Technical decision basis

Structured operating and risk assessment focused on decision point, verification and next step.
Summary
Several measured values are above action limits or require technical follow-up within the turbine, generator, gearbox, generator cooling and lubrication systems. The lubrication system should be verified first because low or uncertain oil pressure may affect several bearing positions at the same time.
Critical
Demo / anonymizedDemo plant - example report based on fictitious or anonymized measured values.
Risk level
Critical
Asset
AX-TG-101
Inspection date
2026-06-10
Report type
CSV-based trend review + technical risk assessment
Decision support
Critical decision support case
Top action
Verify lubrication system first: oil level, pump in operation, filter differential pressure and local manometer.
One or more values are above action limits, or several deviations interact in a way that may affect continued operation, start-up or machine safety.
Date2026-06-10
AssetAX-TG-101
Selected train profileSteam turbine + gearbox + electrical generator
TypeSteam turbine + gearbox + electrical generator
ComponentsSteam turbine, Gearbox, Electrical generator
Support systemsLubrication, Cooling system, Valves
Recommended operating statusContinued operation should only occur within confirmed operating limits. Load increase, release after overhaul or continued operation without follow-up is not recommended before critical systems and local measurements are verified.
SiteDemo site
Demo plantFictional or anonymized demo plant
CoverageWhole unit
Report ID-
Approval date2026-06-10
Risk levelCritical
Decision point
Should the unit remain in operation, run with limitations, be stopped for checks or wait for technical verification before release?
Preliminary recommendation
The unit should not be released for normal operation before lubrication system, critical bearing positions and local measured values are verified. Continued operation should only proceed within confirmed local operating limits and plant procedures until technical follow-up is completed.
Current condition
Elevated risk condition
Several deviations have been identified in lubrication, turbine, generator and/or gearbox. Lubrication should be verified first because uncertain oil pressure may affect several bearing positions at the same time.
Operational impact
Elevated risk of operational disturbance
Continued operation should only proceed within confirmed local operating limits and plant procedures until technical verification is completed. Load increase or release for normal operation is not recommended without follow-up of critical values.
Next step
Coordinate immediate technical follow-up.
Axerion can support verification, risk assessment and the next decision basis.
Final assessment
Critical
Several measured values are above action limits or require technical follow-up. Lubrication should be verified first because low or uncertain oil pressure may affect several bearing positions at the same time.
  • Lubrication: follow up oil pressure, pump status, oil level and filter differential pressure according to normal routine.
  • Electrical generator: follow up bearing and vibration values according to the normal control programme.
  • Cooling system: follow up cooling pressure, temperature and flow according to local operating instructions if relevant values exist.
  • Gearbox: check vibration pattern across several bearing positions and possible load/lubrication influence.
  • Valves: verify response, full stroke and stability at the current operating point.
Check first - in this order
Start with the highest technical risk. Confirm critical values locally before the unit is released or load increase is carried out.
  1. Lubrication Critical
    Technical reason
    Low or uncertain oil pressure may affect several bearing positions at the same time and should be verified before the next operating decision.
    Lubrication issue
    What to check
    • Check oil level, active pump and filter differential pressure in the same operating moment.
    • Verify bypass position, suction conditions and a local gauge/reference reading.
    • Confirm that the pressure drop is not caused by sensor error or a temporary transient.
    Recommended action
    Verify lubrication system first before release.
  2. Generator bearings Critical
    Technical reason
    High temperature and vibration at generator bearings may indicate cooling, lubrication, contact/rubbing or load/speed related influence.
    Generator bearing temperature/vibration pattern across DE/NDE.
    What to check
    • Confirm temperature and vibration at generator DE with a repeat measurement in the same operating mode.
    • Check oil film, local heat, DE/NDE deviation and any contact/rub.
    • Verify whether the level follows load, speed, warm-up or cooling influence.
    • Confirm temperature and vibration at generator NDE with a repeat measurement in the same operating mode.
    Recommended action
    Repeat measurement in the same operating mode and compare against local instruments.
  3. Turbine bearings Critical
    Technical reason
    High temperature and vibration at turbine bearings require verification of bearing condition, oil film and load/speed related influence.
    Turbine bearing temperature/vibration pattern across DE/NDE.
    What to check
    • Confirm temperature and vibration at turbine DE with a repeat measurement in the same operating mode.
    • Check oil film, local heat, DE/NDE deviation and any contact/rub.
    • Verify whether the level follows load, speed, warm-up or cooling influence.
    • Confirm temperature and vibration at turbine NDE with a repeat measurement in the same operating mode.
    Recommended action
    Repeat measurement in the same operating mode and compare against local instruments.
  4. Gearbox Warning
    Technical reason
    Vibration patterns across several bearing positions may indicate influence from lubrication, gear contact, alignment, backlash or load change.
    Gearbox bearing/vibration pattern across multiple bearing positions.
    Values behind the check
    • Gearbox DE1 bearing temperature: 93 °C
    • Gearbox DE2 bearing temperature: 91 °C
    • Gearbox NDE1 bearing temperature: 88 °C
    • Gearbox NDE2 bearing temperature: 86 °C
    • Gearbox vibration DE1: 6.9 mm/s
    • Gearbox vibration DE2: 6.4 mm/s
    • Gearbox vibration NDE1: 5.9 mm/s
    • Gearbox vibration NDE2: 5.5 mm/s
    What to check
    • Confirm temperature and vibration at gearbox DE and compare against the other gearbox bearing positions.
