Anti-corrosion inside pipelines for transporting ethanol gasoline
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This post was last edited by Asuka Sky on 2024-7-26 09:18. I would like to ask the experts: Do steel storage tanks and pipelines used for storing and transporting ethanol gasoline require internal anti-corrosion treatment? What should be the name of the internal anti-corrosion coating?
Pipelines used for transporting ethanol-blended gasoline require internal anti-corrosion treatment, mainly because ethanol is somewhat corrosive and can cause corrosion of the pipeline material, thereby affecting transportation safety and the lifespan of the pipelines. Ethanol undergoes a chemical reaction with the inner walls of pipes, and its corrosive effect is even more pronounced in the presence of moisture and oxygen. When selecting an internal anti-corrosion coating, one should choose a coating that can resist chemical corrosion, possesses good chemical stability, and has strong physical adhesion. Epoxy resin coatings or epoxy-modified polyurethane coatings are generally recommended; these coatings can effectively resist the corrosion of metals caused by ethanol and its mixtures, thereby enhancing the durability and safety of pipelines. .
GBT 50610-2010 Standard for the Design of Storage and Transportation of Ethanol-Benzine for Vehicles states that coatings should not be used for corrosion protection on storage tanks and pipelines. If coating-based corrosion protection is not used, what kind of corrosion protection should be employed?
Can we use a solvent-free epoxy liquid anti-corrosion paint?
According to the GBT 50610-2010 standard, if coating protection is not used to safeguard storage tanks and pipelines, the following anti-corrosion measures can be considered: 1. **Use of stainless steel**: Manufacturing storage tanks and pipelines from corrosion-resistant materials such as stainless steel, which can resist the corrosion caused by ethanol and its mixtures. 2. **Cathodic protection**: Slowing down or preventing the metal corrosion process by applying an external current. This method achieves protection by sacrificing the anode material or applying a direct current supply, thereby making the metal surface to be protected the cathode. 3. **Apply metal spraying**: Spray zinc or other corrosion-resistant metals onto the surface of steel to form a protective layer that prevents direct contact with corrosive substances. 4. **Lining**: Chemically resistant lining materials such as plastics like polyethylene and polypropylene are used to line storage tanks and pipelines; these materials offer good corrosion resistance against ethanol and its mixtures. The choice of anti-corrosion measure should take into account factors such as cost, feasibility, and the operating and maintenance conditions of the equipment. .