What pipelines in the liquid chlorine storage facility and its associated equipment are subject to dew point corrosion?
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The Guidelines for the Safe Renovation of Liquid chlorine Storage Facilities and Related Equipment, as well as Emergency Response to Liquid Chlorine Leaks (Trial) in XX Province specify the need to strengthen the inspection of pipelines subject to dew point corrosion: 1. Which pipelines are affected by dew point corrosion? 2. What kind of inspections should be carried out?
Friends from Shandong Province, please participate more in the discussions. Do you all understand what I’m saying?
Looking at the data on salt spray corrosion: it is described that chloride ions penetrate the oxide layer and protective coating on the metal surface, and undergo electrochemical reactions with the metal inside. Furthermore, chloride ions possess a certain amount of hydration energy, allowing them to be adsorbed in the pores and cracks on the metal surface. There, they replace the oxygen in the oxide layer, converting insoluble oxides into soluble chlorides. This transforms the passivated surface into an active one, thereby causing significant damage to the metal.
Corrosion Under Insulation (CUI) refers to the corrosion that occurs in metal pipes or equipment covered by insulation, in the presence of water and corrosive substances. CUI is highly concealed and difficult to detect immediately, which makes it extremely prone to sudden leakage accidents. Generally, the probability of corrosion beneath the insulation layer in equipment or pipelines increases significantly after 5 years of operation, while pipelines that have been in use for 16 to 20 years are most prone to leakage. CUI not only causes product leakage, equipment failure, or shutdowns and increased maintenance costs, but it can even lead to casualties. Every year, the global losses caused by CUI amount to billions of dollars. In domestic projects, CUI has not received widespread attention; efforts have been limited to aspects such as insulation design or protective coatings only. Therefore, it is necessary to conduct a comprehensive analysis of it throughout the entire project lifecycle.
Therefore, it is now changed to polyurethane foam insulation, with the requirement that there be no gaps between the insulated object and the pipelines and storage tanks. Reduce surface water! The main components are the contact point between the bottom of the storage tank and the tank outlet, as well as the valves
Try to eliminate these potential problems during the design and construction phases