    • Check oil distribution, spray nozzles and local oil film on the output/NDE side.
    • Verify gear mesh, backlash and whether the level follows torque or load changes.
    • Confirm temperature and vibration at gearbox DE2 and compare against the other gearbox bearing positions.
    • Check oil distribution, spray nozzles and local oil film on the input/DE side.
    Recommended action
    Repeat measurement in the same operating mode and compare against local instruments.
Recommended operating status until verification is complete
Continued operation should only proceed within confirmed local operating limits and plant procedures. Load increase, release after overhaul or continued operation without follow-up is not recommended before lubrication system, critical bearing positions and local measured values are verified.
Data basis and data quality
Data sourceCSV export / trend data
Period2026-06-09 00:00 to 2026-06-10 00:00
Imported rows182
Reviewed measured values22
Other context valuesLoad: 23.8 MW, Speed: 3000 rpm
Reviewed parametersTurbine DE bearing temperature, Turbine NDE bearing temperature, Turbine vibration DE, Turbine vibration NDE, Generator DE bearing temperature, Generator NDE bearing temperature, Generator vibration DE, Generator vibration NDE, Cooling pressure, Generator cooling delta-T, Gearbox DE1 bearing temperature, Gearbox DE2 bearing temperature, Gearbox NDE1 bearing temperature, Gearbox NDE2 bearing temperature, Gearbox vibration DE1, Gearbox vibration DE2, Gearbox vibration NDE1, Gearbox vibration NDE2, Valve stroke, Valve opening time, Oil pressure, Oil temperature
Limits fromAxerion rules / not specified - verify against customer/OEM limits before operational use
Data qualityPartly complete time series
The dataset contains timestamps. Period and data points are based on available trend/CSV information.
Trend timeline
When did it start?
Lubrication - Oil pressure
First warning2026-06-09 12:00 · 1.75 bar
First action level2026-06-09 16:00 · 1.58 bar
Worst value2026-06-10 00:00 · 1.42 bar
First detected deviation: Lubrication - Oil pressure at 2026-06-09 16:00. Times are based on imported trend timestamps and must be verified against local historian data.
SystemMeasurementFirst warningFirst action levelWorst value
LubricationOil pressure2026-06-09 12:00 (1.75 bar)2026-06-09 16:00 (1.58 bar)2026-06-10 00:00 (1.42 bar)
LubricationFilter differential pressure2026-06-09 12:00 (0.95 bar)2026-06-09 20:00 (1.38 bar)2026-06-10 00:00 (1.45 bar)
LubricationBearing oil flow2026-06-09 12:00 (80)2026-06-09 20:00 (62)2026-06-10 00:00 (56)
TurbineTurbine DE bearing temperature2026-06-09 12:00 (93 °C)2026-06-09 16:00 (99 °C)2026-06-10 00:00 (105 °C)
TurbineTurbine vibration DE2026-06-09 12:00 (5.8 mm/s)2026-06-09 16:00 (7.3 mm/s)2026-06-10 00:00 (8.4 mm/s)
TurbineTurbine NDE bearing temperature2026-06-09 12:00 (89 °C)2026-06-09 20:00 (99 °C)2026-06-10 00:00 (101 °C)
Assessment uncertainty
Low to medium - the assessment is based on available trend data but must still be verified against local measured values and site routines.
Key values behind the assessment
Selected measured values that support the risk class, check order and recommended next steps.
System Measurement point Measured value Monitoring limit Action limit Status Comment
Turbine Turbine bearing DE C 105 °C >= 85 °C >= 95 °C Action required Above action limit. Verify locally.
Turbine Turbine bearing NDE C 101 °C >= 85 °C >= 95 °C Action required Above action limit. Verify locally.
Generator Generator bearing DE C 106 °C >= 85 °C >= 95 °C Action required Above action limit. Verify locally.
Generator Generator bearing NDE C 103 °C >= 85 °C >= 95 °C Action required Above action limit. Verify locally.
Generator Cooling Cooling pressure bar 1.36 bar < 1.5 bar < 1 bar Warning Above monitoring limit. Follow up technically.
Gearbox Gearbox vibration DE1 mm/s 6.9 mm/s >= 3.5 mm/s >= 4.5 mm/s Action required Above action limit. Verify locally.
Gearbox Gearbox vibration DE2 mm/s 6.4 mm/s >= 3.5 mm/s >= 4.5 mm/s Action required Above action limit. Verify locally.
Valves Valve stroke mm 18.8 mm >= 15 mm >= 20 mm Warning Above monitoring limit. Follow up technically.
Valves Open time s 3.1 s >= 2.5 s >= 4 s Warning Above monitoring limit. Follow up technically.
Lubrication Oil pressure (final) 1.42 bar < 2 bar < 1.6 bar Action required Above action limit. Verify locally.
Lubrication Oil temp C 90 °C >= 80 °C >= 90 °C Action required Above action limit. Verify locally.
Contacts and next step
RecipientDemo plant
Axerion contactAxerion QA
Recipient roleOperations manager
Next agreed stepCoordinate immediate technical follow-up. Axerion can support verification, risk assessment and the next decision basis.
Limitation and responsibility note
The assessment is based on the available dataset at the time of reporting. The report is a technical decision support document and does not replace the plant's operating instructions, protection systems, OEM requirements, safety routines or the decision of the responsible operations management. The conclusion may need to be revised if new measurements, images, operating data or inspection findings are added.
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