Decommissioning Activities

Recording of operational values during run-down:

• Shaft vibrations
• Absolute and differential expansions Eccentricity
• Turbine shaft position
• White metal bearing temperatures Bearing oil pressures
• Run-down time from barring

Disassembly Activities

High-Pressure (HP&IP) Turbine

• Removal of instrumentation (e.g., diff & absolute expansion probes, thermocouples).
• Marking of valve reference positions.
• Measuring of turbine cold datum sizes.
• Bolt heating and removal of the top outer and inner casings.
• Removal of diaphragms, gland carriers, and rotors.
• Measuring and measuring of shaft axial and radial clearances.
• Removal of the bottom and top half components.

Low-Pressure (LP) Turbine

• Removal of cross-over pipes, gland boxes, and exhaust hoods.
• Removal of the top and bottom inner casings.
• Dismantling and removal of diaphragms and diaphragm carriers.
• Removal of LP rotors.

Centerline Work

• Removal of pedestal instrumentation.
• Opening and removal of coupling guards and pedestal covers.
• Removal of top and bottom half bearings and oil baffles.
• Measuring and recording of rotor running positions.
• Recording of shaft concentricity and alignment.
• Splitting of coupling.

Turbine Valves (Emergency Stop Valves (ESV), Control Valves (CV) and LP/IP Bypass)

• Recording of stroke checks.
• Removal of servo couplings, heat shields and oil pipes.
• Removal and recording of servo motor pretension.
• Stripping of valve internals.

Servo Motors

• Stripping of servo motors for inspection.
• Removal of power and control blocks.
• Removal of Moog control valves.
• Removal of power pistons and spindles.