EN 17921:2024
(Main)Natural gas fuelling stations - LNG unloading connector
Natural gas fuelling stations - LNG unloading connector
This document specifies a harmonized unloading connector for LNG road tanker at LNG fuelling stations. This document is also applicable to LNG RID applications. While LNG is also transported by rail, European regulations are organized through the International Carriage of Dangerous Goods by Rail (RID). The same configuration as defined by this document, can be utilized. This document includes requirements for (at least):
- functional description of the LNG unloading receptacle and LNG unloading nozzle;
- technical layout description of the LNG unloading receptacle.
The technical layout description of the LNG unloading nozzle is not part of this document.
The basic functional requirement of the LNG unloading connector are as follows:
- to prevent leakage of methane during operation and in particular during disconnecting;
- easy handling, no spillage and purging with nitrogen during disconnecting.
The loading connector between the LNG road tanker and the LNG terminal is not covered by this document.
See Figure 1.
Gasfüllanlagen - LNG-Entladeanschluss
Dieses Dokument legt einen harmonisierten Entladeanschluss für LNG Tankwagen an LNG Füllanlagen fest. Dieses Dokument ist auch für LNG RID Anwendungen anwendbar. Während LNG auch mit der Bahn transportiert wird, sind die europäischen Vorschriften durch das Internationale Übereinkommen über die Beförderung gefährlicher Güter auf der Schiene (RID, en: International Carriage of Dangerous Goods by Rail) geregelt. Hierbei kann die gleiche Konfiguration, wie sie in diesem Dokument festgelegt ist, verwendet werden. Dieses Dokument enthält Anforderungen für (mindestens):
- die Funktionsbeschreibung des LNG Entladeempfängerstutzens und des LNG Entladestutzens;
- die Beschreibung der technischen Gestaltung des LNG Entladeempfängerstutzens.
Die Beschreibung der technischen Gestaltung des LNG Entladestutzens ist nicht Teil dieses Dokuments.
Die grundlegenden Funktionsanforderungen an den LNG Entladeanschluss sind wie folgt:
- Verhinderung der Leckage von Methan während des Betriebs und insbesondere beim Trennen der Verbindung;
- einfache Handhabung, kein Auslaufen und Spülen mit Stickstoff beim Trennen der Verbindung.
Der Ladeverbinder zwischen dem LNG Tankwagen und dem LNG Terminal wird in diesem Dokument nicht behandelt.
Siehe Bild 1.
Stations-service de gaz naturel - Connecteur de déchargement de GNL
Le présent document fournit la conception d'un connecteur de déchargement entre un camion-citerne GNL et les stations-service GNL. Ce document est également applicable aux applications RID GNL. Si le GNL est également transporté par voie ferroviaire, la réglementation européenne s'organise à travers le transport international des marchandises dangereuses par rail (RID). La même configuration que celle définie par ce document peut être utilisée. Le présent document inclut les exigences pour (au moins) :
— la description fonctionnelle de l'about de déchargement de GNL et du pistolet de déchargement de GNL ;
— la description de la disposition technique de l'about de déchargement de GNL.
La description de la disposition technique du pistolet de déchargement de GNL n'est pas incluse dans le présent document.
Les exigences fonctionnelles de base concernant le connecteur de déchargement de GNL sont les suivantes :
— empêcher la fuite de méthane pendant le fonctionnement, en particulier lors de la déconnexion ;
— manipulation facile, aucun déversement et purge à l'azote lors de la déconnexion.
Le connecteur de chargement entre le camion-citerne GNL et le terminal GNL n'est pas couvert par le présent document.
Voir Figure 1.
