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3.4 Survey Results ............................................................................................................ 24 3.4.1 Contact Information ..................................................................................... 24 3.4.2 HDPE Footage ............................................................................................. 24 3.4.3 Population Distribution................................................................................ 24 3.4.4 HDPE Pipe Age Distribution ....................................................................... 25 3.4.5 HDPE Pipes Diameter Distribution ............................................................. 26 3.4.6 Type of Permitted HDPE Pipe..................................................................... 27 3.4.7 Restriction in Use of HDPE Pipes ............................................................... 28 3.4.8 Pipe Installation Methods ............................................................................ 28 3.4.9 Leakage ........................................................................................................ 28 3.4.10 Causes/Modes of Rupture/Leakage for PE4710 ........................................ 29 3.4.11 Causes/Modes of Rupture/Leakage for PE3608/3408............................... 29 3.4.12 Concerns and Issues of Using HDPE Pipes............................................... 35 3.4.13 Life Cycle Cost .......................................................................................... 36 3.4.14 Rating the Durability and Reliability of HDPE Pipes ............................... 37 3.4.15 Comments and Suggestions ....................................................................... 38 3.5 Chapter Summary ....................................................................................................... 39 CHAPTER 4: PROJECT WORKSHOPS..................................................................................... 41 4.1 Introduction................................................................................................................. 41 4.2 Workshops Objectives ................................................................................................ 41 4.3 Methodology ............................................................................................................... 41 4.3.1 Workshops Agenda...................................................................................... 41 4.3.2 Attendees...................................................................................................... 42 4.4 Findings and Results ................................................................................................... 43 4.4.1 Discussion of What Constitutes Large Diameter HDPE Pipe ..................... 44 4.4.2 Identification of Critical Issues.................................................................... 44 4.4.3 Discussion on Survey Form & Results ........................................................ 46 4.4.4 Discussion on Testing .................................................................................. 47 4.4.5 Discussion on Case Studies ......................................................................... 48 4.4.6 Discussion of High Priority Topics.............................................................. 49 4.5 Chapter Summary ....................................................................................................... 56 CHAPTER 5: EXPERIMENTAL WORK ................................................................................... 59 5.1 Introduction................................................................................................................. 59 5.2 Objectives ................................................................................................................... 60 5.3 Approach..................................................................................................................... 60 5.4 Pipe Samples............................................................................................................... 60 5.5 Experiment Setup........................................................................................................ 61 5.6 Testing Operation........................................................................................................ 61 5.7 Test Results – Phase 1................................................................................................. 63 5.7.1 Project Issues ............................................................................................... 63 5.7.2 Test Results.................................................................................................. 63 5.8 Test Results – Phase 2................................................................................................. 67 5.9 Chapter Summary ....................................................................................................... 69 vi ©2015 Water Research Foundation. 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