ORD 1024 - Laserfiche WebLink

Ordinance No. 1024 Title [[ AN O~DINANC£ OF TH[ of Article ! of Title ~1 of the Code eby repealed. 2.3 AUXILIARY WATER SUP. distributing pipes of a potable water supply system from any source other than its intended source caused by the sudden reduction of pressure in the pot- able water supply system. 2.6 BACKFLOW PREVEN- TER. A device or means de signed to prevent backflow or back-siphonage. 2.6.1 Air-Gap, The unob. structed vertical distance through the free atmosphere between the lowest opening from any p~pe or faucet supply- mg water to a tank, plumbing fixture, or other device and the flood level rim of said vessel. An approved air-gap shall be at least double the diameter of the supply pipe, measured vertical- ly, above the top of the rim of the vessel; and, in no case less than one inch, When an air-gap is used at the service connec- tion to prevent the contamina- tion or pollution of the public potable water system, an emer- gency by-pass shall be installed around the air-gap system and an approved reduced pressure principle device shall be m- staUed in the by-pass system. 26.2 Reduced Pressure Principle Device. An assembly of two independently operating approved check valves with an automatically operating differ- ential relief valve between the two check valves, tightly closing shut-off valves on either side of the check valves, plus property located test cocks for the test lng of the check and relief valves. The entire assembly shall meet the design and per- formance specifications and approval of a recognized and City approved testing agency for backbow prevention assam- bbes. The device shall operate to maintain the pressure in the zone between the two check valves at a level less than the pressure on the public water supply side of the device. At ces- sation of the normal flow the pressure between the two check valves shall be less than the pressure on the public water supply side of the device. In case of leakage of either of the check valves the differential re- lief valve shall operate to main. fain the reduced pressure in the zone between the check valves by discharging to the atmos- phere. When the inlet pressure is two pounds per square inch or less, the relief valve shall open to the atmosphere To be ap- proved, these devices must bo readily accessible for in-line maintenance and testing and be installed in a location where no part of the device will be sub- merged. 2.6,3 Double Check Valve Assembly. An assembly of two indepenoentiy operating ap- proved check valves with tightly closing shut-off valves on each side of the check valves, plus properly located test cocks for the testing of each check valve, The entire assembly shall meet the design and performance specifications and approval of a recognized and City approved testing agency for backflow prevention devices. To be ap- proved, these devices must be readily accessible for in-line maintenance and testing. 27 CONTAMINATION. Means an impairment of the quality of the potable water by sewage, industrial fluids or waste liquids, compounds or other materials to a degree which creates an actual hazard to the public health through poi soning or through the spread of disease, 2,8 CROSS.CONNECTION Any physical connection or ar rangement of piping or fixtures between two otherwise separate piping systems one of which contains potable water and the other non-potable water or in- dustrial fluids of questionable safety, through which, or bo- cause of which, backflow or back-siphonage may occur into the potable water system, A wa- tar service connection between a public potable water distribu. tion system and a customer's water distribution system which is cross-connected to a contam- inated fixture, industrial fluid system or with a potentially con- taminated supply or auxiliary water system, constitutes one type of cross.connection. Other types of cross.connections in. clude connectors such as swing connections, removable sec- tions, four-way plug valves, spools, dummy sections of pipe, swivel or change-over devices, sliding multiport tube, solid connections, etc. 2.9 CROSS-CONNECTIONS - CONTROLLED. A connection between a potable water system and a non-potable water system with an approved beckfiow pre- vention device properly in- ford the protection commensur. ate with the degree of hazard. 2.1o CROSS-CONNECTION The installation of an approved the service Fine leading to and