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prEN 1918-5

(Main)

Gas infrastructure - Underground gas storage - Part 5: Functional recommendations for surface facilities

Gas infrastructure - Underground gas storage - Part 5: Functional recommendations for surface facilities

This document covers the functional recommendations for the design, construction, testing, commissioning, operation, maintenance and abandonment of the surface facilities for underground gas storage (UGS), between the wellhead and the connection to the gas grid.
It specifies practices which are safe and environmentally acceptable.
For necessary subsurface facilities for underground storage, the relevant part of EN 1918-1 to EN 1918-4 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 5: Funktionale Empfehlungen für Übertageanlagen

Infrastructures gazières - Stockage de gaz souterrain - Partie 5 : Recommandations fonctionnelles pour les installations de surface

Infrastruktura za plin - Podzemna plinska skladišča - 5. del: Funkcionalna priporočila za nadzemno opremo

General Information

Status
Not Published
Publication Date
25-Aug-2026
ICS
75.200 - Petroleum products and natural gas handling equipment
Technical Committee
CEN/TC 234 - Gas infrastructure
Drafting Committee
CEN/TC 234/WG 4 - Gas underground storage
Current Stage
4010 - Start of draft translation - Enquiry
Start Date
27-Mar-2025
Completion Date
27-Mar-2025
Mandate
M/017 - Standardization mandate to CEN in the field of equipment and installation for the transmission and distribution of gas
Ref Project
oSIST prEN 1918-5:2025 - Gas infrastructure - Underground gas storage - Part 5: Functional recommendations for surface facilities

Relations

Revises
EN 1918-5:2016 - Gas infrastructure - Underground gas storage - Part 5: Functional recommendations for surface facilities
Effective Date
18-Jan-2023

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SLOVENSKI STANDARD
01-junij-2025
Infrastruktura za plin - Podzemna plinska skladišča - 5. del: Funkcionalna
priporočila za nadzemno opremo
Gas infrastructure - Underground gas storage - Part 5: Functional recommendations for
surface facilities
Gasinfrastruktur - Untertagespeicherung von Gas - Teil 5: Funktionale Empfehlungen für
Übertageanlagen
Infrastructures gazières - Stockage de gaz souterrain - Partie 5 : Recommandations
fonctionnelles pour les installations de surface
Ta slovenski standard je istoveten z: prEN 1918-5
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 1918-5:2016
English Version
Gas infrastructure - Underground gas storage - Part 5:
Functional recommendations for surface facilities
Infrastructures gazières - Stockage de gaz souterrain - Gasinfrastruktur - Untertagespeicherung von Gas - Teil
Partie 5 : Recommandations fonctionnelles pour les 5: Funktionale Empfehlungen für Übertageanlagen
installations de surface
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 1918-5:2025 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 . 9
4 Requirements for underground gas storage . 10
4.1 General. 10
4.2 Underground gas storage . 10
4.2.1 Overview and functionality . 10
4.2.2 Types . 11
4.2.3 General characterization . 12
4.3 Injection facilities . 13
4.3.1 Liquid and solid separation . 13
4.3.2 Gas compression . 13
4.3.3 Gas cooling . 14
4.4 Withdrawal facilities . 14
4.4.1 Prevention of hydrate formation . 14
4.4.2 Solid and liquid separation . 14
4.4.3 Gas heating . 14
4.4.4 Pressure reduction . 14
4.4.5 Gas conditioning . 14
4.4.6 Re-Compression . 14
4.4.7 Odorization . 14
4.5 Surface utilities . 15
4.5.1 Treatment of recovered water . 15
4.5.2 Fuel gas system . 15
4.5.3 Instrument system . 15
4.5.4 Corrosion protection . 15
4.5.5 Power supplies. 15
4.5.6 Earthing . 15
4.5.7 Gas analysis and metering . 15
4.5.8 Others . 15
4.6 Leaching and debrining facilities for salt caverns . 15
4.7 Liquified petroleum gas . 16
4.7.1 Solid and liquid separation . 16
4.7.2 Liquid transfer . 16
4.7.3 Heating . 16
4.7.4 Cooling . 16
4.7.5 Conditioning . 16
4.7.6 Colourization . 17
4.8 Environmental conservation . 17
4.8.1 General. 17
4.8.2 Methane emissions . 17
4.8.3 Other gas emissions . 18
5 Design . 18
5.1 General . 18
5.2 Safety and environmental issues . 19
5.3 Engineering . 20
5.4 Security . 20
5.5 Pumps and compressors . 20
5.6 Process control and monitoring . 20
5.7 Security . 20
5.8 Back-up systems. 20
5.9 Manning levels . 20
5.10 Maintenance and inspection . 21
5.11 Flaring and venting . 21
5.12 Prevention and control of fires and explosions . 21
6 Construction . 21
7 Testing and commissioning . 21
8 Operation and maintenance . 22
8.1 Operating principles . 22
8.2 Health, safety and environment . 22
8.2.1 Safety management and health and environment . 22
8.2.2 Emergency procedures . 23
8.3 Adaptation to climate change . 23
8.3.1 Climate change effects . 23
8.3.2 Climate change impacts . 23
9 Abandonment. 25
9.1 General .
...

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