CALIFORNIA FIRE CODE — MATRIX ADOPTION TABLE
CHAPTER 24 — FLAMMABLE FINISHES
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user.
See Chapter 1 for state agency authority and building applications.)
| Adopting Agency | BSC | BSC-
CG
| SFM | HCD | DSA | OSHPD | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC |
|---|
| T-24 | T-19* | 1 | 2 | 1/AC | AC | SS | 1 | 1R | 2 | 3 | 4 | 5 |
|---|
| Adopt Entire Chapter | | | | | | | | | | | | | | | | | | | | | | | |
| Adopt Entire Chapter as amended (amended sections listed below) | | | X | | | | | | | | | | | | | | | | | | | | |
| Adopt only those sections that are listed below | | | | | | | | | | | | | | | | | | | | | | | |
| [California Code of Regulations, Title 19, Division 1] | | | | | | | | | | | | | | | | | | | | | | | |
| Chapter / Section | | | | | | | | | | | | | | | | | | | | | | | |
| 2407.2 | | | X | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | |
* The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user's convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same.
This chapter shall apply to locations or areas where any of the following activities are conducted:
- 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 where applied by brush or roller in quantities exceeding 1 gallon (4 L).
This chapter shall not apply to spray finishing utilizing flammable or combustible liquids that do not sustain combustion, including:
- Liquids that do not have a fire point when tested in accordance with ASTM D92.
- Liquids with a flashpoint greater than 95°F (35°C) in a water-miscible solution or dispersion with a water and inert (noncombustible) solids content of more than 80 percent by weight.
Operations covered by this chapter shall be protected as required by Sections
2403.2 through
2403.4.4.
Protection against sources of ignition shall be provided in accordance with Sections
2403.2.1 through
2403.2.8.
Electrical wiring and equipment shall comply with this chapter and the California Electrical Code.
Electrical wiring and equipment in
flammable vapor areas shall be of an explosionproof type approved for use in such hazardous locations. Such areas shall be considered to be Class I, Division 1 or Class II, Division 1 hazardous locations in accordance with
the California Electrical Code.
Electrical equipment, flammable vapor areas or drying operations that are subject to splashing or dripping of liquids shall be specifically approved for locations containing deposits of readily ignitable residue and explosive vapors.
Exceptions:
- 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.
Electrical wiring and equipment located outside of, but within 3 feet (914 mm) of openings in a
spray booth or a
spray room, shall be approved for Class I, Division 2 or Class II, Division 2 hazardous locations, whichever is applicable.
Electrical equipment in flammable vapor areas located such that deposits of combustible residues could readily accumulate thereon shall be specifically approved for locations containing deposits of readily ignitable residue and explosive vapors in accordance with the California Electrical Code.
Exceptions:
- Wiring in rigid conduit.
- Boxes or fittings not containing taps, splices or terminal connections.
- Equipment allowed by Sections 2404 and 2407 and Chapter 30.
Open flames and spark-producing devices shall not be located in flammable vapor areas and shall not be located within 20 feet (6096 mm) of such areas unless separated by a permanent partition.
Exception: Drying and baking apparatus complying with Section 2404.6.1.2.
Heated surfaces having a temperature sufficient to ignite vapors shall not be located in flammable vapor areas. Space-heating appliances, steam pipes or hot surfaces in a flammable vapor area shall be located such that they are not subject to accumulation of deposits of combustible residues.
Exception: Drying apparatus complying with Section 2404.6.1.2.
Equipment or apparatus that is capable of producing sparks or particles of hot metal that would fall into a
flammable vapor area shall be totally enclosed.
Metal parts of
spray booths, exhaust ducts and piping
systems conveying Class I or II
liquids shall be electrically grounded in accordance with
the California Electrical Code. Metallic parts located in
resin application areas, including but not limited to exhaust ducts,
ventilation fans, spray application equipment, work-pieces and piping, shall be electrically grounded.
