Advantages and preliminary selection of low-temperature storage tanks

{1} The advantages of low-temperature storage tanks are: 1. Light weight and good strength. This type of storage tank has a density between 1.5 and 2.0, which is one-quarter to one-fifth of the density of carbon steel, but has similar tensile strength. The tensile strength of this material exceeds that of carbon steel, and its strength can be the same as that of alloy steel. It is needed in various industries, such as the aviation industry, the rocket industry, spacecraft, high-pressure vessels, and in product applications that require weight reduction. This type of storage device has good performance. 2. Low temperature storage tanks with excellent corrosion resistance (based on actual reports) are stable materials with good performance. This material has good resistance, and storage devices using this material can resist corrosion from the atmosphere, water, acid, alkali, salt, as well as various oils and solvents. This type of storage device is widely used in various aspects of chemical corrosion prevention (based on actual reports), and is replacing carbon steel storage equipment, non-ferrous metal storage equipment, and low-temperature storage tank equipment. {2} After the preliminary selection of LNG storage tank valves and the inspection of liquefied natural growth gas storage tanks, check whether the valve works normally, that is, whether the valve discharge capacity can meet the large discharge capacity of low-temperature natural growth gas storage tanks. Correctly selecting valves is a necessary condition for protecting the operation of pressure vessels. Valves are selected based on the process conditions of the container. Therefore, when selecting valves, not only should the working pressure and temperature of the pressure vessel be considered, but also the selection should be based on the characteristics of the medium. Natural growth gas storage tanks are elliptical head horizontal vessels, belonging to Class III pressure vessels. Due to the flammable and explosive nature of the liquefied petroleum gas it contains, the pressure fluctuates greatly with temperature changes, making it prone to overpressure and overload operation, resulting in serious accidents such as container rupture, fire, and explosion. So, based on the experience of stable operation of low-temperature natural growth gas storage tanks for 20 years, in addition to meticulous operation and strict management, it is also important to choose the correct accessories. There are many types of LNG low-temperature storage tank valves, including spring valves, lever valves, and impulse valves. The valve for low-temperature natural growth gas storage tanks should be of the externally mounted spring type. Spring valves are divided into two types: micro opening and full opening. Micro opening and full opening refer to the opening height of the valve disc. Spring type valves are divided into closed and non closed types. As liquefied petroleum gas is a flammable and explosive substance, it is not allowed to leak into the air. The valve is the second barrier for the operation of low-temperature natural growth gas storage tanks. In addition to selecting suitable valves according to the valve calculation method, the valve is also calibrated once a year to confirm that the discharge pressure of the valve meets the operating pressure of the low-temperature natural growth gas storage tank.