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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Figure 5-8. Average Thickness at Different Locations (Columbus 8-<strong>in</strong>. L<strong>in</strong>er)<br />
5.2.10 Specific Gravity and Porosity. Measurements <strong>of</strong> density and porosity <strong>of</strong> a sample from this<br />
l<strong>in</strong>er specimen were made by TTC and by Micrometrics Analytical Services. The TTC result for specific<br />
gravity (based on test<strong>in</strong>g <strong>of</strong> 7 samples) was 1.11 ± 0.94. In the Micrometrics test<strong>in</strong>g (us<strong>in</strong>g mercury<br />
penetration for the porosity determ<strong>in</strong>ation), the bulk density (at 0.54 psia) was 1.1739 g/mL, the apparent<br />
(skeletal) density was 1.2782 g/mL, and the porosity was 8.163%. The full test report is provided <strong>in</strong><br />
Appendix C and the specific gravity results across all samples are compared and discussed <strong>in</strong> Section 6.<br />
5.2.11 Ovality. A pr<strong>of</strong>ile plotter (Figure 5-9) developed at TTC was used to obta<strong>in</strong> a pr<strong>of</strong>ile <strong>of</strong> the<br />
<strong>in</strong>terior <strong>of</strong> the l<strong>in</strong>er to be tested for buckl<strong>in</strong>g under external pressure. This pr<strong>of</strong>il<strong>in</strong>g system is equipped<br />
with an LVDT rotat<strong>in</strong>g a full circle <strong>in</strong> one and one-half m<strong>in</strong>utes. The voltage read<strong>in</strong>g changes as the tip<br />
<strong>of</strong> the LVDT moves axially and those read<strong>in</strong>gs were collected us<strong>in</strong>g an HP 34970A DAQ. Later, the data<br />
was processed to obta<strong>in</strong> the actual pr<strong>of</strong>ile <strong>of</strong> the l<strong>in</strong>er’s <strong>in</strong>side circumference. Before pr<strong>of</strong>il<strong>in</strong>g, the pipe<br />
and pr<strong>of</strong>ile plotter were positioned horizontally (Figure 5-10) and aligned. Figure 5-11 shows the plotted<br />
circumferential pr<strong>of</strong>ile <strong>of</strong> the l<strong>in</strong>er.<br />
Figure 5-9. Electronic Level Used to Position Horizontally the <strong>Pipe</strong> (Left) and the<br />
Pr<strong>of</strong>ile Plotter (Right)<br />
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