EN ISO 20519:2022
(Main)Ships and marine technology - Specification for bunkering of liquefied natural gas fuelled vessels (ISO 20519:2021)
Ships and marine technology - Specification for bunkering of liquefied natural gas fuelled vessels (ISO 20519:2021)
This document specifies requirements for LNG bunkering transfer systems and equipment used to bunker LNG fuelled vessels, which are not covered by the IGC Code. This document is applicable to vessels involved in international and domestic service regardless of size, and addresses the following five elements:
a) hardware: liquid and vapour transfer systems;
b) operational procedures;
c) requirement for the LNG provider to provide an LNG bunker delivery note;
d) training and qualifications of personnel involved;
e) requirements for LNG facilities to meet applicable ISO standards and local codes.
Schiffe und Meerestechnik - Spezifikation für das Bunkern flüssigerdgasbetriebener Schiffe (ISO 20519:2021)
Dieses Dokument legt Anforderungen für LNG-Bunkerübergabesysteme und Ausrüstung zum Bunkern von LNG-betriebenen Wasserfahrzeugen fest, die nicht durch den IGC-Code abgedeckt sind. Dieses Dokument gilt für Wasserfahrzeuge die im internationalen als auch im nationalen Verkehr zum Einsatz kommen, unabhängig von ihrer Größe und umfasst die folgenden fünf Elemente:
a) Hardware: Flüssigkeits- und Gas-Übergabesysteme;
b) Betriebsweisen;
c) Anforderung an den LNG-Bunkerlieferanten, einen LNG-Bunker-Lieferschein bereitzustellen;
d) Schulung und Qualifikation der beteiligten Mitarbeiter;
e) Anforderungen an LNG-Anlagen zur Einhaltung der geltenden ISO-Normen und örtlichen Vorschriften.
Navires et technologie maritime - Spécification pour le soutage des navires fonctionnant au gaz naturel liquéfié (ISO 20519:2021)
Le présent document établit les exigences applicables aux équipements et systèmes de transfert de GNL utilisés pour le soutage de navires fonctionnant au GNL, qui ne sont pas couverts par le Code IGC. Ce document peut être utilisé à la fois pour les navires participant au transport international et domestique, quelle que soit leur taille et comprend les cinq éléments suivants:
a) matériel: systèmes de transfert de liquide et de vapeur;
b) procédures opérationnelles;
c) exigence pour le fournisseur de GNL de fournir un bon de livraison de soute de GNL;
d) formation et qualifications du personnel intervenant;
e) exigence pour les installations de GNL de respecter les normes ISO et les codes locaux applicables.
Ladjarska in pristaniška tehnologija - Specifikacija za oskrbovanje plovil na utekočinjeni zemeljski plin (ISO 20519:2021)
Ta dokument določa zahteve za oskrbovanje pretakališč in opreme za utekočinjeni zemeljski plin, ki se uporabljajo za oskrbovanje plovil na utekočinjeni zemeljski plin, ki niso zajeta v kodeksu IGC. Ta dokument se uporablja za plovila, ki opravljajo mednarodne in domače prevoze, ne glede na velikost, in obravnava naslednjih
pet elementov:
a) strojna oprema: sistemi za prenos tekočin in hlapov;
b) operativni postopki;
c) zahteva, da dobavitelj utekočinjenega zemeljskega plina predloži potrdilo o dobavi za rezervoar utekočinjenega zemeljskega plina;
d) usposabljanje in kvalifikacije vključenega osebja;
e) zahteve, da objekti za utekočinjeni zemeljski plin izpolnjujejo veljavne standarde ISO in lokalne predpise.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2022
Nadomešča:
SIST EN ISO 20519:2017
Ladjarska in pristaniška tehnologija - Specifikacija za oskrbovanje plovil na
utekočinjeni zemeljski plin (ISO 20519:2021)
Ships and marine technology - Specification for bunkering of liquefied natural gas fuelled
vessels (ISO 20519:2021)
Schiffe und Meerestechnik - Spezifikation für das Bunkern flüssigerdgasbetriebener
Schiffe (ISO 20519:2021)
Navires et technologie maritime - Spécification pour le soutage des navires fonctionnant
au gaz naturel liquéfié (ISO 20519:2021)
Ta slovenski standard je istoveten z: EN ISO 20519:2022
ICS:
47.020.99 Drugi standardi v zvezi z Other standards related to
ladjedelništvom in shipbuilding and marine
konstrukcijami na morju structures
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 20519
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 47.020.99 Supersedes EN ISO 20519:2017
English Version
Ships and marine technology - Specification for bunkering
of liquefied natural gas fuelled vessels (ISO 20519:2021)
Navires et technologie maritime - Spécification pour le Schiffe und Meerestechnik - Spezifikation für das
soutage des navires fonctionnant au gaz naturel Bunkern flüssigerdgasbetriebener Schiffe (ISO
liquéfié (ISO 20519:2021) 20519:2021)
This European Standard was approved by CEN on 23 February 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20519:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 20519:2022) has been prepared by Technical Committee ISO/TC 8 "Ships and
marine technology" in collaboration with Technical Committee CEN/TC 282 “Installation and
equipment for LNG” 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 November 2022, and conflicting national standards
shall be withdrawn at the latest by November 2022.
