Applies to flammable and combustible finishing materials applied as a spray by compressed air, airless or hydraulic atomization, steam, electrostatic or other means, in continuous or intermittent processes, and to combustible powders applied by powder guns or fluidized beds. Outdoor spraying of buildings, tanks and similar structures and small portable sprayers not used repeatedly in one place are excluded. Spray booths (b): steel, concrete or masonry (aluminum or other noncombustible material for intermittent or low volume work), smooth interiors, noncombustible floor covering, removable noncombustible baffles. Dry filter booths keep an average face velocity of at least 100 linear feet per minute (60 for electrostatic spraying), with gauges, alarms or pressure devices to show it; discarded filters are removed to a safe location or put in water-filled metal containers and disposed of at the end of the day; filter spaces have automatic sprinklers; filters are not alternated between materials that may self-ignite. Booths over 9 square feet frontal area have a 2 1/2 inch deflector; booths are 3 feet from other operations with 3 feet of clear space around them. Ignition sources (c): no open flame or spark-producing equipment in a spraying area or within 20 feet unless partitioned; no electrical equipment where residue accumulates except rigid conduit without taps; Class I Division 1 explosion-proof equipment in the spraying area and Division 2 within 20 feet; enclosed lamps; no portable lamps during spraying; all metal parts of booths, ducts and piping grounded. Ventilation (d): per NFPA 91-1961, mechanical ventilation running during spraying and afterward until vapors clear; independent steel exhaust ducts to the outside (shared only for cabinet booths totaling 18 square feet or less with identical material); nonsparking fans with motors outside the duct; duct clearance 18 inches from combustibles (reducible with protection); discharge at least 6 feet from combustible walls; no recirculation. Liquids (e): storage per 1910.106; no more than about one day's or one shift's supply near spraying; closed containers, safety cans or piping, no open or glass containers; pumps for containers over 60 gallons; gravity containers up to 10 gallons; pressure containers ASME-built with gauge and relief valve; shutoff valves at hose connections; hose inspected and pressure tested; pump relief; bonding and grounding during transfer. Protection (f): sprinklers per 1910.159 under a separate OS&Y valve, heads kept clean, portable extinguishers. Operations (g): spray only in designated areas, clean residue daily if necessary with nonsparking tools, metal waste cans emptied at least daily or each shift, clothing in metal lockers, cleaning solvents with flashpoints not less than 100 F, "No Smoking" signs. Fixed electrostatic apparatus (h): approved equipment, clearance of at least twice the sparking distance posted by sign, conveyors, no hand-manipulated goods, fail-safe shutdown on ventilation, conveyor or ground faults, grounded guarding. Hand electrostatic guns (i): approved, grounded handle, grounding of all conductive objects, interlock with ventilation. Drying apparatus (j) per NFPA 86A with ventilation interlocks and a 3-minute purge for infrared drying in auto refinishing booths. Undercoating in garages (k) exempt under stated conditions. Powder coating (l): exhaust below the lowest explosive limit, no release outdoors, dust housekeeping, fluidized bed surfaces not over 150 F. Organic peroxides and dual component coatings (m) only in approved sprinklered booths with no smoking and nonsparking tools.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.