The fluctuation in temperature and pressure in boiler parts subjected to creep and fatigue stress and also fuel burnt and steam generation leads to corrosion in various areas in the boiler. Residual stress during manufacturing, the vibration due to flow over the tube, mechanical vibrations, erosion due to the abrasive nature of the fuel, does occur in boilers. All of the above, individually or combined lead to material degradation of different magnitude and will lead to failure. It also leads to reduction of creep life of superheater tubes and results in the necessity of superheater repair every 4–5 years with replacement of up to 30–50% of tubes. The remnant life assessment (RLA) of boilers predicts accurately the remaining life of high temperature tubes allows reducing the amount and cost of repair. The method of assessment of remaining life for superheater and reheater steel tubes operating in conditions of intensive high-temperature corrosion is presented in this paper. The method is based on measurements of tube wall thickness and corrosion resistance of particular steel.
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