Welding, cutting and similar spark-producing operations shall not be conducted in or adjacent to flammable vapor areas or dipping or coating operations unless precautions have been taken to provide safety. Conspicuous signs with the following warning shall be posted in the vicinity of flammable vapor areas, dipping operations and paint storage rooms:
NO WELDING
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.
Containers supplying spray nozzles shall be of a closed type or provided with metal covers that are kept closed.
Containers not resting on floors shall be on
noncombustible supports or suspended by wire cables.
Containers supplying spray nozzles by gravity flow shall not exceed 10 gallons (37.9 L) in capacity.
Containers and piping to which a hose or flexible connection is attached shall be provided with a shutoff valve at the connection. Such valves shall be kept shut when hoses are not in use.
Where flammable or
combustible liquids are supplied to spray nozzles by positive displacement pumps, pump discharge lines shall be provided with an approved relief valve discharging to pump suction or a safe detached location.
Where a flammable mixture is transferred from one portable
container to another, a bond shall be provided between the two
containers. Not less than one
container shall be grounded. Piping
systems for Class I and II
liquids shall be permanently grounded.
Cleaning machines for spray guns and equipment shall not be located in areas open to the public and shall be separated from ignition sources in accordance with their listings or by a distance of 3 feet (914 mm), whichever is greater. The quantity of solvent used in a machine shall not exceed the design capacity of the machine.
Where solvents are used for cleaning spray nozzles and auxiliary equipment within
spray booths and
spray rooms, the ventilating equipment shall be operated during cleaning.
Solvents used outside of
spray booths,
spray rooms or listed and approved spray gun and equipment cleaning machines shall be restricted to Class II and III
liquids.
Flammable vapor areas, exhaust fan blades and exhaust ducts shall be kept free from the accumulation of deposits of combustible residues. Where excessive residue accumulates in such areas, spraying operations shall be discontinued until conditions are corrected.
Scrapers, spuds and other
tools used for cleaning purposes shall be constructed of nonsparking materials.
Residues removed during cleaning and debris contaminated with residue shall be immediately removed from the premises and properly disposed.
Approved metal waste cans equipped with
self-closing lids shall be provided wherever rags or waste are impregnated with finishing material. Such rags and waste shall be deposited therein immediately after being utilized. The contents of waste cans shall be properly disposed of not less than once daily and at the end of each shift.
Solvent distillation equipment used to recycle and clean dirty solvents shall comply with
Section 5705.4.
The application of flammable or
combustible liquids by means of spray apparatus in continuous or intermittent processes shall be in accordance with the requirements of Sections
2403 and
2404.2 through
2404.9.4.
Combustible floor construction in
spray rooms shall be covered by approved,
noncombustible, nonsparking material, except where combustible coverings, including but not limited to thin paper or plastic and strippable coatings, are utilized over
noncombustible materials to facilitate cleaning operations in
spray rooms.
Spray booths shall be constructed of approved
noncombustible materials. Aluminum shall not be used. Where walls or ceiling
assemblies are constructed of sheet metal,
single-skin assemblies shall be not thinner than 0.0478 inch (18 gage) (1.2 mm) and each sheet of
double-skin assemblies shall be not thinner than 0.0359 inch (20 gage) (0.9 mm). Structural sections of
spray booths are allowed to be sealed with latex-based or similar caulks and sealants.
The interior surfaces of
spray booths shall be smooth; shall be constructed so as to
permit the free passage of exhaust air from all parts of the interior, and to facilitate washing and cleaning; and shall be designed to confine residues within the booth. Aluminum shall not be used.
Combustible floor construction in
spray booths shall be covered by approved,
noncombustible, nonsparking material, except where combustible coverings, including but not limited to thin paper or plastic and strippable coatings, are utilized over non-combustible materials to facilitate cleaning operations in
spray booths.
Spray booths shall be installed so that all parts of the booth are able to be accessed for cleaning. A clear space of not less than 3 feet (914 mm) shall be maintained on all sides of the spray booth. This clear space shall be kept free of any storage or combustible construction.
