, splices or terminal connections.
- This provision shall not apply to electrostatic equipment allowed by Section 2407.
In resin application areas, electrical wiring and equipment that is subject to deposits of combustible residues shall be listed for such exposure and shall be installed as required for hazardous (classified) locations. Electrical wiring and equipment not subject to deposits of combustible residues shall be installed as required for ordinary hazard locations.
THE USE OF WELDING OR CUTTING
EQUIPMENT IN OR NEAR THIS AREA
IS DANGEROUS BECAUSE OF FIRE
AND EXPLOSION HAZARDS. WELDING
AND CUTTING SHALL BE DONE ONLY
UNDER THE SUPERVISION OF THE
PERSON IN CHARGE.
- Automobile undercoating spray operations and spray-on automotive lining operations conducted in areas with approved natural or mechanical ventilation shall be exempt from the provisions of Section 2404 when approved and where utilizing Class IIIA or IIIB combustible liquids.
- In buildings other than Group A, E, I or R occupancies, approved limited spraying space in accordance with Section 2404.9.
- Resin application areas used for manufacturing of reinforced plastics complying with Section 2409 shall not be required to be located in a spray room, spray booth or spraying space.
- This requirement shall not prohibit locating a spray booth closer than 3 feet (914 mm) to or directly against an interior partition, wall or floor/ceiling assembly that has a fire-resistance rating of not less than 1 hour, provided the spray booth can be adequately maintained and cleaned.
- This requirement shall not prohibit locating a spray booth closer than 3 feet (914 mm) to an exterior wall or a roof assembly, provided the wall or roof is constructed of noncombustible material and the spray booth can be adequately maintained and cleaned.
- Prevent operation of the spraying apparatus while drying operations are in progress.
- Purge spray vapors from the spray booth or spray room for a period of not less than 3 minutes before the drying apparatus is rendered operable.
- Have the ventilating system maintain a safe atmosphere within the spray booth or spray room during the drying process and automatically shut off drying apparatus in the event of a failure of the ventilating system.
- Shut off the drying apparatus automatically if the air temperature within the booth exceeds 200°F (93°C).
- Air exhausted from spraying operations is allowed to be recirculated as makeup air for unmanned spray operations, provided that:
- The solid particulate has been removed.
- The vapor concentration is less than 25 percent of the LFL.
- Approved equipment is used to monitor the vapor concentration.
- When the vapor concentration exceeds 25 percent of the LFL, the following shall occur:
- An alarm shall sound; and
- Spray operations shall automatically shut down.
- In the event of shutdown of the vapor concentration monitor, 100 percent of the air volume specified in Section 510 of the Mechanical Code is automatically exhausted.
- Air exhausted from spraying operations is allowed to be recirculated as makeup air to manned spraying operations where all of the conditions provided in Exception 1 are included in the installation and documents have been prepared to show that the installation does not pose a life safety hazard to personnel inside the spray booth, spraying space or spray room.
- Multiple spray booths having a combined frontal area of 18 square feet (1.67 m2) or less are allowed to have a common exhaust when identical spray finishing material is used in each booth. If more than one fan serves one booth, fans shall be interconnected such that all fans will operate simultaneously.
- Where treatment of exhaust is necessary for air pollution control or for energy conservation, ducts shall be allowed to be manifolded if all of the following conditions are met:
- The sprayed materials used are compatible and will not react or cause ignition of the residue in the ducts.
- Nitrocellulose-based finishing material shall not be used.
- A filtering system shall be provided to reduce the amount of overspray carried into the duct manifold.
- Automatic sprinkler protection shall be provided at the junction of each booth exhaust with the manifold, in addition to the protection required by this chapter.
- Ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from the lot line; 10 feet (3048 mm) from openings into the building; 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls or openings into the building that are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.
- Other product-conveying outlets: 10 feet (3048 mm) from the lot line; 3 feet (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from openings into the building; 10 feet (3048 mm) above adjoining grade.
- Dip tanks less than 150 gallons (568 L) in capacity or 10 square feet (0.93 m2) in liquid surface area.
- Dip tanks containing a liquid with a flash point below 110°F (43°C) used in such manner that the liquid temperature could equal or be greater than its flash point from artificial or natural causes, and having both a capacity of more than 10 gallons (37.9 L) and a liquid surface area of more than 4 square feet (0.37 m2).
- Shutting down of energy supplies (electrical and compressed air) to conveyor, ventilation, application, transfer and powder collection equipment.
- Closing of segregation dampers in associated ductwork to interrupt airflow from application equipment to powder collectors.
- Activation of an alarm that is audible throughout the powder coating room or booth.
- Activation of a local alarm in the vicinity of the spraying operation and activation of the building alarm system, if such a system is provided.
- Shutting down of the coating material delivery system.
- Termination of all spray application operations.
- Stopping of conveyors into and out of the flammable vapor areas.
- Disconnection of power to the high-voltage elements in the flammable vapor areas and disconnection of power to the system.