Seek examples of technical solutions for pressure vessel repair

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In accordance with the requirements of regulations 124–126, a repair plan must be developed for pressure vessels. After reviewing Chapter 8 – Repair and Modification of In-Service Pressure Vessels, I found that it states that the repair plan should include: the standard criteria upon which the plan is based; an analysis of the causes of the defects; the dimensions and locations of those defects; the procedures for carrying out the repairs; methods for checking the quality of the repair work; and the performance indicators and acceptance standards that the vessel must meet after the repairs. Since I have previously only been involved in the manufacturing process of new products, I am not very familiar with these requirements. It seems much more complicated than working on a new product, and I’m not sure where to start. Therefore, I would appreciate it if experienced colleagues could offer their guidance. Thank you. It would be ideal if a complete repair plan for pressure vessels could be provided.