ASTM D3829-02

Standard Test Method for Predicting the Borderline Pumping Temperature of Engine Oil

SIGNIFICANCE AND USE
Borderline pumping temperature is a measure of the lowest temperature at which an engine oil can be continuously and adequately supplied to the oil pump inlet of an automotive engine.
SCOPE
1.1 This test method covers the prediction of the borderline pumping temperature (BPT) of engine oils through the use of a 16-h cooling cycle over the temperature range from 0 to -40°C.
1.2 Applicability to petroleum products other than engine oils has not been determined.
1.3 This test method uses the millipascal (mPa·s), as the unit of viscosity. For information, the equivalent centipoise unit is shown in parentheses.
1.4 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.

General Information

• Status: Historical
• Publication Date: 09-Nov-2002
• ICS: 75.100 - Lubricants, industrial oils and related products
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.07 - Flow Properties

Relations

• Replaces: ASTM D3829-93(1998) - Standard Test Method for Predicting the Borderline Pumping Temperature of Engine Oil
• Effective Date: 10-Nov-2002
• Replaced By: ASTM D3829-02(2007) - Standard Test Method for Predicting the Borderline Pumping Temperature of Engine Oil
• Effective Date: 01-Nov-2007
• Referred By: ASTM D8164-21 - Standard Guide for Digital Contact Thermometers for Petroleum Products, Liquid Fuels, and Lubricant Testing
• Effective Date: 10-Nov-2002
• Referred By: ASTM D8278-20 - Standard Specification for Digital Contact Thermometers for Test Methods Measuring Flow Properties of Fuels and Lubricants
• Effective Date: 10-Nov-2002
• Referred By: ASTM D5133-20a - Standard Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique
• Effective Date: 10-Nov-2002
• Referred By: ASTM D4684-20a - Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature
• Effective Date: 10-Nov-2002
• Referred By: ASTM D6821-20a - Standard Test Method for Low Temperature Viscosity of Drive Line Lubricants in a Constant Shear Stress Viscometer
• Effective Date: 10-Nov-2002
• Referred By: ASTM D6896-20a - Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Used Engine Oils at Low Temperature
• Effective Date: 10-Nov-2002
• Referred By: ASTM D7110-21 - Standard Test Method for Determining the Viscosity-Temperature Relationship of Used and Soot-Containing Engine Oils at Low Temperatures
• Effective Date: 10-Nov-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation: D 3829 – 02
Standard Test Method for
Predicting the Borderline Pumping Temperature of Engine
1
Oil
This standard is issued under the fixed designation D3829; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
where:
G = shear rate at the surface of the rotor in reciprocal
1.1 This test method covers the prediction of the borderline
r
−1
seconds, s ,
pumping temperature (BPT) of engine oils through the use of
V = angular velocity, rad/s,
a 16-h cooling cycle over the temperature range from 0
R = stator radius, mm,
s
to−40°C.
R = rotor radius, mm, and
r
1.2 Applicability to petroleum products other than engine
t = time in seconds for one revolution of the rotor.
oils has not been determined.
For the specific apparatus being described in 5.1.1,
1.3 Thistestmethodusesthemillipascal(mPa·s),astheunit
63
of viscosity. For information, the equivalent centipoise unit is
G 5 (3)
r
t
shown in parentheses.
1.4 This standard does not purport to address all of the
2.1.5 shear stress—the motivating force per unit area for
safety concerns, if any, associated with its use. It is the
fluid flow. Area is the area under shear. For the rotary
responsibility of the user of this standard to establish appro-
viscometer being described, the rotor surface is the area under
priate safety and health practices and determine the applica-
shear.
bility of regulatory limitations prior to use.
26
T 59.81M~R 1 R ! 310 (4)
r o t
2. Terminology
T
r
9
S 5 310 (5)
r
2
2p R h
2.1 Definitions: r
2.1.1 apparent viscosity—the determined viscosity obtained
where:
by use of this test method.
T = torque applied to rotor, N·m,
r
2.1.2 Newtonian oil or fluid—an oil or fluid that at a given
M = applied mass, g,
temperature exhibits a constant viscosity at all shear rates or
R = radius of the shaft, mm,
o
shear stresses.
R = radius of the thread, mm,
t
2.1.3 non-Newtonian oil or fluid—an oil or fluid that at a
S = shear stress at the rotor surface, Pa, and
r
given temperature exhibits a viscosity that varies with chang-
h = height of the rotor, mm.
ing shear stress or shear rate.
For the dimensions given in 5.1.1,
2.1.4 shear rate—the velocity gradient in fluid flow. For a
26
T 531.7M 310 (6)
r
Newtonian fluid in a concentric cylinder rotary viscometer in
S 53.5M (7)
which the shear stress is measured at the inner cylinder surface r
(such as the apparatus being described), and ignoring any end
2.1.6 viscosity—the ratio between the applied shear stress
effects, the shear rate is given as follows:
and rate of shear. It is sometimes called the coefficient of
2
dynamic viscosity. This value is thus a measure of the
2VR
s
G 5 (1)
resistance to flow of the liquid. The SI unit of viscosity is the
r 2 2
~R – R !
s r
pascal second (Pa·s). The centipoise (cP) is one millipascal
2
4pR
s second (mPa·s) and is often used.
G 5 (2)
r
2 2
t R – R !
~
s r 2.2 Definitions of Terms Specific to This Standard:
2.2.1 borderline pumping temperature—the maximum tem-
perature at which the critical yield stress or critical viscosity
1
This test method is under the jurisdiction of ASTM Committee D02 on
occurs, whichever is the higher temperature.
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
2.2.2 calibration oils—those oils for establishing the instru-
D02.07 on Flow Properties.
ment’sreferenceframeworkofapparentviscosityversusspeed
Current edition approved Nov. 10, 2002. Published January 2003. Originally
approved in 1979. Last previous edition approved in 1998 as D3829–93(1998). from which the apparent viscosities of test oils are determined.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3829–02
2
Calibration oils, which are essentially Newtonian fluids, are 5.2 Thermometers, for measuring temperature of the
available commercially, and have an approximate viscosity of block. Two are required, one graduated from at least+70 to
2
30000 mPa·s (30000 cP) at−20°C. 90°C in 1°C subdivisions, the other with a scale from at
2.2.3 critical viscosity—themaximumviscosityatadefined least−36 to +5°C in 0.2°C subdivisions.
shear rate to allow adequate flow of oil to the oil pump in an 5.3 A means of lowering the temperature to the predeter-
automotive engine. A higher viscosity can cause failure to mined test temperature at a controlled, nonlinear rate.
2
maintain adequate oil pressure through the limiting of flow 5.4 Circulating System, forsupplyingsuitableliquidcool-
through the oil screen
...