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 supersedes EN ISO 20519:2017.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20519:2021 has been approved by CEN as EN ISO 20519:2022 without any modification.
INTERNATIONAL ISO
STANDARD 20519
Second edition
2021-12
Ships and marine technology —
Specification for bunkering of
liquefied natural gas fuelled vessels
Navires et technologie maritime — Spécification pour le soutage des
navires fonctionnant au gaz naturel liquéfié
Reference number
ISO 20519:2021(E)
ISO 20519:2021(E)
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 20519:2021(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 5
5 Transfer system design requirements . 5
5.1 Vessel requirements . 5
5.2 Facility requirements . 6
5.3 Bunker transfer equipment requirements . 6
5.4 Emergency shutdown and release systems . 6
5.5 Specific requirements . 8
5.5.1 System support . 8
5.5.2 Hoses, corrugated metallic or composite . 8
5.5.3 Transfer arms . 9
5.5.4 Bunkering connections . 9
5.5.5 Dry-disconnect/connect coupling . 9
5.5.6 Insulation flange . 10
5.5.7 Fall arrest . 10
5.6 Identification of transfer equipment . 10
5.7 Transfer system design analysis . 11
5.7.1 General . 11
5.7.2 Additional items to be considered to meet the requirements of 5.4.5 . 11
5.8 Maintenance . 11
5.9 Maintenance manual . 12
6 LNG bunkering processes and procedures .12
6.1 Mooring . 12
6.2 Communication in preparation for a transfer .12
6.3 Risk assessments . 13
6.3.1 General .13
6.3.2 Risk assessment . 14
6.3.3 Conditions considered . 14
6.3.4 Assessment methodology . 14
6.3.5 Acceptable bunkering parameters . 14
6.4 Vessel safety assessments . 14
6.5 Bunkering transfer procedures . 15
7 Management system and quality assurance .16
7.1 Management systems . 16
7.2 Management systems for transfer equipment manufacturers . 16
8 Personnel training .16
8.1 Vessel personnel training requirements . 16
8.2 Additional training requirements for personnel involved in bunkering operations
on vessels . 17
8.2.1 General . 17
8.2.2 Personnel providing LNG from port or mobile facilities training . 17
8.3 Documentation of training . 17
9 Records and documentation .17
Annex A (normative) LNG bunker checklists.19
Annex B (informative) Risk assessment and controlled zones .28
iii
ISO 20519:2021(E)
Annex C (informative) Illustrations of a typical LNG transfer system and
functional diagrams of EDS and ERS subsystems .33
Bibliography .36
iv
ISO 20519:2021(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 8, Ships and marine technology, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC
282, Installation and Equipment for LNG, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 20519:2017), which has been technically
revised.
The main changes are as follows:
— in 5.5.5, dry connect and disconnect couplings, if used, are required to meet the applicable
requirements of ISO 21593, however, it is permitted to use, under specified conditions, couplings
manufactured before the publication of ISO 21593;
— in 6.2.2 a), if flowmeters are used to measure LNG being bunkered, the LNG provider to inform the
party receiving the LNG if the flowmeter conforms to ISO 21903.
