Borescope Inspections (BSI)
A borescope inspection program enables the operator to evaluate the condition of internal components without having to disassemble or remove the casing. By performing this lower level maintenance, the operator can anticipate future maintenance needs, track the deterioration of internal parts, and assess any damage caused by foreign object debris or component failure. This proactive approach helps to minimize disruptions and ensure that the equipment is operating at its best.
Combustion Inspections (CI)
A combustion inspection involves a brief disassembly of certain components that are known to be prone to wear and tear in a well-maintained system. These parts include fuel nozzles, liners, transition pieces, crossfire tubes and retainers, ignitor assemblies, flame detectors, and combustion flow sleeves. By focusing on these specific components, we can identify and address any issues before they escalate and potentially cause damage to downstream parts such as turbine nozzles and buckets. This proactive approach helps to extend the overall lifespan of the system.
Hot Gas Path Inspections (HGPI)
The Hot Gas Path Inspection (HGPI) is a comprehensive examination of components that are subjected to high temperatures from the combustion process. In addition to the components covered in the Combustion Inspection (CI), the HGPI includes a detailed inspection of turbine nozzles, stator shrouds, and turbine buckets. To perform this inspection, the top half of the turbine shell must be removed and certain transition pieces and first-stage turbine nozzles must be removed (removal of the second and third stage turbine nozzle assemblies may be optional depending on the results of visual observations, clearance measurements, and other required inspections). The buckets can typically be inspected in place. Coatings are an essential part of protecting the buckets, which operate at high temperatures.
Major Inspections (MI).
The Major Inspection (MI) is a thorough examination of all internal rotating and stationary components from the inlet to the exhaust of the machine, including the diffuser. This inspection covers all major flange-to-flange components of the gas turbine that may experience deterioration during normal operation. In addition to the elements covered in the Combustion Inspection (CI) and Hot Gas Path Inspection (HGPI), the MI requires the complete flange-to-flange of the gas turbine to be opened to the horizontal split line. To access all the internal components, it is necessary to remove the upper casing, which provides access to the compressor rotor and stationary compressor blading, as well as the bearing assemblies. With the upper casings and rotor removed, it is possible to perform various visual checks and measurements and to carry out any necessary actions based on the results of these inspections. The MI also allows for the replacement of components that have reached the end of their lifespan.
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