The atmospheric environmental腐蚀等级可分为4 grades according to the uniform corrosion rate of the first year of exposure of tank metal in atmospheric environment. The corrosion grade of the medium environment can be divided into four grades according to the uniform corrosion rate and the corrosion rate of the storage tank metal by the medium.
The owner shall provide the designer and the construction party with the information on the main project such as the structure size of the tank, the storage medium and its components, and provide the atmospheric environmental data of the area where the pipe anticorrosion material is installed, as well as the design life requirements of the anti-corrosion project of the tank, and the design life of the anti-corrosion project shall be explained by the owner in the contract. When the owner does not explain in the contract, it shall be determined in accordance with the following principles, but shall be confirmed in writing by the owner. The design life of the difficult maintenance site should be consistent with the main project, the design life of the storage medium should not be lower than the main project maintenance period, when the metal coating protection is used, the design life of the coating should not be less than 10 years, the design life of the atmospheric corrosion environment can be considered according to low (L), medium (M), high (H), low (L) refers to the life of 2 years to 5 years, medium (M) refers to the life of 5 years to 15 years, high (H) refers to 15 years The design life of applied current cathode protection should not be less than 20 years, and the design life of sacrificial anode in the tank should not be less than 10 years.