Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...

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The direct costs for the city preparation activities and the contractor site work for the two retrospective evaluations in Denver are approximately identified as indicated in Table 7-1. Table 7-1. Field Work Costs for Sample Retrieval in Denver Site/Cost Item Cost Cost for Excavation and Removal of 8-in. Clay Sewer Pipe at 1st Ave. and Monroe Alley $ 22,800 Cost for Sample Retrieval and Patching for 48 in. brick sewer $ 1,600 Total Cost $ 24,400 7.2.2 City of Columbus Costs. The discussions with the City of Columbus began with an expression of interest by the City at the TTC Industry Advisory Board meeting in October 2009. Followup discussions were held by phone and email in the winter 2009-2010 and a planning meeting was held in Columbus on February 16, 2010. The sites were chosen to select a 36-in. diameter, 21-year old lined pipe for CIPP sample retrieval only and to retrieve a host pipe plus CIPP liner from a 5-year old, 8-in. sewer line that was being replaced because the line needed to be upsized. The principal reason for selecting a relatively newly relined pipe for inclusion was that the city could not absorb the cost of a separate dig-up and replace just for the retrospective study. The direct costs for the city for the two retrospective evaluations in Columbus are shown in Table 7-2. Table 7-2. City of Columbus Costs Site / Cost Item Cost Pay item for Richards Rd – Open Cut Open Cut Point Repair, 8 in.-12 in. Depth
combining this broadly available information with additional detailed evaluations of selected liners. It should be noted in this regard that selecting liners with more severe exposure conditions or other circumstances likely to cause an accelerated deterioration may provide a greater understanding about deterioration mechanisms, but may not be representative of the deterioration of liners in general use. To get the best value from retrospective evaluation activities, it is recommended that a dual track be followed in which aggregated experiential and condition assessment information on lined pipes be collected from cities that are willing to participate together with continued intensive evaluation of liners that have seen a variety of service conditions. Municipalities have shown great interest in having better nationwide information on the experience with the rehabilitation technologies that they are using or considering. It also appears from the discussions with municipalities regarding the pilot studies described here that municipalities would be willing to participate in providing data about their own experiences in return for being able to access the nationally aggregated information. Some municipalities may have limited resources to assist in the dig up and retrieval of host pipe samples or even liner coupons (from larger diameter pipes). As mentioned earlier, being able to combine the sample retrieval with other needed work – either on the sewer, on neighboring utilities, or on the pavement above the sewer – significantly eases the decision of the municipality to participate. 7.4 Aggregating National Data on Liner Performance Since the ultimate goal of carrying out retrospective evaluations is to be able to provide better guidance to municipalities on the long-term performance of the various rehabilitation technologies available to them, it is worth looking ahead as to how that data might be collected into a national database. Table 7-3 provides a summary of an overall structure that could be used for such a database. The agency or municipality will be the key provider of the information and the agency name, contact information for the person providing the data, system size, and current extent of rehabilitation should be recorded. Various agencies would have differences in the types of technologies used and the specifics of those technology applications. It is suggested that the categorization of the city experiences be able to be as detailed as the city data would allow, but would also allow information capture at a broader level when only that level of information was available. For example, Agency A may be able to break down their experiences with CIPP installations by whether they were hot-water or steam-cured, which type of resin was used, etc. Agency B may only have retained sufficient records to be able to provide information on the length of lines rehabilitated with CIPP and their general experiences with CIPP. The database should be able to focus on or exclude specific variants if desired or to analyze all of the CIPP data in aggregate. As discussed in Section 7.3, broad interpreted data from agency records, CCTV inspections, and condition assessment databases needs to be able to be accessed in the database in addition to well characterized, quantitative data from retrospective liner testing or the use of specific NDT approaches to liner evaluation. It is not intended that the database proposed would attempt to include all of the individual CCTV or condition assessment data that cities are collecting. Rather, the database proposed would contain the interpreted results from agencies of the performance of rehabilitation technologies plus specific physical or NDT that addresses liner performance or degradation. The aggregation of all inspection and condition assessment information would provide additional opportunities for understanding liner performance, but is an effort that would require a larger level of resources to accomplish. 105
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EPA/600/R-12/004 | January 2012 | w
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DISCLAIMER The work reported in thi
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ACKNOWLEDGMENTS This report has bee
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samples had a flexural modulus valu
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CONTENTS DISCLAIMER ...............
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4.3.10.2 Upstream Sample ..........
