Inspection & Diagnostics
Know the Condition Before Making the Decision.
Inspection, measurement and diagnostic services for steam turbines, generators and associated systems — providing the technical basis for overhaul, repair and restoration decisions.
Condition Before Action
Inspection Turns an Overhaul Into an Engineering Process.
Dismantling reveals the equipment. Inspection and measurement reveal its condition. Those findings provide the basis for repair, adjustment, replacement and reassembly decisions.
Dimensional Inspection & Clearance Measurement
Critical dimensions and clearances are checked during overhaul to evaluate component condition and support accurate reassembly.
- Bearing clearance measurement
- Thrust clearance measurement
- Steam seal clearance measurement
- Flow-path clearance measurement
- Rotor position checks
- Component dimensional inspection
- Relevant installation clearances
- Final clearance verification
Rotor & Shaft Measurement
Rotor and shaft measurements help identify mechanical condition, geometric deviation and issues relevant to bearings, alignment and vibration.
- Rotor runout measurement
- Shaft journal measurement
- Journal surface inspection
- Coupling inspection
- Rotor position checks
- Shaft-line related measurement
- Relevant dimensional checks
Shaft Alignment
Alignment Connects the Entire Machine Train.
Turbine-generator alignment is evaluated as part of the complete shaft train rather than treating individual machines in isolation.
- Coupling alignment checks
- Shaft-line measurement
- Bearing-position related checks
- Relative position verification
- Alignment adjustment where required
- Final alignment verification
Bearing Condition Assessment
Bearing inspection combines visual condition, surface contact, clearances and shaft condition to support overhaul decisions.
- Journal bearing inspection
- Thrust bearing inspection
- Bearing surface condition
- Contact condition
- Clearance measurement
- Journal condition
- Wear / damage inspection
- Repair assessment
Blade & Flow-Path Inspection
Inspection of blades and flow-path components helps identify visible damage, deposits, erosion, abnormal wear and other conditions requiring further assessment.
- Blade visual inspection
- Blade surface condition
- Crack indications
- Erosion assessment
- Deposit assessment
- Diaphragm inspection
- Seal condition
- Flow-path component inspection
Non-Destructive Testing
NDT can be applied to critical turbine-generator components where required to identify surface or internal indications without damaging the component.
PT
Liquid Penetrant Testing
MT
Magnetic Particle Testing
UT
Ultrasonic Testing
NDT method and scope are selected according to component type, inspection findings and project requirements.
Vibration & Rotating Condition
What Happens in Operation Matters.
Vibration diagnostics and rotating-condition observations provide important information about the mechanical condition of the turbine-generator shaft train before and after overhaul. Vibration diagnostics helps identify unbalance, misalignment, bearing issues and other rotating-condition problems.
- Vibration measurement
- Bearing vibration observation
- Shaft vibration observation where applicable
- Speed-related behavior
- Trend comparison
- Startup vibration monitoring
- Operating-condition observation
Generator Electrical Testing
Electrical testing provides additional information about generator winding and insulation condition during overhaul.
Testing scope depends on generator type, equipment condition and project requirements.
Explore Generator Overhaul
Symptom-Based Diagnostics
When Operating Symptoms Point to Specific Issues
Some findings are identified during overhaul inspection. Others come from operating symptoms reported before or between outages. The following diagnostic services address common turbine-generator operating symptoms.
Main Steam Stop Valve Steam Leakage Diagnosis & Repair
Main steam stop valve internal leakage (seat leakage) or stem seal leakage can affect unit isolation, efficiency and safety. Diagnosis covers valve seat condition, stem seal integrity and internal component inspection. Repair scope is determined based on findings.
Bearing High-Temperature Troubleshooting
Elevated bearing temperatures can indicate lubrication issues, incorrect clearances, journal surface problems, contamination or alignment concerns. Troubleshooting combines operating data review with physical inspection during overhaul to identify the root cause.
Condenser Vacuum Troubleshooting & Air Ingress Diagnosis
Poor condenser vacuum reduces turbine efficiency and output. Vacuum troubleshooting covers condenser condition, air ingress paths, vacuum system integrity and associated equipment. Air ingress diagnosis identifies leakage sources that may not be visible during normal operation.
Rotor Dynamic Balancing
Rotor dynamic balancing is performed when vibration data indicates unbalance in the turbine rotor. The balancing method and acceptance criteria are selected according to rotor type, speed and applicable technical requirements. Balancing can be arranged through appropriate resources depending on rotor size and specifications.
From Data to Decision
Measurements Are Useful Only When They Lead to Decisions.
Accept
Condition acceptable for continued use.
Adjust
Adjustment required during reassembly.
Repair
Corrective work required before reassembly.
Replace
Replacement recommended based on condition and technical requirements.
Inspection findings are reviewed together with equipment condition, operating history, applicable technical requirements and overhaul scope before corrective actions are determined.
Defect & Finding Documentation
Significant findings identified during overhaul should be documented clearly so that technical decisions and corrective actions remain traceable.
Inspection Throughout the Overhaul
Before Overhaul
Understand operating condition
- Vibration
- Known problems
- Operating history
- Previous maintenance findings
During Overhaul
Understand internal condition
- Visual inspection
- Measurements
- NDT
- Electrical testing
- Defect assessment
After Overhaul
Verify restored condition
- Alignment
- Clearances
- Functional checks
- Vibration monitoring
- Testing
Before Overhaul
Understand operating condition
- Vibration
- Known problems
- Operating history
- Previous maintenance findings
During Overhaul
Understand internal condition
- Visual inspection
- Measurements
- NDT
- Electrical testing
- Defect assessment
After Overhaul
Verify restored condition
- Alignment
- Clearances
- Functional checks
- Vibration monitoring
- Testing
Inspection Coverage
Inspection Is Not the End
Find the Problem. Then Solve It.
Our inspection capability is integrated with overhaul execution, allowing findings to be translated directly into practical corrective actions.
Field Experience
Inspection Where It Matters Most.
Rotor Inspection
Bearing Measurement
Blade Inspection
Generator Inspection
Alignment
Equipment Assessment
Understand the Condition
Need to Know What Your Turbine-Generator Is Telling You?
Send us the equipment manufacturer, model, capacity, operating symptoms or vibration data, maintenance history, and your available shutdown window. Our team can review the condition and discuss the appropriate inspection scope.