prEN 1918-5 rev

Gas infrastructure - Underground gas storage - Part 5: Functional recommendations for surface facilities prEN 1918-5 rev

Scope

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" is 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:
• Methane-rich gases:
o Compressed Natural Gas
o Biomethane
o Synthetic methane
• Other hydrocarbon gases such as:
o Ethylene
o LPG (Liquified Petroleum Gas)
• Hydrogen of various purities
• Any mixtures of the gases above
NOTE Correspondingly this document may be considered where applicable for underground storage of any other fluid e.g. helium, carbon dioxide, compressed air, rDME (renewable Dimethylether) and hydrogen transport fluids (such as ammonia and LOHC) in salt caverns.
This document specifies common basic principles for underground gas storage facilities. Users of this document should be aware that more detailed standards and/or codes of practice exist. A non-exhaustive list of relevant European and international standards can be found in Annex A.
This document is intended to be applied in association with these national standards and/or codes of practice and does not replace them.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE CEN/TR 13737 (all parts) contains:
— clarification of relevant legislation/regulations applicable in a country;
— if appropriate, more restrictive national requirements;
— national contact point for the latest information.
This document is not intended to be applied retrospectively to existing facilities.
NOTE Correspondingly this document may be considered for major conversions in case of significant change of gas composition.