ASTM D2502-14
(Test Method)Standard Test Method for Estimation of Mean Relative Molecular Mass of Petroleum Oils from Viscosity Measurements
Standard Test Method for Estimation of Mean Relative Molecular Mass of Petroleum Oils from Viscosity Measurements
SIGNIFICANCE AND USE
4.1 This test method provides a means of calculating the mean relative molecular mass of petroleum oils from another physical measurement.
4.2 Mean relative molecular mass is a fundamental physical constant that can be used in conjunction with other physical properties to characterize hydrocarbon mixtures.
SCOPE
1.1 This test method covers the estimation of the mean relative molecular mass of petroleum oils from kinematic viscosity measurements at 100 °F and 210 °F (37.78 °C and 98.89 °C).2 It is applicable to samples with mean relative molecular masses in the range from 250 to 700 and is intended for use with average petroleum fractions. It should not be applied indiscriminately to oils that represent extremes of composition or possess an exceptionally narrow mean relative molecular mass range.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 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: D2502 − 14
Standard Test Method for
Estimation of Mean Relative Molecular Mass of Petroleum
1
Oils from Viscosity Measurements
This standard is issued under the fixed designation D2502; 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* 2.2 ASTM Adjuncts:
Mean Relative Molecular Mass of Petroleum Oils from
1.1 This test method covers the estimation of the mean
4
Viscosity Measurements
relative molecular mass of petroleum oils from kinematic
viscosity measurements at 100 °F and 210 °F (37.78 °C and
3. Summary of Test Method
2
98.89 °C). It is applicable to samples with mean relative
3.1 The kinematic viscosity of the oil is determined at
molecular masses in the range from 250 to 700 and is intended
100 °F and 210 °F (37.78 °C and 98.89 °C).Afunction “H”of
for use with average petroleum fractions. It should not be
the 100 °F viscosity is established by reference to a tabulation
applied indiscriminately to oils that represent extremes of
of H function versus 100 °F viscosity. The H value and the
composition or possess an exceptionally narrow mean relative
210 °F viscosity are then used to estimate the mean relative
molecular mass range.
molecular mass from a correlation chart.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
4. Significance and Use
conversions to SI units that are provided for information only
4.1 This test method provides a means of calculating the
and are not considered standard.
mean relative molecular mass of petroleum oils from another
1.3 This standard does not purport to address all of the physical measurement.
safety concerns, if any, associated with its use. It is the
4.2 Mean relative molecular mass is a fundamental physical
responsibility of the user of this standard to establish appro-
constant that can be used in conjunction with other physical
priate safety and health practices and determine the applica-
properties to characterize hydrocarbon mixtures.
bility of regulatory limitations prior to use.
5. Procedure
2. Referenced Documents
5.1 Determine the kinematic viscosity of the oil at 100 °F
3
2.1 ASTM Standards:
and 210 °F (37.78 °C and 98.89 °C) as described in Test
D445 Test Method for Kinematic Viscosity of Transparent
Method D445 or Test Method D7042.
and Opaque Liquids (and Calculation of Dynamic Viscos-
5.2 LookinTable1for100 °F(37.78 °C)viscosityandread
ity)
the value of H that corresponds to the measured viscosity.
D7042 Test Method for Dynamic Viscosity and Density of
Linear interpolation between adjacent columns may be re-
Liquids by Stabinger Viscometer (and the Calculation of
quired.
Kinematic Viscosity)
5.3 Read the viscosity–mean relative molecular mass chart
for H and 210 °F (98.89 °C) viscosity. A simplified version of
thischartisshowninFig.1forillustrationpurposesonly(Note
1
This test method is under the jurisdiction of ASTM Committee D02 on
1). Interpolate where necessary between adjacent lines of
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
210 °F viscosity. After locating the point corresponding to the
Subcommittee D02.04.0K on Correlative Methods.
Current edition approved May 1, 2014. Published June 2014. Originally
value of H (ordinate) and the 210 °F viscosity (superimposed
approved in 1966. Last previous edition approved in 2009 as D2502 – 04 (2009).
lines), read the mean relative molecular mass along the
DOI: 10.1520/D2502-14.
abscissa.
