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4.1 Summary of project workshops........................................................................................41 4.2 Workshops participants’ affiliation ..................................................................................42 4.3 Issues raised by workshop participants ............................................................................44 4.4 Top five issues from workshop #1 ...................................................................................46 4.5 Short-listed issues from workshop #2 ..............................................................................46 4.6 Reasons for perception issue ............................................................................................50 4.7 Strategies to overcome perception issues .........................................................................51 4.8 Designs, installation/contractor, inspection and maintenance issues ...............................52 4.9 Strategies to address design, installation & maintenance issues ......................................53 4.10 Joining methods/fitting issues ..........................................................................................55 4.11 Strategies to address joining methods/fittings issues .......................................................56 5.1 HDPE pipe sample measurements ...................................................................................60 5.2 Diameter variations after 3 months (from 125 to 188 psi) ...............................................64 5.3 Diameter Variations...........................................................................................................66 5.4 Length variations ...............................................................................................................66 5.5 Number of surges for 50 and 100 years ...........................................................................67 5.6 Cycles to failure for 16-in. diameter PE4710...................................................................67 5.7 Diameter expansion of pipe sample for number of surges completed .............................67 5.8 Changes in pipe sample for 50,000 occasional surges .....................................................68 6.1 Case study key findings....................................................................................................82 A.3.1 Rating causes of rupture or leakage for PE4710 (16 in. to 24 in.) ...................................99 A.3.2 Rating causes of rupture or leakage for PE4710 (Larger than 24 in.)............................100 A.3.3 Rating causes of rupture or leakage for PE3608/3408 (16 in. to 24 in.) ........................101 x ©2015 Water Research Foundation. ALL RIGHTS RESERVED.PDF Image | Large Diameter HDPE Pipe for Water Main Applications
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