AWWA Standard C510-97 (Revision of C510-92): Standard for Double Check Valve Backflow Prevention Assembly
This standard covers the double check valve backflow prevention assembly. The assembly shall be for operation on hot or cold water lines and capable of withstanding a working water pressure of at least 150 psi (1,034 kPa) without damage to working parts or impairment of function. This standard covers hot and cold water double check valve backflow prevention assemblies. All assemblies shall be designed to operate at a minimum temperature range of 33 degrees F to 140 degrees F (1 degree C to 60 degrees C). Hot water assemblies shall be designed to, at a minimum, operate in water at a temperature range of 33 degrees F to 180 degrees F (1 degree C to 82 degrees C). A complete assembly consists of two internally loaded, independently operating check valves, located between two tightly closing resilient-seated shutoff valves, with four properly placed resilient-seated test cocks. The major revisions in this edition of ANSI/AWWA C510-97 include the following: the format has been changed to AWWA standard style; definitions for cosmetic and structural defects have been added (Sec.3); the operating temperature range for cold-water double check valve backflow prevention assemblies has been increased (Sec. 1.1); Table 1, Parameters for Double Check Valve Backflow Prevention Assembly, has been expanded to include sizes 1/4 in. (6 mm), 3/8 in. (9 mm), 1/2 in. (12 mm), and 12 in. (305 mm); the section on connections has been expanded to include grooved and shouldered joints (Sec. 22.214.171.124); the section on test cocks has been expanded to include requirements on test connections (Sec. 126.96.36.199); a new section on operation at rated temperature and pressure has been added (Sec. 188.8.131.52); Table 2, Thermal Test Minimum Flow Rates has been added; and, a new section on casting requirements has been added (Sec. 4.4.4).