By M N Rao
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This oil had the highest initial RPVOT value in the experiment. The observations made from this sample are: • No measurable change in acid number or RPVOT. 38 OXIDATION AND THE TESTING OF TURBINE OILS TABLE 5—Analytical results from Sample D. 0 Performance Tests … … FIG. 12—FTIR: amine antioxidant depletion. LIVINGSTONE ET AL. ON CHANGES IN TURBINE OILS 39 FIG. 13—FTIR: amine antioxidant depletion. FIG. 14—FTIR: evidence of degradation byproducts. 40 OXIDATION AND THE TESTING OF TURBINE OILS FIG.
In practice such information can be of limited use from an OCM perspective; it needs to be emphasized that frequently no simple linear correlation exists between the quantity of remaining unused antioxidant and the oxidative stability of the oil. This is because as each antioxidant functions it can transform into numerous chemical intermediates; some of these intermediates can be more potent antioxidants than the original starting material, and because they are chemically different to the starting antioxidants may not be detected as readily without detailed complex analysis.
This test was originally developed to determine the resistance of aircraft turbine engine oils to oxidation and corrosion, and has previously been included in OEM specifications for industrial gas turbines ͓9͔. It is the most severe in temperature terms ͑175° C͒ laboratory oxidation test used for turbine oils, and involves air being passed through the oil for 72 h in the presence of five catalytic metal coupons. At the end of the test period three criteria are assessed to rank the oils oxidative stability, these are percent viscosity increase, acid number increase, and sludge formation.
Air Pollution by M N Rao