EN ISO 23306:2020

SLOVENSKI STANDARD
01-december-2020
Specifikacija utekočinjenega zemeljskega plina kot goriva za uporabo v pomorstvu
(ISO 23306:2020)
Specification of liquefied natural gas as a fuel for marine applications (ISO 23306:2020)
Festlegungen für Flüssigerdgas als Kraftstoff für marine Anwendungen (ISO
23306:2020)
Spécification du gaz naturel liquéfié comme carburant pour les applications maritimes
(ISO 23306:2020)
Ta slovenski standard je istoveten z: EN ISO 23306:2020
ICS:
75.160.30 Plinska goriva Gaseous fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23306
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 75.160.30
English Version
Specification of liquefied natural gas as a fuel for marine
applications (ISO 23306:2020)
Spécification du gaz naturel liquéfié comme carburant Festlegungen für Flüssigerdgas als Kraftstoff für
pour les applications maritimes (ISO 23306:2020) marine Anwendungen (ISO 23306:2020)
This European Standard was approved by CEN on 22 September 2020.

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, 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, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23306:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 23306:2020) has been prepared by Technical Committee ISO/TC 28 "Petroleum
and related products, fuels and lubricants from natural or synthetic sources" 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 May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
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, 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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 23306:2020 has been approved by CEN as EN ISO 23306:2020 without any modification.

INTERNATIONAL ISO
STANDARD 23306
First edition
2020-10
Specification of liquefied natural gas
as a fuel for marine applications
Spécification du gaz naturel liquéfié comme carburant pour les
applications maritimes
Reference number
ISO 23306:2020(E)
©
ISO 2020
ISO 23306:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 23306:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 General requirements .2
5 Sampling .3
6 Requirements, limit values and related test methods .3
7 Main compounds removed by liquefaction process .4
Annex A (normative) Propane knock index: Methane number calculation method .6
Annex B (informative) Examples of LNG composition .12
Annex C (informative) Methane number (knock resistance) and Wobbe index (thermal
input through a restriction) .15
Annex D (informative) LNG ageing along the bunkering chain .17
Annex E (informative) Particles .18
Annex F (informative) Melting and boiling points of pure components and impurities that
can be present in different LNG.19
Bibliography .21
ISO 23306:2020(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.
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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels
and lubricants from natural or synthetic sources, Subcommittee SC 4, Classifications and specifications,
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).
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 2020 – All rights reserved

ISO 23306:2020(E)
Introduction
Due to numerous economic and environmental factors, the use of liquefied natural gas (LNG) as fuel
for marine applications has increased. The 0,10 % sulfur limit, in the sulfur emission controlled areas
in Europe and the US, which entered into force on 1 January 2015 has been one of the major driving
forces for using LNG as fuel for marine applications. The decision for the 0,50 % global sulfur limit from
1 January 2020 by the International Maritime Organization (IMO) might further increase the interest
in LNG. The International Code of Safety for Ships using Gases or other Low-flashpoint Fuels (IGF Code)
was a response to the need of guidance in this emerging market. Since LNG-fueled vessels are likely
to bunker LNG in different parts of the world, a common specification is needed for ship owners, ship
operators and LNG suppliers. It would help engine manufacturers and ship designers and it is beneficial
for the development of this new alternative marine fuel market.
In 2018, IMO adopted an initial strategy on reduction of greenhouse gas (GHG) emissions from ships.
The strategy includes the objective to peak GHG emissions from international shipping as soon as
possible, whilst pursuing efforts towards decarbonizing the sector as soon as possible in this century.
It also includes the objectives to reduce the CO emissions per transport work and total annual GHG
emissions from international shipping by 2050, with an interim target in 2030. Thus, LNG produced
from renewable sources as biomethane that can reduce CO emissions when used as marine fuel is also
addressed in this document.
LNG is produced in different locations in the world in liquefaction plants. Large scale production
facilities are often dedicated to specific markets such as natural gas grids and large power plants
that use their own standards. This document takes into consideration this major constraint for any
adaptation to marine applications specificities/requirements.
INTERNATIONAL STANDARD ISO 23306:2020(E)
Specification of liquefied natural gas as a fuel for marine
applications
1 Scope
This document specifies the quality requirements for Liquefied Natural Gas (LNG) used as a fuel for
marine applications. It defines the relevant parameters to measure as well as the required values and
the test reference methods for all those parameters.
This document applies to LNG from any source, e.g. gas from conventional reservoirs, shale gas, coalbed
methane, biomethane, synthetic methane. LNG described in this document can come from synthesis
process out of fossil fuels or renewable sources.
This document identifies the required sp
...