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eLibrary > AWWA C516-21 Large-Diameter Rubber-Seated Butterfly Valves, Sizes 78 In. (2,000 mm) and Larger >

AWWA C516-21 Large-Diameter Rubber-Seated Butterfly Valves, Sizes 78 In. (2,000 mm) and Larger, 2021

Foreword [Go to Page]
I. Introduction. [Go to Page]
I.A. Background. Large-diameter butterfly valves are generally used for pipelines carrying water and gases in power generation facilities, water treatment plants, and major water supply and distribution lines. Butterfly valves are isolation and flow-contr [Go to Page]
I.B. History. The need for standardization of butterfly valves was recognized by the American Water Works Association (AWWA) with the adoption of AWWA C504 for Rubber-Seated Butterfly Valves in 1954. This companion standard was developed by the AWWA Stand [Go to Page]
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
II. Special Issues. [Go to Page]
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 [Go to Page]
II.B. Buried Valves: Valves in this standard are provided with flanged ends. In buried applications, the purchaser is advised to consider providing means to accommodate issues such as differential settlement, capability to remove the valve or actuator for [Go to Page]
II.C. Advisory Information on Product Applications. 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 appropri
II.D. Advisory Information on Scheduling Requirements. Valves made in accordance with this standard are not “production run” products. They are custom designed and manufactured for the specific application. A consequence of this circumstance is that valve [Go to Page]
II.E. Valve Discs and Piping Design. The discs of butterfly valves, when in the fully open position, intrude into the adjacent upstream and downstream piping or other adjacent devices. This can especially be an issue with adjacent pipe having interior lin
II.F. Effects of Manual or Power Actuator Stroke Time. When requiring manual and power actuators in Sec. III.A 6, 7, 8, and 9, consideration should be given to the effects of speed of valve operation on the pipeline hydraulic transients (surges), especial [Go to Page]
II.G. 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
II.H Bolting Gray Cast Iron Flanges to Steel Flanges. The following recommendations are made for the use of high strength bolting used with either ASME or AWWA steel flanges when bolting to low ductility gray cast iron valve flanges. The ASME B16.1 standa
II.I Permeation by Organic Solvents or Petroleum Products.
II.J Advisory Information on Valve Design. Modern calculation tools like FEA software can be used as a supplement to the equations listed in this standard for stress design. These calculation tools are able to show detailed stress concentrations on valve
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 application being considered. [Go to Page]
III.A. Purchaser Options and Alternatives. The following information should be provided by the purchaser.
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
AWWA Standard
SECTION 1: GENERAL
Sec. 1.1 Scope
Sec. 1.2 Purpose
Sec. 1.3 Application
SECTION 2: REFERENCES
SECTION 3: DEFINITIONS
SECTION 4: REQUIREMENTS
Sec. 4.1 Data to Be Provided by the Manufacturer
Sec. 4.2 Materials.
Sec. 4.3 General Design [Go to Page]
Table 1 Laying length* ranges for flanged valves
Sec. 4.4 Valve Actuators [Go to Page]
Table 2 Actuator application factors (AF)
Sec. 4.5 Welding and Fabrication
SECTION 5: VERIFICATION
Sec. 5.1 Shop Tests
Sec. 5.2 Proof-of-Design Tests
Sec. 5.4 Nonconformance
SECTION 6: DELIVERY
Sec. 6.1 Marking
APPENDIX A [Go to Page]
Installation, Operation, and Maintenance of Large-Diameter Butterfly Valves [Go to Page]

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