Pipes and pressure vessels are often subjected to operating environments where corrosion can degrade metal components and welds that join them. A program of regular system inspections is required to ensure the safe use of these systems and to reduce the possibility of costly shut-downs. This is especially true with recent changes in laws and regulations and social responsibility caused by environmental concerns which emphasize “zero” leaks in a wide variety of processing equipment. A comprehensive preventative maintenance program is needed to maintain high reliability in processing systems. An effective inspection strategy is essential in that program.