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.
v
ISO 20519:2021(E)
Introduction
This document has been produced to meet an industry need identified by the International Maritime
Organization (IMO). It has been designed to support the IMO International Code of Safety for Ships
using Gases or other Low-flashpoint Fuels (IGF Code).
Due to numerous economic and environmental factors, the use of liquefied natural gas (LNG) as a
vessel’s fuel has increased. While LNG fuelled ships and vessels have been in service since the early
2000s, most of these vessels have operated within small defined areas using LNG bunkering operations
designed for that particular vessel service. The increase in LNG fuelled vessels corresponds with
an increase in the number of the regions that these vessels service. Therefore, there is a need to
standardize LNG bunkering operations internationally to a reasonable degree so that vessel operators
have the tools to select vessel fuel providers that meet set safety and fuel quality standards for LNG
bunkering operations to be conducted safely.
This document can be applied in many situations and under various regulatory regimes. Existing
regulations can cover the topics addressed in this document.
vi
INTERNATIONAL STANDARD ISO 20519:2021(E)
Ships and marine technology — Specification for
bunkering of liquefied natural gas fuelled vessels
1 Scope
This document specifies requirements for LNG bunkering transfer systems and equipment used to
bunker LNG fuelled vessels, which are not covered by the IGC Code. This document is applicable to
vessels involved in international and domestic service regardless of size, and addresses the following
five elements:
a) hardware: liquid and vapour transfer systems;
b) operational procedures;
c) requirement for the LNG provider to provide an LNG bunker delivery note;
d) training and qualifications of personnel involved;
e) requirements for LNG facilities to meet applicable ISO standards and local codes.
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 16904, Petroleum and natural gas industries — Design and testing of LNG marine transfer arms for
conventional onshore terminals
ASME B16.5, Pipe flanges and flanged fittings: NPS 1/2 through NPS 24 metric/inch standard
BS 4089, Specification for metallic hose assemblies for liquid petroleum gases and liquefied natural gases
EN 1474-2, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Design and testing of transfer hose
EN 1474-3, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Offshore transfer systems
EN 12434, Cryogenic vessels — Cryogenic flexible hoses
IEC 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres
IMO, International Code of Safety for Ships using Gases or other Low-flashpoint Fuels (IGF Code)
IMO, International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC
Code)
Oil Companies International Marine Forum, Design and Construction Specification for Marine Loading
Arms. Third edition, 1999. London, England: Oil Companies International Marine Forum
Society of International Gas Tanker and Terminal Operators (SIGTTO), ESD Arrangements & Linked Ship/
Shore Systems for Liquefied Gas Carriers [online]. First edition, 2009. Scotland, UK: Witherby Seamanship
International Ltd
ISO 20519:2021(E)
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
bunkering
operation of transferring LNG fuel to a vessel (3.24)
Note 1 to entry: For the purposes of this document, it refers to the delivery of LNG (3.12) only. This document
does not address the transfer of CNG, propane or fuels other than LNG that can be covered by the IGF Code
(see Clause 4).
3.2
bunkering terminal
fixed operation on or near shore that is not regulated as a vessel (3.24), and that can be used to provide
LNG bunkers to a receiving vessel
3.3
classification
process in which the design and condition of a vessel (3.24) is evaluated to determine its compliance
with rules and standards developed by the Classification Society (3.4) issuing the classification
3.4
Classification Society
non-governmental organization that establishes and maintains technical standards for the construction
and operation of ships and offshore structures
Note 1 to entry: They also validate that construction is according to these standards and carry out regular
surveys in service to verify compliance with the standards.
3.5
competent authority
legal authority within a member state that has jurisdiction over maritime or port activities within that
state
3.6
controlled zones
areas extending from the bunkering manifolds on the LNG receiving vessel (3.24) and the LNG supply
source during LNG bunkering operations that have restrictions in place
Note 1 to entry: These restrictions include limitation on personnel access, sources of ignition and unauthorized
activities. The controlled zones are subdivided into hazardous zones, safety zones (3.22) and the monitoring and
security areas (3.16) as defined in Annex B.
