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http://dx.doi.org/10.7842/kigas.2021.25.5.30

Residual Life Assessment of mod HP Reformer Tubes Using Surface Replication Methods  

Ryu, Hyung Ki (Graduate School Chung-Ang University)
Le, Thi Giang (Dept. of Mechanical Engineering Chung-Ang University)
Bang, Hyo Jung (Dept. of Mechanical Engineering Chung-Ang University)
Yoon, Kee Bong (Dept. of Mechanical Engineering Chung-Ang University)
Publication Information
Journal of the Korean Institute of Gas / v.25, no.5, 2021 , pp. 30-36 More about this Journal
Abstract
Residual life assessment of reformer tubes of mod HP steel used in the refinery and petrochemical industry were investigated by quantitative metallographic evaluation method. Area fractions of precipitated carbides were measured by using surface replication and its relationship with the remaining life of the tube was investigated. The microstructures of the virgin and other tubes were examined using optical microscopy (OM) for service periods of 1.8, 6.0, 7.2, 8.5, 9.7, and 16.2 years at 950 ℃ and the area fractions of the precipitates were measured by image analysis using ImageJ software. As the area fraction of the precipitates increased, the residual life was decreased accordingly. The results showed that the LMP was the highest in the virgin and the LMP decreased as the service time increased and the residual life decreased. A regressional equation showing the relation between the area fraction of carbides and LMP was experimentally derived. The obtained relationship can be used with the surface replication method for on-site residual life assessment.
Keywords
mod HP; creep; area fraction; residual life assessment; image analysis; LMP;
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