SIST EN 15004-2:2025

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN 15004-2:2020
Vgrajeni gasilni sistemi - Sistemi za gašenje s plinom - 2. del: Fizikalne lastnosti in
načrtovanje sistema za gašenje s plinom za gasilo FK-5-1-12 (ISO 14520-5:2024,
spremenjen)
Fixed firefighting systems - Gas extinguishing systems - Part 2: Physical properties and
system design of gas extinguishing systems for FK-5-1-12 extinguishant (ISO 14520-
5:2024, modified)
Ortsfeste Brandbekämpfungsanlagen - Löschanlagen mit gasförmigen Löschmitteln -
Teil 2: Physikalische Eigenschaften und Anlagenauslegung für Feuerlöschmittel FK-5-1-
12 (ISO 14520-5:2024, modifiziert)
Installations fixes de lutte contre l'incendie - Installations d'extinction à gaz - Partie 2 :
Propriétés physiques et conception des systèmes des installations d'extinction à gaz
pour agent extincteur FK-5-1-12 (ISO 14520-5:2024, modifiée)
Ta slovenski standard je istoveten z: EN 15004-2:2025
ICS:
13.220.10 Gašenje požara Fire-fighting
13.220.20 Požarna zaščita Fire protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15004-2
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 13.220.20 Supersedes EN 15004-2:2020
English Version
Fixed firefighting systems - Gas extinguishing systems -
Part 2: Physical properties and system design of gas
extinguishing systems for FK-5-1-12 extinguishant (ISO
14520-5:2024, modified)
Installations fixes de lutte contre l'incendie - Ortsfeste Brandbekämpfungsanlagen - Löschanlagen
Installations d'extinction à gaz - Partie 2 : Propriétés mit gasförmigen Löschmitteln - Teil 2: Physikalische
physiques et conception des systèmes d'extinction à Eigenschaften und Anlagenauslegung für
gaz pour agent extincteur FK-5-1-12 (ISO 14520- Feuerlöschmittel FK-5-1-12 (ISO 14520-5:2024,
5:2024, modifiée) modifiziert)
This European Standard was approved by CEN on 20 June 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15004-2:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Characteristics and uses . 5
4.1 General. 5
4.2 Use of FK-5-1-12 systems . 6
5 Safety of personnel . 9
6 System design . 9
6.1 Fill density . 9
6.2 Superpressurization . 11
6.3 Extinguishant quantity . 11
6.4 Other fill density and superpressurization levels . 14
7 Environmental properties . 14
Bibliography . 16

European foreword
This document (EN 15004-2:2025) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
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 2026, and conflicting national standards shall be
withdrawn at the latest by March 2026.
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 supersedes EN 15004-2:2020.
— new specifications for dimers have been added to Table 1;
— Scope: Nominal pressure level 70 bar and 50 bar was added;
— 6.1, Fill density: 70 bar storage containers were added.
The text of the International Standard ISO 14520-5:2024 from Technical Committee ISO/TC 21
“Equipment for fire protection and firefighting” of the International Organization for Standardization
(ISO) has been taken over as a European Standard by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI, with common modifications which are
indicated by a straight line in the margin of the text.
EN 15004 will consist of the following parts, under the general title Fixed firefighting systems — Gas
extinguishing systems:
— Part 1: Design, installation and maintenance;
— Part 2: Physical properties and system design of gas extinguishing systems for FK-5-1-12
extinguishant;
— Part 4: Physical properties and system design of gas extinguishing systems for HFC 125
extinguishant;
— Part 5: Physical properties and system design of gas extinguishing systems for HFC 227ea
extinguishant;
— Part 6: Physical properties and system design of gas extinguishing systems for HFC 23 extinguishant;
— Part 7: Physical properties and system design of gas extinguishing systems for IG-01 extinguishant;
— Part 8: Physical properties and system design of gas extinguishing systems for IG-100 extinguishant;
— Part 9: Physical properties and system design of gas extinguishing systems for IG-55 extinguishant;
— Part 10: Physical properties and system design of gas extinguishing systems for IG-541
extinguishant;
— Part 11: Physical properties and systems design of gas extinguishing systems for Halocarbon Blend
55 extinguishant.
The International Standards ISO 14520-2 and ISO 14520-11, which dealt with CF I and HFC 236fa
extinguishants, respectively, have not been implemented by CEN, as CF I is only valid for local application
and HFC 236fa extinguishant is only applicable for portable fire extinguishers and local application,
respectively, which is not covered by the scope.
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.
1 Scope
This document specifies requirements for gaseous fire-extinguishing systems, with respect to FK-5-1-12
extinguishant. It includes details of physical properties, specification, usage and safety aspects.
This document is applicable only to systems operating at nominal pressures of 25 bar, 34,5 bar, 42 bar,
50 bar and 70 bar with nitrogen propellant. This does not preclude the use of other systems.
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 amendments) applies.
EN 15004-1:2024, Fixed firefighting systems — Gas extinguishing systems — Part 1: Design, installation
and maintenance (ISO 14520-1:2023, modified)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15004-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Characteristics and uses
4.1 General
Extinguishant FK-5-1-12 shall conform to the specifications shown in Table 1.
FK-5-1-12 is a clear, colourless, almost odourless, electrically non-conductive gas with a density
approximately 11 times that of air.
The physical properties are shown in Table 2.
FK-5-1-12 extinguishes fires mainly by physical mechanism, but also by chemical mechanism to a limited
extent due to noncatalytic flame inhibition.

