Gas Turbine Series

The objective of this course is to draw attention to inspection requirements, which are similar for most types of gas turbines although mechanical details may be different. Upon completion of this course and associated workbook, the participant should understand and be able to apply the following concepts:

• Standard work practices
• Objectives of hot gas path inspection
• Components to be removed and inspected
• Preparation for work
• Need to support vertical joint
• Procedure for disassembly
• Lifting the shell
• Removal of transition pieces
• Removal of first and second stage upper nozzle assemblies
• Removal of upper first stage nozzle support ring
• Removal of upper second stage diaphragm
• Removal of interstage packing in the lower half second stage diaphragm
• Removal of first and second stage lower nozzle assembies by rolling
• Marking of components for identification
• Standard “left” or “right” identification
• Measuring clearances between rotating and stationary elements
• Cleaning and inspection of components
• Inspection requirements for nozzles, diaphragms, seals
• Dye penetrate test for cracking
• Major overhaul
• Lifting compressor upper shell
• Coupling removal
• Removal of exhaust frame and inlet casing
• Checking compressor clearances
• Disassembly of thrust and journal bearings
• Lifting the rotor
• Inspection requirements for rotor, bearings, buckets, blades, vanes, etc
• Reassembly
• Setting thrust bearing
• Setting packing seals
• Journal bearing contact check
• Spare parts requirements
• Need for manufacturer’s maintenance manual for specific machines