Collapse Capacity of UOE Deepwater Linepipe

Aamlid, Olav; Collberg, Leif; Slater, Simon

doi:10.1115/omae2011-49570

Cited by 3 publications

(2 citation statements)

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“…heat treatment or compression can be documented. A significant amount of work has been performed investigating increased fabrication factors for UOE pipe [7], [8], however it is not the intent of this paper to discuss this any further. The ovality factor 0 F (10) differs from (5) because it takes into account the nominal diameter instead of the term .…”

Section: Current Industry Determination Of Collapse Resistancementioning

confidence: 95%

Hydrostatic Collapse Of Deepwater Pipelines, A Rigorous Analytical Approach

Guarrancino¹,

Fraldi²,

Freeman

et al. 2011

All Days

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The demand for pipe materials that can withstand increasing hydrostatic pressures continues to grow as oil and gas exploration takes us into deeper and deeper waters. As water depth increases, failure by hydrostatic collapse becomes more likelyas the limiting failure mode for pipeline design. In general, pipes for deepwater applications possess a diameter to thickness ratio in a region where failure is dominated by both instability and plastic collapse. This implies that, prior to failure, the compressive yield strength of the material must be exceeded, followed by ovalisation and further local yielding.To enable effective design work to be performed, and proven during service, it is necessary to ensure that the mechanical and dimensional properties of the pipe material are controlled within very strict boundaries and reliable and accurate formulae are required to take into account these factors. However, mechanical equations for this simple failure mode have not been satisfactory established. Current existing formulations use basic mechanical expressions that are calibrated to some limited test data. However none of these expressions examine the actual mechanics of the failure mechanism. This paper presents an investigation into the mechanics of this specific problem and permits a simple assessment of the effects of geometrical and material data on the collapse pressure of moderately thick tubes. An analytical expression has been generated and correlated to extensive test data and finite element models, proving the accuracy of the expression. The resulting formula also allows a deeper understanding of the effect pipe shape has on collapse and opens to the door for manufacturers to further enhance pipe material performance. Despite the complexity of the collapse mechanisms this work presents a concise yet rigorous and effective analytical approach.The work presented in this paper will form the basis of future investigations that will enhance the understanding of this failure mode in pipelines. This will lead to increased pipeline safety while allowing the boundaries of pipeline application to be challenged, enabling hydrocarbon recovery in deeper and deeper waters.

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Section: Current Industry Determination Of Collapse Resistancementioning

confidence: 95%

Hydrostatic Collapse Of Deepwater Pipelines, A Rigorous Analytical Approach

Guarrancino¹,

Fraldi²,

Freeman

et al. 2011

All Days

Self Cite

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“…Comprehensive research has been performed by line pipe manufacturers to reduce or fully remove the negative effects of the pipe forming (for an overview see Aamlid et al 13 ). Note that DNV-OS-F101 introduced the following clause in the 2000 edition: ‘The fabrication factor may be improved through heat treatment’, and added in 2007, ‘or external cold sizing (compression), if documented’.…”

Section: Trends and Potential Solutionsmentioning

confidence: 99%

Deepwater pipelines – status, challenges and future trends

Fyrileiv

Aamlid

Venas

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part M:

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The demand for energy is steadily increasing and, at least for the coming decades, the world has to rely on oil and gas to address this need. Most of the easiest accessible offshore petroleum reservoirs have been discovered and a great part developed over the last six decades. Thus, development of new oil and gas fields faces a lot of challenges as most of them are in remote areas, in deep waters and/or in areas with extreme environments like the Arctic region. One of the major trends in the offshore petroleum industry points towards deeper waters (e.g. outside West Africa, the Brazilian Pre-Salt developments and in the Gulf of Mexico). This trend also includes increased use of subsea installations instead of platforms, more subsea processing and increased use of pipelines to transport the hydrocarbons to shore or into a pipeline grid. This paper addresses some of the challenges pipeline design, installation and operation may face in deep and ultra-deep waters. The main design challenge is related to the high external pressure that may cause collapse of the pipeline. This potential failure mode is normally dealt with by increasing the pipe wall thickness, but at ultra-deep water depths this may require a very thick walled pipe that becomes very costly, difficult to manufacture and hard to install due to its weight. One approach to overcome this is to improve some of the parameters that determine the collapse resistance by an improved manufacturing process. Other approaches are to ensure a minimum internal pressure is maintained in the pipeline during all phases, or to install a buoyant pipeline that is anchored at a moderate water depth rather that laying on the sea bed.

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State of the Art Pipeline Engineering Adopted for the BM-C-33 Offshore Export Pipeline

Nystrøm,

Kristiansen,

Gilbu

et al. 2023

Day 1 Tue, October 24, 2023

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The BM-C-33 gas export pipeline, with its dimension of 22/24″OD, is one of the deepest large-OD pipelines under development. The pipeline design at such water depth is pushing the boundaries of current design codes, line pipe manufacturing capabilities and available installation vessels in the market. The purpose of this paper is to mainly focus on the key challenges and opportunities related to design, installation, and commissioning of the ultra-deep section of the BM-C-33 gas export pipeline route. Furthermore, it will outline associated mitigations that will be captured in the project development and execution phases. Key challenges to be discussed in this paper are related to the ultra-deep end of the pipeline route includes high installation loads; wall thickness design considerations for high external pressure; large and complex pre-commissioning scope involving exploring using the REPLACE JIP methodology; PLEM design considerations; free span and thermal buckling mitigation strategies and route challenges.

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Collapse Capacity of UOE Deepwater Linepipe

Cited by 3 publications

References 0 publications

Hydrostatic Collapse Of Deepwater Pipelines, A Rigorous Analytical Approach

Hydrostatic Collapse Of Deepwater Pipelines, A Rigorous Analytical Approach

Deepwater pipelines – status, challenges and future trends

State of the Art Pipeline Engineering Adopted for the BM-C-33 Offshore Export Pipeline

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