29 CFR 1910.126 - Additional requirements for special dipping and coating operations.
(a) What additional requirements apply to hardening or tempering tanks?
(1) You must ensure that hardening or tempering tanks:
(i) Are located as far as practicable from furnaces;
(ii) Are on noncombustible flooring; and
(iii) Have noncombustible hoods and vents (or equivalent devices) for venting to the outside. For this purpose, vent ducts must be treated as flues and kept away from combustible materials, particularly roofs.
(3) When practicable, you must also provide each tank with a limit switch to shut down the conveyor supplying work to the tank.
(4) If the temperature of the liquid can exceed the alarm set point, you must equip the tank with a circulating cooling system.
(5) If the tank has a bottom drain, the bottom drain may be combined with the oil-circulating system.
(b) What additional requirements apply to flow coating? (1) You must use a direct low-pressure pumping system or a 10-gallon (38 L) or smaller gravity tank to supply the paint for flow coating. In case of fire, an approved heat-actuated device must shut down the pumping system.
(2) You must ensure that the piping is substantial and rigidly supported.
(c) What additional requirements apply to roll coating, roll spreading, or roll impregnating? When these operations use a flammable liquid that has a flashpoint below 140 °F (60 °C), you must prevent sparking of static electricity by:
(1) Bonding and grounding all metallic parts (including rotating parts) and installing static collectors; or
(2) Maintaining a conductive atmosphere (for example, one with a high relative humidity) in the vapor area.
(d) What additional requirements apply to vapor degreasing tanks? (1) You must ensure that the condenser or vapor-level thermostat keeps the vapor level at least 36 inches (91 cm) or one-half the tank width, whichever is less, below the top of the vapor degreasing tank.
(2) When you use gas as a fuel to heat the tank liquid, you must prevent solvent vapors from entering the air-fuel mixture. To do this, you must make the combustion chamber airtight (except for the flue opening).
(f) What additional requirements apply to spray cleaning tanks and spray degreasing tanks? If you spray a liquid in the air over an open-surface cleaning or degreasing tank, you must control the spraying to the extent feasible by:
(1) Enclosing the spraying operation; and
(2) Using mechanical ventilation to provide enough inward air velocity to prevent the spray from leaving the vapor area.
(g) What additional requirements apply to electrostatic paint detearing? (1) You must use only approved electrostatic equipment in paint-detearing operations. Electrodes in such equipment must be substantial, rigidly supported, permanently located, and effectively insulated from ground by nonporous, noncombustible, clean, dry insulators.
(3) You must ensure that goods being electrostatically deteared are not manually handled.
(4) Between goods being electrostatically deteared and the electrodes or conductors of the electrostatic equipment, you must maintain a minimum distance of twice the sparking distance. This minimum distance must be displayed conspicuously on a sign located near the equipment.
(i) Ventilation or the conveyors fail to operate;
(ii) A ground (or imminent ground) occurs anywhere in the high-voltage system; or
(iii) Goods being electrostatically deteared come within twice the sparking distance of the electrodes or conductors of the equipment.
(7) To protect paint-detearing operations from fire, you must have in place:
(i) Automatic sprinklers; or
(ii) An automatic fire-extinguishing system conforming to the requirements of subpart L of this part.
(8) To collect paint deposits, you must:
(i) Provide drip plates and screens; and
(ii) Clean these plates and screens in a safe location.