Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
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6.3 Summary for City <strong>of</strong> Columbus <strong>Evaluation</strong>s .............................................................................. 94<br />
6.4 Summary <strong>of</strong> Data and Observations for All Sites ....................................................................... 95<br />
6.4.1 Visual Observations ....................................................................................................... 95<br />
6.4.2 Annular Gap .................................................................................................................. 95<br />
6.4.3 L<strong>in</strong>er Thickness ............................................................................................................. 95<br />
6.4.4 Specific Gravity and Porosity ........................................................................................ 96<br />
6.4.5 Strength and Flexural Modulus ..................................................................................... 98<br />
6.4.6 Buckl<strong>in</strong>g Tests ............................................................................................................. 100<br />
6.4.7 Surface Hardness Tests ................................................................................................ 100<br />
6.4.8 Raman Spectroscopy and Other Polymer Test<strong>in</strong>g ....................................................... 101<br />
6.5 Current F<strong>in</strong>d<strong>in</strong>gs ....................................................................................................................... 101<br />
6.5.1 Material Degradation ................................................................................................... 101<br />
6.5.2 Conformance <strong>of</strong> Sampled L<strong>in</strong>ers to Orig<strong>in</strong>al Specifications ....................................... 101<br />
6.5.3 Prognosis for Rema<strong>in</strong><strong>in</strong>g Life ...................................................................................... 102<br />
6.5.4 Test<strong>in</strong>g Issues .............................................................................................................. 102<br />
7.0: RECOMMENDED TEST PROTOCOL FOR FUTURE USE ................................................... 103<br />
7.1 Overview <strong>of</strong> Protocol Implications ........................................................................................... 103<br />
7.2 Fieldwork Costs ........................................................................................................................ 103<br />
7.2.1 City <strong>of</strong> Denver Costs ................................................................................................... 103<br />
7.2.2 City <strong>of</strong> Columbus Costs ............................................................................................... 104<br />
7.3 Develop<strong>in</strong>g an Extended Program for <strong>Retrospective</strong> <strong>Evaluation</strong> ............................................. 104<br />
7.4 Aggregat<strong>in</strong>g National Data on L<strong>in</strong>er Performance ................................................................... 105<br />
8.0: REPORT ON INTERNATIONAL SCAN ACTIVITIES AND FINDINGS ............................. 108<br />
8.1 Introduction .............................................................................................................................. 108<br />
8.2 Rehabilitation Experience ......................................................................................................... 108<br />
8.3 Specifications and Design......................................................................................................... 110<br />
8.4 Preparation and Supervision ..................................................................................................... 111<br />
8.5 Verification and Test<strong>in</strong>g ........................................................................................................... 112<br />
8.6 Utilities’ Views on Effectiveness <strong>of</strong> Sewer Rehabilitation ...................................................... 114<br />
8.6.1 Based on Long-Term Samples .................................................................................... 114<br />
8.6.2 Based on CCTV Inspections ........................................................................................ 115<br />
8.6.3 Based on General Experience ...................................................................................... 115<br />
8.7 CIPP Use and Test<strong>in</strong>g <strong>in</strong> Japan ................................................................................................. 117<br />
8.8 Approach to <strong>Retrospective</strong> <strong>Evaluation</strong> <strong>in</strong> Quebec ................................................................... 123<br />
9.0: SUMMARY AND RECOMMENDATIONS................................................................................ 126<br />
9.1 Summary ................................................................................................................................... 126<br />
9.1.1 Tasks to Date ............................................................................................................... 126<br />
9.1.2 CIPP L<strong>in</strong>er Condition F<strong>in</strong>d<strong>in</strong>gs to Date....................................................................... 126<br />
9.1.3 Initial F<strong>in</strong>d<strong>in</strong>gs on Value <strong>of</strong> Various Physical Test<strong>in</strong>g Approaches ............................ 127<br />
9.1.3.1 Soil Conditions ............................................................................................ 127<br />
9.1.3.2 Visual Inspection ......................................................................................... 127<br />
9.1.3.3 Thickness and Annular Gap ........................................................................ 127<br />
9.1.3.4 Flexural and Tensile Test<strong>in</strong>g ....................................................................... 128<br />
9.1.3.5 Surface Hardness Test<strong>in</strong>g ............................................................................ 128<br />
9.1.3.6 Material Composition Test<strong>in</strong>g ..................................................................... 128<br />
9.1.4 Recommendations for National Data Compilation and Management. ........................ 128<br />
9.2 Recommendations for Future Work ......................................................................................... 129<br />
9.2.1 Recommendations for Cont<strong>in</strong>ued <strong>Retrospective</strong> <strong>Evaluation</strong>s on Retrieved Samples . 129<br />
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