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ARTICLE VII. DIPPING AND ROLL COATING (15-24-720 et seq.)
"Dip tank" means a tank, vat or container containing Class I, II, or III flammable liquid or a liquid containing any volatile flammable substance in solution or by suspension in which articles or materials are immersed for the purpose of coating, finishing, cleaning, treating or similar processes.
"Dip tank vapor area" means the area within a 20-foot radius of any dip tank, its drain board or associated drying, conveying or other equipment, during operation or shutdown periods, unless separated by walls conforming to Section 15-24-570 of this Code.
(Prior code § 129.1-63)
Dip tanks shall not be permitted in any institutional building. Dip tanks shall not be permitted in any school, assembly or multiple-dwelling building, except in a room designed for the purpose, protected with an approved system of automatic sprinklers and separated vertically and horizontally from other parts of the building by construction having not less than two-hour fire-resistive rating.
(Prior code § 129.1-64)
Ventilation of dip tanks vapor areas shall comply with the applicable sections of Title 14M. Such ventilation shall be adequate to prevent the vapor accumulations. Such ventilation shall also be so arranged that failure of any ventilating fan shall automatically stop any dip tanks conveying system.
(Prior code § 129.1-65; Amend Coun. J. 10-7-20, p. 21791, Art. VI, § 43)
(a) Dip tanks shall be constructed of substantial noncombustible material and their supports shall be of heavy metal, reinforced concrete or masonry.
(b) Adequate drainboards shall be provided to prevent the liquid from dripping on the floor or other undesirable locations. Such drainboards shall be constructed of substantial noncombustible material and shall have a pitch of not less than one-half-inch vertical rise for each ten feet of the horizontal so that the liquid will drain back to the dip tank or other suitable location. Such drainboards shall be arranged to automatically prevent the conducting of water into the dip tank in the event of a fire.
(c) Dip tanks of over 150 gallons in capacity or ten square feet in liquid surface area hereafter installed shall have a trapped overflow pipe leading to an underground salvage tank complying with the requirements of Section 15-24-280. The bottom of the overflow connection shall be not less than six inches below the top of the tank.
(d) Dip tanks in excess of 500 gallons in liquid capacity hereafter installed shall be equipped with an approved quick-opening valve located at the bottom of the dip tank. Such valve shall operate manually and shall also be arranged to automatically open the valve in the event of a fire and quickly drain the contents of the tank to an underground salvage tank, complying with the requirements of Section 15-24-280. Manual operation shall be from a safe, accessible location. Where gravity flow is not practicable, automatic pumps shall be provided. Such drains shall be trapped.
(e) Dip tanks utilizing a conveyor system shall be so arranged that in the event of a fire, the conveyor system shall automatically cease motion and the required bottom drains shall open.
(Prior code § 129.1-67)
Electrical wiring, motors and fixtures in any dip tank vapor area shall comply with Title 14E for hazardous locations and with the specific provisions of this section.
(a) There shall be no open flames, spark- producing devices or heated surfaces having a temperature sufficient to ignite the vapors in any dip tank vapor area.
(b) Electric wiring and equipment in any dip tank vapor area shall be explosion-proof type approved for use in such hazardous locations. Such area shall be considered as Class I, Division 1 hazardous locations as defined in Section 14E-5-500.
(c) Unless specifically approved for locations containing both deposits of ignitable residues and explosive vapors, there shall be no such electrical equipment in the vicinity of dip tanks or associated drainboards or drying operations which are subject to splashing or dipping of dip tank liquids, except wiring in rigid conduit or in threaded boxes or fittings containing no taps, splices or terminal connections and except hereinafter specifically permitted in Sections 15-24-680 to 15-24-700 relating to electrostatic apparatus.
(d) In any floor space outside of the dip tank vapor area, but within 20 feet therefrom and not separated by fire separation complying with Section 15-24-730, there shall be no open flames or spark- producing devices. Such areas shall be considered as Class I, Division 2 hazardous locations as defined in Section 14E-5-500.
(Prior code § 129.1-68; Amend Coun. J. 9-6-17, p. 55278, Art. II, § 57)
A dip tank shall be required when for any reason articles or materials are immersed in Class I, II or III flammable liquids or in a liquid containing any volatile flammable substance in solution or in suspension. All dip tank, flow coat and roll coating operations and maintenance shall comply with the following:
(a) Areas in the vicinity of the dip tanks shall be kept clear of combustible stock and shall be kept entirely free of combustible debris.
(b) Frequent inspections and tests of all dip tank facilities shall be made by a qualified employee, including covers, overflow pipe inlets and discharge pipe, bottom drains, all valves including quick opening valves, electrical wiring and equipment and grounding connections ventilating facilities and all extinguishing equipment. Any defects shall be promptly corrected.
(Prior code § 129.1-69)
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