Turbine Oil Analysis


Turbine lube-oil systems are designed to cool bearings, flush contaminants away from rotating parts, prevent leakage of gases, provide hydrostatic lift for shafts and actuating valves in the hydraulic circuit and protect lube-system internals. Turbine oil formulations must handle large temperature fluctuations and the ingression of contaminants such as dirt and water. Monitoring in-service turbine oil condition for deterioration and degradation can significantly extend the life of both the lubricant and the turbine.

To help users understand how turbine oils deteriorate, Bureau Veritas has developed VitalPoint® – a series of four test packages for monitoring the condition of in-service turbine oils. With VitalPoint®, Bureau Veritas can show you how to implement a meaningful turbine oil analysis program to maximize service life.


Turbine Oil Analysis – The VitalPoint Difference

Bureau Veritas Inc. Turbine Oil Analysis | Total Lubricant Assessment (TLA)

Total Lubricant Assessment ( TLA® )

This package covers the majority of the testing outlined in the TOQ®, in addition to determining the varnish potential, additive levels and degradation mechanisms. Each report includes customized, detailed interpretations and recommended actions.

Bureau Veritas Inc. Turbine Oil Analysis | Control Fluid Assessment CFA

Control Fluid Assessment ( CFA® )

The most comprehensive test package available for control fluids (fire-resistant fluids). Fire-resistant fluids can remain in service for many years with the proper maintenance.

Bureau Veritas Inc. Turbine Oil Analysis | Turbine Oil Quality (TOQ)

Turbine Oil Quality ( TOQ® )

Modeled from the test recommendations in ASTM D4378 for semi-annual to annual sampling intervals.

Bureau Veritas Inc. Turbine Oil Analysis | Turbine Oil Monitoring (TOM)

Turbine Oil Monitoring ( TOM® )

Modeled from the test recommendations in ASTM D4378 for monthly to quarterly sampling intervals.

Bureau Veritas Inc. Turbine Oil Analysis | QSA Complete

QSA® Complete

QSA-logo-smallA testing package designed to assess the varnish potential of a turbine oil in addition to several other important oil quality parameters.



Recommended Packages & Sampling Frequency

Recommended sampling frequency is based on the type of turbine (Gas or Steam) and length of lubricant service

Gas turbine recommended sampling frequency

Length of Service Recommended Package
New Oil (Prior to installation) TOQ® / CFA®
New Oil Change (Prior to installation) TOQ® / CFA®
During first 6 months (every 500 hrs.) TOQ® / CFA®
In-service (every 500 hours) TOM® / QSA®
In-service (every 1500-2000 hrs.) TOQ ®/ TLA® / CFA®

Steam turbine recommended sampling frequency

Length of Service Recommended Package
New Oil (Prior to installation) TOQ® / CFA®
New Oil Change (Prior to installation) TOQ® / CFA®
During first 12 months operation (monthly) TOM® / QSA®
During first 12 months operation (quarterly) TOQ ®/ QSA®
In-service (quarterly) TOM® / QSA®
In-service (annually) TOQ® / TLA® / CFA®

Additional Sampling Considerations

Condition Recommended Package
Evidence of Varnish QSA® / TLA®
Valve Sticking QSA® / TLA®
Poor Heat Exchanger Performance QSA® / TLA®
Poor Water Separability TOQ® / TLA®
Inefficient Performance of Water Coalescers TOQ® / TLA®
Introduction of New Contamination Control Technology QSA® / TLA®
Measurement of Varnish Removal QSA® / TLA®
Rapid Color or Odor Change TLA®