LNG (liquefied natural gas) is flammable and explosive and poses a great risk when stored. Generally, LNG storage is carried out by special storage tanks, which need to consider multiple factors such as liquid level, temperature, density and tank pressure. So, what kind of material is used for insulation of LNG storage tanks?
There are three kinds of LNG storage tanks: atmospheric storage tank, pressurized storage of child and mother tank and pressurized storage of vacuum powder tank. What type of storage is used depends mainly on the size of the storage capacity. Among them, large LNG storage tanks have a capacity of more than 40,000 cubic meters. Currently, the maximum capacity of storage tanks at domestic LNG receiving stations is 200,000 cubic meters, and 160,000 cubic meters is common. Different from pressure vessels, large LNG storage tanks are large vessels under normal pressure and low temperature. Under normal pressure, the temperature in the tank drops below -162℃, realizing the storage function of LNG and providing safe storage guarantee.
LNG storage tanks are generally insulated with foam glass bricks, expanded perlite, glass fiber elastic felt, glass wool and other materials. The LNG storage tank is better insulated with glass fiber elastic felt. LNG storage tank insulation materials need to have considerable thermal resistance and high strength. Uetersen LNG glass fiber elastic felt is made by using a special process to bond fine glass fibers together in random directions. The binder is a special thermosetting resin. Made of glass fiber felt has outstanding resilience, tensile strength and other mechanical properties. In addition to absorbing the lateral pressure of the tank's expanding perlite under various conditions, the elastic felt itself maintains its integrity.
Low thermal conductivity of Uetersen LNG glass fiber elastic felt can ensure good thermal insulation effect, energy saving and environmental protection. Moreover, the combination between the fibers is tight, the grip strength between the fibers is strong, and the tensile property is stronger. It ensures that the fiber distribution is uniform after installation and use, and there will be no local thickness and insufficient strength. At the same time, glass fiber elastic felt or A1 grade non-combustible fireproof material, greatly improve the safety performance.
If the moisture content of the material in the low-temperature storage tank is too high, the replacement gas can not dry the insulation material in time, resulting in frost of the tank, which has safety risks. The moisture content of Uetersen LNG glass fiber elastic felt is as low as 0.4%, with excellent drying effect, ensuring timely drying of cryocooling insulation system of LNG tank and stable operation of the system.