| AWWA Comment Period on ANSI/AWWA C560 Standard for Cast-Iron Slide Gates
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AWWA Comment Period on ANSI/AWWA C560 Standard for Cast-Iron Slide Gates

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 Comment Period is now closed. Review copies are no longer available.

Send comments to: 
Dawn Flancher
303.347.6195 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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 vertically-mounted, cast-iron slide gates with full aperture closing, designed for either seating head or unseating head, or both, in ordinary water-supply and wastewater service. The gates are primarily used to shut off or throttle water or wastewater flow through a rectangular or round orifice, end of channel, or in-channel opening.. The gates may be either conventional-closure or the flush-bottom-closure type and may open upward or downward. This standard also describes manual slide gate actuator mechanisms together with standard accessories. Power actuated mechanisms, (including electric, hydraulic, or pneumatic) are described in ANSI/AWWA C541 and ANSI/AWWA C542.

MAJOR REVISIONS
Major changes made to the standard in this revision include the following:
1. The foreword was updated to bring consistency among the four slide gate standards – Fabricated Stainless Steel, Fabricated Aluminum, Fabricated Composite, and Cast Iron.
2. Wastewater considerations were included where applicable.
3. Section 4: Requirements was extensively updated to read identical among the four slide gate standards except where materially different.
5. Tensile, compressive and critical buckling loads were readdressed and language clarified. The definitions of rated and extreme outputs for manual, electric and hydraulic/pneumatic actuators are added.
6. Maximum pressure velocity factors under defined operating conditions (modulating open/close) was added to the general design along with new language for lift nut requirements, specifically pressure on the thread contact area and the ratio of the lift nut length to the diameter of the stem.
7. Allowable leakage rate for seating and unseating head was determined the same for all materials of construction. Allowable leakage rates are reduced.
8. Design loads for stem guided components are added.
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