ISO 11982

Refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels — Liquefied Natural Gas (LNG) as marine fuel — Measurement on board LNG bunkering ship

The proposed document gives guidance for quantification of liquefied natural gas (LNG) as marine fuel on board LNG bunkering ships. It is applicable to the measurement of LNG from any source, e.g. gas from conventional reservoirs, shale gas, coalbed methane, at the time of - Ship to Ship (STS) transfer to LNG-fuelled ships, - Ship to Ship (STS) transfer between LNG bunkering ships, and - transfer to or from shore tanks or other facilities, with no regard to the type of tanks. This document is also applicable to the quantification of biomethane and synthetic methane from fossil fuels or renewable sources.

Hydrocarbures réfrigérés et combustibles gazeux liquéfiés à base non pétrolière — Utilisation du Gaz Naturel Liquéfié (GNL) comme combustible marin — Mesurage à bord des navires avitailleurs de GNL

General Information

• Status: Not Published
• ICS: 75.180.30 - Volumetric equipment and measurements
• Technical Committee: ISO/TC 28/SC 5 - Measurement of refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels
• Drafting Committee: ISO/TC 28/SC 5 - Measurement of refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels
• Current Stage: 6000 - International Standard under publication
• Start Date: 11-Sep-2025
• Completion Date: 13-Sep-2025

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/FDIS 11982
ISO/TC 28/SC 5
Refrigerated hydrocarbon and non-
Secretariat: JISC
petroleum based liquefied gaseous
Voting begins on:
fuels — Liquefied Natural Gas (LNG)
2025-07-16
as marine fuel — Measurement on
Voting terminates on:
board LNG bunkering ship
2025-09-10
Hydrocarbures réfrigérés et combustibles gazeux liquéfiés à
base non pétrolière — Utilisation du Gaz Naturel Liquéfié (GNL)
comme combustible marin — Mesurage à bord des navires
avitailleurs de GNL
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 11982:2025(en) © ISO 2025

FINAL DRAFT
ISO/FDIS 11982:2025(en)
International
Standard
ISO/FDIS 11982
ISO/TC 28/SC 5
Refrigerated hydrocarbon and non-
Secretariat: JISC
petroleum based liquefied gaseous
Voting begins on:
fuels — Liquefied Natural Gas (LNG)
as marine fuel — Measurement on
Voting terminates on:
board LNG bunkering ship
Hydrocarbures réfrigérés et combustibles gazeux liquéfiés à
base non pétrolière — Utilisation du Gaz Naturel Liquéfié (GNL)
comme combustible marin — Mesurage à bord des navires
avitailleurs de GNL
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 11982:2025(en) © ISO 2025

ii
ISO/FDIS 11982:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 On-board measurement . 4
4.1 Outline .4
4.2 Static measurement .5
4.2.1 General .5
4.2.2 Tank capacity table .5
4.2.3 Custody transfer measurement system (CTMS) .6
4.3 Dynamic measurement .7
4.3.1 General .7
4.3.2 Dynamic measurement equipment performance .7
4.3.3 Calibration . . .7
4.3.4 Measurement .7
5 On-board sampling . 8
6 Analysis . . 8
6.1 General .8
6.2 Online analysis .8
7 Calculation method . 8
7.1 General .8
7.2 Static measurement .9
7.2.1 General .9
7.2.2 Liquid level . . .10
7.2.3 Liquid and vapour temperature .10
7.2.4 Vapour pressure . .10
7.2.5 Trim and list .10
7.3 Dynamic measurement .10
7.4 Energy calculation .10
7.4.1 Liquid energy .10
7.4.2 Vapour energy . 12
7.4.3 Wobbe index .14
7.5 Methane number calculation .14
Annex A (informative) Processing of CTMS data .15
Annex B (informative) Calculation example . 19
Annex C (informative) Treatment of unsupported components .29
Annex D (informative) Example of parameters in a bunker delivery note .30
Annex E (informative) Estimation of the composition of comingled LNG.31
Bibliography .36

iii
ISO/FDIS 11982:2025(en)
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 document 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 cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 5, Measurement of refrigerated hydrocarbon
and non-petroleum based liquefied gaseous fuels.
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/FDIS 11982:2025(en)
Introduction
[23]
Efforts such as the restriction of sulfur content in marine fuel oil introduced by IMO MARPOL ANNEX IV
and growing trends towards decarbonisation have promoted cleaner marine fuel.
Liquefied natural gas (LNG) is one of the most practical marine fuel choices. It is considered cleaner than
conventional fuel oils. The conventional trade volume of LNG transported by one shipment is large, with
a total capacity of 170 000 m at the time of publication of this document. The trade quantity is calculated
according to the method defined by the sales and purchase agreement between the cargo supplier and
receiver.
On the other hand, the trade quantity of LNG as a marine fuel by one shipment can be smaller than the
conventional trade volume of 170 000 m . Furthermore, the LNG containment system of the LNG bunkering
ship is unlike the systems of conventional LNG carriers, especially the pressure in the tanks, which is
relatively higher than that of the conventional carrier type. Tank type
...

