Abstract
Boiler tubes in a fossil-fuelled power station are subjected to erosion and corrosion that caused the tubes to become locally thinned or scarred. To avoid unscheduled tube failures and hence prevent large financial loss due to boiler shut-down and tube repairs, it is important to estimate boiler tube lives. Boiler tube lives are very sensitive to tube temperature. This paper describes the development of a non-dimensional parameter termed T ∗ . It is shown that T ∗ can be used to estimate the tube temperature variation in the scarred tube section. Also a method has been described for volume estimation and characterisation of a tube scar. This is important for more accurate tube life assessments.
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