3.7
dry connection and disconnection
method that reduces LNG (3.12) or natural gas releases into the atmosphere under normal operation to
a negligible amount consistent with safety, either by equipment design or procedural practice
3.8
dry-disconnect/connect coupling
DD/CC
mechanical device used to connect the hose bunkering system to an LNG fuel manifold without
employing bolts
ISO 20519:2021(E)
3.9
emergency release coupling
ERC
break-away coupling
coupling installed on LNG (3.12) and vapour lines, as a component of ERS, to ensure the quick physical
disconnection of the transfer system from the unit to which it is connected, designed to prevent damage
to loading/unloading equipment in the event that the transfer system’s operational envelope and/or
parameters are exceeded beyond a predetermined point
3.10
emergency release system
ERS
system that provides a safe shut down, transfer system isolation and quick release of hoses or transfer
arms (3.21) between the facility or vessel (3.24) providing the LNG (3.12), and the vessel receiving the
LNG, preventing product release at disconnection time
Note 1 to entry: The ERS consists of an emergency release coupling (ERC) (3.9) and interlocked isolating valves
that automatically close on both sides, thereby containing the LNG or vapour in the lines (dry disconnect), and, if
applicable, associated control system.
3.11
emergency shutdown system
ESD
system that safely and effectively stops the transfer of LNG (3.12) and vapour between the facility or
vessel (3.24) providing the LNG and the vessel receiving the LNG, or vice versa
3.12
liquefied natural gas
LNG
natural gas that has been cooled and condensed into liquid form
Note 1 to entry: It is characterized as a cryogenic liquid having a temperature typically around −161 °C under
normal atmospheric pressure.
3.13
lower flammable limit
LFL
concentration of flammable gas or vapour in air below which there is insufficient amount of substance
to support and propagate combustion
3.14
management system
set of procedures an organization needs to follow in order to meet its objectives
3.15
mobile facility
facility used to transfer LNG (3.12) to a vessel (3.24)
EXAMPLE Trucks, rail car or other mobile devices (including portable tanks).
3.16
monitoring and security area
area around the bunkering facility and vessel (3.24), where vessel traffic and other activities are
monitored to mitigate harmful effects
3.17
nozzle
half part of the coupling, typically mounted on the hose bunkering system of the bunker facility, that
permits dry connection and disconnection (3.7) of the LNG bunkering system to the receptacle (3.18) of
the receiving vessel (3.24) in a safe manner
ISO 20519:2021(E)
3.18
receptacle
half part of the coupling, typically mounted to the manifold flange of the receiving vessel (3.24), that
permits dry connection and disconnection (3.7) in a safe manner
3.19
recognized organization
competent organization with delegated authority on behalf of an Administration to assist in the uniform
and effective implementation of IMO Codes and Conventions
Note 1 to entry: Adapted from IMO A.739 (18).
3.20
LNG transfer system
equipment contained between the bunkering manifold flange on the facility or vessel (3.24) providing
LNG fuel and the bunkering manifold flange on the receiving LNG fuelled vessel, including but not
limited to: vessel to vessel transfer arms (3.21), LNG transfer arms (articulated rigid piping) or hoses,
emergency release system (ERS) (3.10), insulation flanges, dry-disconnect/connect couplings (DD/CC)
(3.8), and in addition the ESD ship/shore or ship/ship link used to connect the supplying and receiving
ESD systems
Note 1 to entry: Illustrations of a typical LNG transfer system and subsystems are provided in Figures C.1 to C.4.
3.21
transfer arm
articulated metal transfer system used for transferring LNG (3.12) to the vessel (3.24) being bunkered
Note 1 to entry: It can be referred to as a “loading arm” or “unloading arm”.
3.22
safety zone
area around the bunkering station where only dedicated and essential personnel and activities are
allowed during bunkering (3.1)
3.23
security zone
area established by the national or local authorities around a bunkering facility or area through which
vessel (3.24) and personnel movement is subject to regulatory restrictions
3.24
vessel
ship, barge (self-propelled or no propulsion) or boat of any size in domestic or international service
Note 1 to entry: A bunkering vessel is a vessel used to transport LNG (3.12) to a vessel using LNG as a fuel.
