AWWA C518 2018

$75.83

AWWA C518-18 Dual-Disc Swing-Check Valves for Waterworks Service

Published By	Publication Date	Number of Pages
AWWA	2018	36

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Category: AWWA

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Description

The purpose of this standard is to provide the minimum requirements for double-disc swing-check valves, suitable for waterworks service, 2-in. through 48-in. (50-mm through 1,200-mm) NPS, including materials and testing.

PDF Catalog

PDF Pages	PDF Title
7	Foreword I. Introduction. I.A. Background. Double-disc swing-check valves have been commonly used on pump discharge applications in the waterworks industry for more than half a century. These check valves are designed to prevent backflow by automatically closing rapidly on flow-re I.B. History. The need for standardization of double-disc swing-check valves was recognized by the American Water Works Association (AWWA) in 1992. The AWWA Gate and Check Valve Committee worked to publish the first edition of ANSI/AWWA C518 beginning in 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
8	II. Special Issues. II.A. General. Conditions under which a valve is to be operated must be evaluated carefully by the purchaser. The evaluations must include the determination of the hydraulic characteristics of the system in which the valve will be installed and the operat
9	II.B. Advisory Information on Product Application. This standard does not describe all possible applications or manufacturing technologies. The purchaser should identify special requirements and required deviations from this standard and include appropria II.C. Chlorine and Chloramine Degradation of Elastomers. The selection of materials is critical for water service and distribution piping in locations where there is a possibility that elastomers will be in contact with chlorine or chloramines. Documented
10	II.D. Permeation. The selection of materials is critical for potable water, reclaimed water service, and distribution piping in locations where there is likelihood the pipe will be exposed to significant concentrations of pollutants consisting of low-mole 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. The following information should be provided by the purchaser:
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 changes made to the standard in this revision include the following:
12	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
16	SECTION 3: DEFINITIONS
17	SECTION 4: REQUIREMENTS Sec. 4.1 Data to Be Provided by the Manufacturer Sec. 4.2 Materials
19	Sec. 4.3 General Design Table 1 End-to-end dimensions for wafer and threaded-lug valves
22	Sec. 4.4 Workmanship and Coating SECTION 5: VERIFICATION
24	SECTION 6: DELIVERY Sec. 6.1 Marking Sec. 6.2 Shipping
27	APPENDIX A
31	Specification and Data Sheet for Check Valves