LNG Low-Temperature Storage Tank Detailed Description:

The LNG storage tank is composed of a horizontal double-walled structure, including an inner tank, an outer tank, internal and external supports, an insulating layer, a pressure safety system, a vacuum pump, and a piping system. All vacuum-insulated structures rely on vacuum. Due to the high degassing rate and suction resistance of the insulating space material, and the low roasting temperature of the sealing material to prevent slow degassing, suction can be challenging. To achieve the required vacuum level within the designed suction time, in addition to the vacuum pump and suction process, it also depends on the flow area of the annular suction pipes. To ensure a high vacuum level and improve the suction rate, a vacuum pump is installed at both ends of the equipment. One vacuum pump consists of three suction pipes, placed in the lower annular space and leading out from the bottom. The other vacuum pump, also with three suction pipes, is placed in the upper annular space and leads out from the top, with the two groups of suction pipes intersecting and overlapping along the tank length. By increasing the flow area of the suction pipes and using auxiliary methods such as heating and nitrogen displacement, the vacuum achievement time for the annular insulating space with a volume of 100 m³ is reduced to one-third of the conventional structure.

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