Note 2 to entry: A receiving vessel is a vessel that uses LNG as a fuel and does not transport LNG as a cargo.
ISO 20519:2021(E)
4 Abbreviated terms
Term Description Explanation
IGC International Maritime Organization’s The IGC Code applies to ships involved in the carriage of bulk
Code International Code for the liquefied gases, and prescribes the design and construction
Construction and Equipment of Ships standards of ships involved in such carriage and the equipment
Carrying Liquefied Gases in Bulk they should carry.
IGF International Maritime Organization’s The IGF Code applies to ships fuelled by gases or other
Code International Code of Safety for Ships low-flashpoint fuels. The Code contains mandatory provisions
using Gases or other Low-flashpoint for the arrangement, installation, control and monitoring of
Fuels, 2017 machinery, equipment and systems using low-flashpoint fuels.
IACS International Association Organization that establishes, reviews, promotes and develops
of Classification Societies minimum technical requirements in relation to the design,
construction, maintenance and survey of ships and other
marine related facilities; it assists international regulatory
bodies and standards organizations to develop, implement and
interpret statutory regulations and industry standards in ship
design, construction and maintenance, with a view to improv-
ing safety at sea and the prevention of marine pollution.
IMO International Maritime Organization Specialized agency of the United Nations whose purpose is
“to provide machinery for cooperation among governments
in the field of governmental regulation and practices relating
to technical matters of all kinds affecting shipping engaged
in international trade; to encourage and facilitate the general
adoption of the highest practicable standards in matters con-
cerning efficiency of navigation, and prevention and control of
marine pollution from ships.”
ISM International Safety Management IMO code that provides an international standard for the safe
Code management and operation of ships, and for pollution preven-
tion.
STCW International Convention on Convention that promotes the safety of life and property at sea
Standards of Training, Certification and the protection of the marine environment, by establishing
and Watchkeeping for Seafarers in common agreement international standards of training,
certification and watchkeeping for seafarer.
SGMF Society for Gas as a Marine Fuel Non-governmental organization established to promote safety
and industry best practice in the use of gas as a marine fuel.
5 Transfer system design requirements
5.1 Vessel requirements
5.1.1 In order to be compliant with this document, vessels involved shall meet the following
requirements (this applies to vessels of all sizes, in domestic or international service).
5.1.2 Bunkering vessels shall conform with this document and be approved by its Flag State,
recognized organization or Classification Society that complies with the applicable uniform
interpretations and requirements posted by IACS, indicating that it meets, at a minimum, the applicable
requirements of the IGC Code, this document and applicable Flag State requirements.
5.1.3 Receiving vessels shall conform with this document and be approved by their Flag State,
recognized organization or Classification Society that complies with the applicable uniform
interpretations and requirements posted by IACS, indicating that it meets, at a minimum, the applicable
requirements of the IGF Code, this document and applicable Flag State requirements.
ISO 20519:2021(E)
5.2 Facility requirements
5.2.1 Mobile facilities (e.g. tank trucks, rail cars and portable tanks) including their tanks, piping,
hoses, pumps and valves shall be fabricated to meet the requirements of ISO or recognized national
standards for handling cryogenic liquids.
5.2.2 The bunkering terminal shall conform to local codes. If local codes do not address LNG
bunkering terminals, the terminal operator shall obtain a document issued by a competent organization
or individual, such as a qualified engineer, confirming the terminal conforms to the applicable sections
of ISO standards or national standards, or follows the guidance published by SGMF.
5.3 Bunker transfer equipment requirements
5.3.1 All equipment used in the transfer system shall meet the requirements defined for that specific
piece of equipment as prescribed in 5.3 to 5.5. The use of liquid nitrogen as a substitute for LNG during
testing of the equipment by the equipment manufacturers is acceptable.
5.3.2 All the components of the transfer system through which LNG or natural gas flow shall be
rated for the maximum transfer system design pressure but shall have a pressure rating of no less than
1 034 MPa. All presentation flanges shall be at least Class 150 in accordance with ASME B16.5 and of
the weld-neck type.
