Prefabricated metal tanks or modular metal tanks consist of square or rectangular panels that are produced using the tensile process. The metal sheets used in the production process are of the suction type, which are formed inside the matrix tray mold. Depending on the type of fluid and the environment, the panels can have a variety of coatings. The panels can be hot-dip galvanized, coated or steel galvanized and there is no welding in these tanks.