| AWWA Comment Period on ANSI/AWWA C301 Standard for Prestressed Concrete Pressure Pipe, Steel-Cylinder Type
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AWWA Comment Period on ANSI/AWWA C301 Standard for Prestressed Concrete Pressure Pipe, Steel-Cylinder Type

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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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 describes the manufacture of circumferentially prestressed concrete pressure pipe in diameter sizes 16 in. (410 mm) through 144 in. (3,660 mm) manufactured with a steel cylinder and wire reinforcement. Larger sizes have been manufactured based on the concepts presented in this standard. The standard describes two types of prestressed pipe: (1) lined-cylinder pipe with a core composed of a steel cylinder lined with concrete and subsequently wire-wrapped and coated with premixed cement mortar, and (2) embedded-cylinder pipe with a core composed of a steel cylinder encased in concrete and subsequently wire wrapped and coated with premixed cement mortar. The structural design of prestressed concrete pipe for internal pressure and external load is not presented in this standard but is the subject of ANSI/AWWA C304, Design of Prestressed Concrete Cylinder Pipe. ANSI/AWWA C301 also does not include requirements for handling, delivering, laying, field testing, or disinfection of pipe. See AWWA Manual M9, Concrete Pressure Pipe, for this information, as well as certain supplementary design considerations related to thrust restraint, subaqueous installations, and installation in corrosive environments.

MAJOR REVISIONS
Major changes made to the standard in this revision include the following:
1. The minimum yield strength requirement of steel used in the manufacture of cylinders for pipe has increased from 33,000 to 36,000 psi (227 to 248 MPa) (Sec. 4.4.7.1).
2. In the requirements for steel bar reinforcement, the conformance standard for the 0.55 percent maximum carbon equivalency has changed from ASTM A706 to AWS D1.4 (Sec. 4.4.8.2).
3. In the material requirements for flat steel bars, the option of conformance to ASTM A575 grade M1020 has been removed (Sec. 4.4.7.4).
4. A requirement has been added that, if specified by the purchaser, the manufacturer shall submit test reports showing the physical properties of the rubber compound used in the manufacture of gaskets (Sec. 4.4.11.8).
5. A tolerance of +1/2 in. (+13 mm) has been added to the minimum cover requirement of mortar coating over wire (Sec. 4.5.1.5).
6. A requirement in the testing of concrete strength for the pipe core has been added that, in no case shall any cylinder tested fall below 80 percent of the required strength (Sec. 4.6.5.8).
7. For placement of prestressing wire reinforcement, the required action to be taken in case of wire breakage has changed to include verification of the required tension level (Sec. 4.6.7.1).
8. Provisions for multiple layers of prestressing wire have been added, including a requirement for a smooth and even surface to minimize bridging of the prestressing wire and criteria for mortar voids and offsets to be repaired before adding subsequent wire layers (Sec. 4.6.7.2).
9. Requirements for linings and coatings for fittings have been modified extensively (Sec. 4.7.2.4).
10. Numerous editorial improvements have been made throughout the standard.
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