An overhaul is understood to be a function and safety inspection (examinations, tests, measurements) and the resulting corrective work (repair, replacement) on site or works. Normally an minor overhaul of the turbine plant is carried out at intervals of between 2 and 4 years, and major overhaul must be carried out six(6) years to ten (10) years. The determination of the overhaul intervals depends among others on the type of operation (daily start-up and shut-down or continuous operation), the steam quality and the degree of monitoring carried out. There are different approaches, methodologies, and/or criteria utilizing the factors of influence above to determine acceptable major overhaul intervals when large size turbines are involved and large overhaul intervals are desired. a case-by-case basis based on the following factors of influence: