Basis for corrosion inspection during major overhauls

It is very important to conduct corrosion surveys and inspections during the overhauls of petrochemical plants; this helps determine whether there are any corrosion issues with the equipment, allowing appropriate measures to be taken for repair or replacement. Currently, there are some relevant international standards and guidelines that can serve as a basis for corrosion investigation and corrosion inspection. The more commonly used standards in this regard are as follows: 1. ISO 8502-3:1995 \"Surface preparation methods for prefabricated steel structures – High-pressure water jet cleaning – Part 3: Measurement of corrosion contamination\", which is a standard for using high-pressure water jet cleaning to measure the degree of corrosion contamination. 2. ASTM D610-08(2013) “Standard Practice for Visual Evaluation of Surface Coatings,” which provides a method for assessing corrosion on the surface of coatings. 3. NACE RP0170-2005 \"Code of Practice for the Design and Construction of Buildings and Facilities to Protect Steel Structures from Corrosion Damage,\" which provides design and construction recommendations to prevent corrosion. In addition, many ** and regions also have their own relevant standards and specifications, such as China’s \"Procedures for Inspection and Evaluation of Equipment in the Petrochemical Industry\" and America’s API 653 \"Standards for Inspection, Repair, Reconstruction, and Modification of Steel Oil Storage Tanks\". Therefore, when conducting corrosion investigations and inspections, the above standards and guidelines can be referred to, and appropriate work plans and methods can be developed based on specific circumstances. At the same time, it is also necessary to take into account the relevant regulations and requirements of the **or region where it is located. It is best to consult a professional engineer or corrosion expert for more accurate guidance. .

Generally, during major maintenance periods, each company should have its own regulations for investigating equipment corrosion. The general contents of the corrosion investigation are: a. Investigation of historical circumstances ； b. Investigation of the types of process media and corrosion environments ； c. Investigation of the corrosion condition of equipment and apparatus ； d. Investigation of corrosion types ； e. Usage of original anti-corrosion measures ； The results of the above investigations should be compiled into a report and then stored uniformly in the corrosion database of the equipment information management system.