Lifetime Extension North Sea FPSO, Mooring System Replacement; Integrity and Design Challenges

Leeuwenburgh, Richard; Brinkhuis, Hubert T

doi:10.4043/25232-ms

Cited by 3 publications

(2 citation statements)

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“…More severe failures necessitate longer repair times. In practical engineering, the installation and replacement of mooring lines demand a limit on the floater's horizontal offset to stabilize it at the center of the intact mooring system 46,60 . The offset of floater and mooring line tension are positively correlated.…”

Section: Mooring System Resilience Assessment Methodsmentioning

confidence: 99%

“…In practical engineering, the installation and replacement of mooring lines demand a limit on the floater's horizontal offset to stabilize it at the center of the intact mooring system. 46,60 The offset of floater and mooring line tension are positively correlated. Consequently, when the mooring lines partially fail, a greater floater offset results in higher tension in the remaining mooring lines and increases the time needed to return to a neutral position.…”

Section: Modeling Of the Recovery Timementioning

confidence: 99%

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Reliability‐based resilience assessment method for mooring systems under mooring failure

Yu,

Zhang,

Zhang

et al. 2024

Earthquake Engineering and Resilience

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Offshore floating structures rely heavily on their mooring systems, which can be disrupted by various events during long‐term operation. These could lead to a mooring failure, affecting the usual operations of the structure or even causing more severe hazards. Resilience provides a comprehensive evaluation of how the mooring system performs after a disaster, which is key to optimizing the structural design and operational safety. In this paper, we develop a general and user‐friendly method to quantitatively assess the resilience of mooring systems under mooring failure. We use the reliability index to represent the performance of the mooring system. We then derive its RV, ACI, and RCI, which are based on a system performance curve and reliability analysis. We also consider the effects of climate change and the corrosion of the mooring chain. These factors can significantly affect environmental loads, structural performance, and the recovery process. Moreover, an illustrative example is provided that guides us through the methodology. The proposed method is applied to assess the resilience of a certain mooring system in the South China Sea over a 30‐year service life under different failure scenarios. Our results indicate that overlooking climate change in the design and operation of the mooring system can lead to a significant overestimation of its reliability index and resilience value.

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Section: Mooring System Resilience Assessment Methodsmentioning

confidence: 99%

Section: Modeling Of the Recovery Timementioning

confidence: 99%

Reliability‐based resilience assessment method for mooring systems under mooring failure

Yu,

Zhang,

Zhang

et al. 2024

Earthquake Engineering and Resilience

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Deepwater Facility Integrity Management: A State-of-the-Art Review

Allen

2015

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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The offshore oil and gas industry recognizes and agrees that there are too many instances of premature failures leading to loss of life, environmental impacts, reputation damage, increased downtime, and production losses. In response to this situation, there has been rapid growth in integrity management related research and development, however it has become difficult to keep track of all of this activity. The purpose of this state-of-the-art review paper is to summarize key findings and provide a comprehensive list of pertinent literature in the field of deepwater facilities integrity management. Focus is given to the latest information on integrity management systems, regulations, standards and recommend practices, and current industry challenges. The goal of this paper is to consolidate and provide the most updated information regarding integrity management, in order to assist those individuals and companies that are new to this field. Several of the referenced documents are available to the public via the World Wide Web. The references are provided for information only, and do not represent a comprehensive list of applicable standards, recommend practices, or regulations.

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Integrity Management of Mooring Systems

Hageman¹,

Aalberts²,

Leeuwenburgh³

et al. 2019

Day 1 Mon, May 06, 2019

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Mooring systems remain an important component of an overall field development. There are numerous sources in literature describing challenges with mooring systems as well as potential solutions. The goal of this paper is to present a number of new technologies which can be applied jointly in an integrated framework to monitor integrity of subsea mooring components. The paper will cover (1) direct tension measurements using Vibrating Wire Gauges, (2) warning systems based on anomaly detections from GPS measurements and (3) mooring line force estimation method and fatigue using time-domain simulation methods. Vibrating Wire Gauges are a potential alternative to the use of in-line load cells or inclinometers for measuring mooring line tensions. These sensors have a proven track record in the Geotechnical Industry. A sensor dedicated for the offshore industry has been developed. The main benefit of this type of sensor is the ease of retrofitting in an offshore environment. Long-term stability tests and dynamic tests were executed and will be presented. Procedures for installation and maintenance were developed. GPS measurements have widely been used in the industry to identify mooring failures. Post-processing methods of these measurements range from application of watch circles to Artificial Neural Networks. However, there remain important challenges with performance of these warning systems under the influence of environmental loads. The authors will show a basic concept which can overcome these limitations. High accuracy floater position and motion measurements can be used in combination with a numerical model to determine mooring line forces in the field. This approach combines the numerical models used in the design with onboard integrity and maintenance procedures. The technical and organisational challenges of such approach are discussed. An onboard system able to capture system drift is used to update the numerical model and correct for deterioration of the mooring system over time. In-service measurements have been used to demonstrate and validate the concept. The methodology has been implemented and installed on an offshore asset which will become active in Q1 2019. A number of industry solutions for mooring line integrity methods have been compared. All presented solutions have a role in the total mooring subsea integrity management program. Integration of these components together or supplemented with numerical analysis can be used to develop an overall mooring subsea integrity management plan and philosophy.

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Lifetime Extension North Sea FPSO, Mooring System Replacement; Integrity and Design Challenges

Cited by 3 publications

References 0 publications

Reliability‐based resilience assessment method for mooring systems under mooring failure

Reliability‐based resilience assessment method for mooring systems under mooring failure

Deepwater Facility Integrity Management: A State-of-the-Art Review

Integrity Management of Mooring Systems

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