APPARATUS FOR KEEPING PRESSURE OF STORAGE TANK, AND SYSTEM FOR PROVIDING LIQUIFIED GAS

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Disclosed are an apparatus for maintaining pressure of a storage tank, and a liquefied gas supply system. According to an embodiment of the present invention, the apparatus for maintaining pressure of a storage tank comprises : a pressure measurement unit for measuring pressure in a storage tank; an adjustment valve provided between a compression unit for compressing evaporation gas stored in the storage tank and a recondensing unit for recondensing the evaporation gas compressed by the compression unit by using liquefied gas stored in the storage tank so as to adjust an amount of the evaporation gas supplied to the recondensing unit; and a condensation amount control unit for controlling the adjustment valve to adjust a condensation amount of the evaporation gas processed in the recondensing unit, on the basis of a difference between a predetermined pressure value and pressure in the storage tank, measured by the pressure measurement unit, and performing condensation amount adjustment within a range not exceeding a critical throughput obtained by subtracting an amount of the evaporation gas supplied to a source of demand through the compression unit, from a maximum evaporation gas processing capacity that can be processed in the compression unit.COPYRIGHT KIPO 2018