Any corrosion problem must be investigated through the field, through the daily monitoring and regular testing of equipment, in order to understand the shape of corrosion and grasp the specific circumstances of corrosion, in order to take effective measures to solve it. Heat exchanger unit corrosion investigation can be in the heat exchanger unit shutdown maintenance to take the regular corrosion inspection. Here we introduce some inspection methods and prevention strategies.

Here is the content list:

• Macroscopic detection

• On-site thickness measurement

• Use corrosion inhibitors to prevent and control

• Corrosion inhibitors in acidic solutions in the application

• Application of water stabilizer

Macroscopic detection

With the naked eye or low magnification on the body of the heat exchanger unit for careful observation and inspection, the initial determination of the corrosion of equipment morphology. Type, the degree of corrosion, and key corrosion sites. For example, the heat exchanger unit, the general method of visual inspection of the tube mouth, such as the need to also use the tube endoscope for random inspection of the tube. If the proportion of the number of corroded tubes in the random inspection accounted for more than 80%, the need for all the tube bundles to be inspected root by root. Before thoroughly checking the tube corrosion, the tube should be cleaned internally.

On-site thickness measurement

On-site thickness measurement of the heat exchanger tube can calculate the actual uniform corrosion rate of the heat exchanger, and then infer its service life, thickness measurement should pay attention to the parts to be fixed in order to compare.

Use corrosion inhibitors to prevent and control

Corrosion inhibitor protection with less investment, fast results, easy to use, and other characteristics, but the application of corrosion inhibitors also has certain limitations. Corrosion inhibitor has a strong target, such as a certain medium and metal with a good effect of corrosion inhibitor, another medium or metal may not be effective, or even harmful. Therefore, corrosion inhibitors in the heat exchanger unit working environment should be strictly selected according to the specific circumstances.

Corrosion inhibitors in acidic solutions in the application

Water-cooled condenser using chemical descaling, acid corrosion problem will occur. In order to prevent the corrosive effect of the solution on the equipment, when pickling with hydrochloric acid, 0.2% organic compounds such as aniline-sulfur gland or sulfonated castor oil can be added to the solution to effectively inhibit corrosion. The use of corrosion inhibitors in the pickling process is to cause selective corrosion conditions, when the scale is destroyed and dissolved, but will not corrode the metal. This can effectively avoid the corrosion of heat exchanger units.

Application of water stabilizer

Scaling inside the heat exchanger unit will not only reduce the efficiency of the refrigeration unit, but also the corrosion caused, which will seriously affect the service life of the unit. In the heat exchanger anti-scaling treatment, water-quality stabilizers can be used to prevent scale. However, many circulating cooling water anti-scaling agents have a certain degree of environmental pollution, be sure to pay attention when using them.

Above we accept several ways to determine whether there is corrosion in the heat exchanger unit. At the same time, we also gave some heat exchanger corrosion that occurred after the prevention and control strategies. How to extend the service life of heat exchangers has been the main direction of scientific research of Shanghai Jiangxing Chemical Equipment Co.Led. If you are planning to buy a heat exchanger in the near future, this company will be your best choice.