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Lube-Tech


Results and Discussion Group II Formulations


The use of AO is critical to the long term performance of an industrial turbine oil package where the fluid may be in service for several years. It is important that these lubricant/additives systems provide maximum protection and maintain durability of equipment that operates in a variety of environments and operating temperatures. To evaluate these AO, a long term test dry TOST (modified ASTM D943) was setup and run with the goal of lasting at least 5000 hours of service time. The objective was to try to optimise the AO additive type and dosage for each different base oil type in order to reach at least 5,000 hours of service time in the TOST testing.


In order to screen the performance of the Vanderbilt AO, twenty formulations were prepared using


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.120 page 2


ADPA, HP, DTC, and TD chemistries at different treat rates and combinations. Formulations are summarised in tables 1 and 4. As shown in these two tables (1&4) the twenty different formulations (10 formulations of Group I and 10 formulations of Group II) were mixed with at least two different AO and a standard ashless rust inhibitor and/or copper corrosion inhibitor (500 ppm). The treat rates of the AO combinations varied depending on the base oil type (Group I or II) and ranged from 0.37-0.7 wt%. The appearance of the formulation was noted at the beginning when it was made (9/3/2012), at two different intervals (4/10/13 & 12/26/13) and its final appearance (1/22/16). A failure of the fluid was noted by reaching a TAN >2.0 mgKOH/g in the dry TOST (modified ASTM D943). This typically occurred with a noticeable change in viscosity and appearance (precipitate and/or color).


Table 1. Group II AO Formulations and Appearance.


LUBE MAGAZINE NO.149 FEBRUARY 2019


27


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