ASTM D3829-14
(Test Method)Standard Test Method for Predicting the Borderline Pumping Temperature of Engine Oil
Standard Test Method for Predicting the Borderline Pumping Temperature of Engine Oil
SIGNIFICANCE AND USE
5.1 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 °C to −40 °C. The precision is stated for temperatures from –34 °C to –15 °C.
1.2 Applicability to petroleum products other than engine oils has not been determined.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exception—This test method uses the SI based unit of milliPascal second (mPa·s) for viscosity, which is equivalent to centipoise (cP).
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.
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Designation: D3829 − 14
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* ISO Guide 34General Requirements for the Competence of
Reference Material Producers
1.1 This test method covers the prediction of the borderline
pumping temperature (BPT) of engine oils through the use of
3. Terminology
a 16h cooling cycle over the temperature range from 0°C to
3.1 Definitions:
−40°C.Theprecisionisstatedfortemperaturesfrom–34°Cto
3.1.1 apparent viscosity, n—the determined viscosity ob-
–15°C.
tained by use of this test method.
1.2 Applicability to petroleum products other than engine
3.1.2 Digital Contact Thermometer (DCT), n—anelectronic
oils has not been determined.
device consisting of a digital display and associated tempera-
1.3 The values stated in SI units are to be regarded as
ture sensing probe.
standard. No other units of measurement are included in this
3.1.2.1 Discussion—This device consists of a temperature
standard.
sensor connected to a measuring instrument; this instrument
1.3.1 Exception—This test method uses the SI based unit of
measures the temperature-dependent quantity of the sensor,
milliPascalsecond(mPa·s)forviscosity,whichisequivalentto
computes the temperature from the measured quantity, and
centipoise (cP).
providesadigitaloutput,ordisplayofthetemperature,orboth.
1.4 This standard does not purport to address all of the
This device is sometimes referred to as a digital thermometer.
safety concerns, if any, associated with its use. It is the
NOTE 1—Portable electronic thermometers (PET) is an acronym some-
responsibility of the user of this standard to establish appro-
times used to refer to a subset of the devices covered by this definition.
priate safety and health practices and determine the applica-
3.1.3 Newtonian oil or fluid, n—anoilorfluidthatatagiven
bility of regulatory limitations prior to use.
temperature exhibits a constant viscosity at all shear rates or
shear stresses.
2. Referenced Documents
3.1.4 non-Newtonian oil or fluid, n—an oil or fluid that at a
2.1 ASTM Standards:
given temperature exhibits a viscosity that varies with chang-
E563Practice for Preparation and Use of an Ice-Point Bath
ing shear stress or shear rate.
as a Reference Temperature
E644Test Methods for Testing Industrial Resistance Ther-
3.1.5 shear rate, n—the velocity gradient in fluid flow. For
mometers
a Newtonian fluid in a concentric cylinder rotary viscometer in
E1137SpecificationforIndustrialPlatinumResistanceTher-
whichtheshearstressismeasuredattheinnercylindersurface
mometers
(such as the apparatus being described), and ignoring any end
E2877Guide for Digital Contact Thermometers
effects, the shear rate is given as follows:
2
2.2 ISO Standards:
2
2ΩR
s
ISO 17025General Requirements for the Competence of γ˙ 5 (1)
2 2
R 2 R
~ !
s r
Testing and Calibration Laboratories
2
4πR
s
γ˙ 5 (2)
2 2
t R 2 R
~ !
s r
where:
1
This test method is under the jurisdiction of ASTM Committee D02 on
γ˙ = shear rate at the surface of the rotor in reciprocal
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
−1
seconds, s ,
Subcommittee D02.07 on Flow Properties.
Ω = angular velocity, rad/s,
Current edition approved July 1, 2014. Published August 2014. Originally
approved in 1979. Last previous edition approved in 2012 as D3829–12. DOI:
R = stator radius, mm,
s
10.1520/D3829-14.
