Study on Corrosion Resistant Alloy Lined Pipe Delamination
- Antoine Jardin (SAIPEM SA) | Shulong Liu (SAIPEM SA) | Diego Pavone (SAIPEM SA) | Vincent Cocault-Duverger (SAIPEM SA)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- delamination, liner, Lined pipe, FE analysis, wrinkling
- 3 in the last 30 days
- 43 since 2007
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CRA lined pipelines offer a cost-effective solution for the development of subsea oilfield facing a challenging produced fluid chemistry. Such linepipe brings however additional challenges from a design, fabrication installation and operation standpoint, more or less documented within the industry. This paper discusses some key aspect of the methodology recently used by Saipem to assess the safety of lined pipes, focusing on two main reported failure modes:
- Liner excessive delamination potentially leading to form instability and
- Liner collapse as a result of combined loading, also known as wrinkling
As oil industry tries to reduce costs at all levels, the demand for safe and robust yet cheaper alternative to full CRA linepipe has recently increased. CRA lined standard carbon steel linepipe is an attractive alternative but brings additional challenges, particularly in deep-water. For oil field developments, designing the pipeline for sour service conditions, CRA lined pipe with joint weld overlay is often used to meet these challenges. Intensive numerical simulations and experimental tests, including inspection of the fabricated lined pipe to ensure the pipeline's integrity, were performed by former researchers to identify and address the issues and fit for service.
Delaminations, failure in the laminated materials of a lined pipe, may pre-exist due to various causes. Such delaminations may locally buckle inwards affecting the collapse pressure of the tubes. The consideration of delamination buckling is important for safe design. Rasheed and Tassoulas (1996) developed a numerical procedure for delamination analysis of composite tubes and proposed a cross section finite element (See Figure 1).
Rasheed and Tassoulas (2001) overviewed procedures of delamination growth analysis. The energy release rate calculation was formulated for composite delaminated tubular cross sections and specialized to a finite element model for delamination buckling and growth analysis of long laminated composite tubes taking into account initial geometric imperfections, large deformations, contact between delamination faces and material degradation. The formulation was used to study the potential of delamination growth in a hybrid composite tube. Parametric studies were conducted to assess the effects of delamination length, location and geometric imperfection on growth.
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