A. Vacuum Breaker: Water closet and urinal flushometer valves shall be equipped with a listed atmospheric vacuum breaker. The vacuum breaker shall be installed on the discharge side of the flushometer valve with the critical level at least six inches (6") (152.4 mm) or the distance according to its listing above the overflow rim of a water closet bowl or the highest part of a urinal. (Ord. 938, 6-3-1991; amd. 1998 Code)
B. Ballcock: Water closet and urinal tanks shall be equipped with a listing ballcock. The ballcock shall be installed with the critical level at least one inch (1") (25 mm) above the full opening of the overflow pipe. In cases where the ballcock has no hush tube, the bottom of the water supply inlet shall be installed one inch (1") (25 mm) above the full opening of the overflow pipe. Water closets having the flush valve seat less than one inch (1") (25 mm) above the flood level rim of the closet bowl shall have the ballcock installed in a separate and isolated compartment of the tank, or shall be provided with a sheathed ballcock, or other equivalent protection.
C. Water Closet Flushometer Tanks: Water closet flushometer tanks shall be protected against backflow by an approved backflow prevention assembly, device or method.
D. Heat Exchangers: Heat exchangers and other assemblies or methods of construction using potable water shall be of listed construction and materials. Potable water shall be separated from the fluids or gasses by a minimum of two (2) separate walls, with a positive, vented leak detection path. The sections in contact with potable water shall be of material and weights suitable for potable water as set forth in this Chapter.
E. Inlets To Tanks, Vats, Sumps, Swimming Pools: Inlets to tanks, vats, sumps, swimming pools and other receptors when protected by a listed atmospheric vacuum breaker shall have such atmospheric breaker installed on the discharge side of the last valve with the critical level not less than six inches (6") (152.4 mm) or in accordance with its listing above the flood level rim of such equipment, and all downstream piping. Water supply inlets not protected by atmospheric vacuum breakers shall be protected by an approved air gap. Where atmospheric vacuum breakers or air gaps are not installed, other backflow preventers suitable for the possible contamination or pollution may be installed in accordance with the requirements for that type of device or assembly as set forth in this Chapter.
F. Lawn Sprinkling Systems: Lawn sprinkling systems shall be equipped with listed atmospheric vacuum breakers installed on the discharge side of each of the last shutoff valves. Where atmospheric vacuum breakers cannot be installed because of piping elevation or valves, other listed backflow preventers shall be installed in accordance with their requirements as set forth in this Chapter.
G. Potable Water Outlets: Potable water outlets with hose attachments other than water heater drains and clothes washer connections shall be protected by a listed nonremovable hose bib-type backflow preventer or by a listed atmospheric vacuum breaker installed at least six inches (6") (152.4 mm) above the highest point of usage and located on the discharge side of the last valve. In climates where freezing temperatures occur, a listed self-draining frost-proof hose bib with an integral backflow preventer shall be used.
H. Water Cooled Equipment: Water cooled compressors, degreasers or any other water cooled equipment shall be protected by a listed backflow preventer installed in accordance with the requirements of this Chapter.
Note: Some water cooled equipment may produce back pressure and shall be equipped with the appropriate protection. (Ord. 938, 6-3-1991)
I. Water Inlets To Water Supplied Aspirators: Water inlets to water supplied aspirators shall be equipped with a listed atmospheric vacuum breaker mounted at least six inches (6") (152.4 mm) above the aspirator unit or equipped with a listed backflow preventer installed in accordance with its listing requirements and this Chapter. The discharge shall drain through an air gap. When using the tail piece of a fixture to receive the discharge of an aspirator, the air gap shall be located above the flood level rim of the fixture.
J. Potable Water Makeup Connections: Potable water makeup connections to steam or hot water boilers shall be provided with a listed backflow protection assembly.
K. Nonpotable Water Piping: In cases where it is impractical to correct individual cross-connections on the domestic water line, the line supplying such outlets shall be considered a nonpotable water line. No drinking or domestic water outlets shall be connected to the nonpotable water line. Whenever possible, all portions of the nonpotable water line shall be exposed and all exposed portions shall be properly identified in a manner satisfactory to the Superintendent of Public Works. Each outlet on the nonpotable water line which may be used for drinking or domestic purposes shall be posted: "Danger - Unsafe Water".
L. Potable Water Supply To Carbonators: Potable water supply to carbonators shall be protected by backflow protection as approved by the Superintendent of Public Works and installed per the requirements of this Chapter.
M. Location Of Backflow Preventers: Backflow preventers shall not be located in any area containing fumes that are toxic, poisonous or corrosive. (Ord. 938, 6-3-1991; amd. 1998 Code)