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Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer (Includes all amendments and changes 1/21/2022).Přeložit název
NORMA vydána dne 1.12.2021
Označení normy: ASTM D7945-21a
Datum vydání normy: 1.12.2021
Kód zboží: NS-1048069
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
constant pressure viscometer, density, kinematic viscosity, viscosity,, ICS Number Code 75.180.30 (Volumetric equipment and measurements)
|Significance and Use|
5.1Many petroleum products are used as lubricants and the correct operation of the equipment depends upon the appropriate viscosity of the liquid being used. In addition, the viscosity of many petroleum fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate determination of viscosity is essential to many product specifications.
5.2Density is a fundamental physical property that can be used in conjunction with other properties to characterize both the light and heavy fractions of petroleum and petroleum products and in this test method is used for the calculation from dynamic to kinematic viscosity.
1.1This test method covers the measurement of dynamic viscosity and density for the purpose of derivation of kinematic viscosity of petroleum liquids, both transparent and opaque. The kinematic viscosity, ?, in this test method is derived by dividing the dynamic viscosity, ?, by the density, ?, obtained at the same test temperature. This test method also calculates the temperature at which petroleum liquids attain a specified kinematic viscosity using Practice .
1.2The result obtained from this test method is dependent upon the behavior of the sample and is intended for application to liquids for which primarily the shear stress and shear rate are proportional (Newtonian flow behavior).
1.3The range of kinematic viscosity covered by this test method is from 0.5mm2/s to 1000mm2/s in the temperature range between 40 C to 120 C; however the precision has been determined only for fuels and oils in the range of 2.06mm2/s to 476mm2/s at 40 C and 1.09mm2/s to 107mm2/s at 100 C (as stated in Section on Precision and Bias). For jet fuels, the precision of kinematic viscosity has been determined in the range of 2.957mm2/s to 5.805mm2/s at 20C and 5.505mm2/s to 13.03mm2/s at 40C (as stated in Section on Precision and Bias), and the precision of the temperature at 12mm2/s (cSt) has been determined in the range of 38.3C to 58.1C (as stated in Section on Precision and Bias). The precision has only been determined for those materials, viscosity ranges, and temperatures as indicated in Section on Precision and Bias. The test method can be applied to a wider range of materials, viscosity, and temperature. For materials not listed in Section on Precision and Bias, the precision and bias may not be applicable.
1.4The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
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