SIST EN ISO 2613-2:2024

SLOVENSKI STANDARD
01-marec-2024
Analiza zemeljskega plina - Delež silicija v biometanu - 2. del: Določanje siloksana
s plinsko kromatografijo s spektroskopijo na osnovi mobilnosti ionov (GC-IMS)
(ISO 2613-2:2023)
Analysis of natural gas - Silicon content of biomethane - Part 2: Determination of
siloxane content by gas chromatography with ion mobility spectrometry (ISO 2613-
2:2023)
Analyse von Erdgas - Siliziumanteil von Biomethan - Teil 2: Bestimmung des
Siloxananteils durch gaschromatographische Ionenmobilitätsspektrometrie (ISO 2613-
2:2023)
Analyse du gaz naturel - Teneur en silicium du biométhane - Partie 2: Détermination de
la teneur en siloxane par chromatographie en phase gazeuse avec spectrométrie de
mobilité ionique (ISO 2613-2:2023)
Ta slovenski standard je istoveten z: EN ISO 2613-2:2023
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2613-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 75.060
English Version
Analysis of natural gas - Silicon content of biomethane -
Part 2: Determination of siloxane content by gas
chromatography with ion mobility spectrometry (ISO
2613-2:2023)
Analyse du gaz naturel - Teneur en silicium du Analyse von Erdgas - Siliziumanteil von Biomethan -
biométhane - Partie 2: Détermination de la teneur en Teil 2: Bestimmung des Siloxananteils durch
siloxane par chromatographie en phase gazeuse avec gaschromatographische Ionenmobilitätsspektrometrie
spectrométrie de mobilité ionique (ISO 2613-2:2023) (ISO 2613-2:2023)
This European Standard was approved by CEN on 19 November 2023.

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.

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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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2613-2:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2613-2:2023) has been prepared by Technical Committee ISO/TC 193 "Natural
gas" in collaboration with Technical Committee CEN/TC 408 “Natural gas and biomethane for use in
transport and biomethane for injection in the natural gas grid” 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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
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.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 2613-2:2023 has been approved by CEN as EN ISO 2613-2:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 2613-2
First edition
2023-11
Analysis of natural gas — Silicon
content of biomethane —
Part 2:
Determination of siloxane content by
gas chromatography with ion mobility
spectrometry
Analyse du gaz naturel — Teneur en silicium du biométhane —
Partie 2: Détermination de la teneur en siloxanes par
chromatographie en phase gazeuse avec spectrométrie de mobilité
ionique
Reference number
ISO 2613-2:2023(E)
ISO 2613-2:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 2613-2:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Materials . 3
5.1 Calibration gases. 3
5.2 Diluent gas . 3
5.3 Carrier and drift gas . 3
6 Apparatus . 3
7 Sampling . 4
7.1 General . 4
7.2 Safety precautions . 4
7.3 Temperature control . 4
7.4 Construction materials . 4
7.5 Cleanness . 5
7.6 Sampling of biomethane into vessels . 5
7.7 Installation of the calibration gas cylinder . 5
7.8 Pressure control . 5
7.9 Purging of wetted flow path . . 5
7.10 Flow control . 6
7.11 Diffusion control . 6
8 Calibration .6
8.1 Calibration procedure . 6
8.2 Frequency of calibration . 6
9 Measurement procedure . 6
9.1 Safety precautions . 6
9.2 Analysis . 6
10 Expression of results . 7
10.1 Quantities and units . 7
10.2 Uncertainty . 7
10.3 Test report . 7
Annex A (informative) Example of application . 8
Bibliography .10
iii
ISO 2613-2:2023(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
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
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
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
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expressions related to conformity assessment, as well as information about ISO's adherence to
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1,
Analysis of natural gas, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 408, Natural gas and biomethane for use in transport and biomethane for
injection in the natural gas grid, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 2613 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 2613-2:2023(E)
Introduction
This document describes a method for the determination of the siloxane content of biomethane that is
applicable to both laboratory and online analyses.
Siloxanes are a common contaminant in biogas, caused by their extensive use in common household
products such as cosmetics and detergents. These products eventually become entrained in waste
streams that are used to generate biogas. Additionally, siloxanes are sometimes added to digesters as
anti-foaming agents to improve generation efficiency.
If not effectively removed, siloxanes can cause damage to gas processing and vehicle injection
equipment through formation of silica deposits at high temperatures. Many gas distributors require
measurement reports to demonstrate that the resultant biomethane conforms with their requirements,
which typically includes siloxane content due to its potential to cause damage. Additionally, producers
may wish to monitor siloxane content for process optimisation purposes.
The technique described in this document is commercially available and tailored specifically to
measuring siloxanes within biomethane at low concentrations (for instance, as specified in EN 16723-
[10] [11]
1 and EN 16723-2 ). It is suitable for use both in the laboratory and field.
v
INTERNATIONAL STANDARD ISO 2613-2:2023(E)
Analysis of natural gas — Silicon content of biomethane —
Part 2:
Determination of siloxane content by gas chromatography
with ion mobility spectrometry
1 Scope
This document describes a gas chromatography – ion mobility spectroscopy (GC-IMS) method for
the determination of the concentration of siloxanes in biomethane. The method is applicable to the
following siloxanes:
— hexamethyldisiloxane (L2);
— octamethyltrisiloxane (L3);
— decamethyltetrasiloxane (L4);
— dodecamethylpentasiloxane (L5);
— hexamethylcyclotrisiloxane (D3);
— octamethylcyclotetrasiloxane (D4);
— decamethylcyclopentasiloxane (D5);
— dodecamethylcyclohexasiloxane (D6).
This document describes suitable calibration and measurement strategies to quantify siloxanes in (bio)
-3 -1
methane around and above the 0,3 mg m (14 µmol mol ) level and applies to analyses within absolute
1)
pressure ranges of 1 bar – 2 bar , temperatures of 0 °C – 40 °C and relative humidity < 90 %.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 6142-1, Gas analysis — Preparation of calibration gas mixtures — Part 1: Gravimetric method for Class
I mixtures
ISO 6143, Gas analysis — Comparison methods for determining and checking the composition of calibration
gas mixtures
ISO 6144, Gas analysis — Preparation of calibration gas mixtures — Static volumetric method
ISO 6145-1, Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 1:
General aspects
ISO 7504, Gas analysis — Vocabulary
ISO 10715, Natural gas — Gas sampling
5 2
1) 1 bar = 0,1 MPa =10 Pa; 1 MPa = 1 N/mm .
ISO 2613-2:2023(E)
ISO 10723, Natural gas — Performance evaluation for analytical systems
ISO 14532, Natural gas — Vocabulary
ISO 14912, Gas analysis — Conversion of gas mixture composition data
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
me a s ur ement (GUM: 1995)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC Guide 98-3, ISO 7504,
ISO 14532 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
ion mobility spectrometry
IMS
analytical method used to separate and identify ionised molecules in the gas phase based on their
mobility in a carrier gas under an electric field
4 Principle
A gaseous biomethane sample is drawn into a sample loop via a vacuum pump. The sample is injected
onto a GC column, which separates the individual components in t
...