This standard describes the reduced-pressure principle backflow prevention assembly for potable water applications. The assembly shall be capable of withstanding a working water pressure of at least 150 psi (1,034 kPa) without damage to working parts or impairment of function and for operation on hot- or cold-water lines. This standard describes hot- and cold-water reduced-pressure principle backflow prevention assemblies. Assemblies shall be designed to operate, at a minimum, at a temperature range of 33\u00b0F to 140\u00b0F (1\u00b0C to 60\u00b0C). Hot-water assemblies shall be designed to operate, at a minimum, in water at a temperature range of 33\u00b0F to 180\u00b0F (1\u00b0C to 82\u00b0C). A complete assembly consists of a mechanical, independently operating, hydraulically dependent relief valve located between two independently operating, internally loaded check valves that are located between two tightly closing resilient seated shutoff valves with four properly placed resilient-seated test cocks (see Sec. 4.3.1.3).<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003The production and preservation of safe potable water are the objectives of greatest priority for public water utilities and other agencies having jurisdiction. When safe water has been produced and put into the public distribution system I.B.\tHistory.\u2003The Conference of State Sanitary Engineers (CSSE) and the American Water Works Association (AWWA) appointed the Joint Committee on Backflow Preventers and Cross-Connection Control in September 1959 to carry out the recommendations of an earl <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | I.C.\tAcceptance.\u2003In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for direct <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | II.\tSpecial Issues. II.A.\tOriginal Equipment Manufacturer (OEM) Parts.\u2003Parts installed during servicing and repair shall be provided by the original equipment manufacturer (OEM) and be identical to those provided in the assembly when originally approved. In particular, resil <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | III.\tUse of This Standard.\u2003It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered. III.A.\tPurchaser Options and Alternatives.\u2003This standard includes certain options and alternatives, summarized in the following list, that the purchaser should designate when purchasing reduced-pressure principle backflow prevention assemblies described i <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | III.B.\tModification to Standard\u2003Any modification to the provisions, definitions, or terminology in this standard must be provided by the purchaser. IV.\u2003Major Revisions.\u2003Major revisions made to the standard in this revision include the following: V.\tComments.\u2003If you have any comments or questions about this standard, please call AWWA\u00a0Engineering and Technical Services at 303.794.7711, FAX at 303.795.7603; write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098; or email at standa <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | AWWA Standard SECTION 1:\u2002GENERAL Sec.\u20021.1\tScope <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Sec.\u20021.2\tPurpose Sec.\u20021.3\tApplication SECTION 2:\u2002REFERENCES <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | SECTION 3:\u2002DEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | SECTION 4:\u2002REQUIREMENTS Sec.\u20024.1\tMaterials <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Sec.\u20024.2\tGeneral Design <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Sec.\u20024.3\tDetailed Design <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 2\tPressure differential relief valve discharge rates <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Table 3\tThermal test minimum flow rates <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Sec.\u20024.4\tWorkmanship SECTION 5:\u2002VERIFICATION Sec.\u20025.1\tTesting and Uniformity <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | SECTION 6:\u2002DELIVERY* Sec.\u20026.2\tPreparation for Shipment Sec.\u20026.3\tAffidavit of Compliance <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA C511-17(R21) Reduced-Pressure Principle Backflow Prevention Assembly<\/b><\/p>\n |