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- W4297883489 abstract "The shut-down and unmanning procedure shall be implemented to ensure that the structural reliability of the facility with personnel on-board are not less than for permanently manned platforms. A permanently manned installation shall withstand the abnormal metocean actions (ALS) with an annual probability of exceedance equal to 10−4. According to NORSOK N-006 it can be assumed that the same safety level is achieved by unmanning the installation for a metocean action of 5 x 10−4 exceedance probability per year. NORSOK also recommends to have a criterium related to the probability of exceeding the structural capacity in the forecasted extreme storm. Further, NORSOK N-006 requires that the uncertainty and/or bias in weather forecasts shall be accounted for. A consistent way of estimating the extreme response is by utilizing a long-term analysis. Two long term approaches will be considered in this paper: all sea states approach and random storm approach. Unmanning criteria according to N-006 will be established for both methods. The example case is unmanning due to possible wave-in-deck impact of a jacket structure in water depth of 110m. The paper will discuss unmanning by considering the annual target constraint and by considering constraint in terms of forecasted storm event. Further, the effect of forecasted uncertainty will be discussed." @default.
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- W4297883489 date "2022-10-01" @default.
- W4297883489 modified "2023-10-18" @default.
- W4297883489 title "Establishing Unmanning Criteria for a Jacket Structure on the NCS" @default.
- W4297883489 doi "https://doi.org/10.1115/1.885789_ch14" @default.
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