ASTM D2421-19
(Practice)Standard Practice for Interconversion of Analysis of C5 and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis
Standard Practice for Interconversion of Analysis of C<emph type="ital"><inf>5</inf ></emph> and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis
SIGNIFICANCE AND USE
3.1 For custody transfer and other purposes, it is frequently necessary to convert a component analysis of light hydrocarbon mixture from one basis (either gas volume, liquid volume, or mass) to another.
3.2 The component distribution data of light hydrocarbon mixtures can be used to calculate physical properties such as relative density, vapor-pressure, and calorific value. Consistent and accurate conversion data are extremely important when calculating vapor, liquid, or mass equivalence.
SCOPE
1.1 This practice describes the procedure for the interconversion of the analysis of C5 and lighter hydrocarbon mixtures to gas-volume (mole), liquid-volume, or mass basis.
1.2 The computation procedures described assume that gas-volume percentages have already been corrected for nonideality of the components as a part of the analytical process by which they have been obtained. These are numerically the same as mole percentages.
1.3 The procedure assumes the absence of nonadditivity corrections for mixtures of the pure liquid compounds. This is approximately true only for mixtures of hydrocarbons of the same number of carbon atoms, and in the absence of diolefins and acetylenic compounds.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: D2421 − 19
Standard Practice for
Interconversion of Analysis of C and Lighter Hydrocarbons
5
1
to Gas-Volume, Liquid-Volume, or Mass Basis
This standard is issued under the fixed designation D2421; 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* for methane, ethylene, and acetylene are not those of pure
materials but are assumed to apply as a component of a liquid
1.1 This practice describes the procedure for the intercon-
mixture.
version of the analysis of C and lighter hydrocarbon mixtures
5
to gas-volume (mole), liquid-volume, or mass basis. 2.2 The conversion factors for 1 mL of ideal gas at 15.6 °C
(60 °F) and 101.325 kPa (760 mm Hg) to millilitres of liquid at
1.2 The computation procedures described assume that
15.6 °C (60 °F) have been calculated as follows: For 1 mL gas
gas-volume percentages have already been corrected for non-
at 15.6 °C (60 °F), 101.325 kPa (760 mm Hg),
idealityofthecomponentsasapartoftheanalyticalprocessby
which they have been obtained. These are numerically the
same as mole percentages. L 5 ~273.15 K/288.71! 3 ~M/22414! (1)
1.3 The procedure assumes the absence of nonadditivity
3 1/ relative density 3 0.999016
@ @~ ! ~ !##
corrections for mixtures of the pure liquid compounds. This is
25
approximately true only for mixtures of hydrocarbons of the
54.2252 310 3 M/relative density
~ !
same number of carbon atoms, and in the absence of diolefins
5millilitres liquid at 15.6 °C ~60 °F!
and acetylenic compounds.
where:
1.4 The values stated in SI units are to be regarded as
standard. The values given in parentheses after SI units are
L = calculated liquid volume, mL,
provided for information only and are not considered standard. M = molecular weight, g-mol,
22414 = calculated from V=nRT/P,
1.5 This standard does not purport to address all of the
n = 1 g-mol,
safety concerns, if any, associated with its use. It is the
–1 –1
R = 8314.472 mL kPa K g-mol ,
responsibility of the user of this standard to establish appro-
T = 273.15 K, and
priate safety, health, and environmental practices and deter-
P = 101.325 kPa.
mine the applicability of regulatory limitations prior to use.
2.3 Where ideal gas volumes have been measured at tem-
1.6 This international standard was developed in accor-
peratures and pressures different from 15.6 °C (60 °F) at
dance with internationally recognized principles on standard-
101.325 kPa (760 mm Hg), they shall be corrected to these
ization established in the Decision on Principles for the
conditions.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3. Significance and Use
Barriers to Trade (TBT) Committee.
3.1 For custody transfer and other purposes, it is frequently
necessary to convert a component analysis of light hydrocar-
2. Source of Data
bon mixture from one basis (either gas volume, liquid volume,
2.1 Thebasicvaluesfortherelativedensity15.6 °C⁄15.6 °C
or mass) to another.
(60 °F⁄60 °F) of the pure compounds have been obtained from
TRC (formerly the Thermodynamics Research Center, and 3.2 The component distribution data of light hydrocarbon
mixtures can be used to calculate physical properties such as
now part of NIST), except where otherwise noted. The values
relative density, vapor-pressure, and calorific value. Consistent
and accurate conversion data are extremely important when
1
calculating vapor, liquid, or mass equivalence.
