oSIST prEN 1918-3:2025
(Main)Gas infrastructure - Underground gas storage - Part 3: Functional recommendations for storage in solution-mined salt caverns
Gas infrastructure - Underground gas storage - Part 3: Functional recommendations for storage in solution-mined salt caverns
This document covers the functional recommendations for design, construction, testing, commissioning, operation, maintenance and abandonment of underground gas storage (UGS) facilities in solution-mined salt caverns up to and including the wellhead.
It specifies practices which are safe and environmentally acceptable.
For necessary surface facilities for underground gas storage, EN 1918 5 applies.
In this context “gas” refers to flammable gas:
— which is in a gaseous state at a temperature of 15 °C and under a pressure of 0,1 MPa (the stored product is also named fluid);
— which meets specific quality requirements in order to maintain underground storage integrity, performance, environmental compatibility and fulfils contractual requirements.
This comprises:
— gas not in liquid phase under subsurface conditions;
— methane-rich gases;
— natural gas;
— biomethane;
— synthetic methane;
— hydrogen of various purities;
— any mixtures of the gases above;
— hydrocarbon gas in liquid phase under subsurface conditions such as;
— ethylene;
— liquified petroleum gas (LPG).
NOTE 1 Correspondingly the EN 1918 series can be considered where applicable for underground storage of any other fluid e.g. helium, carbon dioxide, compressed air, rDME (renewable dimethyl ether) and hydrogen transport fluids (such as ammonia and LOHC).
This document is not intended to be applied retrospectively to existing facilities.
NOTE 2 Correspondingly this document can be considered for major conversions in case of significant change of gas composition.
Gasinfrastruktur - Untertagespeicherung von Gas - Teil 3: Funktionale Empfehlungen für die Speicherung in gesolten Salzkavernen
Infrastructure gazières - Stockage souterrain de gaz - Partie 3 : Recommandations fonctionnelles pour le stockage en cavités salines creusées par dissolution
Le présent document décrit les recommandations fonctionnelles pour la conception, la construction, les essais, la mise en service, l’exploitation, la maintenance et l’abandon des stockages souterrains de gaz en cavités salines creusées par dissolution jusqu’à la tête de puits incluse.
Il spécifie les pratiques acceptables pour la sécurité et l’environnement.
Pour les installations de surface nécessaires pour le stockage souterrain de gaz, l’EN 1918 5 s’applique.
Dans ce contexte, le terme « gaz » désigne un gaz inflammable :
— qui est à l’état gazeux à une température de 15 °C et sous une pression de 0,1 MPa (le produit stocké est également appelé « fluide ») ;
— qui satisfait à des prescriptions spécifiques en matière de qualité afin de maintenir l’intégrité, les performances, la compatibilité environnementale du stockage souterrain et qui respecte les prescriptions contractuelles.
Sont inclus :
— les gaz qui ne sont pas en phase liquide dans des conditions de subsurface :
— les gaz riches en méthane :
— le gaz naturel ;
— le biométhane ;
— le méthane de synthèse ;
— l’hydrogène de différentes puretés ;
— tout mélange des gaz précités ;
— les gaz d’hydrocarbure en phase liquide dans des conditions de subsurface, tels que :
— l’éthylène ;
— les gaz de pétrole liquéfiés (GPL).
NOTE 1 Par conséquent, une utilisation de la série EN 1918 peut être envisagée, lorsque cela est applicable, pour le stockage souterrain de tout autre fluide tel que l’hélium, le dioxyde de carbone, l’air comprimé, le diméthyl éther renouvelable (rDME) et les fluides de transport de l’hydrogène (ammoniac et LOHC, par exemple).
Le présent document n’est pas destiné à être appliqué de façon rétroactive aux installations existantes.
NOTE 2 Par conséquent, le présent document peut être utilisé pour des conversions majeures en cas de changement significatif de la composition du gaz.
