This paper aims at assessing the reliability of pipelines with local corrosion defects subjected to external pressure. Several collapse strength models are calibrated and then used to formulate the reliability problem of corroded pipelines. Model uncertainty factors are derived for the various collapse strength models based on available experimental results to better predict the effect of local corrosion defects on the reduction of the collapse strength of pipelines. The model uncertainty factor is defined as function of the depth of the local corrosion defect and calibrates the overconservative predictions of collapse strength models that deal with the effect of corrosion defects by considering a uniform reduction of the pipe thickness. The collapse strength models together with the corresponding model uncertainty factors are then used to formulate the reliability problem of pipelines with local corrosion defects subjected to external pressure. Parametric and sensitivity analyses are performed for different levels of corrosion damages to identify the influence of the various parameters on the collapse probability of corroded pipelines under external pressure. Finally, an approach is suggested to calibrate a design code formulation that is conservative when the minimum pipe thickness is used to represent a local corrosion defect. The approach consists of identifying an equivalent depth of the corrosion defect, corresponding to an intermediate thickness of the corroded pipeline larger than the minimum thickness, that adjusts the design code to match the safety levels of the collapse strength model calibrated to the experimental results.
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October 2019
Research-Article
Reliability Analysis of Pipelines With Local Corrosion Defects Under External Pressure
A. P. Teixeira,
A. P. Teixeira
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1,
Lisboa, 1049-001, Portugal
e-mail: teixeira@centec.tecnico.ulisboa.pt
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1,
Lisboa, 1049-001, Portugal
e-mail: teixeira@centec.tecnico.ulisboa.pt
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O. G. Palencia,
O. G. Palencia
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa, 1049-001, Portugal
e-mail: oscar.palencia@centec.tecnico.ulisboa.pt
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1
,Lisboa, 1049-001, Portugal
e-mail: oscar.palencia@centec.tecnico.ulisboa.pt
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C. Guedes Soares
C. Guedes Soares
Fellow ASME
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa, 1049-001, Portugal;
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1
,Lisboa, 1049-001, Portugal;
Ocean Engineering Department,
COPPE,
Federal University of Rio de Janeiro,
Rio de Janeiro, 21941-972, Brazil
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
COPPE,
Federal University of Rio de Janeiro,
Rio de Janeiro, 21941-972, Brazil
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
Search for other works by this author on:
A. P. Teixeira
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1,
Lisboa, 1049-001, Portugal
e-mail: teixeira@centec.tecnico.ulisboa.pt
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1,
Lisboa, 1049-001, Portugal
e-mail: teixeira@centec.tecnico.ulisboa.pt
O. G. Palencia
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa, 1049-001, Portugal
e-mail: oscar.palencia@centec.tecnico.ulisboa.pt
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1
,Lisboa, 1049-001, Portugal
e-mail: oscar.palencia@centec.tecnico.ulisboa.pt
C. Guedes Soares
Fellow ASME
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa, 1049-001, Portugal;
Centre for Marine Technology and Ocean
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, No. 1
,Lisboa, 1049-001, Portugal;
Ocean Engineering Department,
COPPE,
Federal University of Rio de Janeiro,
Rio de Janeiro, 21941-972, Brazil
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
COPPE,
Federal University of Rio de Janeiro,
Rio de Janeiro, 21941-972, Brazil
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received August 18, 2017; final manuscript received December 19, 2018; published online February 15, 2019. Assoc. Editor: Theodoro Antoun Netto.
J. Offshore Mech. Arct. Eng. Oct 2019, 141(5): 051601 (10 pages)
Published Online: February 15, 2019
Article history
Received:
August 18, 2017
Revised:
December 19, 2018
Citation
Teixeira, A. P., Palencia, O. G., and Guedes Soares, C. (February 15, 2019). "Reliability Analysis of Pipelines With Local Corrosion Defects Under External Pressure." ASME. J. Offshore Mech. Arct. Eng. October 2019; 141(5): 051601. https://doi.org/10.1115/1.4042384
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