Légende
A domaine d’application de la norme
B hors du domaine d’application de la norme
C pistolet de déchargement de GNL au point de livraison
D about de déchargement de GNL au réservoir de réception
E flexible de déchargement raccordé à la citerne
F flexible de déchargement
Figure 1 — Domaine d'application du document
Polnilne postaje za oskrbo z utekočinjenim zemeljskim plinom - Priključki za raztovarjanje
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2024
Polnilne postaje za oskrbo z utekočinjenim zemeljskim plinom - Priključki za
raztovarjanje
Natural gas fuelling stations - LNG unloading connector
Gasfüllanlagen - LNG-Entladeanschluss
Stations-service de gaz naturel - Connecteur de déchargement de GNL
Ta slovenski standard je istoveten z: EN 17921:2024
ICS:
43.040.01 Sistemi za cestna vozila na Road vehicle systems in
splošno general
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17921
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 43.080.10; 75.200
English Version
Natural gas fuelling stations - LNG unloading connector
Stations-service de gaz naturel - Connecteur de Gasfüllanlagen - LNG-Entladeanschluss
déchargement de GNL
This European Standard was approved by CEN on 8 January 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17921:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 Functional requirements . 9
4.1 General requirement . 9
4.2 Functional description of the LNG unloading connector . 10
4.2.1 General. 10
4.2.2 Dry connector . 10
4.2.3 Protective cap . 10
4.2.4 Type of mounting . 10
4.2.5 Positive locking . 10
4.2.6 Safe disconnect . 10
4.2.7 (Internal) Check valve . 10
4.2.8 Venting and depressurization . 11
4.2.9 Electrical conductivity . 11
4.2.10 Spillage volume . 11
5 Technical description of LNG unloading connector . 11
5.1 Materials . 11
5.1.1 General. 11
5.1.2 LNG unloading connector . 11
5.1.3 Corrosion protection . 11
5.2 Pressure rating . 11
5.2.1 Maximum allowable working pressure (MAWP) . 11
5.2.2 Maximum working pressure . 11
5.2.3 Design cycle life; . 11
5.3 LNG unloading connector mounting . 12
5.4 LNG unloading connector working temperature range . 12
5.4.1 General. 12
5.4.2 Material of the bodies of the LNG unloading receptacle and of the LNG unloading nozzle
.......................................................................................................................................................................... 12
6 Design of the LNG unloading connector . 13
7 Tests requirements . 14
7.1 General requirements . 14
7.1.1 General. 14
7.1.2 Ambient test conditions . 14
7.1.3 Cryogenic test conditions . 15
7.2 Shell tightness at ambient temperature . 15
7.3 Shell strength at ambient temperature . 15
7.4 Seat tightness at ambient temperature . 15
7.5 Obturator strength at ambient temperature against atmosphere . 15
7.6 Shell tightness at minimum working temperature . 16
7.7 Seat tightness at minimum working temperature . 16
7.7.1 General. 16
7.7.2 Test arrangement for LNG unloading nozzle (Figure 3) . 16
7.7.3 Test arrangement for LNG unloading receptacle (Figure 4) . 17
7.8 Burst test . 17
7.9 Operation test at minimum working temperature . 17
7.10 Endurance test . 18
7.11 Bending test . 18
7.12 Drop test . 18
7.13 Tensile force . 19
7.13.1 Manual force in warm conditions . 19
7.13.2 Manual force at cold conditions under frost . 19
7.14 Corrosion resistance . 19
8 Safety requirements . 20
9 Maintenance . 20
Bibliography . 21
European foreword
This document (EN 17921:2024) has been prepared by Technical Committee CEN/TC 326 “Natural gas
vehicles - Fuelling and operation”, the secretariat of which is held by TSE.
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 September 2024, and conflicting national standards shall
be withdrawn at the latest by September 2024.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Türkiye and the United
Kingdom.
Introduction
The transport of LNG over the road in Europa is organized through ADR regulations. This European
Agreement concerning the International Carriage of Dangerous Goods by Road specifies the safety
procedures of the road tanker and driver. The design, construction, operation, maintenance and
inspection including equipment safety and control devices for LNG fuelling stations are described in
EN ISO 16924:2016 “Natural gas fuelling stations — LNG stations for fuelling vehicles”.
This document describes a harmonized unloading connector for LNG road tanker at LNG fuelling stations.
While LNG is also transported by rail, European regulations are organized through the International
Carriage of Dangerous Goods by Rail (RID). The same configuration as specified by this document, can be
utilized for LNG RID applications.
1 Scope
This document specifies a harmonized unloading connector for LNG road tanker at LNG fuelling stations.
This document is also applicable to LNG RID applications. While LNG is also transported by rail, European
regulations are organized through the International Carriage of Dangerous Goods by Rail (RID). The same
configuration as defined by this document, can be utilized. This document includes requirements for (at
least):
— functional description of the LNG unloading receptacle and LNG unloading nozzle;
— technical layout description of the LNG unloading receptacl
...
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