5.3.3 All the components of the transfer system shall be fabricated to meet or exceed the applicable
sections of the standards indicated in Table 1, as well as the IGC/IGF Codes, in addition to other
requirements listed in this document.
Table 1 — Standards containing requirements applicable to transfer system components
Component Function Standard(s)
Hoses Transfer of LNG and natural gas EN 1474-2 or EN 12434 or
BS 4089
Swivel joints Product line articulation ISO 16904
Flanges Product line connections ASME B16.5
Bearings Articulation of support structure ISO 16904
ERS Emergency disconnect ISO 16904
Breakaway coupling Emergency disconnect ISO 16904
Transfer arms LNG bunkering loading solution ISO 16904
Other transfer system LNG bunkering loading solution ISO 16904
5.3.4 Flow rate of LNG through the transfer system shall not exceed 12 m/s, however, higher speeds
can be locally acceptable in reduced passages, for example in the ERS, provided cavitation and vibration
is acceptable.
5.4 Emergency shutdown and release systems
5.4.1 The LNG transfer system shall be fitted with an emergency release system (ERS) and connected
to an emergency shutdown system (ESD). The delivery facility and receiving vessel ESD systems shall
be interconnected with a ship/shore or ship/ship ESD link to ensure the coordinated operation of both
the delivery and receiving ESD systems and ERS.
5.4.1.1 The ERS shall be designed to protect the transfer system and the connections by disconnecting
the transfer system, primarily should the vessel drift out of its operating envelope. The ERS shall consist
ISO 20519:2021(E)
of an emergency release coupling (ERC) including interlocked isolating valves to minimize loss of LNG
or NG when the ERC is activated.
5.4.1.2 The ESD shall be designed to be activated by operator-initiated signals as well as sensor input
and, when activated, initiate shutting down the LNG transfer pumps and closing of the ESD valves. At a
minimum, they shall include sensors that provide input in the event of:
— fire or gas detection;
— power failure;
— LNG tanks being overfilled;
— abnormal pressure in the transfer system;
— vessel drifting out of position;
— low temperature in the drip tray;
— loading arm being overstressed.
NOTE An illustration of the ESD initiators is provided in Figures C.3 and C.4.
5.4.2 The ESD link shall be designed to conform to the requirements specified in Appendix D or H of
the ESD Arrangements & Linked Ship/Shore Systems for Liquefied Gas Carriers (SIGTTO).
5.4.3 The emergency release system (ERS) shall be designed to operate as a dry break system and
shall conform to the following requirements.
— Be designed to separate before the hose or loading arm is overstressed. This calculated force or
bending moment shall be documented. The system shall be capable of actuation both automatically
on vessel drift or manually from a remote location.
— Be designed to operate with ESD I and ESD II stage systems.
— Be designed to maintain integrity without leakage following ESD II while LNG is being transferred at
maximum flow (for example, for ESD II, "may" and "should" were replaced with "shall" throughout
the document when they were part of a requirement without ESD I).
— The consequences of an emergency breakaway in terms of resultant surge pressures shall be
determined and demonstrated to be within the capability of the supply system to not exceed the
design pressure.
— Be designed so that ice that forms during or after transfer does not impede the function of the
dry-disconnect/connect coupling or its emergency release collar when used in accordance with the
manufacturer’s directions.
5.4.4 The design for the ERS shall consider drifting scenarios commensurate with the surrounding
environment and location. A study shall be undertaken to simulate and determine the acceleration and
velocity of drift likely to occur due to a possible failure of the mooring system, taking into consideration
the range of vessels that are likely to use the terminal. The study shall consider, at a minimum, the
following:
— wind speeds and direction;
— current and bank effect;
— tidal range;
— waves and swell height, period and direction;
ISO 20519:2021(E)
— surge from passing vessels;
— inadvertent operation of vessel’s propulsion or of mooring system;
— ice flows.
5.4.5 Low volume transfer systems in which the LNG transfer rate does not exceed 150 m /h (for
example tank trucks) may, subject to performance of a transfer system design analysis, eliminate the
requirements for:
— manual activation of the ERS (5.4.3, list item 1);
— ERS to be designed to activate the emergency shutdown (5.4.3, list item 2);
— ESD link system complying with Appendix H of ESD Arrangements & Linked Ship/Shore Systems for
Liquefied Gas Carriers.