Exceptions:
- 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 that 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 that the wall or roof is constructed of noncombustible material and the spray booth can be adequately maintained and cleaned.
The aggregate area of spray booths in a building shall not exceed the lesser of 10 percent of the area of any floor of a building or the basic area allowed for a Group H-2 occupancy without area increases, as set forth in the California Building Code. The area of an individual spray booth in a building shall not exceed the lesser of the aggregate size limit or 1,500 square feet (139 m2).
Exception: One individual booth not exceeding 500 square feet (46 m2).
Combustible floor construction in
spraying spaces shall be covered by approved,
noncombustible, nonsparking material, except where combustible coverings, such as thin paper or plastic and strippable coatings, are utilized over
noncombustible materials to facilitate cleaning operations in
spraying spaces.
Portable fire extinguishers complying with
Section 906 shall be provided for spraying areas in accordance with the requirements for an extra (high) hazard occupancy.
Spray booths,
spray rooms and
spraying spaces shall not be alternately utilized for different types of coating materials where the combination of materials is conducive to spontaneous ignition, unless all deposits of one material are removed from the booth, room or space and exhaust ducts prior to spraying with a different material.
Automatic sprinklers installed in
flammable vapor areas shall be protected from the accumulation of residue from spraying operations in an approved manner. Bags used as a protective covering shall be 0.003-inch-thick (0.076 mm) polyethylene or cello-phane or shall be thin paper.
Automatic sprinklers contaminated by overspray particles shall be replaced with new
automatic sprinklers.
Spray booths and
spray rooms shall not be alternately used for the purpose of drying by arrangements or methods that could cause an increase in the surface temperature of the
spray booth or
spray room except in accordance with Sections
2404.6.1.1 and
2404.6.1.2. Except as specifically provided in this section, drying or baking units utilizing a heating
system having open flames or that are capable of producing sparks shall not be installed in a
flammable vapor areas.
The spraying procedure shall use low-volume spray application.
Fixed drying apparatus shall comply with this chapter and the applicable provisions of
Chapter 30. Where recirculation
ventilation is provided in accordance with
Section 2404.7.2, the heating
system shall not be within the recirculation air path.
The spraying apparatus, drying apparatus and ventilating system for the spray booth or spray room shall be equipped with interlocks arranged to accomplish all of the following:
- Prevent operation of the spraying apparatus while drying operations are in progress.
- Where the drying apparatus is located in the spray booth or spray room, prevent operation of the drying apparatus until a timed purge of spray vapors from the spray booth or spray room is complete. This purge time shall be based on completing not fewer than four air changes of spray booth or spray room volume or for a period of not less than 3 minutes, whichever is greater.
- 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).
Where a portable infrared drying apparatus is used, electrical wiring and portable infrared drying equipment shall comply with
the California Electrical Code. Electrical equipment located within 18 inches (457 mm) of floor level shall be approved for Class I, Division 2 hazardous locations. Metallic parts of drying apparatus shall be electrically bonded and grounded. During spraying operations, portable drying apparatus and electrical connections and wiring thereto shall not be located within
spray booths,
spray rooms or other areas where spray residue would be deposited thereon.
Panels for luminaires or for observation shall be of heat-treated glass, wired glass or hammered wire glass and shall be sealed to confine vapors, mists, residues, dusts and deposits to the
flammable vapor area. Panels for luminaires shall be separated from the luminaire to prevent the surface temperature of the panel from exceeding 200°F (93°C).
Luminaires attached to the walls or ceilings of a
flammable vapor area, but outside of any classified area and separated from the
flammable vapor areas by vapor-tight glass panels, shall be suitable for use in ordinary hazard locations. Such luminaires shall be serviced from outside the
flammable vapor areas.
Luminaires that are an integral part of the walls or ceiling of a
flammable vapor area are allowed to be separated from the
flammable vapor area by glass panels that are an integral part of the luminaire. Such luminaires shall be listed for use in Class I, Division 2 or Class II, Division 2 locations, whichever is applicable, and shall be suitable for accumulations of deposits of combustible residues. Such luminaires are allowed to be serviced from inside the
flammable vapor area.
