SIST EN ISO 21593:2020

Ship and marine technology - Technical requirements for dry-disconnect/connect couplings for bunkering liquefied natural gas (ISO 21593:2019)

This technical standard specifies the design, minimum safety, functional and marking requirements, as well as the interface types and dimensions and testing procedures for dry-disconnect/connect couplings for LNG hose bunkering systems intended for use on LNG bunkering ships, tank trucks and shore-based facilities and other bunkering infrastructures. It is not applicable to hydraulically operated quick connect/disconnect couplers (QCDC) used for hard loading arms, which is covered in ISO 16904. Based on the technology used in industrial manufacturing at the time of development of this document, it is applicable to sizes of couplings ranging from DN 25 to DN 200.

Schiff- und Meerestechnik- Trockene Anschluss- und Trennkupplung(en) für das Bunkern flüssigerdgasbetriebener Schiffe (ISO 21593:2019)

Dieses Dokument legt Anforderungen für Konstruktion, minimale Sicherheit, für Funktion und Kennzeichnung, sowie Schnittstellentypen und Maße und Prüfverfahren für LNG Trockenkupplungen fest, die LNG Schlauchbunkersystemen dienen und für LNG Bunkerschiffe, Tanklastwagen und land-basierte Anlagen und andere Bunkerinfrastrukturen bestimmt sind. Es ist nicht anwendbar auf hydraulisch betätigte Schnellkupplungen (QCDC, en: Quick Connect/Disconnect Coupler), die für feste Verladearme Verwendung finden und in ISO 16904 abgedeckt sind.
Basierend auf der Technologie, die zum Zeitpunkt der Erstellung dieses Dokuments in der industriellen Fertigung verwendet wurde, ist es für Kupplungsgrößen von DN 25 bis DN 200 anwendbar.

Navires et technologie maritime - Exigences techniques relatives au couplage de connexion et de déconnexion à sec pour le soutage de gaz naturel liquéfié (ISO 21593:2019)

Ce document spécifie les exigences de conception, de sécurité minimale, de fonctionnement et de marquage, ainsi que les types et dimensions d'interface et les procédures d'essai applicables au couplage de connexion/déconnexion à sec de GNL utilisé pour un système de soutage de GNL par flexible, destiné à être utilisé sur un navire de soutage de GNL, un camion-citerne, une installation terrestre et les autres infrastructures de soutage. Il ne s'applique pas aux coupleurs de connexion et de déconnexion rapide à commande hydraulique (QCDC) utilisés pour un bras de chargement rigide, lesquels sont couverts par l'ISO 16904.
Compte tenu de la technologie actuelle de production industrielle au moment de l'élaboration de ce document, il est applicable aux tailles de coupleurs comprise entre DN25 et DN200.

Ladijska in pristaniška tehnologija - Tehnične zahteve za suhe spoje za priklop in odklop pri polnjenju plovil na utekočinjeni zemeljski plin (ISO 21593:2019)

Ta tehnični standard določa zahteve glede projektiranja, minimalne varnosti, delovanja in označevanja ter tudi vrste vmesnikov in mere ter preskusne postopke za suhe spoje za priklop in odklop pri cevnih sistemih za polnjenje utekočinjenega zemeljskega plina (LNG), namenjenih za uporabo na plovilih na utekočinjeni zemeljski plin, tovornjakih s cisternami ter priobalnih sistemih in drugih infrastrukturah za polnjenje. Ne uporablja se za hidravlično upravljane hitre spojke (QCDC), ki se uporabljajo za trdne prenosne roke, obravnavane v standardu ISO 16904. Na podlagi tehnologije, uporabljane pri industrijski proizvodnji v času priprave tega dokumenta, se uporablja za vse velikosti spojk od DN 25 do DN 200.

