Is it necessary to use cathodic protection combined with coating protection for the internal anti-corrosion of a 500m3 crude oil storage tank?

For such oil storage tanks (whose contents are similar to crude oil and are crude oil recovered from sludge through chemical thermal washing), it is possible to omit cathodic protection at the tank bottom, as these are small-scale tanks and the oil in question is crude oil that has been recovered twice; in such cases, a coating with good resistance to oil and water is sufficient for the tank bottom. In other words, the entire inner wall of the tank is coated with an antistatic paint.

Does that mean it’s sufficient to apply regular anti-corrosion treatments and ensure proper grounding of the tank? ? ?

Antistatic coating + polyaniline anti-corrosion coating: there are actual cases

Thank you for the help. What is generally used for antistatic coatings?

Conductive coatings have a history of about half a century to date. The first conductive coatings to be made public were introduced in 1948, when the United States filed a patent for a conductive adhesive made from silver and epoxy resin. In the 1950s, our country also began to research and apply conductive coatings. In recent decades, conductive coatings have been applied in various military and civilian industrial fields such as electronics, electrical appliances, aviation, chemicals, and printing. Correspondingly, theoretical research on conductive coatings has also developed rapidly, contributing to the increasing maturity and refinement of application technologies. Based on application materials, conductive materials can be classified into intrinsic conductive coatings and doped conductive coatings. Intrinsic conductive coatings refer to conductive coatings made using intrinsic conductive polymers as the film-forming material. Intrinsic conductive coatings are mainly used in anti-corrosion and antistatic coatings, radar-absorbing coatings, electromagnetic shielding coatings, etc. Doped conductive coatings refer to those based on polymer materials to which conductive substances are added, taking advantage of the conductivity of these conductive substances. Commonly used conductive fillers include metal-based fillers, carbon-based fillers, metal oxide-based fillers, composite fillers, and new types of nanoscale conductive fillers. Doped conductive coatings are widely used because of their low cost and simplicity. For example: anti-static epoxy self-leveling floors, anti-static oil tanks, aluminum profiles, steel cabinets, shelves, workbenches, new factory buildings for (Huawei, Foxconn), mine ventilation ducts, and other such applications. Industry-leading companies such as Akku, Nippon Paint, Tiger, Huajia, Wan’an, Huaguang, Xiangsheng, Ruizhi (aluminum profiles), Luoyang LeKa (steel cabinets), and Tianjin Ruiyuan (anti-corrosion) are relatively large-scale enterprises with technical R&D capabilities; their technical resources include specialized functional powders such as conductive coatings or anti-static coatings.

It is sufficient to use an antistatic anti-corrosion coating.

Under the operating conditions of this tank (temperature below 75 degrees), conventional epoxy antistatic coatings can be used.