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Title: Buckle initiation and propagation in subsea pipelines
Author: Tam, Christophe Kwok Wah
ISNI:       0000 0001 3496 8800
Awarding Body: University of London
Current Institution: University College London (University of London)
Date of Award: 1999
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Increasing demand for oil and gas recovery from deeper and more hostile waters imposes new demands upon engineers in assessing failure potentials of subsea pipelines. The phenomena of collapse, buckle initiation and propagation have received much attention in the last 2 decades. This thesis presents the results of an investigation to enhance the understanding of the mechanics of behaviour of buckle initiation and propagation. It also briefly addresses other related issues such as impact damage of tubulars and pressure collapse of deep-water pipelines. Furthermore, a novel pipe wall geometry involving the use of external, integral, spirally wound, reinforcing ribs to enhance collapse and buckling capacities is described. The thesis is organised into 8 sections, with Sections 1 and 8 being the Introduction and Conclusions respectively, and Sections 2 to 7 address the following issues: Local damage of circular tubulars; Buckle initiation of damaged subsea pipelines; Buckle propagation of subsea pipelines; Improvement of buckle propagation performance through the use of spirally wound ribs; Collapse of deep-water pipelines under combined bending and external pressure; Limit State Design of deep-water pipelines. For the investigation of local damage, buckle initiation and propagation, new plastic mechanism analysis procedures have been developed. Where appropriate, the effects of strain hardening, interaction between membrane and bending plasticity, etc. are taken into account in the analysis procedures developed. Theoretical predictions compare well with existing test results providing confidence in the methods being used for design. Buckle initiation during pipelay may be viewed as collapse due to combined bending and external pressure loading. A deterministic procedure, based upon finite element modelling and full-scale test correlation, for thick walled pipes with diameter to thickness ratios less than 20, is described. As part of the concluding remarks, a discussion of the development in limit state design methods for deep-water pipelines is included at the end of this thesis.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Pumps & filters & pipes & tubing & valves