Gas turbine Compressor GE Maintenance overhauling👌

Summary

Key Points

• A major inspection combines combustion and hot‑gas‑path inspections with a full disassembly of the compressor and turbine, requiring removal of rotors, casings, and the exhaust frame. 0:19
• Proper rigging, jacking, and protective covering are essential before lifting upper half casings and accessing the turbine compartment roof and sidewalls. 0:58
• The load coupling and its guard must be carefully removed using rigging to prevent tilting and shifting, and the accessory drive coupling condition is recorded. 2:48
• After removing turbine nozzles and diaphragms, precise clearance measurements are taken for both turbine and compressor components, and thrust bearing pads are inspected for thickness and taper. 3:21
• Journal bearings are examined by checking outer and inner diameters, scoring, wear, and seal clearances, with new bearings verified against manufacturer specifications. 5:28
• The one‑piece rotor, containing compressor and turbine wheels, is lifted according to its center‑of‑gravity diagram, inspected for journal wear, seal land condition, and blade erosion, and cleaned with solvents or blasting as needed. 5:52
• Blades and stator vanes are cleaned, inspected for corrosion, erosion, and cracks (using liquid penetrant), and any faulty parts are replaced before reassembly. 8:28
• Refurbished turbine buckets are weighed and matched to specific slots using a computer program to balance the rotor, and compressor blades are installed after cleaning and stoning mating surfaces. 9:58
• Auxiliary equipment such as the gearbox, generator bearings, slip rings, torque converter, and atomizing‑air‑compressor motor are also inspected, overhauled, and calibrated during the major overhaul. 11:21
• Effective spare‑parts management, based on criticality, lead time, wear rates, and turbine serial numbers, is emphasized to minimize outage time and ensure correct parts are stocked. 13:03