| AWWA Comment Period on ANSI/AWWA C508, Swing-Check Valves for Waterworks Service, 2 In. - 48 In. (50-mm Through 1200-mm) NPS
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AWWA Comment Period on ANSI/AWWA C508, Swing-Check Valves for Waterworks Service, 2 In. - 48 In. (50-mm Through 1200-mm) NPS

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 AWWA’s 30-day public comment period. An electronic public review copy of the proposed standard can be purchased for review during the comment period for $20 each. 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 Public Comment Period closed on November 20, 2016. The review copy is no longer available.

Send comments to:

Stephanie Passarelli

303.347.6245 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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.

Scope

This standard describes only iron-body, unassisted swing-check valves, 2-in. through 48-in. (50-mm through 1200-mm) NPS, with mechanical-joint or flanged ends that are installed in approximately level settings in water systems. The manufacturer should be consulted for special conditions. Check valve sizes described in this standard are 2, 2½, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24, 30, 36, 42, and 48-inch (50, 65, 75, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 750, 900, 1050, and 1200 mm) NPS. Sizes refer to the nominal diameter of the waterway through the inlet and outlet connections and the seat.

1.1.1 Seating types. Check valves may be of the metal-to-metal, resilient-to-metal, or resilient-to-coated seat construction as illustrated in Figure 1.

1.1.2 Hinge arm types. Check valves may incorporate either a metal or resilient hinge arm as illustrated in Figure 1.

1.1.3 Waterway types. Swing-check valves may be of the clear waterway design (where the disc in the full open position swings clear of the waterway) or the full waterway design (where the disc in the full open position is not clear of the waterway, but the body is enlarged to provide full waterway area around the disc).

1.1.4 Pressure ratings. The working water pressure shall be a minimum of 200 psig (1,370 kPa) for check valves with diameters of 2-in. through 12-in. (50-mm through 300-mm) NPS inclusive. The working water pressure shall be a minimum of 150 psig (1,030 kPa) for check valves 14-in. through 48-in. (350-mm through 1200-mm) NPS inclusive. The working water temperature shall not exceed 125°F (52°C).

1.1.5 Conditions not described. The following design and installation conditions are not described in this standard.

1.1.5.1 Chemical. Swing-check valves for use in lines conveying water of unusual corrosivity are not described in this standard where the media being conveyed has a pH less than 6.

1.1.5.2 Hydraulic. Conditions of water hammer, hydraulic pulsation, and excessive operating noise are beyond the scope of this standard and require special design and construction consideration.

Major Revisions

Major revisions made to the standard in this edition include the following:

1.    The size range was increased to 48 in. (1200-mm).

2.    New interior coating requirements were added.

3.    Revised laying length designations to “Type A” and “Type B”.

4.    Added copper alloys to acceptable material requirements.

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