High temperature gas turbine applications, such as GE Frame 7 turbines, place high demands on the thermal and oxidative stability of turbine oils. Successful products not only start with a superior quality basestock, but must also employ a carefully balanced, low volatility, thermally stable additive system. The excellent properties of Group II and Group III basestocks such as high viscosity index, low volatility, superior oxidative resistance, and high thermal stability make them ideal choices for this service. Turbine oils formulated with severely hydrocracked Group II and Group III basestocks offer performance on par with those formulated with synthetic hydrocarbons.
A brief review of the role and requirements of modern turbine oils is given together with a more extensive look at current basestock technology versus traditional solvent refined basestocks. Additive selection for high temperature turbine oils is also discussed.
In addition, data presenting the impact of poly-cycloparaffin content on the stability of highly saturated Group II and Group III basestocks is presented. The oxidative stability of additized basestocks increases as poly-cycloparaffin content decreases.
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