Prediction of LNG Tank Roll-Over (eBook)

Published Date

January 1982

Prediction of LNG Tank Roll-Over (eBook)

(Excludes any applicable taxes)

This paper describes a study to develop a dynamic model of the rollover phenomenon that can predict the effect of various preventive measures on the temporal change of the boiloff rate. (14pp)

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When the density of "LNG cargo" is different from that of "heel", it had been known that the possibility of "rollover" exists. Once "rollover" occurs, it suddenly releases a large quantity of LUG vapour. This may pose an obvious safety problem in handling LNG storage tank. There exist various simulation methods, proposed an accurate analysis of the "rollover" phenomenon. In short, these prediction methods have been based on a model which has the following characteristics:
(l) The LNG liquid in the tank can be divided into a number of connective layers, each separated by a sharp diffusive interface.
(2) The heat and mass transfer across these sharp density interfaces along with the heat leak from the surroundings cause the merging among these eonvective layers.
(3) The "rollover" is regarded as the process in which a complete mixing of these layers, accompanied by a release of heat energy accumurated in the fluid, occurs.

The purpose of this study is to develop the dynamic model of the rollover phenomenon which can predict the effect of various preventive measures on the temporal change of the boiloff rate, especially peak boiloff rate. Rollover can be prevented by the mixing which bring a uniform density profile in the LNG storage tank. Therefore the simulation model of rollover presented here is developed based on the following characteristics:
(l) The continuous density profile was obtained experimentally and analytically when the liquid was transfered into a tank partially filled with a liquid of a different density. The experiments were conducted in a small tank using salt water.
(2) The sizes, the number and the growing velocities of the cellular convections were obtained

Paper delivered by:
S Takao
D Suzuki
(both of Nippon Kokan KK,Japan)

Prepared for:
Gastech Paris 1982

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

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Title: Prediction of LNG Tank Roll-Over (eBook)
Product Code: 4433g179
Published Date: January 1982

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