General Information

• Status: Published
• Public Enquiry End Date: 04-Dec-2018
• Publication Date: 02-Dec-2019
• ICS: 47.020.99 - Other standards related to shipbuilding and marine structures
• Technical Committee: DPL - Gas supply
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Oct-2019
• Due Date: 14-Dec-2019
• Completion Date: 03-Dec-2019
• Directive: 2014/94/EU - Directive 2014/94/EU of The European Parliament and of The Council of 22 October 2014 on the deployment of alternative fuels infrastructure
• Mandate: M/533 - [C(2015)1330] Standardisation request addressed to CEN, CENELEC and ETSI in support of the implementation of the Directive 2014/94/EU on the deployment of alternative fuels infrastructure
• Ref Project: EN ISO 21593:2019 - Ship and marine technology - Technical requirements for dry-disconnect/connect couplings for bunkering liquefied natural gas (ISO 21593:2019)

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 21593:2020
01-januar-2020

Ladijska in pristaniška tehnologija - Tehnične zahteve za suhe spoje za priklop in

odklop pri polnjenju plovil na utekočinjeni zemeljski plin (ISO 21593:2019)
Ship and marine technology - Technical requirements for dry-disconnect/connect
couplings for bunkering liquefied natural gas (ISO 21593:2019)
Schiff- und Meerestechnik- Trockene Anschluss- und Trennkupplung(en) für das
Bunkern flüssigerdgasbetriebener Schiffe (ISO 21593:2019)
Navires et technologie maritime - Exigences techniques relatives au couplage de
connexion et de déconnexion à sec pour le soutage de gaz naturel liquéfié (ISO
21593:2019)
Ta slovenski standard je istoveten z: EN ISO 21593:2019
ICS:
47.020.99 Drugi standardi v zvezi z Other standards related to
ladjedelništvom in shipbuilding and marine
konstrukcijami na morju structures
SIST EN ISO 21593:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 21593:2020
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SIST EN ISO 21593:2020
EN ISO 21593
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2019
EUROPÄISCHE NORM
ICS 47.020.99
English Version
Ship and marine technology - Technical requirements for
dry-disconnect/connect couplings for bunkering liquefied
natural gas (ISO 21593:2019)

Navires et technologie maritime - Exigences techniques Schiff- und Meerestechnik- Trockene Anschluss- und

relatives au couplage de connexion et de déconnexion à Trennkupplung(en) für das Bunkern

sec pour le soutage de gaz naturel liquéfié (ISO flüssigerdgasbetriebener Schiffe (ISO 21593:2019)

21593:2019)
This European Standard was approved by CEN on 19 January 2019.

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21593:2019 E

worldwide for CEN national Members.
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SIST EN ISO 21593:2020
EN ISO 21593:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 21593:2020
EN ISO 21593:2019 (E)
European foreword

This document (EN ISO 21593:2019) 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 March 2020, and conflicting national standards shall

be withdrawn at the latest by March 2020.

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 has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

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 21593:2019 has been approved by CEN as EN ISO 21593:2019 without any modification.

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SIST EN ISO 21593:2020
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SIST EN ISO 21593:2020
INTERNATIONAL ISO
STANDARD 21593
First edition
2019-07
Ships and marine technology —
Technical requirements for dry-
disconnect/connect couplings for
bunkering liquefied natural gas
Navires et technologie maritime — Exigences techniques relatives au
couplage de connexion et de déconnexion à sec pour le soutage de gaz
naturel liquéfié
Reference number
ISO 21593:2019(E)
ISO 2019
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SIST EN ISO 21593:2020
ISO 21593:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 21593:2020
ISO 21593:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General requirements ..................................................................................................................................................................................... 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Basic design principle ....................................................................................................................................................................... 3

4.3 Design parameters ............................................................................................................................................................................... 4

4.4 Functional requirements ................................................................................................................................................................ 5

4.5 Internal valve ............................................................................................................................................................................................ 5

4.6 Protective cap/plug ............................................................................................................................................................................. 6

4.7 Handle............................................................................................................................................................................................................. 6

5 Materials ....................................................................................................................................................................................................................... 6

5.1 General ........................................................................................................................................................................................................... 6

5.2 Body of coupling .................................................................................................................................................................................... 6

5.3 Bolting ............................................................................................................................................................................................................ 6

5.4 Spring .............................................................................................................................................................................................................. 6

5.5 Seals .................................................................................................................................................................................................................. 6

5.6 Welding .......................................................................................................................................................................................................... 6

6 Interface types and dimensions ........................................................................................................................................................... 6

7 Marking .......................................................................................................................................................................................................................... 9

8 Testing ............................................................................................................................................................................................................................. 9

8.1 General ........................................................................................................................................................................................................... 9

8.2 Ambient test conditions ...............................................................................................................................................................10

8.3 Cryogenic test conditions ...........................................................................................................................................................10

