2013 Edition, October 1, 2013
Standard Test Method for Measuring Apparent Viscosity at High-Temperature and High-Shear Rate by Multicell Capillary Viscometer
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Revision F16, March 23, 2016
INDUSTRIAL GEAR LUBRICATION
1988 Edition, 1988
DESIGN BASIS FOR PROTECTION OF LIGHT WATER NUCLEAR POWER PLANTS AGAINST THE EFFECTS OF POSTULATED PIPE RUPTURE
Description / Abstract:
This test method covers the laboratory determination of
high-temperature high-shear (HTHS) viscosity of engine oils at a
temperature of 150 °C using a multicell capillary viscometer
containing pressure, temperature, and timing instrumentation. The
shear rate for this test method corresponds to an apparent shear
rate at the wall of 1.4 million reciprocal seconds (1.4 × 10 6
s−1).3 This shear rate has been found to
decrease the discrepancy between this test method and other
hightemperature high-shear test methods3 (Test Methods
D4683 and D4741) used for engine oil specifications. Viscosities
are determined directly from calibrations that have been
established with Newtonian oils with nominal viscosities from 1.4
mPa·s to 5.0 mPa·s at 150 °C. The precision has only been
determined for the viscosity range 1.45 mPa·s and 5.05 mPa·s at 150
°C for the materials listed in the precision section.