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2. To identify features and characteristics of HDPE pipes in municipal water applications, such as design, installation, maintenance, etc., as well as any limitations and issues. 3. To develop a protocol for fatigue (cyclic surge pressure) testing of large diameter HDPE pipe as recommended by water pipeline professionals during the initial phase of this study. 1.3 METHODOLOGY The overall project approach was divided into six main tasks as shown in Figure 1.4 and summarized in the following sections. Task 1 – Literature Search A literature search was conducted to collect available information on the durability and reliability of large diameter HDPE pipe in water applications. Task 2 – Survey of Water Utilities A survey of North American water utilities was conducted to learn experiences with large diameter HDPE pipe use. It should be noted that the research team was challenged by low number of utility responses which is an indication of low usage rate of large diameter HDPE pipe in water applications. The low usage rate of large diameter HDPE pipe may have impacted the responses submitted by water utilities. Task 3 – Project Workshops During the workshops held in conjunction with this project, main objectives, scope and proposed methodology of this research project, as well as preliminary results of literature search and case studies were presented to water professionals to seek input and feedback. The recommendations presented during the workshops were instrumental in developing a testing protocol to successfully complete this project. Task 4 –Experimental Work The experimental task was conducted to develop procedures and perform fatigue (cyclic) testing of a new 16 in. PE4710 currently available in the market. The testing protocol can be used to evaluate other large diameter pipes for fatigue resistance. Task 5 –Case Studies In this task, information was collected regarding experiences with HDPE pipe as an additional measure to complement literature search, the water utility survey, and the fatigue testing. 6 According to Ballantyne (1994), reliability is the consistency of performing the required function without degradation or failure. 5 ©2015 Water Research Foundation. ALL RIGHTS RESERVED.PDF Image | Large Diameter HDPE Pipe for Water Main Applications
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