MRVタイプLNGC球形タンクの温度分布及び熱応力について

概要

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Cargo tanks of liquefied gas carriers such as LNGC have to be cooled down prior to cargo loading in order to avoid the excessive thermal stress in the tank due to rapid temperature change. The procedures of cool-down of tank are preferable to perform in a short time and with a minimum amount of LNG from the economical view point. In the light of the above, the authors performed theoretical and experimental analyses of cool-down using a 9% Ni steel model tank 3.3m in diameter which has a similar construction to the actual tank of MRV type LNGC. Through the analyses the methods to calculate the temperature variation and temperature/thermal stress distribution together with some empirical coefficients have been evaluated. The calculation methods and the coefficients thus obtained were then examined comparing with cool-down data of actual ships. It was confirmed that temperature variation of tank system and temperature/thermal stress distribution in the vicinity of equator and skirt could be predicted with a high degree of accuracy. In addition, the cargo tank cool-down procedures examined to establish the actual ship design from the model test data.
社団法人日本船舶海洋工学会の論文
1982-03-03