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Cooler oil leakage is mostly caused by thinning and rupture of the shell

Published on:

2021-09-15

When the oil cooler leaks, many customers do not notice, and continued use will cause damage to the performance of the oil cooler as well as insecurity, so this requires us to deal with it in a timely manner. Today, Yuanwang Heat Exchange is here to explain the causes and solutions of oil cooler leaks.

　　When the oil cooler leakage occurs when using, feel with your hand, you can feel the very obvious bumpy or crack, which means that the shell is thinning, resulting in leakage. Caused by the thinning or rupture of the shell to produce leakage of the main reasons are as follows.

　　1, first of all, the oil cooler condensing column tube and tube plate is used between the paste expansion plus welding, general inlet gas temperature can be as high as 170 degrees Celsius, while the cooling water temperature is below 30 degrees Celsius, the temperature difference is large. Due to the different materials and thermal expansion coefficients of the heat exchanger tube and the shell, coupled with the large temperature difference stress, it will easily cause the heat exchanger tube to become thin, and over time will make the thinning place rupture, and then produce leakage.

　　2, the gas inlet water vapor content is very high, the gas flow rate is very large, high temperature, will directly wash the tube. Once the gas is cooled rapidly, the wall temperature of the head section is relatively high, and the cooling water will evaporate violently in the slit of the head, which will cause the thinning of the column tube to produce leaks after a long time. When using nitrogen oxide gas, once it enters the oil cooler temperature will drop, it will produce condensation acid, and the condensation acid produced in the inlet temperature is relatively high, it will corrode stainless steel. If the tube leakage phenomenon, it is easy to make the nitrogen oxide gas into the circulating water, once into the circulating water will produce dilute nitric acid, which will corrode the carbon steel shell and composite tube plate, will accelerate the rupture of the tube.

　　Treatment methods.

　　1, first of all, for the inlet temperature to be reduced, the inlet pipeline to be removed, welded water jacket to two, the choice of cooling with circulating water, so that the inlet temperature can be reduced by 8 degrees Celsius, which can reduce the stress.

　　2, secondly, can also eliminate part of the stress, that is, in the equipment barrel to increase the expansion joint; Finally, the oil cooler condensing column tube and tube plate used between the paste expansion plus welding can be directly selected welding, which is conducive to the elimination of expansion stress. For Cl- corrosion problem, can be taken to reduce the concentration of Cl- in the circulating water to weaken the Cl- corrosion.

　　In summary, the cooler shell thinning and rupture is determined by its working principle, so we usually use the cooler must be detailed knowledge of all aspects of the equipment, the problem in order to prescribe the right medicine, troubleshooting, Xin Yixiang heat exchanger will also continue to bring you the knowledge of the cooler, welcome your attention.