Condition based maintenance and borescope inspection of aeroderivative gas turbine

One of the primary tenets of the reliability centered maintenance (RCM) approach is that maintenance activities should be focused toward preserving equipment functionality. It follows that the first step in analyzing a particular piece of equipment is to identify the functional failures and describe the ways that the equipment may fail to perform its intended functions. Maintenance funding can then be aligned to those failures that have the highest rate and consequence. Generally speaking, most turbine maintenance programs are not developed around a risk based approach, but is rather tailored towards original equipment manufacture (OEM) guidance on a limited number of pieces of equipment within a package. While this may enable a system, or multiple systems to run reliably, it does not optimize the overall plant reliability as a function of maintenance expenditure. As an example, the gas turbine combustion and hot section account for almost 80% of a typical maintenance budget, while being one of the smallest contributors to unplanned down time. This paper gives details related to gas turbine maintenance to ensure safe and reliable operation, such as condition based maintenance, L1 borescope inspection and L2 inspection. Also investigates high temperature observed on different nozzles on combustion chamber.