AWWA Comment Period on ANSI/AWWA C518 - Double-Disc Swing-Check Valves for Waterworks Service, 2-In. - 48-In. (50-mm - 1200-mm)
August 24, 2018

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 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 10/8/18.

Send comments to:
Emily Meek
303.347.6192 phone
303.795.7603 fax

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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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.

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).
1.1.1 Body types. Valves described in this standard are provided with wafer or threaded-lug ends for installation between ANSI Class 125 flanges or grooved ends for use with IPS pressure pipe.
1.1.2 Gray-iron pressure ratings. The minimum design working water pressure for gray-iron valves shall be 200 psig (1,380 kPa) for 2-in. through 12-in. (50-mm through 300-mm) NPS inclusive and 150 psig (1,030 kPa) for 14-in. through 48-in. (350-mm through 1,200-mm) NPS inclusive.
1.1.3 Ductile-iron pressure ratings. The minimum design working water pressure for ductile-iron valves shall be 250 psig (1,380 kPa) for 2-in. through 48-in. (50-mm through 1,200-mm) NPS inclusive.
1.1.4 Fluid velocity rating. The maximum fluid velocity shall be 16 ft/sec (4.9 m/sec).
1.1.5 Installations. Double-disc swing-check valves are designed for installation in horizontal pipelines and in vertical lines with flow in the upward direction. Valves must be installed with hinge pins in the vertical position for horizontal pipeline installations.
1.1.6 Excepted conditions. Conditions of water hammer, hydraulic pulsation, and excessive noise are beyond the scope of this standard and require special design and construction consideration.

Major changes made to the standard in this revision include the following:
1. The title of the standard was revised to Double-Disc Swing-Check Valves.
2. An advisory statement was added in the Foreword (Sec. II.C) regarding chlorine and chloramine degradation of elastomers.
3. Permeation (previously Sec. 4.1) was moved to an advisory statement in the Foreword (Sec. II.D).
4. Revised the ASTM A536 material requirements.
5. Added aluminum bronze as an optional pin material.
6. Appendix B added to include a Specification and Data Sheet for Check Valves.