Portable electric lamps shall not be used in
flammable vapor areas during spraying operations. Portable electric lamps used during cleaning or repairing operations shall be of a type approved for hazardous locations.
Mechanical
ventilation shall be kept in operation at all times while spraying operations are being conducted and for a sufficient time thereafter to allow vapors from drying coated articles and finishing material residue to be exhausted. Spraying equipment shall be interlocked with the
ventilation of the
flammable vapor areas such that spraying operations cannot be conducted unless the
ventilation system is in operation.
Air exhausted from spraying operations shall not be recirculated.
Exceptions:
Air exhausted from spraying operations is allowed to be recirculated as makeup air for unmanned spray operations, provided that all of the following conditions exist:
- 1.1. The solid particulate has been removed.
- 1.2. The vapor concentration is less than 25 percent of the LFL.
- 1.3. Approved equipment is used to monitor the vapor concentration.
1.4. When the vapor concentration exceeds 25 percent of the LFL, both of the following shall occur:
- 1.4.1. An alarm shall sound.
- 1.4.2. Spray operations shall automatically shut down.
- 1.5. In the event of shutdown of the vapor concentration monitor, 100 percent of the air volume specified in the California 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.
The
ventilation system shall be designed, installed and maintained so that the flammable contaminants are diluted in noncontaminated air to maintain concentrations in the exhaust airflow below 25 percent of the contaminant's
lower flammable limit (LFL). In addition, the
spray booth shall be provided with mechanical
ventilation so that the average air velocity through openings is in accordance with Sections
2404.7.3.1 and
2404.7.3.2.
For spray application operations conducted in an open-face or open-front spray booth, the ventilation system shall be designed, installed and maintained so that the average air velocity into the spray booth through all openings is not less than 100 feet per minute (0.51 m/s).
Exception: For fixed or automated electrostatic spray application equipment, the average air velocity into the spray booth through all openings shall be not less than 50 feet per minute (0.25 m/s).
For spray application operations conducted in an enclosed spray booth or spray room with openings for product conveyance, the ventilation system shall be designed, installed and maintained so that the average air velocity into the spray booth through openings is not less than 100 feet per minute (0.51 m/s).
Exceptions:
- For fixed or automated electrostatic spray application equipment, the average air velocity into the spray booth through all openings shall be not less than 50 feet per minute (0.25 m/s).
- Where methods are used to reduce cross drafts that can draw vapors and overspray through openings from the spray booth or spray room, the average air velocity into the spray booth or spray room shall be that necessary to capture and confine vapors and overspray to the spray booth or spray room.
Articles being sprayed shall be positioned in a manner that does not obstruct collection of overspray.
Each spray booth and spray room shall have an independent exhaust duct system discharging to the outside.
Exceptions:
- Multiple spray booths having a combined frontal area of 18 square feet (1.67 m2) or less are allowed to have a common exhaust where 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:
- 2.1. The sprayed materials used are compatible and will not react or cause ignition of the residue in the ducts.
- 2.2. Nitrocellulose-based finishing material shall not be used.
- 2.3. A filtering system shall be provided to reduce the amount of overspray carried into the duct manifold.
- 2.4. 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.
The termination point for exhaust ducts discharging to the atmosphere shall be not less than the following distances:
- 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.
Electric motors driving exhaust fans shall not be placed inside booths or ducts. Fan rotating elements shall be nonferrous or nonsparking or the casing shall consist of, or be lined with, such material. Belts shall not enter the duct or booth unless the belt and pulley within the duct are tightly enclosed.
Air intake filters that are part of a wall or ceiling
assembly shall be listed as Class I or II in accordance with UL 900. Exhaust filters shall be required.
Supports and holders for filters shall be constructed of
noncombustible materials.
Overspray collection filters shall be readily removable and able to be accessed for cleaning or replacement.
