Corrosion Causes and Treatment Measures of Liquefied Petroleum Gas Storage Tanks
Time:2021-11-04
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Corrosion Causes and Treatment Measures of Liquefied Petroleum Gas Storage Tanks
Causes of corrosion of liquefied gas storage tanks and treatment measures. Liquefied gas storage tanks are important equipment for containing liquefied petroleum gas. Due to its flammable and explosive characteristics, if the corrosion of liquefied gas storage tanks occurs during storage, it is very likely to cause large Large-scale safety accidents have caused huge economic losses and casualties. Therefore, in the management of the petrochemical industry, we must pay attention to the analysis of the causes of corrosion of liquefied petroleum gas, and actively formulate effective treatment measures.
Research on the corrosion of liquefied gas storage tanks. Most of the oil products stored in liquefied gas storage tanks contain: sulfuric acid, hydrogen, organic and inorganic salts, and moisture and other highly corrosive chemicals. Effective anti-corrosion treatment is very likely to cause different degrees of corrosion in the liquefied gas storage tank, which will greatly shorten the service life and safety factor of the liquefied gas storage tank. In the daily management of domestic petrochemical enterprises, there is often the problem of neglecting the anti-corrosion treatment of the liquefied petroleum gas storage tank, which may not only affect the nature and quality of the liquefied petroleum gas, but also easily cause the liquefied petroleum gas leakage, fire, explosion or environment Major accidents such as pollution. It can be seen that strengthening the research on the corrosion of liquefied gas storage tanks is one of the daily tasks that petrochemical companies and users must pay attention to.
(1) The cause of corrosion is analyzed from the perspectives of physics and chemistry. There are many types of corrosion of liquefied gas storage tanks, and the main surface morphologies are: pitting corrosion, intergranular corrosion, interlayer corrosion, uniform corrosion, and hollow corrosion. Bubble corrosion, crevice corrosion, bimetal corrosion, stray current corrosion, wear corrosion, environmental corrosion, erosion corrosion, deposition corrosion, etc., but in the current domestic petrochemical industry management, chemical corrosion and electrochemical corrosion are the most common Two types of corrosion of liquefied gas storage tanks. Compared with the electrochemical corrosion of liquefied gas storage tanks, chemical corrosion can only occur in specific environments and places, and the probability of occurrence is relatively small. Therefore, electrochemical corrosion has become one of the main reasons for the corrosion of liquefied gas storage tanks. Although the liquefied gas storage tanks must undergo rigorous treatment before being put into use, preheating, layer temperature and post-weld heat treatment are commonly used in China. The fundamental purpose is to further eliminate the stress and hydrogen of the liquefied gas storage tanks. Factors that may cause corrosion. However, due to the influence of the operating technology level or the overall process, a certain residual stress often remains in the underground liquefied gas storage tank, which in turn increases the probability of corrosion of the underground liquefied gas storage tank.
(2) Corrosion rate In the development of the international petrochemical industry, the research on the corrosion rate of liquefied gas storage tanks is relatively early, and many professional results have been obtained. In the early 1950s, professional technical units and scientific research units in the petrochemical industry in the United States jointly carried out the problem of the stress corrosion rate of liquefied gas storage tanks. The Association of Corrosion Engineers put forward its specific research conclusions: in the case of a certain amount of liquid phase water in the liquefied petroleum gas, the gas phase partial pressure of HS is greater than 0.00035MPa, 2 there may be Hs corrosion or damage to the liquefied gas storage tank 2 Possibility and danger, and the corrosion rate is affected and limited by various external environmental factors and the material factors of liquefied petroleum gas storage tanks.
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