Abstract
The objective of this study was to compare the performance of the repaired longitudinal cracks in API X65 pipelines under two different conditions: with patches (i.e., single and double patches) and without patches. The three-dimensional finite element method (FEM) was used to compute the stress intensity factors (SIF) at the crack tip. Repairing cracks under internal pressure using carbon-epoxy composites was investigated where the influence of both the single- and double-sided patches made of composite and adhesive were included. In the evaluation of the repair of the pipeline, the failure assessment diagram (FAD) was introduced to obtain the safety factor value. The obtained results indicated that the value of the factor of safety depends on both the crack length and the pressure. In addition, the results showed that the suggested technique is sufficient in predicting the behavior of the repairs.
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