Auxiliary System Services
Auxiliary System Overhaul
Inspection, overhaul and restoration of critical auxiliary systems supporting reliable turbine-generator operation.
Inspection scope may include steam turbine governor maintenance, turning gear repair, lubricating and jacking oil systems, oil deflector rings, pumps, and condenser/vacuum equipment. Final scope follows the unit design and inspection findings.
Supporting the Main Machine
Reliability Is a System.
A turbine and generator cannot operate reliably if their supporting systems are not functioning correctly. During an overhaul, critical auxiliaries should be inspected and restored together with the main unit according to project requirements and equipment condition.
STEAM TURBINE + GENERATOR
Lubricating Oil System
Inspection, maintenance and troubleshooting of the lubricating and control oil system helps ensure stable lubrication, bearing protection and reliable turbine-generator operation. Oil system troubleshooting covers abnormal pressure, contamination, leakage and flow issues identified during operation or overhaul.
- Oil tank inspection
- Lubricating oil piping inspection
- Main / auxiliary oil pump inspection
- Filters and strainers
- Coolers where applicable
- Oil leakage inspection
- Relevant valves
- Oil-system cleaning
- Oil circulation / flushing where required
- System restoration and operational checks
Jacking Oil System
The jacking oil system supports the turbine-generator rotor during low-speed operation and turning conditions and requires reliable pump and hydraulic performance.
- Jacking oil pump inspection
- Pump condition assessment
- Relevant piping inspection
- Valves and connections
- Leakage inspection
- Pressure-related checks
- System cleaning
- Functional verification
Oil Purification & Oil Condition
Clean Oil Protects Critical Components.
Oil condition directly affects bearing life, component wear and overall turbine-generator reliability. Oil purification and filtration are integral to the auxiliary system overhaul scope.
Pumps & Rotating Auxiliaries
Inspection and overhaul of critical pumps associated with turbine-generator auxiliary systems.
Representative Equipment
Typical Activities
Condenser & Vacuum Systems
Condenser and vacuum-system condition directly affects steam turbine operating conditions and overall unit performance.
- Condenser inspection
- Internal condition inspection
- Tube-related inspection
- Water-side / steam-side condition assessment
- Leakage inspection
- Vacuum-related equipment inspection
- Relevant valves and connections
- Cleaning where required
- Functional verification
Auxiliary Valves
Inspection and overhaul of valves associated with turbine-generator auxiliary systems help maintain proper flow, isolation and system control.
- Valve dismantling
- Internal inspection
- Seat inspection
- Stem inspection
- Seal / packing inspection
- Cleaning
- Repair / restoration
- Reassembly
- Leakage / functional checks where applicable
Note: Main Steam Valve and Governing/Control Valves belong primarily to the Steam Turbine Overhaul scope. This section covers valves associated with auxiliary systems — oil, vacuum, drainage and related services.
Instruments & Control Components
Relevant instrumentation and control components associated with auxiliary systems are inspected and verified as part of system restoration.
Governing System Maintenance
Governing system maintenance covers inspection, functional verification and troubleshooting of speed governing components, actuators, LVDTs, valve spools and related hydraulic circuits. Proper governing function is essential for stable turbine operation and load control.
Turning Gear (Barring Gear) Repair
The turning gear (barring gear) maintains slow rotor rotation during cooldown and startup. When the turning gear exhibits abnormal noise, vibration, engagement failure or gear wear, repair and restoration work is performed during the overhaul to restore reliable operation.
- Gear and pinion inspection
- Bearing and bush inspection
- Engagement mechanism check
- Abnormal noise diagnosis
- Motor / drive inspection
- Lubrication check
- Functional verification after repair
Related: Turning gear operation is also verified during testing and commissioning as part of pre-startup checks.
Bearing Oil Deflector Inspection & Repair
Turbine-generator bearing oil deflectors (oil deflector rings / oil retaining rings) help prevent oil from migrating along the shaft into areas where it should not be. During overhaul, oil deflectors are inspected for damage, wear, looseness or incorrect positioning. Repair or replacement is performed where required to restore proper oil containment.
Don't Look at Components in Isolation.
Auxiliary-system reliability depends not only on individual equipment condition but also on how pumps, piping, valves, instrumentation and controls perform together as a complete system.
During overhaul, the entire auxiliary system — not just individual components — is evaluated and restored to support reliable turbine-generator operation.
Repair & System Restoration
Based on inspection findings, required repair, adjustment or component replacement is completed before the auxiliary system is restored for operation.
Functional Testing
Equipment Repaired. System Verified.
After restoration, relevant auxiliary systems are checked as complete operating systems before turbine-generator return to service.
READY TO SUPPORT THE MAIN UNIT
Auxiliary System Overhaul Scope
One Overhaul System
Main Equipment and Auxiliaries Work Together.
COMPLETE TURBINE-GENERATOR OVERHAUL
Parts Support
Parts When the Overhaul Needs Them.
Replacement components and overhaul-related spare parts can be identified and supplied according to equipment information and actual inspection findings.
Explore Spare PartsYour Next Overhaul
Include the Auxiliaries in Your Overhaul Plan.
Send us the turbine-generator model, capacity, auxiliary equipment details, current symptoms or operating issues, and your planned shutdown window. Our team can review the requirements with you.