| AWWA COMMENT PERIOD ON AWWA C518, Double-Disc Swing-Check Valves for Waterworks Service, 2-in. Through 48-in. (50-mm Through 1,200-mm) NPS
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AWWA COMMENT PERIOD ON AWWA C518, Double-Disc Swing-Check Valves for Waterworks Service, 2-in. Through 48-in. (50-mm Through 1,200-mm) NPS

AWWA COMMENT PERIOD ON AWWA C518, Double-Disc Swing-Check Valves for Waterworks Service, 2-in. Through 48-in. (50-mm Through 1,200-mm) NPS
May 1, 2024

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 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing ETS Support (ETSsupport@awwa.org). 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 Comment Period closes on June 17, 2024.

Send comments to:

Amanda Dail, ADail@awwa.org
303.734.3466 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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 double-disc swing-check valves, 2-in. (50-mm) through 48-in. (1,200-mm) NPS, with various body and end types for raw, potable, and reclaimed water having a pH range from 6 to 12 and a temperature range of 33–125°F (0.6–52°C).

MAJOR REVISIONS

Major revisions to the standard in this edition include:

1. Replaceable seats, mechanical seat retainers, seats located on the disc, and internally retained pins were added (III.A., No. 21, Sec. 4.3.3.6, and Sec. 4.3.5.4).

2. The definition for Hinge pin was revised (Sec. 3, No. 4).

3. The definition for Rubber seat was revised (Sec. 3, No. 11).

4. Material section for rubber-seat compounds was updated to include a maximum for parts of wax (Sec. 4.2.2.6.6).

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