ASTM D3829-12
(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 to −40°C. The precision is stated for temperatures from -34 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 − 12
StandardTest 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* computes the temperature from the measured quantity, and
providesadigitaloutput,ordisplayofthetemperature,orboth.
1.1 This test method covers the prediction of the borderline
This device is sometimes referred to as a digital thermometer.
pumping temperature (BPT) of engine oils through the use of
a 16-h cooling cycle over the temperature range from 0 to
3.1.3 Newtonian oil or fluid, n—anoilorfluidthatatagiven
−40°C. The precision is stated for temperatures from -34 to
temperature exhibits a constant viscosity at all shear rates or
-15°C.
shear stresses.
1.2 Applicability to petroleum products other than engine
3.1.4 non-Newtonian oil or fluid, n—an oil or fluid that at a
oils has not been determined.
given temperature exhibits a viscosity that varies with chang-
ing shear stress or shear rate.
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3.1.5 shear rate, n—the velocity gradient in fluid flow. For
standard.
aNewtonianfluidinaconcentriccylinderrotaryviscometerin
1.3.1 Exception—This test method uses the SI based unit of
whichtheshearstressismeasuredattheinnercylindersurface
milliPascalsecond(mPa·s)forviscosity,whichisequivalentto
(such as the apparatus being described), and ignoring any end
centipoise (cP).
effects, the shear rate is given as follows:
1.4 This standard does not purport to address all of the 2
2ΩR
s
G 5 (1)
safety concerns, if any, associated with its use. It is the 2 2
r
R 2 R
~ !
s r
responsibility of the user of this standard to establish appro-
2
4πR
s
priate safety and health practices and determine the applica-
G 5 (2)
r 2 2
t~R 2 R !
s r
bility of regulatory limitations prior to use.
where:
2. Referenced Documents
G = shear rate at the surface of the rotor in reciprocal
r
−1
2.1 ASTM Standards:
seconds, s ,
E1137SpecificationforIndustrialPlatinumResistanceTher-
Ω = angular velocity, rad/s,
mometers
R = stator radius, mm,
s
R = rotor radius, mm, and
r
3. Terminology
t = time in seconds for one revolution of the rotor.
3.1 Definitions:
For the specific apparatus being described in 6.1.1,
3.1.1 apparent viscosity, n—the determined viscosity ob-
63
tained by use of this test method.
G 5 (3)
r
t
3.1.2 Digital Contact Thermometer (DCT), n—anelectronic
3.1.6 shear stress, n—the motivating force per unit area for
device consisting of a digital display and associated tempera-
fluid flow. Area is the area under shear. For the rotary
ture sensing probe.
viscometer being described, the rotor surface is the area under
3.1.2.1 Discussion—This device consists of a temperature
shear.
sensor connected to a measuring instrument; this instrument
26
measures the temperature-dependent quantity of the sensor, T 5 9.81M~R 1R ! 310 (4)
r o t
T
r
9
S 5 310 (5)
r 2
1
2π R h
This test method is under the jurisdiction of ASTM Committee D02 on
r
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
where:
D02.07 on Flow Properties.
Current edition approved Nov. 1, 2012. Published April 2013. Originally
T = torque applied to rotor, N·m,
r
approved in 1979. Last previous edition approved in 2007 as D3829–02(2007).
M = applied mass, g,
DOI: 10.1520/D3829-12.
*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 − 12
4.2 Alternatively, for some specification or classification
R = radius of the shaft, mm,
o
purposes it may be sufficient to determine that the BPT is less
R = radius of the thread, mm,
t
than a certain specified temperature.
S = shear stress at the rotor surface, Pa, and
r
h = height of the rotor, mm.
5. Significance and Use
For the dimensions given in 6.1.1,
5.1 Borderline pumping temperature is a measure of the
26
T 5 31.7M 310 (6)
r
lowest temperature at which an engine oil can be continuously
S 5 3.5M (7)
r and adequately supplied to the oil pump inlet of an automotive
3.1.7 viscosity, n—the ratio between the applied shear stress engine.
and rate of shear. It is sometimes called the coefficient of
6. Apparatus
dynamic viscosity. This value is thus a measure of the
2
resistance to flow of the liquid. The SI unit of viscosity is the 6.1 Mini-Rotary Viscometer, consisting of one or more vis-
pascal seco
...
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 − 02 (Reapproved 2007) D3829 − 12
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 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. The precision is stated for temperatures from -34 to -15°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.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:
E1137 Specification for Industrial Platinum Resistance Thermometers
3. Terminology
3.1 Definitions:
3.1.1 apparent viscosity—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.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.07 on
Flow Properties.
Current edition approved Nov. 1, 2007Nov. 1, 2012. Published January 2008April 2013. Originally approved in 1979. Last previous edition approved in 20022007 as
D3829D3829–02(2007).–02. DOI: 10.1520/D3829-02R07.10.1520/D3829-12.
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.
3.1.3 Newtonian oil or fluid—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—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—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:
*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 − 12
2
2ΩR
s
G 5 (1)
r 2 2
~R 2 R !
s r
2
4πR
s
G 5 (2)
r 2 2
t R 2 R
~ !
s r
where:
−1
G = shear rate at the surface of the rotor in reciprocal seconds, s ,
r
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 described in 5.1.16.1.1,
63
G 5 (3)
r
t
3.1.6 shear stress—stress, n—the motivating force per unit area for fluid flow. Area is the area under shear. For the rotary
viscometer being described, the rotor surface is the area under shear.
26
T 5 9.81M~R 1R ! 310 (4)
r o t
T
r
9
S 5 310 (5)
r 2
2π R h
r
where:
T = torque applied to rotor, N·m,
r
M = applied mass, g,
R = radius of the shaft, mm,
o
R = radius of the thread, mm,
t
S = shear stress at the rotor surface, Pa, and
r
h = height of the rotor, mm.
For the dimensions given in 5.1.16.1.1,
26
T 5 31.7M 310 (6)
r
S 5 3.5M (7)
r
3.1.7 viscosity—viscosity, n—the ratio between the applied shear stress and rate of shear. It
...
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