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

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5.3.4 Wastewater Analysis. Retrieved wastewater samples were tested by American Analytical Laboratories, Inc., on April 14, 2010, in accordance with EPA Test Methods. EPA Method 150.1 was used to determine the pH of the samples. EPA Method 8015 was used to determine the DRO and GRO concentrations to test for the presence of petroleum hydrocarbons. The results are listed in Table 5-12. The pH value measured (7.54) is indicative of typical residential sewage. The wastewater analysis suggests that the wastewater stream has characteristics typical to residential areas, and no abnormal pH value or hydrocarbon concentrations were measured. Table 5-12. Results of Wastewater Analysis for Columbus 36-in. Liner Sample ID pH 86 DRO (mg/L) GRO (mg/L) Pearl 36 7.54 1.99 34.3 5.3.5 Annular Gap. A feeler gauge was used to measure the annular space around the perimeter where the sample was removed. The liner appeared to be very tight along the sides and bottom of the sample and a spacing greater than 0.127 mm was measured at only three locations (see Figure 5-31) – all along the top side of the sample removal area (see note on crown annulus gap in Section 5.3.3). The end measurements shown in Figure 5-31 were taken at approximately 4 in. from each end of the cutout and the middle measurement was taken at its center. Since the liner sample was removed from the host pipe, no laboratory annular space measurements were possible. Figure 5-31. Annular Space Measurements Around the Sample Removal Area (Columbus 36-in. Liner) 5.3.6 Liner Thickness 1.64mm 0.86mm 0.87mm Gap determined to be < .127 on sides and bottom. Feeler Gauge minimum is .127 5.3.6.1 Ultrasound Testing. An ultrasonic meter (Olympus 37DL Plus) with a 2.25 MHz contact transducer was utilized in the field in an attempt to measure the thickness of the CIPP liner (Figure 5-32). However, the ultrasound testing for thickness did not produce any readings (apparently due to the thickness of this liner). This issue is discussed further in Section 6. 5.3.6.2 Field Measurements. Caliper measurements of the exhumed liner thickness were recorded around the edges of the extracted sample in the field as shown in Figure 5-33. The liner thickness measurements taken in the field are shown in Figure 5-34. The average thickness for the sample was calculated to be 14.2 mm and standard deviation was 1.5 mm. The original design thickness was not known, but it was assumed to be 15 mm (i.e., the same as the liner used for the adjacent line).
Figure 5-32. Ultrasonic Testing for Measuring Liner Thickness in the Field 15.60mm 15.59mm 13.69mm 13.50mm 15.57mm seam 15.57mm 14.55mm 11.45mm SAMPLE 11.61mm Figure 5-33. Caliper Measurements of Columbus 36-in. Sample Figure 5-34. Field Measurements of Thickness for Columbus 36-in. Liner 87 14.53mm
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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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Page 55 and 56: 4.2.12 Buckling Test. A steel mecha
Page 57 and 58: Figure 4-18. Pressure Gage and Pres
Page 59 and 60: 4.2.13 Shore D Hardness. Durometer
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Page 63 and 64: increases and the heat of cure decr
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Page 67 and 68: Figure 4-28. Thickness for Denver 4
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Page 81 and 82: 5.1 Introduction 5.0: CITY OF COLUM
Page 83 and 84: April 16, 2010 The specimen was rec
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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
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Page 107 and 108: Table 5-13. Geometric Data for Flex
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Page 111 and 112: 6.1 Introduction 6.0: REVIEW AND CO
Page 113 and 114: Overall, the liners appear to be ho
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Page 117 and 118: Looking for correlations to the low
Page 119 and 120: A significantly lower range of Shor
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Page 125 and 126: Table 7-3. Overall Structure for a
Page 127 and 128: Table 8-2. CIPP and Other Rehabilit
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Page 135 and 136: experience and quality, and do not
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Page 147 and 148: 9.2 Recommendations for Future Work
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Page 153 and 154: APPENDIX A LIST OF TEST STANDARDS R
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The following table lists the non-A
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B.1 Introduction This study was con
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Mean thickness values for each cont
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APPENDIX C INTERNATIONAL STUDY INTE
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The original Insituform liner insta
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However, the figures published by O
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exfiltration and infiltration. Any
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STW uses CIPP for virtually all of
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method. Top hat repairs to junction
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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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