Floating Production Mooring Integrity JIP - Key Findings

Brown, Martin; Hall, Tony; Marr, D.G.; English, Michael D.; Snell, R.O.

doi:10.4043/17499-ms

Cited by 43 publications

(28 citation statements)

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“…The prototype monitoring method for investigating the operation conditions of mooring line has been presented as an important method in the study of deep water mooring systems [5,6,7,8]. As the main straightforward measurement method used today, possessing low cost and good measuring accuracy, the top tension measurement of mooring lines by utilizing load cell sensors has been widely used in existing mooring systems [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Development and Sensing Properties Study of Underwater Assembled Water Depth-Inclination Sensors for a Multi-Component Mooring System, Using a Self-Contained Technique

Jiang

Xie

et al. 2016

Sensors

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Prototype monitoring techniques play an important role in the safety guarantee of mooring systems in marine engineering. In general, the complexities of harsh ocean environmental conditions bring difficulties to the traditional monitoring methods of application, implementation and maintenance. Large amounts of existing mooring systems still lack valid monitoring strategies. In this paper, an underwater monitoring method which may be used to achieve the mechanical responses of a multi-point catenary mooring system, is present. A novel self-contained assembled water depth-inclination (D-I) sensor is designed and manufactured. Several advanced technologies, such as standalone, low power consumption and synchronism, are considered to satisfy the long-term implementation requirements with low cost during the design process. The design scheme of the water resistance barrel and installation clamp, which satisfies the diver installation, are also provided in the paper. An on-site test has previously been carried out on a production semisubmersible platform in the South China Sea. The prototype data analyses, including the D-I value in the time domain (including the data recorded during the mooring retraction and release process) and spectral characteristics, are presented to reveal the accuracy, feasibility and stability of the sensor in terms of fitting for the prototype monitoring of catenary mooring systems, especially for in-service aging platforms.

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Section: Introductionmentioning

confidence: 99%

Development and Sensing Properties Study of Underwater Assembled Water Depth-Inclination Sensors for a Multi-Component Mooring System, Using a Self-Contained Technique

Jiang

Xie

et al. 2016

Sensors

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“…Similarly, Inter-M Pulse TM is suitable for moored FPSO and mobile offshore drilling units (MODU) to provide full history data with acoustic signals (Elman et al, 2013). However, according to statistical data, 50% of the floating production storage and offloadings (FPSOs) in the North Sea cannot monitor line tension in real time, and 78% of them do not have line failure alarms (Brown et al, 2005). This paper presents a fault-tolerant control scheme based on an estimator-based supervisory control method to detect line failures with only position measurements.…”

Section: Introductionmentioning

confidence: 99%

Supervisory Control of Line Breakage for Thruster-Assisted Position Mooring System

2015

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Thruster-assisted position mooring (TAPM) is an energy-efficient and reliable stationkeeping method for deep water structures. Mooring line breakage can significantly influence the control system, and ultimately reduce the reliability and safety during operation and production. Therefore, line break detection is a crucial issue for TAPM systems. Tension measurement units are useful tools to detect line failures. However, these units increase the building cost of the system, and in a large portion of existing units in operation line tension sensors are not installed. This paper presents a fault-tolerant control scheme based on estimatorbased supervisory control methodology to detect and isolate a line failure with only position measurements. After detecting a line break, a supervisor switches automatically a new controller into the feedback loop to keep the vessel within the safety region. Numerical simulations are conducted to verify the performance of the proposed technique, for a turret-based mooring system.

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“…However, until recently data on anchor leg component performance has not been readily available to the industry as a whole. The Mooring Integrity Joint Industry Project (JIP) has allowed the collection of some data from various sources to be presented in the public domain (Brown et al, 2005, HSE Report 444, 2006. The data collected demonstrated the degradation of anchor leg components over time and provided insight into where improved design methodology and details can improve the long-term performance.…”

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confidence: 99%

Anchor Leg System Integrity - From Design Through Service Life

Duggal¹

2010

All Days

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The paper focuses on the authors' experience with the long-term performance of anchor leg components for floating production facilities. The paper shows that good long-term performance starts with design and is also influenced by the installation of the system, and in-service monitoring and maintenance programs. The paper also presents data on chain corrosion from anchor leg systems collected over the past twenty years. Guidelines based on the authors' experience for design, installation and monitoring and maintenance are also provided. IntroductionAnchor leg components are not like fine wine; they do not improve with age! Thus it is important to recognize that anchor leg components degrade with use and exposure to the environment and that this should be considered in the design, installation, inspection and maintenance of the system.The long-term, in-service performance of mooring system components is becoming increasingly important given the exponential increase in the number and complexity of floating production facilities worldwide. The trend of floating production systems being developed in deeper waters and harsher environments, coupled with longer service life requirements make incorporating the knowledge and understanding of long-term anchor leg component performance in the design and maintenance of future systems even more important. This paper provides some insight into the design and specification of anchor leg components from the fairlead to the anchor based on the authors' experience with the long-term performance of these systems.The industry has a lot of experience with the long-term performance of mooring systems due to the use of these components for permanent mooring systems for over 30 years. However, until recently data on anchor leg component performance has not been readily available to the industry as a whole. The Mooring Integrity Joint Industry Project (JIP) has allowed the collection of some data from various sources to be presented in the public domain (Brown et al., 2005, HSE Report 444, 2006. The data collected demonstrated the degradation of anchor leg components over time and provided insight into where improved design methodology and details can improve the long-term performance. The data also shows that anchor leg failures tend to occur in regions of highly dynamic behavior, i.e., at or near the fairlead, at the interfaces with other components (mooring support buoys, subsea connectors), and the touch down area. The data also shows that connector design, especially devices to prevent rotation or disassembly, is not robust enough in many cases to provide the desired longterm performance. It is important to note that the majority of permanent mooring systems have performed well and have good long-term performance of the anchor leg components other than expected wear and corrosion. The paper's intent is to learn from the existing systems and provide some guidance on improving long-term performance of permanent mooring systems in the future.The paper focuses on permanent mooring syst...

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Floating Production Mooring Integrity JIP - Key Findings

Cited by 43 publications

References 1 publication

Development and Sensing Properties Study of Underwater Assembled Water Depth-Inclination Sensors for a Multi-Component Mooring System, Using a Self-Contained Technique

Development and Sensing Properties Study of Underwater Assembled Water Depth-Inclination Sensors for a Multi-Component Mooring System, Using a Self-Contained Technique

Supervisory Control of Line Breakage for Thruster-Assisted Position Mooring System

Anchor Leg System Integrity - From Design Through Service Life

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