| OELCHECK test instrument: | TOPP test (Turbine Oil Performance Prediction) (TOST apparatus, viscosity, acid number, RPVOT, MPC, Ruler after aging) |
| Sample quantity: | 2.5 l |
| Unit: | N/A |
| Test result: | Viscosity, acid number, RPVOT, MPC, Ruler after aging |
| Analysis for: | Fresh turbine oils for predicting oxidation stability |
| Brief description: | Four subsamples of the fresh oil are artificially aged in the presence of a catalytic coil and air at a flow rate of 3 L/h for 3, 6, 9, and 12 weeks, respectively. After this pretreatment, viscosity, acid number, RPVOT, MPC, and RULER are determined on the aged samples. The same parameters are measured on a fifth, unaged sample as reference values. |
| Statement: | The test is used to assess the suitability and approval of turbine oils for service. The pretreatment is intended to accelerate the aging expected during actual operation. Subsequently, typical aging and deposit formation parameters are determined. All methods are already established and standardized but have so far been used for used oils to evaluate the aging that occurred during real service. Oils that show only minimal aging or tendency to deposit formation even after the longest pretreatment are expected to be more resistant in real operation. OEMs can also define limit values for individual aging stages and analytical parameters for lubricant approval. |
| Underlying test standard: | In-house method |