8.4 Test arrangement ...............................................................................................................................................................................11

8.5 Shell tightness at ambient temperature .........................................................................................................................12

8.6 Shell strength at ambient temperature ...........................................................................................................................12

8.7 Internal valve tightness at ambient temperature ..................................................................................................12

8.8 Internal valve strength at ambient temperature ....................................................................................................13

8.9 Shell tightness at minimum working temperature ...............................................................................................13

8.10 Internal valve tightness at minimum working temperature ........................................................................13

8.11 Operation test at minimum working temperature ...............................................................................................14

8.12 Electrical conductivity ...................................................................................................................................................................14

8.13 Manual force at cold conditions under frost ..............................................................................................................14

8.14 Bending test ............................................................................................................................................................................................14

8.15 Drop test ....................................................................................................................................................................................................15

8.16 Endurance test .....................................................................................................................................................................................15

8.17 High-pressure test .............................................................................................................................................................................16

Bibliography .............................................................................................................................................................................................................................17

© ISO 2019 – All rights reserved iii
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SIST EN ISO 21593:2020
ISO 21593:2019(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.

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 2019 – All rights reserved
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SIST EN ISO 21593:2020
INTERNATIONAL STANDARD ISO 21593:2019(E)
Ships and marine technology — Technical requirements
for dry-disconnect/connect couplings for bunkering
liquefied natural gas
1 Scope

This document specifies the design, minimum safety, functional and marking requirements, as well as

the interface types and dimensions and testing procedures for dry-disconnect/connect couplings for

LNG hose bunkering systems intended for use on LNG bunkering ships, tank trucks and shore-based

facilities and other bunkering infrastructures. It is not applicable to hydraulically operated quick

connect/disconnect couplers (QCDC) used for hard loading arms, which is covered in ISO 16904.

Based on the technology used in industrial manufacturing at the time of development of this document,

it is applicable to sizes of couplings ranging from DN 25 to DN 200.
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 amendment) applies.

ISO 3834 (all parts), Quality requirements for fusion welding of metallic materials

ISO 5208:2015, Industrial valves — Pressure testing of metallic valves
EN 1092-1, Flanges and their joints

EN 12266-1:2012, Industrial valves — Testing of metallic valves — Part 1: Pressure tests, test procedures

and acceptance criteria — Mandatory requirements
ASME B16.5-2009, Pipe flanges and flanged fittings
ASME B31.3-2018, Process piping
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
bunkering
operation of transferring LNG fuel to a vessel
[SOURCE: ISO 20519:2017, 3.1, modified — Note 1 to entry has been deleted.]
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SIST EN ISO 21593:2020
ISO 21593:2019(E)
3.2
dry-disconnect

method that reduces LNG or natural gas releases into the atmosphere under normal operation to a

negligible amount consistent with safety, either by equipment design or procedural practice

[SOURCE: ISO 20519:2017, 3.6]
3.3
dry-disconnect/connect coupling
coupling
dry disconnect coupling
dry break coupling

mechanical device, consisting of a nozzle (3.4) and a receptacle (3.5), which permits quick connection

and disconnection of a hose bunkering system of the bunker facility to the manifold of the receiving

vessel, in a safe manner, without employing bolts
3.4
nozzle

half part of the dry-disconnect/connect coupling (3.3) typically mounted on the hose bunkering system

of the bunker facility, which permits a quick connection and disconnection to the receiving vessel in a

safe manner

Note 1 to entry: It includes an internal valve to seal the nozzle/bunkering system when disconnected and is

opened after connection by manual operation.
Note 2 to entry: See 4.2.4.
3.5
receptacle

half part of the dry-disconnect/connect coupling (3.3), which is typically mounted to the manifold flange

of the receiving vessel, which permits a quick connection and disconnection of the hose bunkering

system in a safe manner

Note 1 to entry: It includes an internal valve to seal the receptacle/manifold (3.7) system when disconnected and

is opened after connection by manual operation of the nozzle (3.4).

Note 2 to entry: The receptacle shall always be equipped with a seal, as shown in Figure 3.

