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Standard Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique
Automatische name übersetzung:
Standardtestverfahren für Niedertemperatur, niedriger Scherrate, Viskosität / Temperaturabhängigkeit der Schmieröle Mit einem Temperatur Scanning-Technik
NORM herausgegeben am 1.9.2013
Bezeichnung normen: ASTM D5133-13
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.9.2013
SKU: NS-29964
Zahl der Seiten: 13
Gewicht ca.: 39 g (0.09 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
borderline pumping temperature, critical pumpability temperature, critical pumpability viscosity, engine oil, gelation, Gelation Index, Gelation Index temperature, low-temperature engine oil pumpability, low-temperature rheology, Scanning Brookfield technique, temperature-scanning technique, viscosity, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||
5.1 Significance of Low-Temperature, Low Shear Rate, Engine Oil Rheology—The low-temperature, low-shear viscometric behavior of an engine oil determines whether the oil will flow to the sump inlet screen, then to the oil pump, then to the sites in the engine requiring lubrication in sufficient quantity to prevent engine damage immediately or ultimately after cold temperature starting. 5.1.1 Two forms of flow problems have been identified,5.2 Significance of the Test Method—The temperature-scanning technique employed by this test method was designed to determine the susceptibility of the engine oil to flow-limited and air-binding response to slow cooling conditions by providing continuous information on the rheological condition of the oil over the temperature range of use.4 ,5.3 Gelation Index and Gelation Index Temperature—This test method has been further developed to yield parameters called the Gelation Index and Gelation Index temperature. The first parameter is a measure of the maximum rate of torque increase caused by the rheological response of the oil as the oil is cooled slowly. The second parameter is the temperature at which the Gelation Index occurs. |
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1. Scope | ||||||
1.1 This test method covers the measurement of the apparent viscosity of engine oil at low temperatures. 1.2 A shear rate of approximately 0.2 s-1 is produced at shear stresses below 100 Pa. Apparent viscosity is measured continuously as the sample is cooled at a rate of 1°C/h over the range −5 to −40°C, or to the temperature at which the viscosity exceeds 40 000 mPa·s (cP). 1.3 The measurements resulting from this test method are viscosity, the maximum rate of viscosity increase (Gelation Index), and the temperature at which the Gelation Index occurs. 1.4 Applicability to petroleum products other than engine oils has not been determined in preparing this test method. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. |
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2. Referenced Documents | ||||||
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