Service Life Prediction of Industrial Pipe-line

Abstract

To perform the water-leak protection and effective renewal of industrial pipe line, the life-time prediction has been discussed on the basis of the measurements of the wall thickness of pipes in service. The followings are concluded : (1) the life time of a pipe line in inside corrosion can be predicted from the maximum pitting depth estimated by the extreme value statistical analysis of the data obtained from the relation between corrosion pit depth and rust-lump height. (2) the grooving depth of ERW pipes can be measured by the ultrasonic angle beam testing method quantitatively. If the supply water is drained, the estimation of the grooving depth is qualitatively made by means of the X-ray transmission method.