Material problems in oil-related facilities, that is, oil & gas wells, refineries and chemical process industries, were summarized for the last thirty years. Especially, in refineries, most of the material failures have been experienced and many research works to prevent the failures have been reported up to this time. However, many fire accidents due to corrosion failures have still occurred. As many large-sized plants in refinery and petrochemical complex in Japan have been operating for more than twenty years, newly developed reliable and economical maintenance technologies will be strongly requested.
