What are those dark marks on the ventilation holes of the manway reinforcement ring of the methanol storage tank?
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What are those dark marks on the ventilation holes of the manway reinforcement rings of carbon steel storage tanks and methanol storage tanks?
These dark marks may be caused by corrosion and contamination deposits resulting from the reaction of methanol with metals or pollutants during storage. It is also possible that prolonged use and environmental factors have caused oxidation or other chemical changes on the metal surface. It is recommended to carry out cleaning and check whether repairs or part replacements are needed to ensure safety. .