What is the impact of repair after embrittlement on the equipment’s lifespan?
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Taking into account the causes of brittle failure in refining equipment mentioned earlier, as well as the background related to maintenance, the impact of repairs after such failure on the equipment’s lifespan can be divided into two scenarios: high-quality, compliant repairs can extend the lifespan; proper maintenance can eliminate the cracks caused by brittle failure and restore the toughness of the material. By carrying out major repairs, the equipment can regain its original performance, allowing it to continue in service for several years, approaching the remaining lifespan specified in its design, and thus preventing premature disposal of the equipment. Poor maintenance can significantly shorten the device’s lifespan. If the maintenance process does not meet standard requirements, and the causes of brittleness are not completely eliminated nor are the residual stresses removed, this will lead to further deterioration in the device’s performance, resulting in frequent failures over time. In the end, the device gets damaged prematurely, failing to reach the expected lifespan specified during its design.
The original poster’s analysis is spot-on; indeed, the quality of maintenance directly determines the subsequent performance of the equipment. I would like to add a few points based on practical experience: It is best to conduct non-destructive testing (such as ultrasound or magnetic particle testing) before repairs, in order to determine the location and depth of cracks. This allows for more targeted repair plans, helping to avoid missing any cracks or over-repairing. The heat treatment performed after repair (such as stress-relief annealing) is crucial; if residual stresses are not relieved, cracks may re-expand during operation of the equipment, and this is often the \"hidden killer\" of poor repairs. It is recommended to conduct operational monitoring for a period of time after the repair (such as checking the wall thickness or cracks on a quarterly basis), so that potential issues can be identified promptly, and it can also be determined whether the repair was effective. Furthermore, there are significant differences among various device standards; it is best to determine them based on the specific materials and operating procedures. It is also advisable to consult a qualified testing institution when necessary for greater certainty.