Formatted: Centered
ISO/FDIS 11982:2024(E2025(en)
Style Definition: zzCopyright
Style Definition: Unresolved Mention1
ISO TC 28/SC 5/WG 7
Style Definition: Hashtag1
Secretariat: JISC
Style Definition: Mention1
Style Definition: Smart Hyperlink1
Date: 2024-11-292025-07-01
Formatted: French (Switzerland)
Refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels –— Liquefied Natural
Formatted: Right: 1 cm
Gas (LNG) as marine fuel –— Measurement on board LNG bunkering ship
Formatted: French (Switzerland)
Hydrocarbures réfrigérés et combustibles gazeux liquéfiés à base non pétrolière — Utilisation du Gaz
Naturel Liquéfié (GNL) comme combustible marin — Mesurage à bord des navires avitailleurs de GNL
Formatted: Centered
ISO/FDIS 11982:2024(E)
Formatted: Font: 11 pt
Formatted: Justified, Space After: 30 pt, Line spacing:
Exactly 11 pt
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no
Before: 0 pt, No page break before, Adjust space
part of this publication may be reproduced or utilized otherwise in any form or by any means,
between Latin and Asian text, Adjust space between
electronic or mechanical, including photocopying, or posting on the internet or an intranet, without
Asian text and numbers
prior written permission. Permission can be requested from either ISO at the address below or
ISO’sISO's member body in the country of the requester. Formatted: Default Paragraph Font
ISO copyright officeCopyright Office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
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cm, Adjust space between Latin and Asian text, Adjust
Phone: + 41 22 749 01 11 space between Asian text and numbers
Email: [e-mail]
Email: [e-mail]
Website: www.iso.orgwww.iso.org
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cm, Adjust space between Latin and Asian text, Adjust
Published in Switzerland.
space between Asian text and numbers
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pt
ii © ISO 2024 – All rights reserved

ISO/FDIS 11982:2024(E2025(en)
Formatted: Font: 11 pt
Formatted: Centered
Formatted: Font: 11 pt
Contents Formatted: Tab stops: Not at 17.2 cm
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 On board measurement . 5
4.1 Outline . 5
4.2 Static Measurement. 5
4.3 Dynamic measurement . 7
5 On board sampling . 7
6 Analysis. 8
6.1 General . 8
6.2 Online analysis . 8
7 Calculation method . 8
7.1 General . 8
7.2 Static measurement . 9
7.3 Dynamic measurement . 10
7.4 Energy calculation . 10
7.5 Methane Number calculation . 13
Annex A (informative) Data processing of CTMS data . 14
A.1 Raw data . 14
Annex B (informative) Calculation example . 17
Annex C (informative) Density calculation for unsupported components . 24 Formatted: Normal, Centered, Line spacing: single,
Tab stops: 17.2 cm, Right
Annex D (informative) Example of parameters of BDN . 25
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iii
ISO/FDIS 11982:2024(E)
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Exactly 11 pt
Formatted: Font: 11 pt
Annex E (informative) Estimation of the composition of comingled LNG . 26
Bibliography . 29
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 On-board measurement . 5
4.1 Outline . 5
4.2 Static measurement . 5
4.2.1 General . 5
4.2.2 Tank capacity table . 6
4.2.3 Custody transfer measurement system (CTMS) . 6
4.3 Dynamic measurement . 8
4.3.1 General . 8
4.3.2 Dynamic measurement equipment performance. 8
4.3.3 Calibration . 8
4.3.4 Measurement . 8
5 On-board sampling . 9
6 Analysis . 9
6.1 General . 9
6.2 Online analysis . 9
7 Calculation method . 9
7.1 General . 9
7.2 Static measurement . 11
7.2.1 General . 11
7.2.2 Liquid level . 11
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7.2.3 Liquid and vapour temperature . 11
pt
iv © ISO 2024 – All rights reserved

ISO/FDIS 11982:2024(E2025(en)
Formatted: Font: 11 pt
Formatted: Centered
Formatted: Font: 11 pt
7.2.4 Vapour pressure . 11
7.2.5 Trim and list . 11
7.3 Dynamic measurement . 12
7.4 Energy calculation . 12
7.4.1 Liquid energy . 12
7.4.2 Vapour energy . 15
7.4.3 Wobbe index . 18
7.5 Methane number calculation . 18
Annex A (informative) Processing of CTMS data . 20
Annex B (informative) Calculation example . 25
Annex C (informative) Treatment of unsupported components . 40
Annex D (informative) Example of parameters in a bunker delivery note . 41
Annex E (informative) Estimation of the composition of comingled LNG . 43
Bibliography . 50

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Tab stops: 17.2 cm, Right
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v
ISO/FDIS 11982:2024(E)
Formatted: Justified, Space After: 30 pt, Line spacing:
Exactly 11 pt
Formatted: Font: 11 pt
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 p
...