Значение и использование

This bench test method is intended to produce comparable oil aging characteristics to those obtained with ASTM TMC Sequence IIIGA matrix reference oils 434, 435 and 438 after aging in the Sequence IIIG engine test.

To the extent that the method generates aged oils comparable to those from the Sequence IIIG engine test, the measured increases in kinematic and MRV viscosity indicate the tendency of an oil to thicken because of volatilization and oxidation, as in the Sequence IIIG and IIIGA (see Appendix X1 in Test Method D 7320) engine tests, respectively.

This bench test procedure has potential use in specifications and classifications of engine lubricating oils, such as Specification D 4485.

Область применения

1.1 This test method describes a bench procedure to simulate the oil aging encountered in Test Method D 7320, the Sequence IIIG engine test method. These aged oils are then tested for kinematic viscosity and for low-temperature pumpability properties as described in the Sequence IIIGA engine test, Appendix X1 of Test Method D 7320.

1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.2.1 Exceptions—There are no SI equivalents for some apparatus in Section 6, and there are some figures where inch units are to be regarded as standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in Sections 7 and 8.

1.4 This test method is arranged as follows:

Section Scope1 Reference Documents2 Terminology3 Summary of Test Method4 Significance and Use5 Apparatus6 Reagents and Materials7 Hazards8 Reference Oil Testing and Test Stand Calibration9 Procedure10 Cleaning11 Calculations and Determination of Test Results12 Report13 Precision and Bias14 Keywords15 Annexes Reaction VesselAnnex A1 Reaction Vessel HeadAnnex A2 Reaction Vessel-to-Head SealAnnex A3 Agitator Turbine BladeAnnex A4 Agitator Packing GlandAnnex A5 Nitrogen Dioxide Graduated TubeAnnex A6 Vacuum System PlumbingAnnex A7 Vacuum Trap CondensersAnnex A8 Setting the Vacuum Control ValveAnnex A9 Appendixes Sample Preparation and AdditionAppendix X1 Charging the Liquid Nitrogen DioxideAppendix X2 Nitrogen Dioxide Precision Needle ValveAppendix X3 Example of an Assembled ROBO ApparatusAppendix X4 Information Package to Aid Setting Up a New Robo ApparatusAppendix X5