Note 3 to entry: See 4.2.4.
3.6
dry gas

gas with moisture content such that the dew point of the gas at the required test pressure is at least

11 °C below the ambient test temperature
3.7
manifold

pipe assembly mounted on board LNG-fuelled vessel to which the flange of the receptacle (3.5) is

connected
3.8
verification testing

series of tests to assure that each coupling (3.3) part (including nozzle (3.4) and receptacle (3.5)) meets

all of its design specifications and requirements and that it fulfils its intended purposes

3.9
production testing

process of measuring the properties or performance of the coupling (3.3) and checking it and obtaining

an indication of well productivity before being delivered from factory to customer

2 © ISO 2019 – All rights reserved
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SIST EN ISO 21593:2020
ISO 21593:2019(E)
4 General requirements
4.1 General

The dry-disconnect/connect coupling shall be functionally compatible with the LNG bunkering system;

the nozzle shall be functionally compatible with the corresponding receptacles, and vice versa.

4.2 Basic design principle

4.2.1 The coupling consists of a nozzle and a receptacle. The nozzle allows a quick connection and

disconnection of the LNG bunkering system to the receptacle.

4.2.2 The poppet faces of the internal valve from the nozzle interacts and pushes the receptacle poppet

toward the open position in order to allow a medium flow.

4.2.3 The nozzle and receptacle shall remain in the final position when the coupling is connected and

is in fully open condition.

4.2.4 The typical structure of the two-part coupling is shown in Figure 1 and Figure 2:

Key
1 internal valve
2 poppet
3 flange
4 manifold of LNG receiving vessel
5 receptacle
6 nozzle
7 hose of LNG bunkering facility
8 handle

Figure 1 — Sketch structure of a dry-disconnect/connect coupling — Disconnected condition

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SIST EN ISO 21593:2020
ISO 21593:2019(E)
Key
1 internal valve
2 poppet
3 flange
4 manifold of LNG receiving vessel
5 receptacle
6 nozzle
7 hose of LNG bunkering facility
8 handle
9 coupling

Figure 2 — Sketch structure of a dry-disconnect/connect coupling — Connected condition

4.2.5 The dry disconnect/connect coupling shall be designed according to a design standard for

pressure-containing equipment. Accepted design codes are:
— ASTM Boiler and Pressure Vessel Code;
— European Pressure Equipment Directive 2014/68/EU;
— EN 12516 Industrial Valves – Shell design strength;

— ISO 16904:2016, 7.2 Design of QCDC; Section 7.3 QCDC system; 9.3.8 QCDC (Testing requirements).

Other design codes can be accepted if they provide the same level of safety with respect to pressure

containment.

The wall thickness of the coupling shall take into account, as a minimum but not limited to, the internal

pressure, the external loads and the moments.
4.2.6 The receptacle shall always be equipped with a seal, as shown in Figure 3.
4.3 Design parameters

The design pressure and temperature of the dry-disconnect/connect coupling shall comply with:

a) Minimum design pressure:
1,6 MPa.
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SIST EN ISO 21593:2020
ISO 21593:2019(E)
b) Design temperature:
−196 °C to + 85 °C.
4.4 Functional requirements

4.4.1 An interlock function shall be included to ensure the coupling is sealed first under connection,

before the internal valves are opened. When disconnecting, the internal valves shall be closed first, before

it is possible to disconnect the coupling. This may be achieved by an internal interlock device (two-step

action) or sequential in one single rotating manoeuvre (single-step action).

4.4.2 The volume between the two internal valves shall be as small as practical and reported by the

manufacturer.

4.4.3 Once connected, the coupling shall remain liquid and gas tight under all operating conditions,

and shall sustain:

1. The external loads applied at the connection between the bunkering system and the ship’s manifold

(dynamic and static as well as ice accretion).

2. The internal loads due to the LNG transfer process, either pressure or thermal loads during

transient and permanent phases.
The bending loads shall comply with the value specified in Table 5.

4.4.4 It shall be possible to disconnect the nozzle from the receptacle under the maximum manifold

loads, including an ice build-up on the device with a thickness of:
1. for DN 25 to DN 80: 10 mm solid ice (d = 800 kg/m );
2. for DN 100 to DN 200: 25 mm solid ice (d = 800 kg/m ).

4.4.5 The design of the coupling shall allow the coupling to be manually connected and disconnected

unaided and the maximum force to (dis)connect the nozzle from the receptacle shall not exceed 350 N.

Where this force exceeds 350 N, actuation shall be pneumatically or hydraulically assisted.

