Pit-depth measurement on large diameter pipes by tangential radiography using a Co-60 gamma-ray source
Source abstract
Abstract
This paper demonstrates the capability of the tangential-radiography technique to detect internal and external pits and to measure their depths on corroded large-diameter insulated and noninsulated carbon-steel and stainless-steel pipes. Tangential-radiography technique, with special care, was successfully applied on specially designed 8-in (219 mm) and 12-in (324 mm) reference steel pipes having inside- and outside-machined steps of different thicknesses and inside and outside artificial pits of different diameters and depths on them. The application of this technique on the two reference pipes, with and without insulation, gave 98% accuracy in the determination of the pits’ depths when the pits are outside the pipes and their depths are equal to or greater than 10% of the pipe-wall thicknesses, and 96% accuracy when the pits are inside the pipes and their depths are equal to or greater than 15% of the pipe-wall thicknesses.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Non-Destructive Testing Techniques · Geophysical Methods and Applications · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (11)
Show source-provided references
1. Herbert, H. and Uhlig, R.W.R., Corrosion and Corrosion Control, New York: Wiley, 1985, 3rd ed., pp. 165–186.
2. Fontana, M., Corrosion Engineering, New York: McGraw-Hill, 1986, 3rd ed., pp. 220–256.
3. Griffiths, R., Overview of Oil Refinery Corrosion Monitoring, Non Destructive Testing (Australia), 1989, vol. 26, no.1.
4. Kenneth Billeaudeaux, J., Tangential Radiography Using a Radiation Gage, Mater. Eval., 1992, vol. 50, no.2, pp. 138–139.
5. Krolicki, R.P., Internal Corrosion Examination and Wall Thickness Measurement of Pipe by Radiographic Method, Mater. Eval., 1977, vol. 36, no.2.
6. Harara, W., Critical Comments on the Optimum Determination of Remaining Wall Thickness in Insulated Pipes by Tangential Radiography, Insight, 2001, vol. 43, no.10, pp. 679–682.
7. Harara, W., Corrosion Evaluation and Wall Thickness Measurement on Large-Diameter Pipes by Tangential Radiography Using Co-60 Gamma-Ray Source, Insight, 2003, vol. 45, no.10, pp. 668–671.10.1784/insi.45.10.668.52954 ↗
8. Willems, P. and Vaessen, B., Applicability of CR for Corrosion and Wall Thickness Measurement, Proc. of 7th European Conference on Non Destructive Testing, Copenhagen, 1998, p. 429.
9. Burkle, W.S., Application on the Tangential Radiographic Technique for Evaluating Pipe System Erosion / Corrosion, Mater. Eval., 1989, vol. 47, no.10.
10. Industrial Radiography, N.V.: Agfa-Gevaert N.V., Belgium, 1986, pp. 67–72.
11. Nondestructive Testing Handbook, McMaster, R.C., Ed., New York: Ronald, 1963, vol. 1, pp. 1915–1916.