Akademik Veri Yönetim Sistemi
MATERIALS TESTING, cilt.54, sa.1, ss.49-52, 2012 (SCI-Expanded)
Remaining service life of a petrochemical plant reformer tube, which has been exposed to water vapour at 540 degrees C for 22 years under an internal pressure of 88 bar, was analysed via the Larson-Miller approach. Samples machined from the exposed and the original tubes were subjected to stress rupture tests at various stress levels and temperatures to determine the variation of the Larson-Miller parameter with the applied stress. At a service temperature of 540 degrees C, the remaining service life decreased with increasing applied stress. For the stress of 42 MPa, which corresponded to the hoop stress generated on the tube during service, it was estimated that the tube has completed about 50 % of its actual service life.