AWWA Comment Period on ANSI/AWWA C904 – Crosslinked Polyethylene (PEX) Pressure Tubing, 1/2 In. Through 3 In., for Water Service May 27, 2022 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 the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing ETS Support . 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 closes on July 11, 2022. Send comments to: Paul Olson 303.347.6178 phone 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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 crosslinked polyethylene (PEX) pressure tubing made from material having a standard PEX material designation code of PEX 1306, or higher, according to ASTM F876 and intended for use as underground potable water, reclaimed water, and wastewater service lines in nominal sizes ½ in. through 3 in. that conform to a standard dimension ratio of SDR9. Tubing may incorporate an optional polymeric outer layer. MAJOR REVISIONS Major changes made to the standard in this edition include the following: 1. Metric pipe size conversions for nominal pipe sizes have been removed as there are not equivalent metric nominal sizes for this type of piping, and to be consistent with ASTM standards such as F876. When referring to a depth or length, metric conversions are included. 2. Additional information on PEX fitting systems has been moved from Appendix A to the foreword (Sec. II.B.2), including information on 4 additional types of fitting systems (Sec. II.B.2.4 – II.B.2.7). 3. A new section on tubing ends and length has been included. (Sec. 184.108.40.206). 4. A PEX Tubing Material Designation Code for chlorine resistance has been included. (Sec. 4.3.9). 5. A PEX Tubing Material Designation Code for UV resistance has been included. (Sec. 4.3.10). 6. Requirements for the manufacturer’s quality-control program have been clarified. (Sec. 5.1.1). 7. The requirements for plant inspection by the purchaser (Sec. 5.6) have been clarified, including inspection limitations, proprietary process limitations, and safety requirements. 8. Marking requirements have been clarified (Sec. 6.1) including production code and color of tubing. 9. Appendix A on Design and Installation of PEX has been updated with primary changes related to pressure surge dissipation, freeze break resistance, chlorine resistance, and dezincification of copper alloy fittings.