R = rotor radius, mm, and
r
2
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
t = time in seconds for one revolution of the rotor.
4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D3829 − 14
1
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D3829 − 14
For the specific apparatus being described in 6.1.1, 10 h period and held at the test temperature for the remainder
of a 16h period. After completion of the soak period, two
63
γ˙ 5 (3)
standard torques of increasing severity are applied to the rotor
t
shaft and the speed of rotation in each case is measured. From
3.1.6 shear stress, n—the motivating force per unit area for
the results at three or more temperatures, the borderline
fluid flow. Area is the area under shear. For the rotary
pumping temperature is determined.
viscometer being described,
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3829 − 12 D3829 − 14
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers the prediction of the borderline pumping temperature (BPT) of engine oils through the use of a
16-h16 h cooling cycle over the temperature range from 00 °C to −40°C.−40 °C. The precision is stated for temperatures from
-34–34 °C to -15°C.–15 °C.
1.2 Applicability to petroleum products other than engine oils has not been determined.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exception—This test method uses the SI based unit of milliPascal second (mPa·s) for viscosity, which is equivalent to
centipoise (cP).
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.
2. Referenced Documents
2.1 ASTM Standards:
E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
E644 Test Methods for Testing Industrial Resistance Thermometers
E1137 Specification for Industrial Platinum Resistance Thermometers
E2877 Guide for Digital Contact Thermometers
2
2.2 ISO Standards:
ISO 17025 General Requirements for the Competence of Testing and Calibration Laboratories
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.07 on Flow Properties.
Current edition approved Nov. 1, 2012July 1, 2014. Published April 2013August 2014. Originally approved in 1979. Last previous edition approved in 20072012 as
D3829–02(2007).D3829 – 12. DOI: 10.1520/D3829-12.10.1520/D3829-14.
2
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D3829 − 14
ISO Guide 34 General Requirements for the Competence of Reference Material Producers
3. Terminology
3.1 Definitions:
3.1.1 apparent viscosity, n—the determined viscosity obtained by use of this test method.
3.1.2 Digital Contact Thermometer (DCT), n—an electronic device consisting of a digital display and associated temperature
sensing probe.
3.1.2.1 Discussion—
This device consists of a temperature sensor connected to a measuring instrument; this instrument measures the temperature-
dependent quantity of the sensor, computes the temperature from the measured quantity, and provides a digital output, or display
of the temperature, or both. This device is sometimes referred to as a digital thermometer.
NOTE 1—Portable electronic thermometers (PET) is an acronym sometimes used to refer to a subset of the devices covered by this definition.
3.1.3 Newtonian oil or fluid, n—an oil or fluid that at a given temperature exhibits a constant viscosity at all shear rates or shear
stresses.
3.1.4 non-Newtonian oil or fluid, n—an oil or fluid that at a given temperature exhibits a viscosity that varies with changing
shear stress or shear rate.
3.1.5 shear rate, n—the velocity gradient in fluid flow. For a Newtonian fluid in a concentric cylinder rotary viscometer in which
the shear stress is measured at the inner cylinder surface (such as the apparatus being described), and ignoring any end effects, the
shear rate is given as follows:
2
2ΩR
s
G 5 (1)
2 2
r
R 2 R
~ !
s r
2
2ΩR
s
γ˙ 5 (1)
2 2
~R 2 R !
s r
2
4πR
s
G 5 (2)
r 2 2
t R 2 R
~ !
s r
2
4πR
s
γ˙ 5 (2)
2 2
t R 2 R
~ !
s r
where:
where:
−1
G = shear rate at the surface of the rotor in reciprocal seconds, s ,
r
−1
γ˙ = shear rate at the surface of the rotor in reciprocal seconds, s ,
Ω = angular velocity, rad/s,
R = stator radius, mm,
s
R = rotor radius, mm, and
r
t = time in seconds for one revolution of the rotor.
For the specific apparatus being descri
...
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