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All surge tanks, receiving reservoirs, gravity storage tanks, house storage tanks, or tanks of any description used for receiving or storing city water at atmospheric pressure, shall be supplied an approved slow-acting automatic control valve. The discharge outlet of the control valve shall be directly connected to the receiving unit at a distance of 6 inches (150 mm) above the top of a horizontal overflow pipe. For a vertical overflow pipe, the distance shall be 6 inches (150 mm) plus the diameter of the overflow pipe. The overflow pipe connection shall have an area of not less than twice that of the supply opening.
Each tank used for receiving or storing city water shall be provided with a sludge drain pipe which shall be connected to the tank at the lowest level of the bottom section thereof and shall discharge through an indirect connection to the drainage system with a minimum air gap of 6 inches (150 mm).
Such tanks shall have bolted watertight covers of the same material as the tank and shall be located and housed to prevent external pollution. The Commissioner of Buildings shall approve the support for all such tanks before the permit is issued.
(Amend Coun. J. 3-5-03, p. 104990, § 48; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1; Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 25)
All new or newly remodeled commercial and industrial vehicle wash installations shall be equipped with a water recycling system to conserve water. The system shall be composed of a water reuse tank and all necessary piping to insure the cycling of water for more than one washing operation.
Potable water inlets to gravity tanks shall be controlled by a ball cock or other automatic supply valve to prevent the tank from overflowing. The inlet shall be terminated as to provide an air gap not less than 4 inches (100 mm) above the overflow.
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