A system complying with Appendix D of ESD Arrangements & Linked Ship/Shore Systems for Liquefied
Gas Carriers is still required.
5.4.6 Prevention of over pressurization: Design of the transfer system shall consider over
pressurization due to surge pressure in the event the ERS or the ESD is activated. If procedures are
developed, they shall be documented in the bunkering operations procedures manual required in 6.5.
5.5 Specific requirements
5.5.1 System support
All transfer equipment shall be adequately supported during transfer operations to perform safely
under the operating parameters also listed in 5.6. Determination of the support required can be
obtained from two sources.
a) Documentation from the equipment manufacturers that lists the additional support (if any) needed
for the system to operate under the parameters listed in 5.6.
b) Documentation of an analysis conducted by a competent organization or individual, such as a
qualified engineer, of the forces involved under the operating parameters listed in 5.6 that identifies
what additional support (if any) is needed for the system to operate without exceeding the load
(tension, compressive, axial) or bending limits established by the equipment manufacturers.
5.5.2 Hoses, corrugated metallic or composite
5.5.2.1 General
Hoses used as part of the transfer system shall be designed for LNG use and meet one of the hose
standards listed in Table 1. The maximum load (stress), calculated by the manufacturer, that the hose
can be placed under prior to its failure (parting) shall be documented.
5.5.2.2 Hose support loading arm and hose supports (saddles)
If used, hose support loading arms and hose supports shall conform to ISO 16904 or EN 1474-3 and
be designed to safely support the loads (static and dynamic) imposed by the LNG transfer operations
during hose connection, transfer operations and when the hose is disconnected under emergency
conditions. They shall provide the necessary support so that the hose bending radius is not below
recommended minimum bending radius specified by the hose manufacturer.
The minimum and maximum hose lengths and diameters the hose support loading arm and/or hose
saddles can support shall be documented in the LNG bunkering procedures manual.
ISO 20519:2021(E)
5.5.3 Transfer arms
Transfer arms shall at a minimum conform to the requirements of ISO 16904 or EN 1474-3 or the Design
and Construction Specification for Marine Loading Arms.
5.5.4 Bunkering connections
Bunkering connections shall all be arranged in order to allow dry-disconnect operation, and shall be:
— dry-disconnect/connect coupling compliant with 5.5.5;
— manual connect coupler (without check valves) with receiving manifold standardized presentation
flange combined with operating procedures so that dry disconnection can be achieved;
— hydraulic coupler on standardized flange (without check valves) with receiving manifold
standardized presentation flange combined with operating procedures so that dry disconnection
can be achieved;
— flange bolting assembly with receiving manifold standardized presentation flange combined with
operating procedures so that dry-disconnection can be achieved;
— except in the case of an emergency release, drained and inerted before being disconnected.
5.5.5 Dry-disconnect/connect coupling
A dry-disconnect/connect coupling (DD/CC) consists of a nozzle and a receptacle. The nozzle allows
dry connection and disconnection of the fuel supply hose to the receptacle mounted on the LNG hose or
transfer arm of the transfer system. Connectors used shall be designed to operate as DD/CC and shall
conform to A, B or C as follows.
A: Meeting ISO 21593.
B: Meeting the requirements of ISO 21593, however, in lieu of the endurance test specified in 8.16 of
ISO 21593:2019, an alternative testing protocol may be used if:
— the alternative testing protocol provides the same level of confidence as would be gained from the
specified test;
— the alternative testing protocol and results are approved by a qualified third-party recognized
organization or independent certification body, including, but not limited to, a Classification Society.
C: DD/CCs that were produced prior to the publication of ISO 21593:2019 (July 2019) may be used,
provided those coupling meet the following requirements.
— Both the nozzle and the receptacle shall have an internal valve that are operated by each other. The
volume between the two valves shall be as small as possible to prevent the loss of LNG during the
disconnection process.
— Connection and disconnection shall be made with positive indication that connection is fully made.
An interlock shall be included to ensure coupl
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...