The safety issue of low-temperature storage tanks and laser non-destructive testing

{1} The safety issue of liquid ammonia storage tanks and the problem of corrosion of low-temperature storage tanks are receiving increasing attention. Many safety issues are caused by the insufficient corrosion resistance of liquid ammonia storage tanks (mainly based on actual reports). Generally, the weld area inside the tank is relatively serious. What are the uses and methods of liquid ammonia storage tanks that have emerged so far? Liquid ammonia tank manufacturers will explain to you that liquid ammonia storage tanks are a type of pressure storage tank that is more suitable for industries such as petroleum, chemical, grain and oil, food, fire protection, transportation, metallurgy, installation and maintenance. Our economic life always relies on large and small anti-corrosion (mainly based on actual reports) storage tanks. Anti corrosion (mainly based on actual reports) storage tanks are essential and important infrastructure equipment in the national economy. The important role played in development is irreplaceable. For many enterprises, normal production cannot be achieved without storage tanks, especially for national strategic material reserves that rely on various capacities and types of liquid ammonia storage tanks. Most of the cracks are shallow and long surface cracks with obvious branches. The main crack is perpendicular to the direction of the weld seam, especially at the starting and ending points of manual arc welding, T-joints, and the intersection of the head circumferential seam and the simplified longitudinal weld seam. The cracks are severe. As a special type of pressure vessel, liquid ammonia storage tanks are widely used in industry, often used for transporting products with strong acidity and alkalinity. After long-term practice, we can find that liquid ammonia storage tanks rarely experience strength damage, mostly due to corrosion cracks. More commonly, cracks occur on circumferential welds without plastic deformation, exhibiting typical brittle crack characteristics. {2} The application of laser non-destructive testing technology for LNG storage tanks in the non-destructive testing industry began in the early 1970s. Due to the performance of lasers themselves, their application in the non-destructive testing industry continued to expand, and gradually formed non-destructive testing technologies such as laser holography and laser ultrasound. These technologies have become indisputable new members of the non-destructive testing industry due to their ability in modern non-destructive testing. In recent years, their development has also been relatively fast, and their engineering applications are also quite extensive. The advantages of laser non-destructive testing are that non-contact testing does not require coupling agents, and can detect complex or difficult to access parts. At the same time, remote control excitation and reception can be achieved, thus realizing online detection of natural growth gas storage tanks. Therefore, laser non-destructive testing can be used for non-destructive evaluation of LNG storage tanks in harsh environments such as high temperature and high pressure. Its limitations include certain requirements for the surface of the object, insensitivity to deep defects, expensive equipment, and high personnel quality requirements.