EN ISO 15403-1:2008

SLOVENSKI STANDARD
01-marec-2008
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Natural gas - Natural gas for use as a compressed fuel for vehicles - Part 1: Designation
of the quality (ISO 15403-1:2006)
Gaz naturel - Gaz naturel pour usage comme carburant comprimé pour véhicules -
Partie 1: Désignation de la qualité (ISO 15403-1:2006)
Ta slovenski standard je istoveten z: EN ISO 15403-1:2008
ICS:
75.060
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15403-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2008
ICS 75.060
English Version
Natural gas - Natural gas for use as a compressed fuel for
vehicles - Part 1: Designation of the quality (ISO 15403-1:2006)
Gaz naturel - Gaz naturel pour usage comme carburant
comprimé pour véhicules - Partie 1: Désignation de la
qualité (ISO 15403-1:2006)
This European Standard was approved by CEN on 15 December 2007.
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.
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15403-1:2008: E
worldwide for CEN national Members.

Foreword
The text of ISO 15403-1:2006 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 15403-1:2008 by Technical Committee CEN/SS N21 "Gaseous fuels and combustible gas",
the secretariat of which is held by CMC.

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 July 2008, and conflicting national
standards shall be withdrawn at the latest by July 2008.
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.
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 15403-1:2006 has been approved by CEN as EN ISO 15403-1:2008 without any
modifications.
INTERNATIONAL ISO
STANDARD 15403-1
First edition
2006-10-15
Natural gas — Natural gas for use
as a compressed fuel for vehicles —
Part 1:
Designation of the quality
Gaz naturel — Gaz naturel pour usage comme carburant comprimé
pour véhicules —
Partie 1: Désignation de la qualité

Reference number
ISO 15403-1:2006(E)
©
ISO 2006
ISO 15403-1:2006(E)
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ii © ISO 2006 – All rights reserved

ISO 15403-1:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Symbols and abbreviations .9
5 Gas composition requirements.10
6 Gas properties.11
7 Driveability.12
8 Test methods.12
9 Sampling.13
Annex A (informative) Propane and butane content .14
Annex B (informative) Wobbe index range.16
Annex C (informative) Engine knock.18
Annex D (informative) Methane number and octane number.19
Annex E (informative) Water content of natural gas.22
Bibliography .23

ISO 15403-1:2006(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 15403-1 was prepared by Technical Committee ISO/TC 193, Natural gas.
This first edition of ISO 15403-1 cancels and replaces ISO 15403:2000, of which it constitutes a minor revision
including the following changes:
⎯ correction of the title to reflect that ISO 15403 is now formed of two parts;
⎯ reformat the document in accordance with the ISO/IEC Directives, Part 2, Fifth edition, 2004;
⎯ reformat the references cited in Clause 2 and in the Bibliography, in accordance with the ISO/IEC
Directives, Part 2, Fifth edition, 2004.
ISO 15403 consists of the following parts, under the general title Natural gas — Natural gas for use as a
compressed fuel for vehicles:
⎯ Part 1: Designation of the quality
⎯ Part 2: Specification of the quality (Technical Report)

iv © ISO 2006 – All rights reserved

ISO 15403-1:2006(E)
Introduction
Natural gas has been used to some extent as a fuel for internal combustion engines in compressor stations,
co-generation systems, and vehicles of various types for many years now. However, the prerequisites for
growth, i.e. economic viability and fuel availability, were generally not satisfied. Now, with the natural gas
industry well established, supplying 20 % of the world's primary energy, and the need for alternative, low-
emission fuels, the situation has improved considerably. During the past decade, natural gas vehicles have
become a viable option with some five millions units now in use around the world. Growth is continuing as
many governments actively promote this clean-burning fuel with its environmental benefits. Many fleet
operators are converting their vehicles, and vehicle manufacturers are developing and marketing dedicated
natural gas equipment.
In the context of this International Standard, natural gas vehicles (NGVs) utilize compressed natural gas
stored “on-board”. The pressure of the gas stored in multiple containers is up to a maximum 25 000 kPa.
Although the pressure has to be reduced before combustion, compression and storage gives NGVs an
adequate range. While NGVs were initially equipped with converted gasoline or diesel engines, high-
performance, dedicated natural gas engines are now being extensively developed and produced. Liquefied
natural gas (LNG) may also be stored in the fuel tanks of natural gas vehicles. This, however, will be the
subject of a separate International Standard.
This part of ISO 15403 for the quality designation of compressed natural gas is designed to stipulate the
international requirements placed on the natural gas used as a motor fuel. Engine and vehicle manufacturers
must know these requirements so they can develop high-performance equipment which runs on compressed
natural gas.
A technical report giving detailed data on the gas compositions used in this part of ISO 15403 is being
published as ISO/TR 15403-2.
INTERNATIONAL STANDARD ISO 15403-1:2006(E)

Natural gas — Natural gas for use as a compressed fuel
for vehicles —
Part 1:
Designation of the quality
1 Scope
The aim of this part of ISO 15403 is to provide manufacturers, vehicle operators, fuelling station operators and
others involved in the compressed-natural-gas vehicle industry with information on the fuel quality for natural
gas vehicles (NGVs) required to develop and operate compressed-natural-gas vehicle equipment successfully.
Fuel meeting the requirements of this part of ISO 15403 should
a) provide for the safe operation of the vehicle and associated equipment needed for its fuelling and
maintenance;
b) protect the fuel system from the detrimental effects of corrosion, poisoning, and liquid or solid deposition;
c) provide satisfactory vehicle performance under any and all conditions of climate and driving demands.
Some aspects of this part of ISO 15403 may also be applicable for the use of natural gas in stationary
combustion engines.
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
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. Definitions were taken from
ISO 14532 whenever possible.
3.1
natural gas
complex mixture of hydrocarbons, primarily methane, but generally also including ethane, propane and higher
hydrocarbons in much smaller amounts and some non-combustible gases, such as nitrogen and carbon
dioxide
NOTE 1 Natural gas generally also includes minor amounts of trace constituents.
ISO 15403-1:2006(E)
NOTE
...