Maintenance methods for low-temperature storage tanks and analysis of specific causes of corrosion

[1] 1. Maintenance method for low-temperature storage tanks: Before use, a small amount of liquid nitrogen should be added to the tank to pre cool it. When the temperature inside the tank reaches the liquid nitrogen temperature, the tank should be filled with liquid nitrogen. Be careful to handle the liquid nitrogen tank gently to prevent collision and compression. Do not drag or move it on the ground, and lift it up. When not in use, the liquid nitrogen tank should be stored in a dry and well ventilated room to prevent moisture. 2. Always check the neck plug and neck plug groove, remove the ice on the neck plug in a timely manner, and do not place plastic cloth or other substances on the neck plug to increase its sealing ability and protect the functionality of the liquid nitrogen tank. When the consumption rate of liquid nitrogen is too fast or there are water droplets or white frost near the neck of the liquid nitrogen tank, it indicates that the insulation function of the tank is malfunctioning and liquid nitrogen cannot be retained. The specimens placed in the liquid nitrogen tank should be properly labeled, and the retrieval and placement should be stable, accurate, and fast. 3. In order to prevent erosion of the tank wall, the inner cavity of the liquid nitrogen tank needs to be cleaned once a year. Additionally, it is important to minimize transportation of low-temperature storage tanks and reduce the number of times liquid nitrogen tanks are opened. If transportation is required, it is necessary to fix the liquid nitrogen tank on the carriage with a rope and keep it upright. Prevent falling, overturning, and lying down, and try to avoid severe vibrations as much as possible. [2] Analysis of the specific causes of corrosion in liquefied gas storage tanks. If you encounter corrosion during the use of natural growth gas storage tanks, it must be taken seriously because its corrosion can have a significant impact on your normal work if not well resolved. Therefore, we hope that everyone can take it seriously. So what are the reasons for the corrosion of liquefied gas storage tanks? Liquefied gas storage tanks do not require frequent cleaning, and sediment in the water can be discharged by regularly opening the drain valve at the bottom of the tank. But we will find that there is corrosion in the liquefied gas storage tank. What's going on? Let's take a look together below. ① Gap corrosion or oxygen accumulation cell corrosion is the corrosion that occurs when some precipitation or attachment occurs on the metal surface. ② A stone may clog the tube of the corroded copper alloy condenser. At this point, turbulence will immediately occur in the downstream direction of the stone. This will lead to corrosion or wear of the copper protective oxide film and expose unprotected copper alloy metal, resulting in further corrosion. ③ Pitting corrosion is usually caused by defects on the metal surface. Repeat the reaction at an appropriate rate to produce metal perforation phenomenon. ④ Electrochemical corrosion occurs when two or more different metals come into contact and connect in the presence of a conductive liquid electrolyte.