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Heat transfer oil is a type of specialized oil with good thermal stability, used for the indirect transfer of heat. Due to its features such as uniform heating, accurate temperature control, the ability to generate high temperatures at low steam pressures, excellent heat transfer performance, energy efficiency, and ease of transportation and operation, it has been widely used in various applications in recent years, with its uses and consumption increasing steadily. However, during use, improper operation or other factors can cause the heat transfer oil to oxidize, resulting in the formation of various deposits. Over time, these deposits can cause severe corrosion damage to the inner walls of the heat transfer oil pipes, leading to leaks in those pipes. Corrosion and leakage in heat transfer oil pipes must be repaired as soon as possible; otherwise, serious accidents can occur that threaten lives and property. In 2009, a factory in Fujian suffered an accident due to corrosion and leakage in its heat transfer oil pipes, which was exacerbated by exposure to open flames, resulting in 12 workers being injured and hospitalized. This bloody lesson serves as a clear reminder of the importance of taking matters seriously when dealing with corrosion issues in heat transfer oil pipes. A leak occurred in the heat transfer oil pipes of a certain group. Upon investigation, it was found that the cause of the leak was air entering the system through an open expansion tank, which led to the oxidation of the heat transfer oil. This resulted in the formation of large amounts of solid contaminants within the heat transfer oil system. The corrosion products and oxidized impurities from the heat transfer oil would deposit on the inner surfaces of the pipes, especially at the bottom and in areas that are difficult to reach, causing corrosion and leaks in those pipes. It is urgent to address these leaks; after learning about Sorey’s carbon nanopolymer materials, the company decided to use them for repairs. The specific repair steps are as follows: ① Safety training was conducted prior to starting the work, and a fire permit was obtained in accordance with regulations. Led by the company’s management, they went to the work site ； ②Check the device condition and follow detailed repair procedures. Wipe away oil stains and scale, then polish to remove corrosive impurities ； ③Process a stainless steel pipe to be inserted into the heat-conducting pipe for leak repair; clean the surface to be repaired with anhydrous ethanol ； After roughening the surface of the steel pipe, it is also cleaned thoroughly with anhydrous ethanol ； ④Apply the harmonic Sorey carbon nanopolymer material SD7104 evenly to the inner surface of the pipe to be repaired; the coating thickness should be uniform, and the surface of the steel pipe should also be completely covered with this material ； ⑤The area to be repaired should be covered with a layer of fiber tape, of appropriate length and width. ⑥Insert the steel pipe coated with material into the pipeline, use a hot air gun to slightly solidify it, smooth out any gaps with your fingers, and remove any excess material ； ⑦After waiting 4 hours for the material to cure naturally, reinstall the components ；