Performance Assessment of Polymeric Composite Wrap to Repair Damaged Pipelines Exposed under Accelerated Environment Conditions
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 12, Issue 3
Abstract
Fiber-reinforced polymer composites are used as emerging materials to repair oil and gas transmission pipelines without stopping the flow of fluids inside. These pipelines are subjected to harsh environment conditions such as being buried under soil and being exposed to high humidity, high temperatures, and different chemicals. It is important to predict the useful life of composite repairs in these harsh conditions in order to design better and to have robust repair solutions. This study evaluates mechanical properties, namely tensile strength tensile modulus, flexural strength, flexural modulus, and lap shear strength, of composite laminates when exposed to harsh environmental conditions such as hot-wet [ relative humidity (RH)] for 0, 2, 4, and , steam autoclave [121°C and 1,05,000 Pa (1.05 bar)] for 0, 6, and , and ultraviolet (UV) ray exposure of type UVA-340 at 50°C for 0 and . The glass fiber–reinforced polymer (GFRP) composite laminates are prepared by hand layup process and are cut using a water-jet cutting process to avoid machining defects and to keep a good surface finish. The specimens are exposed to these corresponding environmental conditions for different periods of time, and the changes in their mechanical properties are studied. The tensile strength, flexural modulus, and lap shear strength values are compared with unexposed specimens. Decreases in strength and modulus values are observed for exposed specimens. A simple empirical expression is developed to predict the usable lifetime of a composite repair system exposed to such different harsh environmental conditions.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The entire research work, including sample preparation, conducting relevant tests, and providing the intellectual support, was done at M/S Vasitars Pvt. Ltd. (www.vasitars.com), a pioneer Indian company offering a nanofiller reinforced–polymer composite repair system for damaged pipelines.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 12 • Issue 3 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 1, 2020
Accepted: Dec 4, 2020
Published online: Apr 15, 2021
Published in print: Aug 1, 2021
Discussion open until: Sep 15, 2021
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