The capability to assess the secure remaining life of components operating in the creep range, thereby assuring integrity between inspection intervals, has become a major factor in the economic operation of power and petrochemical plant which has passed the original design life, frequently by a considerable margin. An overview is given of the nature of remaining life assessment and examples given of methods developed for headers, seam-welded pipe and fued heaters. The more common problems associated with weldments are also reviewed. Keywords: remaining life, power plant, petrochemical plant, headers, ligament cracking, weldments, heat affected zone, reheat cracking, Type 1V cracking, seam-welded pipework, tired heaters, temperature measurement