The nozzle shall be so designed as to be operated without the use of tools (e.g. extension bars) and

excessive force for connecting and disconnecting.

4.4.6 The operation direction to open and close shall be indicated with an indelible mark. Connected

condition shall be made with a positive indication that the mechanism action is fully made.

4.4.7 The design of the nozzle and receptacle shall allow for the removal of liquid and vapour before

disconnection, avoiding vapour and liquid trapped in the dead space during purging operation.

4.4.8 The nozzle shall have an integrated swivel function. It shall allow free rotation, to prevent the

application of torsional loads on the bunkering system.

4.4.9 The coupling shall have suitable fire resistance properties and shall be fire type tested in

accordance with recognized standards (e.g. ISO 10497).
4.4.10 The coupling shall be made of conductive, non-sparking material.
4.5 Internal valve

The backwards force of the receptacle poppet in fully open position shall be maximum of 460 N.

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SIST EN ISO 21593:2020
ISO 21593:2019(E)
4.6 Protective cap/plug

A cap/plug or equivalent design feature shall be provided to prevent dust, moisture, and other foreign

debris from entering the nozzle and receptacle. The cap/plug shall not allow the build-up of pressure

between the receptacle and the cap as well as between the nozzle and the plug.
4.7 Handle

A handle is to be fitted to the nozzle to protect the operator from cold injuries.

5 Materials
5.1 General

The material shall be suitable for the use with LNG and for the test conditions with liquid nitrogen

down to −196 °C. Recommendations are mentioned in ISO 16903:2015, Table 3.
5.2 Body of coupling

5.2.1 The coupling shall be made from forged stainless steel ASTM A182 grade F316 or equivalent, in

the solution heat-treated condition.

5.2.2 The coupling may be manufactured from bar material according to ASTM A479, EN 10272 or

equivalent, in a solution heat-treated condition.
5.3 Bolting
Bolting shall be in accordance with ASME/ANSI B16.5 or EN 1092-1.
5.4 Spring

Any springs used within the receptacle or nozzle shall be suitable for the design pressure and

temperature specified in 4.3, and shall be suitable against fatigue for 10 000 cycles that is the same as

the endurance test of 8.16.
5.5 Seals

Seals shall be suitable for the design pressure and temperature specified in 4.3.

5.6 Welding

Welds to stainless steel grade 316 (L) shall be made using welding procedures qualified by impact testing

at –196 °C in accordance with the requirements of ASME B31.3-2018, 323.2.2 or ISO 3834 (all parts) or

equivalent. Material certificates of these welded fittings shall refer to these WPQs.

6 Interface types and dimensions

6.1 The end termination of the receptacle connecting to the manifold system shall be flanged in

accordance with 6.3.

6.2 The end termination of the nozzle connecting to the LNG hose bunkering system shall be flanged

but may be screwed by NPT or JIC below DN 150 in accordance with ASME 1.20.1 or SAE J514.

6 © ISO 2019 – All rights reserved
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SIST EN ISO 21593:2020
ISO 21593:2019(E)

6.3 The flange shall have a raised face ‘RF’ in accordance with ASME/ANSI B16.5 or EN 1092-1, forged

integral with the body, or attached by qualified full penetration butt-welding or inertia welding, followed

by heat treatment as required by the material specification.

6.4 The receptacle shall comply with the dimensions as shown in Figure 3 and Table 1.

Dimension in millimetres
Figure 3 — Interface type and dimensions of the receptacle
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SIST EN ISO 21593:2020
ISO 21593:2019(E)
8 © ISO 2019 – All rights reserved
Table 1 — Dimensions in millimeters

DN 25 min max DN 50 min max DN 65 min max DN 80 min max DN 100 min max DN 150 min max DN 200 min max

A1 13 −0,1 0 14 −0,1 0 14 −0,1 0 15 −0,1 0 18 −0,1 0 30 −0,1 0 40 −0,1 0
A2 11 −0,1 0 11 −0,1 0 11 −0,1 0 12 −0,1 0 14 −0,1 0 25 −0,1 0 28 −0,1 0
A3 29 0 0,05 43 0 0,05 59 0 0,05 78 0 0,05 87 0 0,05 140 0 0,1 192 0 0,1
A4 48 0 0,05 62 0 0,05 78 0
...