prEN ISO 14912

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
FOR COMMENT AND APPROVAL. IT IS
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NATIONAL REGULATIONS.
ISO/DIS 14912:2023(E)
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ISO/DIS 14912:2023(E)
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
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 14912:2023(E)
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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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
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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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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