Probabilistic Analysis of Characteristic Pressure for LNG Tanks

Graczyk, Mateusz; Moan, Torgeir; Rognebakke, Olav

doi:10.1115/omae2005-67096

Cited by 6 publications

(6 citation statements)

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“…Good fit of the Weibull and generalized Pareto (GP) distribution to the samples of experimentally measured sloshing pressures was reported in Graczyk et al (2006). Below, a complementary analysis regarding estimation of the shape parameter of the GP distribution is presented.…”

Section: Statistics Of the Pressure Peak Magnitudementioning

confidence: 97%

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Extreme sloshing and whipping-induced pressures and structural response in membrane LNG tanks

Graczyk

Moan

2007

Ships and Offshore Structures

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The long-term extreme pressure in the membrane LNG tank and structural response of the Mark III containment system are addressed. The effect of hull slamming-induced vibrations on the vertical acceleration is investigated and found to be important in certain situations. Determining structural response due to sloshing requires a stepwise approach considering long-term variation of the sea state, ship motion in a stochastic seaway, fluid motion in the tanks, pressures acting on the tank structure, structural load effects, and their comparison with the appropriate resistance. This paper is focused on the determination of the critical conditions to limit the number of combinations of sea states, vessel heading, and speed that need to be considered in estimating extreme sloshing pressures. In this context, an approximate method is introduced and validated. These sea states are determined by a full linear long-term analysis. The response quantiles suitable for the contour line approach are also found using simplified criteria. The effect of avoiding heavy weather in vessel operation on sloshing and whipping-induced pressures is investigated. Sloshing experiments and various scaling approaches are described. Application of the generalized Pareto distribution and correctly determining its shape parameter is discussed. Structural response of the LNG membrane tank wall is investigated. The importance of accounting for the steel flexibility in calculating sloshing response is shown. A new method for approximating the time history of sloshing impact pressure is suggested.

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Section: Statistics Of the Pressure Peak Magnitudementioning

confidence: 97%

“…Description of sloshing-induced pressures by two statistical models was discussed in Graczyk et al (2006). Good fit of both the Weibull and generalized Pareto (GP) distribution was reported.…”

Section: Introductionmentioning

confidence: 99%

Extreme sloshing and whipping-induced pressures and structural response in membrane LNG tanks

Graczyk

Moan

2007

Ships and Offshore Structures

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“…Gran 9 carried out a statistical analysis using the results of model tests, introducing the results based on the Frechet distribution. Later, Graczyk et al 10 and Graczyk and Moan 11 published their research results adopting a systematic method for sloshing analysis, which covers a sequence of ship motion analysis, model-scale sloshing experiment, structural response of ship structure, and statistical analysis. Their studies became the basis of many researches on sloshing experiment and peak analysis.…”

Section: Introductionmentioning

confidence: 99%

Outlier analysis of sloshing impact loads on liquid ship cargo

Kim

Ahn

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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This paper introduces an outlier analysis which can improve the convergence of the statistical analysis results of sloshing model test data. The paper classify possible outliers in the sloshing model test into three categories and present a treatment method for each outlier. The developed outlier analysis is adapted to the model test results for the cargo of the liquefied-natural-gas (LNG) carrier in operation. The results of the present new method are compared with those of the conventional procedure, particularly focusing on long-term sloshing prediction. Through this study, the effectiveness of the present method is observed, and it is found that the present method provides is robust and reliable results in the application of experimental data for load prediction.

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“…Because of this reason, in the last decade, very systematic methodologies or concepts for the experimental assessment of sloshing loads have been studied [1,2], and a few large experimental facilities have been built for practical model tests. During the last 2 years, an experimental system for sloshing has been also being equipped in Seoul National University (SNU) [3].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on model-scale sloshing tests

Kim

et al. 2011

J Mar Sci Technol

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This paper considers a comparative study on model-scale sloshing tests. There are two primary scopes of this study: the comparison of sloshing pressure measured in 1/50-scale model tests at Seoul National University (SNU) with (1) the data measured at the other facility for the same model, and (2) the data measured on a smaller scale model. For the comparative study, model tanks are excited with the same irregular motions with Froude scale, and sloshing pressure signals are measured at the same locations. The statistical quantities of 1/50-scale model tests are compared with those of other facility and 1/70-scale model tests. In this study, it is found that peak pressure measured at SNU are slightly lower than those of other facility, and this difference may be due to different sensor types and sensing diameters.

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Probabilistic Analysis of Characteristic Pressure for LNG Tanks

Cited by 6 publications

References 0 publications

Extreme sloshing and whipping-induced pressures and structural response in membrane LNG tanks

Extreme sloshing and whipping-induced pressures and structural response in membrane LNG tanks

Outlier analysis of sloshing impact loads on liquid ship cargo

Comparative study on model-scale sloshing tests

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