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Damage example cases of pigtails under high temperature and pressure. Also: the technique for the remaining life assessment of pigtails - based on the relation between OD change and life consumption.
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Long-term exposure of superheater tubes to normal operating conditions results in gradual changes inthe alloy's microstructure and properties eventually leading to creep cracking and failure. The methodused most frequently to predict the remaining life of these tubes is based on curves showing the variationof the Larson-Miller parameter (LMP) with stress needed for creep rupture. This method works well forGrades such as T11 and T22 alloy steels since the tube metal temperature can be reasonably wellestimated based on the ID scale thickness.