Marine Warranty Survey for Jack‐Ups

Morandi, Alberto

doi:10.1002/9781118476406.emoe385

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…In the marine and offshore industry, the practice of marine warranty services (MWS) is viewed by industry players as a key to guaranteeing asset and operational integrity on industrial-scale projects (TÜV-Rheinland, 2013;Sackey et al, 2021). In other words, MWS surveys go to the core of insurance warranties for project cargoes and operations within the offshore industry (Sackey et al, 2021), although the scope of their operation today extends beyond the offshore and oil and gas industries.…”

Section: Introductionmentioning

confidence: 99%

An Assessment of Sociotechnical Transition in Marine Warranty Survey Practice: Case of West Africa’s Marine and Cargo Project Management Against Risk

Sackey,

Lamptey,

Afful

et al. 2023

Preprint

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As in Figure 1, the study proceeds to investigate and characterize the nature of the sociotechnical systems and transitions during operation in the maritime industry spared by the COVID-19 pandemic –comparing and examining cause and effect variables setting forth the relationship of complexity within the transition in the Gulf of Guniea area. The study also examines and contrasts best practices while drawing on the lessons learned. A case study approach was implemented where initial data gathering was achieved through a targeted survey. This was followed by a select interview to examine specific concerns arising from the survey outcome before a field observation was carried out. The study finds respondents highlighted the emerging need for green energy towards ecological sustenance as highly ranked among factors rapidly spearheading socio-technical transition in the maritime and offshore energy industry in West Africa. 67 percent also viewed the health crisis as a positive force in the sociotechnical transition in the maritime and offshore energy industry. These findings agreed with researchers who found that during the pandemic’s lockdown and restrictions, carbon emissions across the globe were reduced by 5.4 percent. Again, 87 percent found the need to be physically present on the survey site critical to safe operations and success. This notwithstanding, the period saw the introduction and scaling of remote marine surveys. Finally, 81.4 percent of respondents found the use of remote technology on the marine survey site to be essential to operations success while limiting the movement of the attending surveyor on site.

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Section: Introductionmentioning

confidence: 99%

An Assessment of Sociotechnical Transition in Marine Warranty Survey Practice: Case of West Africa’s Marine and Cargo Project Management Against Risk

Sackey,

Lamptey,

Afful

et al. 2023

Preprint

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show abstract

“…A novel methodology was proposed in [15], where the limiting sea states for pipe-laying operations were derived based on stresses developed in the pipe due to the action of wave and motion of the installation vessel. In [16], a strength-based damage criterion was used, where operational limit corresponding to allowable impact velocity was estimated for jacking up operations. Furthermore, in [17], the stresses developed in the legs of the jack-up were mapped backwards to derive allowable sea states in terms of H s and T p .…”

Section: Introductionmentioning

confidence: 99%

Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines

et al. 2019

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Installation of wind-turbine blades on monopile-type offshore wind turbines is a demanding task. Typically, a jack-up crane vessel is used, and blades are individually lifted from the vessel deck and docked with the preinstalled hub. During the process of mating, large relative motions are developed between the hub and root due to combined effects of wind-generated blade-root responses and wave-generated monopile vibrations. This can cause impact loads at the blade root and induce severe damages at the blade-root connection. Such events are highly likely to cause the failure of the mating task, while affecting the subsequent activities, and thus require competent planning. The purpose of this paper is to present a probabilistic response-based methodology for estimating the allowable sea states for planning a wind-turbine blade-mating task, considering impact risks with the hub as the hazardous event. A case study is presented where the installation system consisting of blade-lift and monopile system are modelled using multibody formulations. Time-domain analyses are carried out for various sea states, and impact velocities between root and hub are analyzed. Finally, an extreme value analysis using the Gumbel fitting of response parameters is performed and limiting sea state curves are obtained by comparing characteristic extreme responses with allowable values. It is found that the limiting sea states for blade-root mating tasks are low for aligned wind–wave conditions, and further increase with increased wind–wave misalignment. The results of the study also show that the parameter T p is essential for estimating limiting sea states given that this parameter significantly influences monopile vibrations during the blade-root mating task. Overall, the findings of the study can be used for a safer and more cost-effective mating of wind-turbine blades.

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Marine Warranty Survey for Jack‐Ups

Cited by 2 publications

References 16 publications

An Assessment of Sociotechnical Transition in Marine Warranty Survey Practice: Case of West Africa’s Marine and Cargo Project Management Against Risk

An Assessment of Sociotechnical Transition in Marine Warranty Survey Practice: Case of West Africa’s Marine and Cargo Project Management Against Risk

Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines

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