Does the performance of the heat exchanger anti-corrosion coating change after maintenance, cleaning, and purging?

TH847 and TH901 have high heat resistance and high thermal conductivity, but it is unknown whether they will be damaged by purge steam; I look forward to answers from fellow users who know more!

TH-847 cannot be purged with steam, while TH-901 can. Because the temperature tolerance of 847 does not exceed 150 degrees

That’s a good question. Our factory has encountered a similar issue recently: the heat exchanger cores made of TH847 and SHY-99 have essentially fallen off after about three months, resulting in blockages in the tube bundle. Surface treatment before applying these coatings is very important; in practical applications, the results often do not match those achieved in the laboratory. Conclusion: It is best not to use preservatives and to replace it regularly.

The paint is pretty good. I don’t know who did the work in your home; I think the quality of the work is very important. In Hebei and Shandong provinces, I’ve seen each one have at least one company that takes on projects just because they have some connections – those sites are nothing but makeshift workshops, so how can the quality be guaranteed?

The last edit to this post was made by Piggy Student on 2017-6-21 at 14:54. After being manufactured by the factory, SHY-99 can be used on-site for 3-4 years without any problems; only the pipe ends may come loose. However, care must be taken to protect the pipe bundles during pressure testing and reinstallation

The last edit to this post was made by xlxuiin on 2017-7-2 at 10:32. The characteristics of the three types of coatings are as follows: I. Features of TH-901 coating 1. TH-901 is a high-performance anti-corrosion coating derived from Chinese lacquer, modified with organic titanium； The TH-901 coating focuses on heat and oil resistance, capable of withstanding temperatures up to 300°C, achieving a performance that is \"superior to that of raw lacquer\". 2. Outstanding heat and oil resistance: Heat exchangers in the oil refining industry operate under complex conditions involving heat (150–300°C) and oils (crude oil, gasoline, diesel), conditions that make it nearly impossible for any coating to provide resistance. The TH-901 coating boasts excellent heat and oil resistance, allowing it to be fully utilized in oil extraction, refining, and storage applications. With the addition of conductive fillers, it can also be used as a high-temperature anti-static coating. 3. Reliable safety: The difference between TH-901 paint and ordinary lacquer paints is that it does not possess any toxic substances that can cause allergies; it is a new type of modified lacquer paint that is reliable and safe. 4. Good application properties: TH-901 anti-corrosion coating is a one-component, self-drying coating that can be applied by spraying, brushing, or dipping. Its easy application facilitates on-site use, eliminating the need for drying equipment, reducing energy consumption, and avoiding unnecessary transportation of equipment back and forth. II. Product features of the heat exchanger anti-corrosion coating TH-847: TH-847 coating is formulated using epoxy resin and specific amino resins as the base materials, to which appropriate amounts of various rust-proof, anti-corrosion, thermal-conducting pigments, fillers, additives, and solvents are added. The resin cross-links and cures into a film at high temperatures. Product features include: 1. It has excellent adhesion, and the paint film is shiny, flexible, dense, and hard. 2. It possesses excellent shielding, impermeability, and rust resistance properties. 3. It possesses excellent resistance to high temperatures (the long-term operating temperature of the medium ≤ 150°C), as well as resistance to water and industrial water containing corrosive substances. 4. It has good scale inhibition and heat transfer properties. 5. It exhibits excellent resistance to heat, acids, strong bases, organic solvents, etc. III. SHY—99 Anticorrosion Coating: The SHY—99 anticorrosion coating is a one-component thermosetting anticorrosion coating designed specifically for heat exchangers. It is produced through a special manufacturing process using modified heat-resistant and corrosion-resistant polymer resins, as well as heat-resistant and corrosion-resistant fillers and special additives. This coating has the following characteristics: 1. It exhibits excellent resistance to acids, alkalis, oils, organic solvents, as well as salt and aqueous solutions, enabling the service life of equipment to be extended by more than 3 times. 2. Its excellent scale-inhibiting properties can effectively improve the operational efficiency of the equipment, reduce labor intensity, and minimize economic losses caused by unplanned shutdowns. 3. Its unique high-temperature resistance ensures that the coating remains intact and undamaged even when exposed to 240°C high-temperature steam for 24 hours during purging processes. The operating temperature of the coating, as well as the working temperature, should be ≤300°C. 4. Good thermal conductivity ensures stable heat exchange, thereby improving the operating performance of heat exchange equipment.

It looks very professional. May I ask, what are the advantages and disadvantages of these layers compared to polyurea? What are their characteristics and differences then? A lot has been said about polyurea before; why hasn’t there been any activity recently?

It can indeed achieve anti-corrosion effects, but further technical improvements are needed. Our factory uses this technical equipment for anti-corrosion purposes, which delays corrosion by half a year to one year; however, the name and model are different from these