Effects of anti-corrosion and non anti-corrosion treatments on carbon steel pipe bundles
Thread Content
The constant-pressure top gasoline cooler tube bundle (Φ1100) used in petrochemical constant pressure and reduced pressure units was scrapped after more than 3 years of use due to tube bundle corrosion; Figure 1 shows the corrosion condition on the outer wall of the tube bundle. Figure 2 shows the updated tube bundle with an anti-corrosion coating after more than 3 years of use, without any cleaning. Fig 1 Fig 2
【Haichuan Spring Festival Tea House: Spending Money】On the fourth day of the New Year, may everything go as planned and smoothly! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5713936 (Source: Haichuan Chemical Industry Forum (Hua Hai Chuan Liu hcbbs))
Teacher, in butadiene plants, for the heat exchangers where butadiene is on the tube side and circulating water is on the shell side, the anti-corrosion measures applied outside the tube bundle are not very effective in practical use, and owners are reluctant to adopt them. For example, Lumms’ vertical spiral baffle heat exchangers, as well as the horizontal heat exchangers used in China. In my experience, initially the tube bundles are made of carbon steel, but they corrode very quickly and cannot last through a single maintenance cycle; leaks may occur after just one or two years. Some people consider painting the outside of the tube bundles to prevent corrosion, but in practice this approach is not effective. In the end, people opt to upgrade the material used – most switch to 316L. Those who find 316L too expensive choose 304 instead, but we all agree that 304 poses too high a risk when used with circulating water containing high levels of chloride ions. I just want to know whether there have been any advances in corrosion protection methods for the outside of the tube bundle in heat exchangers where circulating water flows through the shell side. Is it entirely dependent on the manufacturer’s painting skills?