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Pumping Viscosity by Mini-Rotary Viscometer : Critical Aspects / KO. Henderson

Conference Author
Low Temperature Lubricant Rheology Measurement and Relevance to Engine Operation (1991 : Austin, TX)
Physical Description
1 online resource (13 pages) : illustrations, figures, tables
Additional Creators
Henderson, KO., American Society for Testing and Materials, and ASTM International
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Summary
The current ASTM Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature (D4684-89) was designed to cool an engine oil at a rate that will maximize its tendency to form a flow limiting structure. The cooling program development work with the Pumpability Reference Oils (PRO) demonstrated that temperature control and cooling rate could greatly effect the observed viscosity of the test oil. By utilizing this method, all oils with known field problems are identified by exhibition of a yield stress greater than 35 Pa, and/or excessive viscosity at the appropriate test temperature. During the evaluation of cooling rates, it was found that small differences in test temperature resulted in large differences in observed viscosity of temperature sensitive engine oils. This paper shows the importance of closely monitoring and controlling the cooling rate as well as the final test temperature. Inaccuracy of temperature measurement was the largest contributor to measurement error in determining pumping viscosity.
Dates of Publication and/or Sequential Designation
Volume 1992, Issue 1143 (January 1992)
Subject(s)
Other Subject(s)
ISBN
9780803152014 (e-ISBN)
9780803114388
0803114389
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 11.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1992. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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