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Most probable maximum responses of mooring lines in offshore floating facilities under extreme environmental conditions
Mooring systems of permanently moored floating offshore facilities need to be able to withstand extreme weather conditions. There are a few published methodologies for estimating the relationship for the statistical distribution of vessel offsets and resulting mooring responses during a storm. The general applicability of these estimates for very large offshore floating systems such as FLNG still needs to be demonstrated.
The main objective of this PhD thesis is to better understand the mooring system responses of an offshore floating system. Current industry practice in obtaining the most probable extreme response, involves a large amount of simulations and calculation time. In this research it is aimed to develop a robust and reliable method of obtaining the above described, most probable maximum responses, with minimal computational efforts. Once the method is validated, it will be used to tackle other engineering aspects of mooring system design that require further research.
In the last three decades there have been an increasing trends in using large floating offshore platforms around the world, including the Australian waters. Mooring lines are one of the most important structural components of permanently moored offshore facilities. A failure of mooring line can cause loss of production and a series of possible catastrophic events with substantial environmental, financial and reputational damages. As a result, there is an increasing demand from the industry to better understand the maximum mooring line responses as well as other aspects in mooring system design.
This research aims on developing a robust method of obtaining most probable maximum responses with much shorter computational efforts when compared to current industry practice. This method will then be used to better understand other aspects of mooring design, allowing the industry to enhance the overall safety of large offshore facilities in general.