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TABLES 1.1 Performance of different pipe materials.............................................................................1 1.2 Average failure rates (per 62 mile) from UKWIR national failure database .....................2 2.1 Differences between PE3608 and PE4710.......................................................................10 2.2 Sample HDPE pipe pressure ratings for water at 80oF.....................................................10 2.3 Small diameter PE4710 recurring surge tests (Cycles 0 to 1.5 times PC) .......................14 2.4 DR 21 pressure design examples for different velocities for PE4710 pipe at 73 ̊F ....................................................................................................................15 2.5 Cycles to failure for PE4710 and PE100..........................................................................15 2.6 Temperature compensation multiplier applied to HDPE pressure class ..........................16 2.7 Kobe earthquake water pipe failure rates .........................................................................18 2.8 Commonly used water pipeline materials, standards and vulnerability to ground deformation ............................................................................................................19 2.9 Advantages and limitations of HDPE pipes .....................................................................21 3.1 HDPE pipes age distribution ............................................................................................25 3.2 HDPE pipes diameter distribution....................................................................................26 3.3 Types of permitted HDPE pipes.......................................................................................27 3.4 Number of responses for causes of rupture or leakage for PE4710 (16 in. to 24 in.) ......31 3.5 Number of responses for causes of rupture or leakage for PE4710 (larger than 24 in.)..................................................................................................32 3.6 Number of responses for causes of rupture or leakage for PE3608/3408 (16 in. to 24 in.)......................................................................................................33 3.7 Number of responses for causes of rupture or leakage for PE3608/3408 (larger than 24 in.)..................................................................................................34 3.8 Durability and reliability of HDPE pipes .........................................................................37 3.9 General comments from responding water utilities .........................................................38 ix ©2015 Water Research Foundation. ALL RIGHTS RESERVED.PDF Image | Large Diameter HDPE Pipe for Water Main Applications
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