An account is given of the methods used to evaluate the operating structural performance of a reel laid deepwater oil HP/HT pipeline which had been designed based on the controlled lateral buckling principle. The objective was to develop a finite element (FE) model of the line based on its operating status and to use the model to confirm its present and future structural integrity. The line is surface laid on a fairly undulating soft clay seabed at its deep end and sand at the shallower end. It incorporates three different man-made buckle triggering mechanisms of buoyancy modules, dual sleepers and locally increased lateral curvature along its entire length. The steps involved in the inclusion of the in-situ operating condition of the pipeline, provided through various surveys made of the as-built and operating line and historical records of operating temperatures and pressures and flow rates made at inlet and outlet of the line, into the FE model, is discussed. Several key considerations essential for the successful development and validation of such an operation-based FE model, and for completion of the evaluation task, are highlighted in the paper. Also, a specific challenge encountered as a result of changes in regulatory guidelines on engineering critical assessments, from initial design to current evaluation stage, is discussed. The evaluation has demonstrated that it is feasible to carry out in-situ assessments of laterally buckling subsea lines, and that such assessments can provide not only reliable information regarding current and future structural integrity of the lines, but also invaluable confirmation of initial design data and rationale. This comparison between initial design and the actual operating behavior of the line is not included in this paper but will be described in detail in a future separate paper.
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ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2011
Rotterdam, The Netherlands
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4436-6
PROCEEDINGS PAPER
Evaluation of the Operational Behaviour of a Deepwater Oil Export Pipeline Designed on the Basis of Controlled Lateral Buckling
T. Sriskandarajah,
T. Sriskandarajah
Subsea7 Ltd., Sutton, Surrey, UK
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Arek Bedrossian,
Arek Bedrossian
Subsea7 Ltd., Sutton, Surrey, UK
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Graeme Roberts,
Graeme Roberts
Subsea7 Ltd., Sutton, Surrey, UK
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Rafael F. Solano,
Rafael F. Solano
Petrobras, Rio de Janeiro, Brazil
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Alexandre Hansen,
Alexandre Hansen
Petrobras, Rio de Janeiro, Brazil
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Bruno R. Antunes
Bruno R. Antunes
Petrobras, Rio de Janeiro, Brazil
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T. Sriskandarajah
Subsea7 Ltd., Sutton, Surrey, UK
Arek Bedrossian
Subsea7 Ltd., Sutton, Surrey, UK
Graeme Roberts
Subsea7 Ltd., Sutton, Surrey, UK
Peter Tanscheit
Subsea7, Niteroi, Brazil
Rafael F. Solano
Petrobras, Rio de Janeiro, Brazil
Alexandre Hansen
Petrobras, Rio de Janeiro, Brazil
Bruno R. Antunes
Petrobras, Rio de Janeiro, Brazil
Paper No:
OMAE2011-50188, pp. 915-923; 9 pages
Published Online:
October 31, 2011
Citation
Sriskandarajah, T, Bedrossian, A, Roberts, G, Tanscheit, P, Solano, RF, Hansen, A, & Antunes, BR. "Evaluation of the Operational Behaviour of a Deepwater Oil Export Pipeline Designed on the Basis of Controlled Lateral Buckling." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 4: Pipeline and Riser Technology. Rotterdam, The Netherlands. June 19–24, 2011. pp. 915-923. ASME. https://doi.org/10.1115/OMAE2011-50188
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