Cryogenic lng storage tank introduction
Liquid natural gas must be stored in cryogenic tanks, which usually consist of an inner tank and an outer tank filled with insulation.
Liquid natural gas must be stored in cryogenic tanks, which usually consist of an inner tank and an outer tank filled with insulation.
The inner tank, also known as the “film tank”, is made of thin cryogenic steel plate with liquid-tight, flexible inner container. The inner tank and its piping are made of stainless steel S30408, which must pass the hydraulic head to the insulation.
Insulation layer in the hydraulic head to the outer tank at the same time, but also play a role in reducing the amount of gasification, reduce the temperature difference between the inner and outer walls of the tank, reduce the resulting temperature difference between the role of stress, in addition to it has a fixed “film” function. Therefore, the thermal conductivity of the insulation layer is small, and has sufficient strength.
After the LNG is injected into the tank, the inner tank wall will shrink; conversely, after the LNG is completely discharged, the temperature inside the tank will gradually rise and the inner tank wall will stretch. The powdered insulation material filled in the middle of the inner and outer tanks becomes tight due to the repeated expansion and contraction of the inner tank wall. Therefore, near the inner tank must be laid a layer of strong expansion and contraction of the insulation layer, the thickness of this insulation layer with the expansion and contraction of the inner wall of the tank to adapt to, and in the expansion and contraction of the inner wall of the tank to play a buffer role, to ensure the safe operation of the storage tank.
Outer tank is able to withstand a variety of load shell, it must have sufficient strength. The material used for the shell with alloy steel Q245R manufacturing
