AWWA C511 2017 RA2021

$76.92

AWWA C511-17(R21) Reduced-Pressure Principle Backflow Prevention Assembly

Published By	Publication Date	Number of Pages
AWWA	2017	28

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Category: AWWA

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Description

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°F to 140°F (1°C to 60°C). Hot-water assemblies shall be designed to operate, at a minimum, in water at a temperature range of 33°F to 180°F (1°C to 82°C). 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).

PDF Catalog

PDF Pages	PDF Title
7	Foreword I. Introduction. I.A. Background. The 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. History. The 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
8	I.C. Acceptance. In 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
9	II. Special Issues. II.A. Original Equipment Manufacturer (OEM) Parts. Parts 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
10	III. Use of This Standard. It 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. Purchaser Options and Alternatives. This 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
11	III.B. Modification to Standard Any modification to the provisions, definitions, or terminology in this standard must be provided by the purchaser. IV. Major Revisions. Major revisions made to the standard in this revision include the following: V. Comments. If you have any comments or questions about this standard, please call AWWA Engineering 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
13	AWWA Standard SECTION 1: GENERAL Sec. 1.1 Scope
14	Sec. 1.2 Purpose Sec. 1.3 Application SECTION 2: REFERENCES
15	SECTION 3: DEFINITIONS
16	SECTION 4: REQUIREMENTS Sec. 4.1 Materials
18	Sec. 4.2 General Design
19	Sec. 4.3 Detailed Design
22	Table 2 Pressure differential relief valve discharge rates
23	Table 3 Thermal test minimum flow rates
24	Sec. 4.4 Workmanship SECTION 5: VERIFICATION Sec. 5.1 Testing and Uniformity
25	SECTION 6: DELIVERY* Sec. 6.2 Preparation for Shipment Sec. 6.3 Affidavit of Compliance