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Several problems that LNG storage tanks have to say
Date: Nov 19, 2019
The material of the lng storage tank is very important for the storage tank. At present, with the shortage of energy, energy structure adjustment and environmental protection pressure, the demand for natural gas is gradually increasing, and the inner tank material of LNG storage tank is getting more and more attention.
The selection of low temperature materials for large LNG cryogenic storage tanks is one of the key technologies for its design and manufacture. Since the operating temperature of the LNG storage tank is -163 ° C, it is required that the inner tank material not only has the necessary strength index, but also ensures plasticity, toughness, good formability and weldability, and the price is relatively low. At present, the most commonly used is 9Ni steel, also known as Ni9 steel, which is an ultra-low temperature steel with a nickel content (mass fraction) of 8.5% to 9.5%.
The quality of the inner tank of the lng tank must be paid attention to. This is not only the need to store the transportation gas, but also the necessary work to protect the life and property of the user. Everyone should know that lng storage tanks store some flammable and explosive dangerous gases, so the safety requirements are very high. The dangers of these dangerous storage devices are always there, and the same is true for other related equipments. So how should we reduce its risk?
First, the outer casing of the LNG tank is made of stainless steel, because the stainless steel outer tank can temporarily hold the leakage of LNG liquid, the fire resistance is higher than ordinary carbon steel, and the impact resistance and collision resistance are strong, and the corrosion resistance is good.
Secondly, the joints, valve parts and gasifiers of the LNG tank should be placed in a cold box with excellent air tightness, so as to contain the leaked LNG, prevent the flammable gas from diffusing and narrow the dangerous area. Finally, an integrated design scheme is adopted to integrally design and manufacture LNG storage tanks, cold boxes, heat exchangers, machine bases, and water curtain protection pipelines to form a “supply unit”, which is conducive to overall risk control and product approval.
The selection of low temperature materials for large LNG cryogenic storage tanks is one of the key technologies for its design and manufacture. Since the operating temperature of the LNG storage tank is -163 ° C, it is required that the inner tank material not only has the necessary strength index, but also ensures plasticity, toughness, good formability and weldability, and the price is relatively low. At present, the most commonly used is 9Ni steel, also known as Ni9 steel, which is an ultra-low temperature steel with a nickel content (mass fraction) of 8.5% to 9.5%.
The quality of the inner tank of the lng tank must be paid attention to. This is not only the need to store the transportation gas, but also the necessary work to protect the life and property of the user. Everyone should know that lng storage tanks store some flammable and explosive dangerous gases, so the safety requirements are very high. The dangers of these dangerous storage devices are always there, and the same is true for other related equipments. So how should we reduce its risk?
Secondly, the joints, valve parts and gasifiers of the LNG tank should be placed in a cold box with excellent air tightness, so as to contain the leaked LNG, prevent the flammable gas from diffusing and narrow the dangerous area. Finally, an integrated design scheme is adopted to integrally design and manufacture LNG storage tanks, cold boxes, heat exchangers, machine bases, and water curtain protection pipelines to form a “supply unit”, which is conducive to overall risk control and product approval.
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