Visible gauges, audible alarms or pressure-activated devices shall be installed to indicate or ensure that the required air velocity is maintained.
Spray booths equipped with a filter roll that is automatically advanced when the air velocity is reduced to less than 100 feet per minute (0.51 m/s) shall be arranged to shut down the spraying operation if the filter roll fails to advance automatically.
Discarded filter pads shall be immediately removed to a safe, detached location or placed in a
noncombustible container with a tight-fitting lid and disposed of properly.
Spray booths using dry filters shall not be used for spraying materials that are highly susceptible to spontaneous heating and ignition. Filters shall be changed prior to spraying materials that could react with other materials previously collected. An example of a potentially reactive combination includes lacquer when combined with varnishes, stains or primers.
Waterwash
spray booths shall be of an approved design so as to prevent excessive accumulation of deposits in ducts and residue at duct outlets. Such booths shall be arranged so that air and overspray are drawn through a continuously flowing water curtain before entering an exhaust duct to the building exterior.
Interlocks for spray application finishes shall be in accordance with Sections
2404.8.1 through
2404.8.2.
Not less than one manual
fire alarm and emergency
system shutdown station shall be provided with
ready access for operating personnel. Where
access to this station is likely to involve exposure to danger, an additional station shall be located adjacent to an
exit from the area.
The aggregate surface area to be sprayed shall not exceed 9 square feet (0.84 m2).
Spraying operations shall not be of a continuous nature.
Electrical wiring within 10 feet (3048 mm) of the floor and 20 feet (6096 mm) horizontally of the
limited spraying space shall be designed for Class I, Division 2 locations in accordance with
the California Electrical Code.
Dip tanks shall be constructed in accordance with Sections
2405.3.1 through
2405.3.4.3 and NFPA 34.
Dip tanks, including drain boards, shall be constructed of
noncombustible material and their supports shall be of heavy metal, reinforced concrete or masonry.
Dip tanks greater than 150 gallons (568 L) in capacity or 10 square feet (0.93 m
2) in
liquid surface area shall be equipped with a trapped overflow pipe leading to an approved location outside the building. The bottom of the overflow connection shall be not less than 6 inches (152 mm) below the top of the
tank.
Dip tanks greater than 500 gallons (1893 L) in liquid capacity shall be equipped with bottom drains that are arranged to automatically and manually drain the tank quickly in the event of a fire unless the viscosity of the liquid at normal atmospheric temperature makes this impractical. Access to the manual operation shall be from a safe location. Where gravity flow is not practicable, automatic pumps shall be provided. Such drains shall be trapped and discharged to a closed, vented salvage tank or to an approved outside location.
Exception: Dip tanks containing Class IIIB combustible liquids where the liquids are not heated above room temperature and the process area is protected by automatic sprinklers.
Protection against the accumulation of vapors, self-ignition and excessively high temperatures shall be provided for dipping
liquids that are heated directly or heated by the surfaces of the object being dipped.
Covers shall be constructed of
noncombustible material or be of a tin-clad type with enclosing metal applied with locked joints.
Chain or wire rope shall be utilized for cover supports or operating mechanisms.
Covers shall be kept closed when
tanks are not in use.
Areas in the vicinity of
dip tanks shall be provided with portable fire extinguishers complying with
Section 906 and suitable for flammable and
combustible liquid fires as specified for extra (high) hazard occupancies.
Control of sources of ignition shall be in accordance with
Section 2403.2.
Dip tanks utilizing a conveyor
system shall be arranged such that in the event of a fire, the conveyor
system shall automatically cease motion and the required
tank bottom drains shall open.
Tanks shall be located as far as practical from furnaces and shall not be located on or near combustible floors.
Tanks shall be provided with a
noncombustible hood and vent or other approved venting means, terminating outside of the structure to serve as a vent in case of a fire. Such vent ducts shall be treated as flues and proper clearances shall be maintained from combustible materials.
