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: Tim McCandless 303.347.6285 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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 establishes minimum requirements for rubber-seated butterfly valve assemblies, 78 in. (2,000 mm) diameter and larger with flanged ends for fresh and reclaimed water having a pH range from 6–12 and a temperature range from 33°–125°F (0.6°–52°C) and suitable for a maximum steady-state fluid working pressure of 250 psig (1724 kPa [gauge]), a maximum steady-state differential pressure of 250 psi (1724 kPa), and a maximum full open fluid velocity of 16 ft/sec (4.9 m/sec) based on nominal valve size. 1.1.1 Body classes. Valves described in this standard are provided in classes 25B, 50B, 75B, 150B, and 250B. 1.1.2 Definition of classification. In each case the numeric designation represents the pressure rating, the maximum steady-state fluid working pressure, in pounds per square inch gauge, and also the maximum steady-state differential pressure, in pounds per square inch, for which the valve is designed. The designation “B” defines the flow-rate capability of the valve in the fully open position. “B” valve assemblies are rated for a maximum velocity of 16 ft/sec (4.9 m/sec) in the piping section upstream of the valve. MAJOR REVISIONS Major revisions made to the standard in this edition include the following: 1. AWWA Pressure Class 250B was added. 2. Additional advisory information on installation was added to the Foreword. 3. Body shell thickness requirements were revised. 4. Use with reclaimed water was added. 5. Alternate purchaser specified test requirements were added.