AWWA Comment Period on ANSI/AWWA C304 Standard for Design of Prestressed Concrete Cylinder Pipe

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:
Frank Kurtz
303.347.6221 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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 defines the methods to be used in the structural design of buried prestressed concrete cylinder pipe (PCCP) under internal pressure. These methods are provided for the design of pipe subjected to the effects of working, transient, and field-test load and internal pressure combinations.
The design procedures of this standard are applicable to lined-cylinder pipe (LCP) having inside diameters of 16 in. through 60 in. (410 mm through 1,520 mm) and to embedded-cylinder pipe (ECP) having inside diameters of 24 in. (610 mm) and larger.
The design for longitudinal hydrostatic thrust restraint of prestressed concrete cylinder pipe is not addressed in this standard. See AWWA Manual M9, Concrete Pressure Pipe, for information on this topic.

MAJOR REVISIONS
The major revisions made to the standard in this edition include the following:
1. In Sec. 2.3.1.1, the unit weights for concrete and mortar have been changed from 150 and 144 lb/ft3 (2,403 and 2,307 kg/m3) to 145 and 140 lb/ft3 (2,323 and 2,243 kg/m3), respectively, to match the unit weights in Sec. 5.3.4 and 5.4.3.
2. In Sec. 2.3.1.3, an alternate method for calculating surcharge load is permitted provided it is in accordance with recognized and documented analytical procedures based on soil–pipe interaction.
3. In Sec. 5.5.1, the design yield strength of the steel cylinder in tension has been changed from 33,000 psi to 36,000 psi (227 to 248 MPa).
4. Numerous editorial improvements and reference updates have been made throughout the standard.