Abstract
This research work undertakes root cause failure analysis of fractured glass fiber-reinforced polymer composite pipe. A sequential macro- and micro-level investigation was performed to disclose the potential failure cause. Results showed that swelling on the pipe was attributed to water absorption during the service life of the pipe. The corrosion barrier in the form of resin-rich liner on the pipe interior deteriorated and was removed by chemical attack. Resin removal caused exposure of reinforcing fibers to harsh sea environment. Diffusion of water within the matrix accelerated the corrosion attack by sodium hypochlorite solution, which was being pumped through the pipe toward brine de-chlorination area. Micro-examination indicated that the fiber–matrix interface was chemically attacked by sodium hypochlorite solution, significantly reducing pipe structural integrity. The carbon, hydrogen and chlorine bonds in the internal surface had undergone prominent bond stretching, which was generally attributed to oxidation. The swelling and deformation in the pipe indicated that the fluid was being held in the pipe for longer duration than the maximum specified time as per design, which ultimately led to the failure.
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The authors would like to appreciate Institute of Space Technology (IST) and AJA Engineering Consultancy for the support rendered in completion of the subject failure analysis.
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Ali, A.J., Toor, Z.S., Shifa, M. et al. Root Cause Analysis of Glass Fiber-Reinforced Polymer Composite Pipe Failed in Marine Environment. J Fail. Anal. and Preven. (2024). https://doi.org/10.1007/s11668-024-01926-6
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DOI: https://doi.org/10.1007/s11668-024-01926-6