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
mittee D02.H0 on Liquefied Petroleum Gas. 4. Procedure
Current edition approved Nov. 1, 2019. Published January 2020. Originally
4.1 To convert from the original to the desired basis,
approved in 1965. Last previous edition approved in 2018 as D2421 – 18. DOI:
10.1520/D2421-19. multiplyordividethepercentofeachcompoundintheoriginal
*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 ----------------------
D2421 − 19
basis according to the schedule shown in Table 1. Perform the 4.2 Add the products or quotients obtained in accordance
calculation, using the corresponding factor indicated in Table with 4.1.
2. Carry at least one more significant figure in all of the
4.3 Multiply the products or quotients obtained in accor-
calculations than the number of significant figures in the
dance with 4.1 by 100 divided by the s
...
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: D2421 − 18 D2421 − 19
Standard Practice for
Interconversion of Analysis of C and Lighter Hydrocarbons
5
1
to Gas-Volume, Liquid-Volume, or Mass Basis
This standard is issued under the fixed designation D2421; 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 practice describes the procedure for the interconversion of the analysis of C and lighter hydrocarbon mixtures to
5
gas-volume (mole), liquid-volume, or mass basis.
1.2 The computation procedures described assume that gas-volume percentages have already been corrected for nonideality of
the components as a part of the analytical process by which they have been obtained. These are numerically the same as mole
percentages.
1.3 The procedure assumes the absence of nonadditivity corrections for mixtures of the pure liquid compounds. This is
approximately true only for mixtures of hydrocarbons of the same number of carbon atoms, and in the absence of diolefins and
acetylenic compounds.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for
information only and are not considered standard.
1.5 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Source of Data
2.1 The basic values for the relative density 15.6 °C ⁄15.6 °C (60 °F ⁄60 °F) of the pure compounds have been obtained from
TRC (formerly the Thermodynamics Research Center, and now part of NIST), except where otherwise noted. The values for
methane, ethylene, and acetylene are not those of pure materials but are assumed to apply as a component of a liquid mixture.
2.2 The conversion factors for 1 mL of ideal gas at 15.6 °C (60 °F) and 101.325 kPa (760 mm Hg) to millilitres of liquid at
15.6 °C (60 °F) have been calculated as follows: For 1 mL gas at 15.6 °C (60 °F), 101.325 kPa (760 mm Hg),
L 5 273.15 K/288.71 3 M/22414 (1)
~ ! ~ !
3 1/ relative density 3 0.999016
@ @~ ! ~ !##
25
4.2252 310 3~M/relative density!
5millilitres liquid at 15.6 °C ~60 °F!
L 5 273.15 K/288.71 3 M/22414 (1)
~ ! ~ !
3 1/ relative density 3 0.999016
@ @~ ! ~ !##
25
54.2252 310 3~M/relative density!
5millilitres liquid at 15.6 °C ~60 °F!
1
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.H0 on Liquefied Petroleum Gas.
Current edition approved June 1, 2018Nov. 1, 2019. Published November 2018January 2020. Originally approved in 1965. Last previous edition approved in 20132018
as D2421 – 13.D2421 – 18. DOI: 10.1520/D2421-18.10.1520/D2421-19.
*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 ----------------------
D2421 − 19
where:
L = calculated liquid volume, mL,
M = molecular weight, g-mol,
22414 = calculated from V=nRT/P,
n = 1 g-mol,
–1 –1
R = 8314.472 mL kPa K g-mol ,
T = 273.15 K, and
P = 101.325 kPa.
2.3 Where ideal gas volumes have been measured at temperatures and pressures different from 15.6 °C (60 °F) at 101.325 kPa
(760 mm Hg), they shall be corrected to these conditions.
3. Significance and Use
3.1 For custody transfer and other purposes, it is frequently necessary to convert a component analysis of light hydrocarbon
mixture from one basis (either gas volume, liquid volume, or mass) to another.
3.2 The component distribution data of light hydrocarbon mixtures can be used to calculate physical properties such as relative
density, vapor-pressure, and calorific value. Consistent and accurate conversion data are extremely important when calculating
vapor, liquid, or mass equivalence.
4. Procedure
4
...
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