Equipment corrosion standards

Standards for Equipment Corrosion Prevention Management (ZT) Organization and Division of Responsibilities 1. The Maintenance Department assigns dedicated personnel responsible for corrosion prevention planning and technical management of all equipment in the plant; workshop equipment officers are in charge of the specific tasks related to equipment corrosion prevention. 　　2. Test researchers and construction units involved in corrosion prevention management must continuously conduct surveys on equipment corrosion and protection at the head office, formulate corrosion prevention initiatives and plans, analyze the causes of corrosion and corresponding protection methods, and summarize corrosion prevention techniques based on experience and achievements. 　　3. The equipment department shall ensure that the materials, protection methods, and structure of anti-corrosion equipment are correct and appropriate. The equipment manufactured by the manufacturing department (unit) must meet the design drawings and technical specifications; installers need to be aware of the properties and requirements of corrosion-resistant materials to prevent damage during installation. 　　Creation of archival records and technical management 1. For equipment, pipelines, etc. that are subject to corrosion by the production media, the Mechanical Department is responsible for creating anti-corrosion archives and cards. These records should include information such as the name and model of the equipment, its specifications, operating temperature and pressure, the type of material used, its performance characteristics, as well as the anti-corrosion measures taken. They should also cover the date of installation, the construction methods used, the equipment’s usage history, details of each inspection and maintenance session, etc. For equipment that is generally subject to atmospheric corrosion, a corrosion prevention record book should be maintained on a per-unit or per-area basis; a record should be kept each time corrosion prevention measures are taken. 　　2. The Maintenance Department shall, based on the corrosion issues encountered in production and the available construction resources, organize the revision of the anti-corrosion plan for the following year by June 15 of each year, which shall include experimental research projects and budgetary costs for the trial production of equipment. 　　3. Appropriate anti-corrosion measures shall be taken for all equipment that is prone to corrosion. For equipment that already has such measures in place, these measures must not be removed without reason or altered arbitrarily. Production practice has shown that such actions are indeed inappropriate; a new proposal must be submitted by the workshop, reviewed by the Machinery Department, and only after approval by the deputy head of equipment or the chief engineer can the original anti-corrosion measures for the equipment be modified. 　　4. The use of new corrosion-resistant materials and the adoption of new anti-corrosion technologies must go through small-scale tests and medium-scale evaluations; there must be solid scientific evidence to support their use in production. 　　5. The Mechanics Department is responsible for organizing the relevant production workshops to conduct experimental research on atmospheric corrosion, analyzing the causes of corrosion, and proposing anti-corrosion measures as well as protection methods. Corrosion problems that cause production disruptions due to severe corrosion during manufacturing were taken as the main focus for experimental research, in order to determine appropriate anti-corrosion measures. 　　6. Whenever process conditions in production are changed, or equipment, pipes, and fittings are replaced or added, the corrosion resistance of the materials must be taken into account. 　　Maintenance and Repair 　　1. For equipment that has undergone anti-corrosion treatment, regular inspections and planned repairs are necessary. Improvements to anti-corrosion measures (including the use of new technologies and materials) should be carried out in conjunction with planned maintenance. 　　2. Eliminate phenomena such as dripping, leaking, running, and escaping; do not install backflow or vent pipes arbitrarily. The waste gas and wastewater generated during equipment maintenance and venting are also subject to strict treatment to prevent corrosion of the equipment and buildings. 　　3. When the equipment is no longer in use, anti-corrosion measures should be taken, such as emptying, purging, nitrogen filling, and degreasing. 　　4. Welding of components is strictly prohibited on equipment with anti-corrosion coatings. When welding is necessary, reliable measures must be in place or anti-corrosion treatment must be reapplied after welding. 　　5. When using special corrosion-resistant metals or alloy materials, it is necessary to strictly follow the process specifications for welding, cleaning, heat treatment, etc., during manufacturing and maintenance. In highly corrosive media, avoid using metals of different types together. 　　6. Hitting and striking non-metallic equipment as well as equipment and fittings with anti-corrosion coatings is strictly prohibited. 　　7. Strictly follow the maintenance and construction procedures for anti-corrosion equipment to ensure construction quality and personal safety. 　　8. Extend the service life of equipment, pipelines, and buildings by carrying out rust removal, anti-corrosion, and painting tasks in conjunction with major repairs and routine maintenance. 　　9. The corrosion-resistant materials used must meet the technical requirements, and they should come with inspection certificates and the date of manufacture. 　　Inspection and documentation of equipment corrosion prevention 1. The Mechanical Department shall organize relevant units to conduct inspections and assessments of the corrosion and protection status of the company’s equipment, pipelines, and factory buildings at least once a year, and submit a written report. 　　2. It is necessary to gradually introduce advanced condition monitoring instruments to monitor the corrosion status of operating equipment, thereby laying a foundation for predictive maintenance. 　　3. Regular inspections for equipment corrosion include the following: (1) analysis of the type of corrosion, the depth of corrosion, the condition of welds, and analysis of corrosion products. (2) Metallographic microscopic examination, flaw detection, degree of aging of the anti-corrosion coating, cracking and peeling, wear, and other forms of damage. 　　4. The results of the inspection shall be recorded in detail (in two copies), to be filed and kept by the Machinery Department and the workshop. 　　5. The annual inspection is carried out on the basis of self-inspections by each unit. During inspection, for devices of the same type, 1 to 2 units are randomly selected for inspection based on their quantity. For pipes of the same type, two sections are inspected from the main pipeline or branch pipe.

The equipment corrosion standards can still be found on the Shanggong Biaowang website

SY0007—1999 Design Code for Corrosion Control of Steel Piping and Storage Tanks; HG\T20679—1990 Specifications for External Corrosion Protection Design of Chemical Equipment and Piping; HG\T20696—1999 Design Specifications for Fiberglass-Reinforced Plastic Chemical Equipment; CECS73:1995 Technical Code for Corrosion Protection Using Xylenic Unsaturated Polyester Resins; CECS116:2000 Technical Code for Corrosion Protection Using Potassium Silicate; CECS18:2000 Technical Code for Corrosion Protection Using Polymer-Cement Mortar; CECS133:2002 Technical Specification for the Protection of Steel Structures Using Unsaturated Polyester Resin Composite Materials

It is the replacement standard for pipeline corrosion.

The original poster is incorrect; for equipment pipelines with different diameters, thicknesses, and application scenarios, the minimum thickness varies, and it should be determined based on design criteria. For example, in cases where design is based on strength requirements, the pipeline must be replaced once its wall thickness becomes too thin to ensure the required strength. From a management perspective, the component should be replaced immediately when the actual wall thickness is less than the designed wall thickness.

It is calculated based on the annual corrosion rate of the material! The annual corrosion rate of a material can be found in corrosion manuals

There are two solutions to this problem. The first is to consult the design documents for the equipment and pipelines, including design drawings and pipeline specifications, which outline the designed thickness and the calculated thickness. The calculated thickness represents the minimum requirement to ensure the safe operation of the equipment and pipelines; if the actual measured thickness is lower than this value, it is necessary to replace them immediately. The second approach is that for pressure-bearing pipelines and equipment, inspection agencies usually carry out inspections, and in most cases such inspections are mandatory. These agencies inspect the equipment and pipelines every few years and determine a period during which they can continue to be used. They calculate the wall thickness of the pipelines and equipment based on factors such as corrosion, so as to ensure safe use over that period. In such cases, all you need to do is look at their inspection reports. For process engineers, it is recommended to use the second method, as it is both convenient and safe. 1# echang9999