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오병택(Byung-Taek OH),임기호(Ki-Ho YIM) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
LNG storage tanks are classified into two types, an above-ground type and an in-ground type in accordance with whether the location of inner storage space is higher than the surface of the earth or not. It is very important to keep the frozen part around an in-ground type tank maintained soundly in operating the tank during its whole life. And it’s for preventing underground water from permeating through the outside concrete wall. On the other hand, the growth of the frozen part should be controlled by the bottom and side heater which installed at the bottom of tank and the side soil respectively. They are operated by the liquid-circulated pipes or the electrical heat-tracing cables to control the thickness of the frozen part within a designed value..But these heating equipments might stop working because of the long-time operation. To prepare for the situation like this, the bottom heater was installed with a spare one from the beginning of construction, whereas the side heater was not. Therefore, the additional installation or the alternative operation technique of the side heater should be considered.