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The three project workshops provided valuable input to the project team and helped improve upon the project scope and experimental approach. The innovative and structured approach utilized for the workshops allowed the critical topics to be identified and discussed in an efficient manner. The workshops enabled the project team to explore different perspectives and identify several studies and experiences brought up by the project participants. This project developed a methodology and designed the testing setup for cyclic pressure testing and fatigue evaluation of large diameter pipes. The pipe sample selected for this project was a 16-in., DR 17, PE4710 pipe containing a butt-fused joint in mid length. The pipe sample was pressurized to its pressure class (125 psi) and then cycled to 1.5 times its pressure class (188 psi) for two million times without failure. Two million pressure cycles is the equivalent number of surges applied to a pipe over 100 years of service at the rate of 50 surges per day. After completion of the two million cycle test, the same pipe sample was cycled from its pressure class (125 psi) to 2 times pressure class (250 psi) for an additional 50,000 cycles without failure. The testing protocol developed in this project can be used to evaluate other types of large diameter pipes. The case studies collected by the project team and presented in this report provide details on successful installations of large diameter HDPE pipe. Information regarding the challenges and solutions developed during the construction operations are included in these case studies. Overall, this project shows that large diameter HDPE pipe is a suitable pipe material for large diameter water transmission applications. This report provides strategies to address perception issues preventing wide use of large diameter HDPE pipe, and provides recommendations regarding HDPE pipe joining, fittings, specifications, design, installation, and maintenance. xxii ©2015 Water Research Foundation. ALL RIGHTS RESERVED.PDF Image | Large Diameter HDPE Pipe for Water Main Applications
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