Sustainable recycling of mooring ropes from decommissioned offshore platforms

Sudaia, David Pascoal; Bastos, Milton Briguet; Fernandes, Elieti Biques; Nascimento, Christine Rabello; Pacheco, Élen Beatriz Acordi Vasques; Silva, Ana Lúcia Nazareth da

doi:10.1016/j.marpolbul.2018.06.066

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…With the increasing number of offshore wind installations, more and more waste materials are produced (Liu and Barlow 2017;Sudaia et al 2018;Jensen 2019). Many regulations across several regions prohibit the disposal of wastes in the sea and require adequate sustainable practices for disposal onshore.…”

Section: Waste Managementmentioning

confidence: 99%

An economic assessment framework for decommissioning of offshore wind farms using a cost breakdown structure

Adedipe

Shafiee

2021

Int J Life Cycle Assess

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Purpose As wind power generation increases globally, there will be a substantial number of wind turbines that need to be decommissioned in the coming years. It is crucial for wind farm developers to design safe and cost-effective decommissioning plans and procedures for assets before they reach the end of their useful life. Adequate financial provisions for decommissioning operations are essential, not only for wind farm owners but also for national governments. Economic analysis approaches and cost estimation models therefore need to be accurate and computationally efficient. Thus, this paper aims to develop an economic assessment framework for decommissioning of offshore wind farms using a cost breakdown structure (CBS) approach. Methods In the development of the models, all the cost elements and their key influencing factors are identified from literature and expert interviews. Similar activities within the decommissioning process are aggregated to form four cost groups including: planning and regulatory approval, execution, logistics and waste management, and post-decommissioning. Some mathematical models are proposed to estimate the costs associated with decommissioning activities as well as to identify the most critical cost drivers in each activity group. The proposed models incorporate all cost parameters involved in each decommissioning phase for more robust cost assessment. Results and discussion A case study of a 500 MW baseline offshore wind farm is proposed to illustrate the models’ applicability. The results show that the removal of wind turbines and foundation structures is the most costly and lengthy stage of the decommissioning process due to many requirements involved in carrying out the operations. Although inherent uncertainties are taken into account, cost estimates can be easily updated when new information becomes available. Additionally, further decommissioning cost elements can be captured allowing for sensitivity analysis to be easily performed. Conclusions Using the CBS approach, cost drivers can be clearly identified, revealing critical areas that require attention for each unique offshore wind decommissioning project. The CBS approach promotes adequate management and optimisation of identified key cost drivers, which will enable all stakeholders involved in offshore wind farm decommissioning projects to achieve cost reduction and optimal schedule, especially for safety-critical tasks.

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Section: Waste Managementmentioning

confidence: 99%

An economic assessment framework for decommissioning of offshore wind farms using a cost breakdown structure

Adedipe

Shafiee

2021

Int J Life Cycle Assess

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“…It has been shown that the elastic synthetic rope has great potential in the application of wave energy converter (WEC) mooring system [2]. Moreover, the decommissioning process and reusement possibilities of synthetic ropes are being studied since this provides an opportunity for financial, environmental, and socioeconomic benefits [3,4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling for Synthetic Fibre Mooring Lines Taking Elongation and Contraction into Account

Ćatipović

Alujević

Rudan

et al. 2021

JMSE

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Synthetic fibre mooring lines are used as an alternative to traditional steel wire ropes due to their higher strength to weight ratio. Benefits are also found in relative ease of handling, and therefore the marine industry has largely accepted this type of mooring line. By rules and regulations, the design of mooring lines should be based on a coupled dynamic analysis of a particular mooring system and moored vessel. This approach incorporates damping and inertial forces (i.e., hydrodynamic reactions) acting directly on the mooring lines due to their motion through the seawater. On the basis of the outer diameter of the synthetic fibre rope, the Morison equation gives estimations of the mooring line hydrodynamic reactions. In comparison to the traditional steel wire ropes, the synthetic mooring lines usually have relatively larger elongations and consequently larger reductions of the outer diameter. Furthermore, the lower diameter certainly leads to reduced values of damping and added mass (of mooring lines) that should be considered in the coupled model. Therefore, the aim of this study was to develop a new numerical model that includes diameter changes and axial deformations when estimating the hydrodynamic reactions. The development of the model is carried out with a nonlinear finite element method for mooring lines with the assumption of large three-dimensional motions. The obtained results show the effectiveness of the newly developed model as a more accurate approach in calculation of hydrodynamic reactions.

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“…O descomissionamento dessas plataformas flutuantes gera resíduos pós-consumo, entre os quais, os cabos de poliéster usados nas linhas de amarração. Dado ao seu alto valor agregado, esses cabos não podem ser descartados como lixo [26]. Sendo assim, iniciativas que visem à reutilização do PET proveniente da desmontagem desses cabos são bastante relevantes.…”

Section: Introductionunclassified

Desenvolvimento e caracterização de concretos produzidos com substituição parcial do agregado miúdo por resíduos de cabos de plataformas de petróleo

et al. 2021

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RESUMO A incorporação de resíduos e a redução do teor de agregados minerais em formulações de concreto são ações que contribuem para a preservação ambiental. O objetivo desse estudo é desenvolver e avaliar as propriedades e a porosidade de concretos formulados com resíduos, provenientes de cabos usados em linhas de amarração de plataformas de petróleo. Com essa finalidade, os resíduos foram caracterizados utilizando técnicas tradicionalmente utilizadas em materiais. Corpos de prova de concretos de traço padrão 1,0: 2,3: 2,7: 0,55 (cimento: areia: brita: água) (NBR 5738) foram preparados e usados como referência. Para avaliar o efeito da incorporação dos resíduos no desempenho dos concretos, corpos de prova com teores de substituição parcial de 5% e 10% do agregado miúdo por resíduos foram preparados, e submetidos a ensaios de resistência à compressão axial (NBR 5739) e de absorção de água (NBR 778). A porosidade dos concretos foi determinada a partir de imagens obtidas em escâner comercial. Os resultados mostraram que os resíduos eram constituídos por poli (tereftalato de etileno), PET. O concreto formulado com teor de substituição de agregado miúdo por 5% de PET apresentou leve tendência ao aumento da resistência. A substituição de 10% do agregado por PET, entretanto, reduziu a resistência do concreto. Os valores de porosidade do concreto de referência e do formulado com substituição de 5% de agregado por PET apresentaram relação condizente com os valores de resistência à compressão. A metodologia adotada se mostrou satisfatória para a determinação de poros do tipo vazios de ar presentes na estrutura do concreto. As curvas de resistência versus porosidade baseadas nos modelos de Powers e Riyshkevitch demonstraram que essa metodologia pode ser utilizada para determinar a resistência à compressão de concretos com porosidade menor que 20%. O concreto formulado substituindo o agregado miúdo por 5% de PET apresenta resistência compatível com a do material de referência.

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Sustainable recycling of mooring ropes from decommissioned offshore platforms

Cited by 11 publications

References 19 publications

An economic assessment framework for decommissioning of offshore wind farms using a cost breakdown structure

An economic assessment framework for decommissioning of offshore wind farms using a cost breakdown structure

Numerical Modelling for Synthetic Fibre Mooring Lines Taking Elongation and Contraction into Account

Desenvolvimento e caracterização de concretos produzidos com substituição parcial do agregado miúdo por resíduos de cabos de plataformas de petróleo

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