EN ISO 12213-3:2009

SLOVENSKI STANDARD
01-november-2009
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SIST EN ISO 12213-3:2005
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Natural gas - Calculation of compression factor - Part 3: Calculation using physical
properties (ISO 12213-3:2006)
Erdgas - Berechnung von Realgasfaktoren - Teil 3: Berechnungen basierend auf
physikalischen Stoffeigenschaften als Eingangsgrößen (ISO 12213-3:2006)
Gaz naturel - Calcul du facteur de compression - Partie 3: Calcul à partir des
caractéristiques physiques (ISO 12213-3:2006)
Ta slovenski standard je istoveten z: EN ISO 12213-3:2009
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12213-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2009
ICS 75.060 Supersedes EN ISO 12213-3:2005
English Version
Natural gas - Calculation of compression factor - Part 3:
Calculation using physical properties (ISO 12213-3:2006)
Gaz naturel - Calcul du facteur de compression - Partie 3: Erdgas - Berechnung von Realgasfaktoren - Teil 3:
Calcul à partir des caractéristiques physiques (ISO 12213- Berechnungen basierend auf physikalischen
3:2006) Stoffeigenschaften als Eingangsgrößen (ISO 12213-
3:2006)
This European Standard was approved by CEN on 13 August 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12213-3:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 12213-3:2006 has been prepared by Technical Committee ISO/TC 193 “Natural gas” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 12213-3:2009.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2010, and conflicting national standards shall be withdrawn at
the latest by March 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 12213-3:2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 12213-3:2006 has been approved by CEN as a EN ISO 12213-3:2009 without any
modification.
INTERNATIONAL ISO
STANDARD 12213-3
Second edition
2006-11-15
Natural gas — Calculation of
compression factor —
Part 3:
Calculation using physical properties
Gaz naturel — Calcul du facteur de compression —
Partie 3: Calcul à partir des caractéristiques physiques

Reference number
ISO 12213-3:2006(E)
©
ISO 2006
ISO 12213-3:2006(E)
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ii © ISO 2006 – All rights reserved

ISO 12213-3:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Method of calculation. 2
4.1 Principle. 2
4.2 The SGERG-88 equation . 2
4.3 Input variables. 3
4.4 Ranges of application. 3
4.5 Uncertainty . 5
5 Computer program . 6
Annex A (normative) Symbols and units. 7
Annex B (normative) Description of the SGERG-88 method. 10
Annex C (normative) Example calculations . 21
Annex D (normative) Conversion factors . 22
Annex E (informative) Specification for pipeline quality natural gas . 25
Annex F (informative) Performance over wider ranges of application . 28
Annex G (informative) Subroutine SGERG.FOR in Fortran . 33
Bibliography . 38

ISO 12213-3:2006(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 through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 12213-3 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis
of natural gas.
This second edition cancels and replaces the first edition (ISO 12213-3:1997), which has been technically
revised. The revision includes changes to Subclause 4.4.1 and the addition of a new annex, Annex E.
ISO 12213 consists of the following parts, under the general title Natural gas — Calculation of compression
factor:
⎯ Part 1: Introduction and guidelines
⎯ Part 2: Calculation using molar-composition analysis
⎯ Part 3: Calculation using physical properties

iv © ISO 2006 – All rights reserved

INTERNATIONAL STANDARD ISO 12213-3:2006(E)

Natural gas — Calculation of compression factor —
Part 3:
Calculation using physical properties
1 Scope
ISO 12213 specifies methods for the calculation of compression factors of natural gases, natural gases
containing a synthetic admixture and similar mixtures at conditions under which the mixture can exist only as a
gas.
This part of ISO 12213 specifies a method for the calculation of compression factors when the superior
calorific value, relative density and carbon dioxide content are known, together with the relevant pressures
and temperatures. If hydrogen is present, as is often the case for gases with a synthetic admixture, the
hydrogen content also needs to be known.
NOTE In principle, it is possible to calculate the compression factor when any three of the parameters superior
calorific value, relative density, carbon dioxide content (the usual three) and nitrogen content are known, but subsets
including nitrogen content are not recommended.
The method is primarily applicable to pipeline quality gases within the ranges of pressure p and temperature T
at which transmission and distribution operations normally take place, with an uncertainty of about ± 0,1 %.
For wider-ranging applications the uncertainty of the results increases (see Annex F).
More detail concerning the scope and field of application of the method is given in ISO 12213-1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6976:1995, Natural gas — Calculation of calorific values, density, relative density and Wobbe index from
composition
ISO 12213-1, Natural gas — Calculation of compression factor — Part 1: Introduction and guidelines
ISO 80000-4, Quantities and units — Part 4: Mechanics
ISO 80000-5, Quantities and units — Part 5: Thermodynamics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12213-1 apply.
ISO 12213-3:2006(E)
4 Method of calculation
4.1 Principle
The method recommended uses equations which are based on the concept that pipeline quality natural gas
may be uniquely characterized for calculation of its volumetric properties by an appropriate and distinctive set
of measurable physical properties. These characteristics, together with the pressure and temperature, are
used as input data for the method.
The method uses the following physical properties: superior calorific value, relative density and carbon dioxide
content. The method is particularly useful in the common situation where a complete molar composition is not
available, but may also be preferred for its relative simplicity. For gases with a synthetic admixture, the
hydrogen content needs to be known.
4.2 The SGERG-88 equation
The calculation method using physical properties is
...