Tanks shall be equipped with a high-temperature limit switch arranged to sound an alarm when the temperature of the quenching medium reaches 50°F (10°C) below the
flash point.
Air under pressure shall not be used to fill or agitate oil in
tanks.
Flow-coating operations shall comply with the requirements for
dip tanks. The area of the sump and any areas on which paint flows shall be considered to be the area of a
dip tank.
Paint shall be supplied by a gravity
tank not exceeding 10 gallons (38 L) in capacity or by direct low-pressure pumps arranged to shut down automatically in case of a fire by means of approved heat-actuated devices.
Roll-coating operations shall comply with
Section 2405.10. In
roll-coating operations utilizing flammable or
combustible liquids, sparks from static electricity shall be prevented by electrically bonding and grounding all metallic rotating and other parts of machinery and equipment and by the installation of static collectors, or by maintaining a conductive atmosphere such as a high relative humidity.
Operations using finely ground particles of protective finishing material applied in dry powder form by a
fluidized bed, an
electrostatic fluidized bed, powder spray guns or electrostatic powder spray guns shall comply with Sections
2406.2 through
2406.7. In addition,
Section 2407 shall apply to fixed electrostatic equipment used in powder coating operations.
Powder coating operations shall be conducted in enclosed powder coating rooms, enclosed powder coating
facilities that are ventilated or ventilated
spray booths.
Automated powder application equipment shall be protected by the installation of an approved, supervised flame detection apparatus that shall react to the presence of flame within 0.5 second and shall accomplish all of the following:
- 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.
Portable fire extinguishers complying with
Section 906 shall be provided for areas used for powder coating in accordance with the requirements for an extra-hazard occupancy.
Powder coating areas shall be kept free from the accumulation of powder coating dusts, including horizontal surfaces such as ledges, beams, pipes,
hoods, booths and floors.
Surfaces shall be cleaned in such a manner so as to avoid scattering dusts to other places or creating dust clouds. Vacuum sweeping equipment shall be of a type approved for use in hazardous locations.
Drying, curing and fusion equipment shall comply with
Chapter 30.
Iron or spark-producing metals shall be prevented from being introduced into the powders being applied by magnetic separators, filter-type separators or by other approved means.
When parts are heated prior to coating, the temperature of the parts shall not exceed the ignition temperature of the powder to be used.
Precautions shall be taken to minimize the possibility of ignition by static electrical sparks through static bonding and grounding, where possible, of powder transport, application and recovery equipment.
Exhaust
ventilation shall be sufficient to maintain the atmosphere below one-half the minimum
explosive concentration for the material being applied. Nondeposited, air-suspended powders shall be removed through exhaust ducts to the powder recovery
system.
Electrostatic apparatus and devices used in connection with paint-spraying and paint-
detearing operations shall be of an approved type.
A space of not less than twice the sparking distance shall be maintained between goods being painted or deteared and electrodes, electrostatic atomizing heads or conductors. The equipment manufacturer's operating instructions shall be consulted to determine the sparking distance of the equipment involved. A sign stating the sparking distance shall be conspicuously posted near the assembly.
Exception: Portable electrostatic paint-spraying apparatus listed for use in Class I, Division 1, locations.
Electrodes and electrostatic atomizing heads shall be of approved construction, rigidly supported in permanent locations and effectively insulated from ground. Insulators shall be nonporous and noncombustible.
Exception: Portable electrostatic paint-spraying apparatus listed for use in Class I, Division 1, locations.
Booths, fencing, railings or guards shall be placed about the equipment such that either by their location or character, or both, isolation of the process is maintained from plant storage and personnel. Railings, fencing and guards shall be of conductive material, adequately grounded, and not less than 5 feet (1524 mm) from processing equipment.
Exception: Portable electrostatic paint-spraying apparatus listed for use in Class I, Division 1, locations.
Automated liquid electrostatic spray application equipment shall be protected by the installation of an approved, supervised flame detection apparatus that shall, in the event of ignition, react to the presence of flame within 0.5 second and shall accomplish all of the following:
- 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.
