In the last thirty years, the attention of the offshore pipeline industry has been strongly focused on submarine pipelines crossing very uneven seabed. New pipelines crossing the uneven seabed of the Mediterranean Sea and of the North Sea and deep water pipelines crossing the uneven continental slope of the Gulf of Mexico are outstanding examples. Pipeline structural integrity may be threaten by large free-spanning sections between rocky peaks and deep depressions that may be coupled with the pipeline propensity to develop lateral/vertical deflection due to severe service conditions (High Pressure/High Temperature). Generally, these scenarios require mitigation measures aiming to control the development of excessive bending moment/deformation by means of Finite Element (FE) Modeling. FE Modeling gives a valuable contribution to the pipeline engineering at identifying a technical and cost effective solution since the early phase of the project. Finite Element (FE) Model approaches, based on standard structural finite element codes available on the market, such as ABAQUS, ADINA, ANSYS etc., are commonly used to analyze the effects of non-linearity, e.g. steel material, soil-pipe interaction and large rotations/displacements. 3-Dimensional FE Models permit to predict the overall pipeline global response under design loads taking into account the expected (during design phase) and/or actual (after measurements gathered during as-built survey campaign) 3-Dimensional pipeline configuration including 3-Dimensional (along and transversal to the pipeline route) bottom roughness, route bends, intervention works for bottom roughness and free-span correction and mitigation measures against HP/HT condition in operation. In this paper: • The design approach for HP/HT pipelines is described; • The main features of the ABAQUS FE Model, developed to predict the behavior of offshore pipelines in operation, are presented; • Two relevant examples of offshore pipelines subject to pressure and temperature conditions are presented with and without mitigation measures.
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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
Advanced Analysis and Design Tools for Offshore Pipeline in Operation
Lorenzo Bartolini,
Lorenzo Bartolini
Saipem Energy Services S.p.A., Fano, PU, Italy
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Cristian Crea,
Cristian Crea
Saipem Energy Services S.p.A., Fano, PU, Italy
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Lorenzo Marchionni,
Lorenzo Marchionni
Saipem Energy Services S.p.A., Fano, PU, Italy
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Maurizio Spinazze`,
Maurizio Spinazze`
Saipem Energy Services S.p.A., Fano, PU, Italy
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Luigino Vitali
Luigino Vitali
Saipem Energy Services S.p.A., Fano, PU, Italy
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Lorenzo Bartolini
Saipem Energy Services S.p.A., Fano, PU, Italy
Cristian Crea
Saipem Energy Services S.p.A., Fano, PU, Italy
Lorenzo Marchionni
Saipem Energy Services S.p.A., Fano, PU, Italy
Maurizio Spinazze`
Saipem Energy Services S.p.A., Fano, PU, Italy
Luigino Vitali
Saipem Energy Services S.p.A., Fano, PU, Italy
Paper No:
OMAE2011-49831, pp. 679-691; 13 pages
Published Online:
October 31, 2011
Citation
Bartolini, L, Crea, C, Marchionni, L, Spinazze`, M, & Vitali, L. "Advanced Analysis and Design Tools for Offshore Pipeline in Operation." 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. 679-691. ASME. https://doi.org/10.1115/OMAE2011-49831
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