2
Hirschler, A. E., Journal of the Institute of Petroleum, JIPEA, Vol 32, 1946, p.
133.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. Order Adjunct No.
the ASTM website. ADJD2502.
*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 ----------------------
D2502 − 14
TABLE 1 Tabulation ofHFunction
Kinematic
Viscosity,
H
cSt at 100 °F
(37.78 °C)
0 0.2 0.4 0.6 0.8
2 −178 −151 −126 −104 −85
3 −67 −52 −38 −25 −13
4 −1 9 19 28 36
544 52 59 66 73
6 79 85 90 96 101
7 106 111 116 120 124
8 128 132 136 140 144
9 147 151 154 157 160
10 163 166 169 172 175
11 178 180 183 185 188
12 190 192 195 197 199
13 201 203 206 208 210
14 211 213 215 217 219
15 221 222 224 226 227
16 229 231 232 234 235
17 237 238 2
...
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: D2502 − 04 (Reapproved 2009) D2502 − 14
Standard Test Method for
Estimation of Mean Relative Molecular Mass of Petroleum
1
Oils from Viscosity Measurements
This standard is issued under the fixed designation D2502; 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 estimation of the mean relative molecular mass of petroleum oils from kinematic viscosity
2
measurements at 100100 °F and 210°F (37.78210 °F (37.78 °C and 98.89°C).98.89 °C). It is applicable to samples with mean
relative molecular masses in the range from 250 to 700 and is intended for use with average petroleum fractions. It should not be
applied indiscriminately to oils that represent extremes of composition or possess an exceptionally narrow mean relative molecular
mass range.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 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
3
2.1 ASTM Standards:
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D7042 Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic
Viscosity)
2.2 ASTM Adjuncts:
4
Mean Relative Molecular Mass of Petroleum Oils from Viscosity Measurements
3. Summary of Test Method
3.1 The kinematic viscosity of the oil is determined at 100 and 210°F (37.78 and 98.89°C).100 °F and 210 °F (37.78 °C and
98.89 °C). A function “H” of the 100°F100 °F viscosity is established by reference to a tabulation of H function versus
100°F100 °F viscosity. The H value and the 210°F210 °F viscosity are then used to estimate the mean relative molecular mass from
a correlation chart.
4. Significance and Use
4.1 This test method provides a means of calculating the mean relative molecular mass of petroleum oils from another physical
measurement.
4.2 Mean relative molecular mass is a fundamental physical constant that can be used in conjunction with other physical
properties to characterize hydrocarbon mixtures.
5. Procedure
5.1 Determine the kinematic viscosity of the oil at 100100 °F and 210°F (37.78210 °F (37.78 °C and 98.89°C)98.89 °C) as
described in Test Method D445 or Test Method D7042.
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 D02.04.0K on Correlative Methods.
Current edition approved Oct. 1, 2009May 1, 2014. Published November 2009June 2014. Originally approved in 1966. Last previous edition approved in 20042009 as
D2502D2502 – 04 (2009).–04. DOI: 10.1520/D2502-04R09.10.1520/D2502-14.
2
Hirschler, A. E., Journal of the Institute of Petroleum, JIPEA, Vol 32, 1946, p. 133.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Available from ASTM International Headquarters. Order Adjunct No. ADJD2502.
*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 ----------------------
D2502 − 14
5.2 Look in Table 1 for 100°F (37.78°C)100 °F (37.78 °C) viscosity and read the value of H that corresponds to the measured
viscosity. Linear interpolation between adjacent columns may be required.
5.3 Read the viscosity–mean relative molecular mass chart for H and 210°F (98.89°C)210 °F (98.89 °C) viscosity. A simplified
version of this chart is shown in Fig. 1 for illustration purposes only (Note 1). Interpolate where necessary between adjacent lines
of 210°F210 °F viscosity. After locating the point corresponding to the value of H (ordinate) and the 210°
...
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