| AWWA's Comment Period on ANSI/AWWA C504 - Rubber-Seated Butterfly Valves

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AWWA's Comment Period on ANSI/AWWA C504 - Rubber-Seated Butterfly Valves

AWWA's Comment Period on ANSI/AWWA C504 - Rubber-Seated Butterfly Valves
Nov. 11, 2022

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 30-day public comment period for AWWA and ANSI. An electronic public review copy of the attachment can be obtained for review during the comment period by emailing ETS Support. Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate.

AWWA’s Comment Period closes on Dec. 26, 2022.

Send comments to:
Jason Hrdlicka
303.347.6285 phone

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal - American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal - American Water Works Association

SCOPE
This standard establishes minimum requirements for rubber-seated butterfly valves, 3 in. (75 mm) through 72 in. (1,800 mm) in diameter, with various body and end types, for raw water, potable water, wastewater, and reclaimed water having a pH range from 6–12 and a temperature range from 33°–125°F (0.6°–52°C).

MAJOR REVISIONS 
The major revisions made to the standard in this edition include the following:
1. Update to information on large buried valves in Foreword II.B.
2. Addition of information on connecting steel and gray cast iron flanges in Foreword II.G.
3. Addition of chlorine and chloramine degradation on elastomers in Foreword II.H.
4. Addition of an advisory statement on FEA as a supplement to the stress determination methods in Foreword II.I.
5. Updates to design information for shaft sizing (Sec. 4.2.3), seats (Sec. 4.2.5), shaft seals (Sec. 4.2.7), and actuators (Sec. 4.2.8).
6. Clarification to maximum coating thickness in Sec. 4.4.7.
7. Update to installation of valves in buried applications in Appendix A.5.4.
 

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