Damage assessment of service exposed reactor and distillation column materials of a petrochemical industry

This work highlights quantification of normalized creep damage incorporating uncertainty with respect to Larson–Miller parameter (LMP) at various intervals (with service exposure) of a 55 years service exposed reactor and distillation column materials of a petrochemical industry. Usually, remaining life is predicted from extrapolation of stress vs. LMP plot without incorporating the uncertainty involved in calculation of LMP values. Uncertainty involved in calculating LMP value has been given prime importance in this work because it is a function of rupture time. Variability of normalized creep damage for reactor and column materials is well approximated with the aid of Weibull distribution. As expected, it is observed that the distributions shift towards the higher range of damage with increase in service exposure time.