Use of Optical Fibers to Investigate Strength Limit States for Pressure Pipe Liners Spanning across Circular Perforations
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 12, Issue 2
Abstract
Local strain concentrations that develop where cured-in-place pipe liners span across perforations in the wall of the cast iron host pipe have been identified as a key limit state. However, difficulties measuring strain have resulted in minimal experimental support for existing theoretical findings. This paper reports on the use of distributed strain sensing with polyimide optical fibers to quantify strain profiles along the inside surface of a liner and the outside where the liner is exposed at a perforation through the pipe wall. Measured strains are compared to theoretical calculations to assess performance of the design model currently used for selecting liner thickness. Results obtained confirm that the peak axial strain location moves from the center of the perforation to the edge at perforation diameters above the limiting flat plate criterion. The measurements also support the use of current ASTM design rules for pressure pipe liners spanning across small sized perforations (up to 50-mm diameter in a 154-mm diameter pipe). However, ASTM design produces unconservative estimates for larger perforations.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, including the experimental data.
Acknowledgments
The authors acknowledge funding from the Natural Sciences and Engineering Research Council of Canada (NSERC) through a Strategic Research Grant to Drs. Moore and Hoult to support Dr. Adebola. Support was provided by the Canada Foundation for Innovation and the Government of Ontario to fund the fiber optic strain analyzer. Thanks are extended to Dr. Martin Bureau and M. Gilles Gagnon of Sanexen Environmental Services Inc. for providing the test specimens. Finally, the excellent contributions of Mr. Graeme Boyd and Mr. Joshua Coughlan to the experimental work are gratefully acknowledged.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 12 • Issue 2 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 14, 2020
Accepted: Sep 2, 2020
Published online: Feb 27, 2021
Published in print: May 1, 2021
Discussion open until: Jul 27, 2021
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