Infrastruktura za plin - Podzemna plinska skladišča - 3. del: Funkcionalna priporočila za skladiščenje v solnih kavernah
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
Infrastruktura za plin - Podzemna plinska skladišča - 3. del: Funkcionalna
priporočila za skladiščenje v solnih kavernah
Gas infrastructure - Underground gas storage - Part 3: Functional recommendations for
storage in solution-mined salt caverns
Gasinfrastruktur - Untertagespeicherung von Gas - Teil 3: Funktionale Empfehlungen für
die Speicherung in gesolten Salzkavernen
Infrastructure gazières - Stockage souterrain de gaz - Partie 3 : Recommandations
fonctionnelles pour le stockage en cavités salines creusées par dissolution
Ta slovenski standard je istoveten z: prEN 1918-3
ICS:
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.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2025
ICS 75.200 Will supersede EN 1918-3:2016
English Version
Gas infrastructure - Underground gas storage - Part 3:
Functional recommendations for storage in solution-
mined salt caverns
Infrastructure gazières - Stockage souterrain de gaz - Gasinfrastruktur - Untertagespeicherung von Gas - Teil
Partie 3 : Recommandations fonctionnelles pour le 3: Funktionale Empfehlungen für die Speicherung in
stockage en cavités salines creusées par dissolution gesolten Salzkavernen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 234.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1918-3:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Terms and definitions common to EN 1918 (all parts) . 7
3.2 Terms and definitions specific to this document . 11
4 Requirements for underground gas storage . 13
4.1 General . 13
4.2 Underground gas storage . 13
4.2.1 Overview and functionality . 13
4.2.2 Types . 14
4.2.3 General characterization . 15
4.2.4 Storage in salt caverns. 15
4.3 Long-term containment of stored fluids . 17
4.4 Environmental conservation . 17
4.4.1 General . 17
4.4.2 Methane emissions . 18
4.4.3 Other gas emissions . 19
4.5 Safety . 19
4.6 Monitoring . 19
5 Design . 20
5.1 Design principles . 20
5.2 Geological exploration . 20
5.3 Caverns . 21
5.4 Wells . 23
5.4.1 General . 23
5.4.2 Location . 23
5.4.3 Casings . 24
5.4.4 Completions . 24
5.5 Monitoring systems . 28
5.6 Neighbouring subsurface activities . 28
5.7 Solution mining . 28
5.7.1 General . 28
5.7.2 Brine discharge . 30
6 Construction . 30
6.1 General . 30
6.2 Wells . 30
6.3 Completions . 31
6.4 Solution mining . 31
6.4.1 General . 31
6.4.2 Leaching wellheads . 32
6.4.3 Cavern volume calculation . 32
6.5 Wellheads . 33
6.6 First gas fill . 33
6.6.1 General . 33
6.6.2 Monitoring the first gas fill . 34
6.7 Recompletion after the first gas fill . 34
6.8 First gas filling (gas in liquid phase) . 34
7 Testing and commissioning . 34
8 Operation, monitoring and maintenance . 35
8.1 Operating principles . 35
8.2 Cavern monitoring and maintenance . 35
8.3 Injection and withdrawal operations . 36
8.4 Maintenance of wells . 36
8.5 Health, safety and environment . 36
8.5.1 Safety management and health and environment . 36
8.5.2 Emergency procedures . 37
8.6 Adaptation to climate change . 37
8.6.1 Climate change effects . 37
8.6.2 Climate change impacts . 38
9 Abandonment. 39
9.1 General . 39
9.2 Withdrawal of the gas and pressure monitoring . 39
9.3 Plugging and abandonment of wells . 40
9.4 Surface facilities . 40
Annex A (informative) Significant technical changes between this document and
EN 1918-3:2016 . 41
Bibliography . 42
European foreword
This document (prEN 1918-3:2025) has been prepared by Technical Committee CEN/TC 234 “Gas
infrastructure”, t
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