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• W1977688105 abstract "ABSTRACT In this work, three companies undertook analyses of a given tension leg platform (TLP) configuration to predict maximum and minimum tendon tensions in an extreme design storm in the Gulf of Mexico. Each participant used its own analytical methods and experience to analyze the subject TLP. The results of this exercise are presented along with a discussion of the different analytical methods used to arrive at the results. The variability in the results can be attributed to a variety of reasons which can be divided into three general categories: items for which Widely accepted analytical procedures were used by all participants, items for which a combination of analytical and empirical evidence was used, and items for which the participants relied on empirical evidence, past experience and engineering judgement. In general, the magnitude of the variability in the results increased from the first to the third category. The study also pointed out the relative importance of the various contributions to the tendon tension predictions. In some instances, items with a great deal of uncertainty in their estimated effect turned out to have minimal impact on the final result. The results of this study give some indication of the variability and uncertainty in the available analytical methods which may be useful for the calibration of reliability based design codes. INTRODUCTION In the design of a tension leg platform (TLP) the prediction of the extreme maximum and minimum tendon tensions is of the utmost importance. The tendons must be large enough to withstand the most extreme maximum tension and the amount of pretension (or excess of displacement over weight) of the TLP must be large enough that the tendons do not go slack. Since the cost of a TLP is quite sensitive to hull and tendon size (and hence pretension levels as well as maximum tension levels) it is important to accurately predict the tensions. The results presented in this paper arise from a study conducted by three major oil companies in the context of preparation for a possible joint venture involving a deep water TLP. To come to a better understanding of the companies' analytical methods and design practices, a small study was conducted whereby each participant was provided with the particulars of the same TLP subjected to the same environmental conditions and given the task of predicting maximum and minimum tendon tensions. The immediate purpose of this exercise was to identify areas in which the participants agreed and disagreed on analytical methods and the selection of design values. However, the results are somewhat more far-reaching when viewed from the point of view of an outside observer interested in TLP design. The study provides three stateof- the-art, or perhaps more accurately, state-of-practice, analyses by three different organizations, all well versed in the specific problems of TLP design. Each participant followed rational and Widely accepted design and analysis practices." @default.
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• W1977688105 date "1992-05-04" @default.
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• W1977688105 title "A Comparison of Methods for Predicting Extreme TLP Tendon Tensions" @default.
• W1977688105 doi "https://doi.org/10.4043/6887-ms" @default.
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