EN ISO 23874:2018

SLOVENSKI STANDARD
01-december-2018
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,62
Natural gas - Gas chromatographic requirements for hydrocarbon dewpoint calculation
(ISO 23874:2006)
Erdgas - Gaschromatographische Anforderungen für die Berechnung des Taupunktes
von Kohlenwasserstoff (ISO 23874:2006)
Gaz naturel - Exigences relatives à la chromatographie en phase gazeuse pour le calcul
du point de rosée hydrocarbures (ISO 23874:2006)
Ta slovenski standard je istoveten z: EN ISO 23874:2018
ICS:
71.040.50 Fizikalnokemijske analitske Physicochemical methods of
metode analysis
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23874
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2018
EUROPÄISCHE NORM
ICS 75.060
English Version
Natural gas - Gas chromatographic requirements for
hydrocarbon dewpoint calculation (ISO 23874:2006)
Gaz naturel - Exigences relatives à la chromatographie Erdgas - Gaschromatographische Anforderungen für
en phase gazeuse pour le calcul du point de rosée die Berechnung des Taupunktes von
hydrocarbures (ISO 23874:2006) Kohlenwasserstoff (ISO 23874:2006)
This European Standard was approved by CEN on 31 August 2018.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23874:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 23874:2006 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 23874:2018 by
Technical Committee CEN/TC 238 “Test gases, test pressures, appliance categories and gas appliance
types” the secretariat of which is held by AFNOR.
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 2019, and conflicting national standards shall
be withdrawn at the latest by March 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 23874:2006 has been approved by CEN as EN ISO 23874:2018 without any modification.
INTERNATIONAL ISO
STANDARD 23874
First edition
2006-11-15
Natural gas — Gas chromatographic
requirements for hydrocarbon dewpoint
calculation
Gaz naturel — Exigences relatives à la chromatographie en phase
gazeuse pour le calcul du point de rosée hydrocarbures

Reference number
ISO 23874:2006(E)
©
ISO 2006
ISO 23874:2006(E)
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ii © ISO 2006 – All rights reserved

ISO 23874:2006(E)
Contents Page
Foreword. iv
1 Scope.1
2 Normative references.1
3 Principle.2
4 Materials.2
5 Apparatus.2
6 Performance requirements .3
7 Sampling.3
8 Analytical procedure.4
9 Methods of test .7
10 Uncertainty in composition .9
11 Calculation of dewpoint temperature .9
12 Analytical uncertainty contribution to dewpoint temperature .9
Annex A (informative) Typical analytical conditions for C to C analysis .10
5 12
Annex B (informative) Validation of fraction data.12
Annex C (informative) Precision of area ratio .16
Annex D (informative) Recommendations on sample calibration gas introduction .20
Annex E (informative)  Calculation of fraction quantities, boiling points and component
uncertainties.22
Bibliography .26

ISO 23874:2006(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 23874 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of
natural gas.
iv © ISO 2006 – All rights reserved

INTERNATIONAL STANDARD ISO 23874:2006(E)

Natural gas — Gas chromatographic requirements for
hydrocarbon dewpoint calculation
1 Scope
This International Standard describes the performance requirements for analysis of treated natural gas of
transmission or pipeline quality in sufficient detail so that the hydrocarbon dewpoint temperature can be
calculated using an appropriate equation of state. It can be applied to gases that have maximum dewpoint
temperatures (cricondentherms) between 0 °C and – 50 °C. The pressures at which these maximum dewpoint
temperatures are calculated are in the range 2 MPa (20 bar) to 5 MPa (50 bar). Major components are
measured using ISO 6974 (all parts) and the ranges of components that can be measured are as defined in
ISO 6974-1. The procedure given in this International Standard covers the measurement of hydrocarbons in
the range C to C . n-Pentane, which is quantitatively measured using ISO 6974 (all parts), is used as a
5 12
bridge component and all C and higher hydrocarbons are measured relative to n-pentane.
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 6974-1, Natural gas — Determination of composition with defined uncertainty by gas chromatography —
Part 1: Guidelines for tailored analysis
ISO 6974-2, Natural gas — Determination of composition with defined uncertainty by gas chromatography —
Part 2: Measuring-system characteristics and statistics for processing of data
ISO 6974-3, Natural gas — Determination of composition with defined uncertainty by gas chromatography —
Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C using
two packed columns
ISO 6974-4, Natural gas — Determination of composition with defined uncertainty by gas chromatography —
Part 4: Determination of nitrogen, carbon dioxide and C to C and C hydrocarbons for a laboratory and on-
1 5 6+
line measuring system using two columns
ISO 6974-5, Natural gas — Determination of composition with defined uncertainty by gas chromatography —
Part 5: Determination of nitrogen, carbon dioxide and C to C and C hydrocarbons for a laboratory and on-
1 5 6+
line process application using three columns
ISO 6974-6, Natural gas — Determination of composition with defined uncertainty by gas chromatography —
Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C to C hydrocarbons using
1 8
three capillary columns
ISO 6975, Natural gas — Extended analysis — Gas-chromatographic method
ISO 10715, Natural gas — Sampling guidelines
ISO 23874:2006(E)
3 Principle
For hydrocarbon gas mixtures such as natural gas, the phase boundary or dewpoint line distinguishing single-
phase gas from gas-liquid mixtures is a complex function of pressure, temperature and composition. For a
given composition, the pressure at which the dewpoint temperature is at a maximum is intermediate between
those found in transmission and distribution operations. The analysis shall be comprehensive for inert
components and for hydrocarbons up to
...