ABSTRACT
It is not the intent here to cast doubt, however, on in-service repairs. When properly performed by trained technicians using proven designs and materials, these in-service repairs may last for years even though the units may experience
several thermal operating cycles in the interim. Personnel safety and plant equipment safety must also be prime concerns when applying in-service repair technology. Many hazards are encountered that would not be obvious to the untrained or ill-trained technician performing in-service repairs. Hazardous chemicals, high pressure, high temperature, and severely blowing leaks are just a few of the hazards encountered by in-service repair technicians. Generally speaking, every in-service repair is unique and must be planned accordingly in order to achieve a high degree of success at sealing the leak and to ensure that the leak will remain sealed even though adverse operating conditions may exist.
