Pay attention to metal surface corrosion under the insulation layer
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Metal containers, towers, storage tanks, pipelines, etc. are equipment used in chemical plants to produce, store and transport media products. Generally, chemical plant equipment outer walls and pipelines adopt thermal insulation measures. Ensure production process requirements and reduce heat dissipation (heat absorption) losses. Most of the insulation layer materials are rock wool or ultra-fine glass wool (cold insulation is closed-cell cold insulation material, such as polyurethane foam, etc.), and the outer protective layer is mostly galvanized iron sheet. Due to the long-term influence of the atmosphere, the outer protective layer ruptures, especially metal surfaces such as towers, containers, bottom corners of the outer walls of tanks, and pipes are severely corroded. Judging from the surface corrosion, some corrosion products are about 3-5mm thick, and there are corrosion pockmarks or pitting pits of varying sizes under the rust layer. In some cases, due to poor management, metal perforations are caused by corrosion and accidents occur. Therefore, we must attach great importance to the management of the insulation layer to avoid unnecessary losses. See Figures 1 and 2 for details.
This happens a lot in steam and water pipelines. How to deal with this situation?
The corrosion of this piece is often ignored due to lack of knowledge.* , we should pay more attention to it in the future
Depending on the situation, metal surfaces must be protected against corrosion.
What kind of protective treatment is needed? Generally, it is rust removal and painting during installation, but it seems to lose its effectiveness when the temperature is high.
Indeed, very little attention has been paid to it. I think that a good insulation layer is also a key step. It can reduce heat loss while preventing rainwater intrusion and equipment corrosion. The contractors selected by state-owned enterprises to do insulation work are particularly poor.
Corrosion under the insulation layer is widespread and serious
1. Failure to effectively check the anti-corrosion status of pipelines and equipment before insulation； 2. The insulation is not tight, and rain or steam enters under the insulation layer. ； 3. Under-scale corrosion occurs on the surface of the equipment under the insulation layer. ； Therefore, we must pay attention to the anti-corrosion inspection of the pipeline before insulation, and then insulate after confirmation.
How can people make money after the insulation is done once and for all? :lol