Analysis of Failure Pressure of Defective Pipes Repaired with Composite Systems Considering the Plastic Deformation of Pipe
Résumé
Wrapping a composite material around the wall loss defective pipe is a well-known practice in pipeline rehabilitation as per guidelines provided by the design standards ISO/TS 24817 and ASME PCC-2. This work presents an analytical model to evaluate the composite repair thickness for a damaged pipeline with accounting for the plastic deformation and compare it with the results of design codes and numerical models. Hydrostatic tests performed on a repaired pipe using a composite system in different laboratories were used to validate the repair thickness using different criteria. The results show that the proposed analytical model is in good agreement with the numerical models and experimental results. The repair thickness calculated using the design codes (ISO/TS 24817 and ASME PCC-2) is more conservative, which results in repaired pipes failing outside the defect section. However, the proposed model predicts a lower composite thickness to sustain the same design pressure which enables the saving composite material. The proposed model can be refined further by accounting for the composite laminate strain using the Tsai-Hill or Hashin failure theory instead of allowable strain.
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