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newsPower Generation Turbines

Power Generation Turbines

​​​​​Types of Turbine


​Steam​Combustion generates steam which turns turbines
​GasCombustion creates power which turns turbines
​Combined CycleGas first, then exhaust creates steam






Steam Turbine



Turbine Oil Functions

  • Lubricate journal and thrust bearings
  • Provide effiencient cooling
  • Prevent sludge
  • Prevent corrosion
  • Sometimes hydraulic and gear


Oil Characteristics

​Viscosity ​Higher Speeds (> 3,000 RPM) needs ISO 22-32
Lower Speeds (< 3,000 RPM) needs ISO 32-68
​Viscosity Index ​Min 95
Max 115
​Demulsibility of Water ​Steam leaks
Condensation in reservior
Faulty cooling systems
​Oxidation Stability ​RPVOT
Highly refined base oils


ASTM D2272 RPVOT Significance and Use

  • 4.1 The estimate of oxidation stability is useful in controlling the continuity of this property for batch acceptance of production lots having the same operation. It is not intended that this test method be a substitute for Test Method D943 or be used to compare the service lives of new oils of different compositions.
  • 4.2 This test method is also used to assess the remaining oxidation test life of in-service oils.

      (RPVOT = Rotating Pressure Vessel Oxidation Test)


ASTM D943 TOST Significance and Use

  • This test method is widely used for specification purposes and is considered of value in estimating the oxidation stability of lubricants, especially those that are prone to water contamination.
  • It should be recognized, however, that correlation between results of this method and the oxidation stability of a lubricant in field service may vary markedly with field service conditions and with various lubricants.
  • The precision statement for this method was determined on steam turbine oils.

      (TOST = Turbine Oil Stability Test)


Failure Modes

​FoamAir intake from pumps
High return pressure
Can damage pumps
​Rust and CorrosionWater contamination
Metal contaminants


System Flushing and Filtration

​Initial ChargeHigh velocity
Filtration to ISO 17/16/14
Heating and cooling cycles
​RechargeUse flushing oil
Vibration of lines and temperature cycling
Filtration to ISO 17/16/14


1-5 year Oil Life

  • Suitability for Continued Use (Annual)
  • Viscosity ASTM D445
  • RPVOT ASTM D2272
  • Water by Karl Fischer Titration ASTM D1744
  • Acid Number ASTM D664
  • ISO Cleanliness Code 4406
  • Rust ASTM D665 A
  • Demulsibility ASTM D1401
  • Foam ASTM D892 Sequence 2
  • ICP Metals



  • Clean oil decreases the lifetime operation expense of a piece of equipment.
  • An ISO code is a set of three reference numbers separated by slash marks and refer to the number of particles of certain sizes in 100 milliliters of a fuel or oil.

Greater than 4μm / Greater than 6μm / Greater than 14μm
ISO 22/21/18