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9.2.2 Recommendations for Developme
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Figure 5-27. Raman Spectra for the
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ABBREVIATIONS AND ACRONYMS AMP Asse
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1.0: INTRODUCTION This report forms
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1.2 Organization of the Report Foll
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Some sections of a sewer system may
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• The depth of the pipe below the
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Figure 2-3 highlights the main diff
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The most commonly used resins are i
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the glass fiber. The tube, which is
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3.0: DEVELOPMENT OF CIPP EVALUATION
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• The municipality would be willi
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• Measurements and/or physical sa
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Table 3-3. Laboratory Evaluation an
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4.1 Introduction 4.0: CITY OF DENVE
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Figure 4-1. Images of the Recovered
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Sample ID Figure 4-4. Soil Grain Si
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Location Table 4-5. Denver 8-in. Li
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Profile Plot Red - Steel tube Green
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Table 4-7. Results from Flexural Te
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35 Table 4-9. Comparison of Test Da
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4.2.12 Buckling Test. A steel mecha
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Figure 4-18. Pressure Gage and Pres
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4.2.13 Shore D Hardness. Durometer
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Figure 4-24. Barcol Hardness Readin
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increases and the heat of cure decr
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In summary, CCTV inspection of thre
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Figure 4-28. Thickness for Denver 4
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4.3.6.2 Downstream Sample. Seven sp
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Page 73 and 74: Table 4-18. Flexural Test Results f
Page 75 and 76: 4.3.8.2 Upstream Sample. Specimens
Page 77 and 78: 4.3.10 Barcol Hardness 4.3.10.1 Dow
Page 79 and 80: 4.3.11.2 Downstream Sample. The Ram
Page 81 and 82: 5.1 Introduction 5.0: CITY OF COLUM
Page 83 and 84: April 16, 2010 The specimen was rec
Page 85 and 86: The resulting gradation curves are
Page 87 and 88: Table 5-4. Soil pH at Designated Lo
Page 89 and 90: Figure 5-8. Average Thickness at Di
Page 91 and 92: 5.2.12 Flexural Testing. Specimens
Page 93 and 94: Figure 5-14. Flexural Stress-Strain
Page 95 and 96: Figure 5-16. Tensile Stress-Strain
Page 97 and 98: 5.2.15 Buckling Test. A mechanical
Page 99 and 100: Figure 5-24. Localized Leak on the
Page 101 and 102: Figure 5-26. Barcol Hardness Readin
Page 103 and 104: 5.3.3 Visual Inspection of Liner. I
Page 105 and 106: Figure 5-32. Ultrasonic Testing for
Page 107 and 108: Table 5-13. Geometric Data for Flex
Page 109 and 110: Figure 5-38. Shore D Hardness of Co
Page 111 and 112: 6.1 Introduction 6.0: REVIEW AND CO
Page 113 and 114: Overall, the liners appear to be ho
Page 115 and 116: age difference between the liners i
Page 117 and 118: Looking for correlations to the low
Page 119 and 120: A significantly lower range of Shor
Page 121: 7.0: RECOMMENDED TEST PROTOCOL FOR
Page 125 and 126: Table 7-3. Overall Structure for a
Page 127 and 128: Table 8-2. CIPP and Other Rehabilit
Page 129 and 130: Table 8-5. Rehabilitation Specifica
Page 131 and 132: 113 Table 8-9. Process Verification
Page 133 and 134: Göttingen Stadtentwässerung: Göt
Page 135 and 136: experience and quality, and do not
Page 137 and 138: km of pipe and 50-year-old pipes ar
Page 139 and 140: methods are detailed in the Guide t
Page 141 and 142: The business of pipeline rehabilita
Page 143 and 144: • Destructive testing (but will n
Page 145 and 146: In Denver, in CCTV inspections of n
Page 147 and 148: 9.2 Recommendations for Future Work
Page 149 and 150: Falter, B. 1996. “Structural Anal
Page 151 and 152: Lehmann, M.A, J.P. Schroeder and C.
Page 153 and 154: APPENDIX A LIST OF TEST STANDARDS R
Page 155 and 156: The following table lists the non-A
Page 157 and 158: B.1 Introduction This study was con
Page 159 and 160: Mean thickness values for each cont
Page 161 and 162: APPENDIX C INTERNATIONAL STUDY INTE
Page 163 and 164: The original Insituform liner insta
Page 165 and 166: However, the figures published by O
Page 167 and 168: exfiltration and infiltration. Any
Page 169 and 170: STW uses CIPP for virtually all of
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All design and construction supervi
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Process verification test samples a
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consultant born out of the corporat
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BW continues to use CIPP, mainly in
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East, but has not yet had marked su
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