prEN ISO 14912
(Main)Gas analysis - Conversion of gas mixture composition data (ISO/DIS 14912:2023)
Gas analysis - Conversion of gas mixture composition data (ISO/DIS 14912:2023)
ISO 14912:2003 defines the following quantities commonly used to express the composition of gas mixtures: mole fraction, mass fraction and volume fraction, as well as mole concentration, mass concentration and volume concentration.
Relating to these quantities of composition, ISO 14912:2003 provides methods for the conversion between different quantities and the conversion between different state conditions. Conversion between different quantities means calculating the numerical value of an analyte content in terms of one of the quantities listed above from the numerical value of the same analyte content, at the same pressure and temperature of the gas mixture, given in terms of another of these quantities. Conversion between different state conditions means calculating the numerical value of an analyte content, in terms of one of the quantities listed above, under one set of state conditions from the numerical value of the same quantity under another set of state conditions, i.e. pressure and temperature, of the gas mixture. Gas mixture composition can be converted simultaneously between different quantities of composition and different state conditions by combination of the two types of conversion.
ISO 14912:2003 is only applicable to homogeneous and stable gas mixtures. Therefore any state conditions (pressure and temperature) considered need to be well outside from the condensation region of the gas mixture and that of each of the specified analytes.
Gasanalyse - Umrechnung von Zusammensetzungsangaben für Gasgemische (ISO/DIS 14912:2023)
Analyse des gaz - Conversion des données de composition de mélanges gazeux (ISO/DIS 14912:2023)
Analiza plinov - Pretvorba podatkov o sestavi plinskih zmesi (ISO/DIS 14912:2023)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2023
Analiza plinov - Pretvorba podatkov o sestavi plinskih zmesi (ISO/DIS 14912:2023)
Gas analysis - Conversion of gas mixture composition data (ISO/DIS 14912:2023)
Gasanalyse - Umrechnung von Zusammensetzungsangaben für Gasgemische (ISO/DIS
14912:2023)
Analyse des gaz - Conversion des données de composition de mélanges gazeux
(ISO/DIS 14912:2023)
Ta slovenski standard je istoveten z: prEN ISO 14912
ICS:
71.040.40 Kemijska analiza Chemical analysis
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT INTERNATIONAL STANDARD
ISO/DIS 14912
ISO/TC 158 Secretariat: SAC
Voting begins on: Voting terminates on:
2023-07-31 2023-10-23
Gas analysis — Conversion of gas mixture composition data
Analyse des gaz — Conversion des données de composition de mélanges gazeux
ICS: 71.040.40
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
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ISO/DIS 14912:2023(E)
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PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
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DRAFT INTERNATIONAL STANDARD
ISO/DIS 14912
ISO/TC 158 Secretariat: SAC
Voting begins on: Voting terminates on:
Gas analysis — Conversion of gas mixture composition data
Analyse des gaz — Conversion des données de composition de mélanges gazeux
ICS: 71.040.40
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 14912:2023(E)
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
ISO/DIS 14912:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Quantities for the expression of gas mixture composition . 2
3.2 Additional quantities involved in conversions of gas mixture composition . 3
4 Symbols and units. 4
5 Basic Principles . 5
5.1 Expression of gas mixture composition. 5
5.2 Conversion between different quantities . 7
5.3 Conversion between different state conditions . 9
6 Main procedures . 9
6.1 Conversion between different quantities of composition . 9
6.1.1 Conversion of the content of single components . 9
6.1.2 Conversion of complete compositions . 10
6.2 Conversion to reference conditions . 11
7 Practical implementation.12
7.1 Conversion between quantities of composition .12
7.2 Conversion of single contents . .13
7.3 Conversion of complete compositions . 13
7.4 Conversion between state conditions . 14
7.5 Simple approximations applicable to conversion . 14
7.5.1 Ideal mixture of ideal gases . 14
7.5.2 Ideal mixture of real gases . 14
7.5.3 Trace gas mixture . 15
8 Input quantities and their uncertainties .15
8.1 Pure gas data .15
8.1.1 Molar mass .15
8.1.2 Compression factor . 16
8.2 Gas mixture data . 17
8.2.1 Molar mass . 17
8.2.2 Compression factor . 18
8.2.3 Mixing factor .20
8.3 Rough uncertainty estimates . 21
9 Conversion uncertainty .21
9.1 General considerations. 21
9.2 Conversion of single contents . . 21
9.3 Conversion of complete compositions . 23
9.4 Uncertainty calculation using numerical differentiation. 25
9.5 Variances and covariances of input composition data . 26
9.5.1 General procedure .26
9.5.2 Correlation effects in complete composition data . 26
Annex A (informative) Assessment of state conditions .28
Annex B (informative) Summation relations for the expression of mixture properties .31
Annex C (informative) Mixture component data.32
Annex D (informative) Examples .38
Annex E (informative) Computer implementation of recommended methods.53
iii
ISO/DIS 14912:2023(E)
Bibliography .54
iv
ISO/DIS 14912:2023(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 158 Analysis of gases.
This second edition cancels and replaces the first edition (ISO 14912:2003 and Cor.1:2006), which has
been technical
...
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