Abstract
Steam piping is one of the major components of power generation plant because of its use in conveying steam from the boiler to the turbines compartment. Over time, these pipings are subjected to diverse operating conditions in an attempt to meet the daily electricity demand. Hence, the useful creep life of the piping is drastically affected. In this study, finite element technique was used to investigate the influence of diverse operating cycles on the useful life of P92 steam piping. Faster stress relaxation with a characteristic higher creep strain was observed in the steady-state analysis as compared to those involving daily cycles. However, the rate of creep damage accumulation and the computed useful life under the different operating conditions computed using fe-safe/Turbolife software show that any form of daily shift has a detrimental effect on the useful life of steam piping.
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