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 5-10. Pr<strong>of</strong>ile Plott<strong>in</strong>g with LVDT Rotat<strong>in</strong>g on the Inner Circumference:<br />
Close Up (Left) and Complete View (Right)<br />
Pr<strong>of</strong>il<strong>in</strong>g was performed before and after the buckl<strong>in</strong>g test. The pr<strong>of</strong>ile plotter was not used dur<strong>in</strong>g the<br />
test due to the risk <strong>of</strong> water leakage and/or sudden failure that might damage the LVDT.<br />
Figure 5-11 compares the pre-buckl<strong>in</strong>g and post-buckl<strong>in</strong>g pr<strong>of</strong>ile plots. From the pre-buckl<strong>in</strong>g pr<strong>of</strong>ile<br />
plot, it can be seen that the l<strong>in</strong>er did not follow a perfect circular shape. The l<strong>in</strong>er had several<br />
irregularities that probably matched irregularities <strong>in</strong> the orig<strong>in</strong>al host pipe with the largest excursion<br />
(nearly a quarter <strong>in</strong>ch outwards) from a circular shape occurr<strong>in</strong>g at the <strong>in</strong>vert <strong>of</strong> the l<strong>in</strong>er. The ovality <strong>of</strong><br />
the l<strong>in</strong>er calculated <strong>in</strong> accordance with ASTM F1216 was 7.4%. It should be noted that for the buckl<strong>in</strong>g<br />
test (described <strong>in</strong> Section 5.1.15), the l<strong>in</strong>er was <strong>in</strong>serted and sealed with<strong>in</strong> a circular steel pipe.<br />
Figure 5-11. Pr<strong>of</strong>ile Plot <strong>of</strong> Steel Host <strong>Pipe</strong> and L<strong>in</strong>er Before and After the Buckl<strong>in</strong>g<br />
Test (Columbus 8-<strong>in</strong>. L<strong>in</strong>er)<br />
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