Insulators shall be kept clean and dry. Drip plates and screens subject to paint deposits shall be removable and taken to a safe place for cleaning. Grounds and bonding means for the paint-spraying apparatus and all associated equipment shall be periodically cleaned and maintained free of overspray.
Signs shall be posted to provide the following information:
- Designate the process zone as dangerous with respect to fire and accident.
- Identify the grounding requirements for all electrically conductive objects in the flammable vapor area, including persons.
- Restrict access to qualified personnel only.
Transformers, power packs, control apparatus and all other electrical portions of the equipment, except high-voltage grids and electrostatic atomizing heads and connections, shall be located outside of the
flammable vapor areas or shall comply with
Section 2403.2.
Electrostatic apparatus shall be equipped with automatic controls operating without time delay to disconnect the power supply to the high-voltage transformer and signal the operator under any of the following conditions:
- Stoppage of ventilating fans or failure of ventilating equipment from any cause.
- Stoppage of the conveyor carrying articles past the high-voltage grid.
- Occurrence of a ground or an imminent ground at any point of the high-voltage system.
- Reduction of clearance below that required in Section 2407.2.
Hand electrostatic equipment shall be interlocked with the
ventilation system for the spraying area so that the equipment cannot be operated unless the ventilating
system is in operation.
Spilled
organic peroxides shall be promptly removed and any residue thereof promptly eliminated. Spilled material absorbed by using a
noncombustible absorbent shall be promptly disposed of in accordance with the manufacturer's recommendation.
Materials shall not be contaminated by dusts and overspray residues resulting from the sanding or spraying of finishing materials containing
organic peroxides.
Handling of
organic peroxides shall be conducted in a manner that avoids shock and friction that produces decomposition and violent reaction hazards.
Personnel working with
organic peroxides and dual-component coatings shall be specifically trained to work with these materials.
Indoor manufacturing processes involving spray or hand application of reinforced plastics and using more than 5 gallons (19 L) of resin in a 24-hour period shall be in accordance with Sections
2409.2 through
2409.6.1.
Equipment used for spray application of resin shall be installed and used in accordance with
Section 2408 and Sections
2409.3 through
2409.6.1.
Resin application areas shall be protected by an
automatic sprinkler system. The sprinkler
system design shall be not less than that required for Ordinary Hazard, Group 2, with a minimum design area of 3,000 square feet (279 m
2). Where the materials or storage arrangements are required by other regulations to be provided with a higher level of sprinkler
system protection, the higher level of sprinkler
system protection shall be provided.
A
noncombustible, open-top
container shall be provided for disposal of excess catalyzed resin. Excess catalyzed resin shall be drained into the
container while still in the
liquid state. Enough water shall be provided in the
container to maintain a minimum 2-inch (51 mm) water layer over the contained resin.
In areas where chopper guns are used, exposed wall and floor surfaces shall be covered with paper, polyethylene film or other approved material to allow for removal of overchop. Overchop shall be allowed to cure for not less than 4 hours prior to removal.
Local
ventilation shall be provided inside of workpieces where personnel will be under or inside of the workpiece.
Floor surfacing and finishing operations exceeding 350 square feet (33 m
2) and using Class I or II
liquids shall comply with Sections
2410.2 through
2410.5.
Heating,
ventilation and air-conditioning
systems shall not be operated during resurfacing or refinishing operations or within 4 hours of the application of flammable or
combustible liquids.
Floor surfacing and finishing operations shall not be conducted while an establishment is open to the public.
The power shall be shut down to all electrical sources of ignition within the
flammable vapor area, unless those devices are classified for use in Class I, Division 1 hazardous locations.
To prevent the accumulation of flammable vapors, mechanical
ventilation at a minimum rate of 1 cubic foot per minute per square foot [0.00508 m
3/(s • m
2)] of area being finished shall be provided. Such exhaust shall be by approved temporary or portable means. Vapors shall be exhausted to the exterior of the building.
