Critical comments on the optimum determination of remaining wall thickness in insulated pipes by tangential radiography

This paper contains some parameters and rules which can be applied in tangential radiography for detection and evaluation of internal and external corrosion in insulated pipes. in addition, measurement of the remaining wall thickness during maintenance or during in-service inspection can also be carried out. the application of these parameters and rules, on a specially designed insulated steel pipe with internal machined slots, has provided 98% and 96% accuracies in determining the pipe wall thickness and the pipe remaining wall thicknesses respectively. (Author)