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"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)
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