Abstract
Methods of simulating offshore construction project activities and associated weather-related downtime are reviewed. Specific attention is given to the use of network modeling techniques to determine probable durations and risk levels for complex marine projects such as the installation of the first guyed tower production platform, and offshore mating of HIDECK, a barge-mounted integrated oil production facility with a preinstalled platform. Monte Carlo simulation techniques are used to select random variables. The environmental data derived from a spectral ocean wave model are used, while full account is taken of hydrodynamic response of the offshore systems in order to establish the limiting sea states for performing specific construction operations. Environmental data sources for such simulations are reviewed. Various methods used to determine limiting sea states are compared. The results of statistical analysis of offshore construction operations, such as module lifting, pipelaying, and saturation diving, are presented to give insight into the limitations on vessel motions during offshore construction. In summary, this paper provides a review of methodologies and data used in performing operability analyses, in order to assist engineers in assessing duration and risk for offshore construction projects.
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