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International
Standard
ISO 6919
First edition
Measurement of refrigerated
2024-07
hydrocarbon and non-petroleum
based liquefied gaseous fuels —
Dynamic measurement of liquefied
natural gas (LNG) as marine fuel —
Truck-to-ship (TTS) bunkering
Mesurage des combustibles gazeux liquéfiés réfrigérés à
base d'hydrocarbures ou à base non pétrolière — Mesurage
dynamique du gaz naturel liquéfié (GNL) en tant que combustible
marin — Soutage de camion à navire
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements and safety precautions . 4
5 Measurement systems and equipment . 4
5.1 General .4
5.2 Portable packaging measurement system .4
5.3 Metrological requirements for measurement .7
5.3.1 Coriolis flow meter installation requirements .7
5.3.2 Gas chromatography apparatus requirement .7
5.4 Measurement system verification . .7
5.4.1 Coriolis flow meter system verification .7
5.4.2 Gas chromatography system verification .7
5.5 Equipment maintenance and testing .7
6 Measurement procedures . 7
6.1 Coriolis mass flowmeter procedures .7
6.1.1 General .7
6.1.2 Quantity measurement procedures .8
6.1.3 Quantity measurement documentation .9
6.1.4 MFM system failure and quantity dispute .9
6.2 Gas chromatography procedures . .9
6.2.1 General .9
6.2.2 Quality measurement procedures .10
6.2.3 Quality measurement documentation .10
6.2.4 Calibration . . .10
6.3 LNG energy calculation .10
6.4 Measurement report.10
Annex A (informative) Energy value calculation .12
Annex B (informative) LNG bunker delivery note . 14
Annex C (informative) Bunker metering ticket .16
Annex D (informative) LNG Bunker checklist TTS . 17
Annex E (informative) Mass flow metering system seals checklist .24
Annex F (informative) Meter reading record form (delivery) .25
Bibliography .26
iii
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
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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
International Standard ISO 6919:2024(en)
Measurement of refrigerated hydrocarbon and non-
petroleum based liquefied gaseous fuels — Dynamic
measurement of liquefied natural gas (LNG) as marine fuel —
Truck-to-ship (TTS) bunkering
1 Scope
This document defines procedures and requirements for measuring liquefied natural gas (LNG) from truck-
to-ship (TTS) using the combination of Coriolis mass flowmeter (MFM) and gas chromatography (GC). It
also gives guidance and requirements for portable packaging of the combination system in mobile form
which minimizes facility storage space and streamlines the use of development systems. Output from the
system in calorie units is applicable to commercial transactions between suppliers and users of liquefied
natural gas (LNG) as marine fuel.
This document also consists of general requirements, metrological requirements, system flawless
requirements, requirements and test methods, and procedures for measurement methods.
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 6974-1:2012, Natural gas — Determination of composition and associated uncertainty by gas
chromatography — Part 1: General guidelines and calculation of composition
ISO 22192:2021, Bunkering of marine fuel using the Coriolis mass flow meter (MFM) system
ISO 10790:2015, Measurement of fluid flow in closed conduits — Guidance to the selection, installation and use
of Coriolis flowmeters (mass flow, density and volume flow measurements)
ISO 6976:2016, Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from
composition
ISO 21903, Refrigerated hydrocarbon fluids — Dynamic measurement — Requirements and guidelines for
the calibration and installation of flowmeters used for liquefied natural gas (LNG) and other refrigerated
hydrocarbon fluids
ISO 6578:2017, Refrigerated hydrocarbon liquids — Static measurement — Calculation procedure
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
bunker
fuel supplied to a vessel for its propulsion and/or operation
Note 1 to entry: The fuel in this document is Class F, as specified in ISO 8217.
3.2
bunker delivery note
BDN
proprietary document of the bunker supplier providing details of the quality and quantity of the bunker(s)
delivered by the truck to the receiving ship
3.3
bunker metering ticket
ticket printed at the end of bunkering operation
3.4
bunkering operation
transfer operation between the truck and receiving ship
3.5
bunker supplier
company which contractually agrees with the buyer to deliver the product
3.6
bunker surveyor
person who inspects, measures, samples, investigates and reports as required on the bunkering operations (3.4)
3.7
LNG representative
individual who represents the bunker supplier (3.5) and is responsible for bunkering operations (3.4) and
documentations
3.8
calibration
operation that, under specified conditions, in a first step, establishes a relation between the quantity values
with measurement uncertainties provided by measurement standards and corresponding indications with
associated measurement uncertainties and, in a second step, uses this information to establish a relation for
obtaining a measurement result from an indication
[SOURCE: ISO/IEC Guide 99:2007, 2.39, modified — notes to entry have been deleted.]
3.9
chief engineer
high-level technical position for receiving bunkers and documentation of the bunkering operation (3.4) on
the vessel
3.10
container
portable tank unit
3.11
expanded uncertainty
quantity defining an interval about
...