Abstract
The high temperature parts of a thermal power boiler are designed by allowing for stress based on 105 h creep rupture strength. As a safety factor is involved in the allowable stress, the parts can be operated for more than 105 h. Actually some units have been operated for over 3×105 h. Life evaluation is required for the units operated for such a long time to maintain reliability. Various researches for evaluating residual life have been carried out and some have been applied to actual units. But the results of life evaluation done on actual units have not been verified. In this paper, the verification of life evaluation methods is performed with a weld elbow of steam pipe used for 2.6×105 h in an actual plant.
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