This standard establishes minimum requirements for rubber-seated butterfly valve assemblies that are 78 in. (2,000 mm) and larger in diameter with flanged ends suitable for fresh and reclaimed water having a pH range from 6 to 12 and a temperature range from 33 to 125\u00b0F (0.6 to 52\u00b0C), and suitable for a maximum steady-state fluid working pressure of 250 psig (1,724 kPa [gauge]), a maximum steady-state differential pressure of 250 psi (1,724 kPa), and a maximum full-open fluid velocity of 16 ft\/s (4.9 m\/s) based on nominal valve size in classes as defined in Sec. 1.1.1 and Sec. 1.1.2.<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003Large-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 I.B.\tHistory.\u2003The 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 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.\tGeneral.\u2003Conditions 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 II.B.\tBuried Valves:\u2003Valves 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 <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | II.C.\tAdvisory Information on Product Applications.\u2003This 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 <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | II.D.\tAdvisory Information on Scheduling Requirements.\u2003Valves made in accordance with this standard are not \u201cproduction run\u201d products. They are custom designed and manufactured for the specific application. A consequence of this circumstance is that valve <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | II.E.\tValve Discs and Piping Design.\u2003The 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 <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | II.F.\tEffects of Manual or Power Actuator Stroke Time.\u2003When requiring manual and power actuators in Sec.\u00a0III.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 II.G.\tChlorine and Chloramine Degradation of Elastomers.\u2003The 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\tBolting Gray Cast Iron Flanges to Steel Flanges.\u2003The 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 <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | II.I\tPermeation by Organic Solvents or Petroleum Products. II.J\tAdvisory Information on Valve Design.\u2003Modern 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 <\/td>\n<\/tr>\n | ||||||
| 15<\/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 application being considered. III.A.\tPurchaser Options and Alternatives.\u2003The following information should be provided by the purchaser. <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | V.\tComments.\u2003If 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 <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | AWWA Standard SECTION 1:\u2002GENERAL Sec.\u20021.1\tScope <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Sec.\u20021.2\tPurpose Sec.\u20021.3\tApplication SECTION 2:\u2002REFERENCES <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | SECTION 3:\u2002DEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | SECTION 4:\u2002REQUIREMENTS Sec.\u20024.1\tData to Be Provided by the Manufacturer <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Sec.\u20024.2\tMaterials. <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Sec.\u20024.3\tGeneral Design Table 1\tLaying length* ranges for flanged valves <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Sec.\u20024.4\tValve Actuators <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Table 2\tActuator application factors (AF) <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Sec.\u20024.5\tWelding and Fabrication <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | SECTION 5:\u2002VERIFICATION Sec.\u20025.1\tShop Tests <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Sec.\u20025.2\tProof-of-Design Tests <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Sec.\u20025.4\tNonconformance SECTION 6:\u2002DELIVERY Sec.\u20026.1\tMarking <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | APPENDIX A Installation, Operation, and Maintenance \nof Large-Diameter Butterfly Valves <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA C516-21 Large-Diameter Rubber-Seated Butterfly Valves, Sizes 78 In. (2,000 mm) and Larger<\/b><\/p>\n |