Analysis of Failure Pressure of Defective Pipes Repaired with Composite Systems Considering the Plastic Deformation of P
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ORIGINAL CONTRIBUTION
Analysis of Failure Pressure of Defective Pipes Repaired with Composite Systems Considering the Plastic Deformation of Pipe S. Budhe1,2
•
M. D. Banea1
•
S. de Barros1,3
Received: 12 May 2020 / Accepted: 24 August 2020 Ó The Institution of Engineers (India) 2020
Abstract 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.
& S. Budhe [email protected] 1
CEFET/RJ, Federal Center of Technological Education of Rio de Janeiro, Av-Maracana˜ 229, 20271-110 Rio de Janeiro, RJ, Brazil
2
Department of Mechanical Engineering, National Institute of Technology, Calicut 673601, India
3
Institut de Rechercheen Ge´nie Civil et Me´canique, Universite´ de Nantes, Saint-Nazaire, France
Keywords Composite repair thickness Analytical modelling Plastic deformation Corroded pipelines Composite materials
Introduction The repair of corroded/damaged pipelines with fibre-reinforced polymer composite materials is a well-developed practice in many industries over the conventional repair methods. Metallic pipeline repairs made with FRP materials offer many benefits which include: lightweight, high strength and stiffness, corrosion prevention, quick repair, safety and cost-effective process [1–4]. Besides these advantages, still several issues need to be focused in detail for better performance of the composite repair system. These issues include: design pressure, delamination between the metal pipe and composite sleeve, effect of the infill (putty) material, composite repair thickness and analytical modelling [5–8]. Complete guidelines of the composite repair system of damaged pipelines are well-described through the ISO/TS 24817 and ASME PCC-2 standards [9, 10]. Many researchers investigated the performance of composite repair system with respect to material (composite material, adhesive and putty) and geometrical (pipe defect geometry, sleeve repair thickness, fibre orientation)
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