LNG Cargo Tanks. A ship motions analysis of Internal Dynamic Loading (eBook)

Published Date

January 1974

LNG Cargo Tanks. A ship motions analysis of Internal Dynamic Loading (eBook)

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This paper compares the research and results of a USCG project to the acceleration guidance rules (1974) of the classification societies(39pp)

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This paper presents the progress and results from a two year research project on LNG tank design guidelines undertaken by the Naval Ship Research and Development Center and sponsored by the US Coast Guard for assistance in its regulatory program.

Five LNG tank vessels were examined ranging in capacities from 29000 to 200 000 cu m, including spherical and membrane tank systems. Extreme accelerations and motions were developed by applying short-term statistics to hull responses predicted for severe sea conditions. Historical data from ocean areas serving LNG shipping routes provided the sea input. Design accelerations were selected from the extreme values by applying operator strategies in storms. This involves speed reduction, heading change to limit vessel motions, most likely headings, etc. The impact of the strategies chosen is measured by the exclusion of extremes from the range of accelerations that the vessel may encounter in its lifetime. The influence of ship load variation on design accelerations was also examined. The internal tank pressure was obtained by combining acceleration components and static tank positions as it is shown that the internal tank pressures due to ship motions and gravity are determined primarily by the design vertical accelerations and not by lateral or longitudinal accelerations. Comparisons were made with design vertical accelerations calculated from the June 1974 acceleration guidance rules of the International Association of Classification Societies

Paper Delivered by:
A. E. Baitis
W. G. Meyers
S. L. Bales
(all from Naval Ship Research & Development Centre)
J. R. Dwyer (U.S. Coast Guard)

Prepared for:
Gastech Amsterdam 1974

Title: LNG Cargo Tanks. A ship motions analysis of Internal Dynamic Loading (eBook)
Product Code: 4433G038
Published Date: January 1974

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