1 5 2
1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
Table 1 — Specifications for FK-5-1-12
Property Requirement
Purity 99,0 % mol/mol min.
–6
Acidity 3 × 10 mass fraction, max.
Water content 0,001 % mass fraction, max.
Non-volatile residue 0,03 % mass fraction, max.
Suspended matter or sediment None visible
a
Kinetic dimers of HFP < 2 850 mg/kg
b
Thermodynamic dimer of HFP + HF adduct < 95 mg/kg
a
Kinetic dimers of HFP (CAS Registry Number® 2070-70-4). (Chemical Abstracts Service (CAS) Registry
Number® is a trademark of the American Chemical Society (ACS). This information is given for the convenience
of users of this document and does not constitute an endorsement by CEN of the product named. Equivalent
products may be used if they can be shown to lead to the same results).
b
Thermodynamic dimer of HFP (CAS 1584-03-8) and its adduct (CAS 30320-28-6).

Table 2 — Physical properties of FK-5-1-12
Property Units Value
Molecular mass n/a 316,04
Boiling point at 1,013 bar (abs) °C 49,2
Freezing point °C –108,0
Critical temperature °C 168,66
Critical pressure bar 18,646
Critical volume cm /mol 494,5
Critical density kg/m 639,1
Vapour pressure 20 °C bar abs 0,326 0
Liquid density 20 °C g/ml 1,616
Saturated vapour density 20 °C kg/m 4,330 5
Specific volume of superheated vapour at 1,013 bar and 20 °C m /kg 0,071 9
Heat of vapourization at boiling point kJ/kg 88,0
Chemical formula CF CF C(O)CF(CF )
3 2 3 2
Chemical name Dodecafluoro-2-methylpentan-3-one
5 2
NOTE 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .

4.2 Use of FK-5-1-12 systems
FK-5-1-12 total flooding systems may be used for extinguishing fires of all classes within the limits
specified in EN 15004-1:2024, Clause 4.
The extinguishant requirements per volume of protected space are shown in Table 3 for various levels of
concentration. These are based on methods shown in EN 15004-1:2024, 7.6.
The extinguishing concentrations and design concentrations for heptane, and Surface Class A and Higher
Hazard Class A hazards are shown in Table 4.
Table 3 — FK-5-1-12 total flooding quantity
Temperature Specific FK-5-1-12 mass requirements per unit volume of protected space, m/V
volume (kg/m )
T S Design concentration (by volume)
°C m /kg 3 % 4 % 5 % 6 % 7 % 8 % 9 % 10 %
–20 0,060 9 0,507 7 0,684 0 0,864 0 1,040 7 1,235 7 1,427 5 1,623 6 1,824 1
–15 0,062 3 0,496 5 0,669 0 0,845 0 1,024 8 1,208 4 1,396 1 1,587 9 1,783 9
–10 0,063 7 0,485 9 0,654 5 0,826 8 1,002 7 1,182 4 1,366 0 1,553 7 1,745 5
–5 0,065 0 0,475 6 0,640 7 0,809 4 0,981 6 1,157 5 1,337 2 1,520 9 1,708 7
0 0,066 4 0,465 8 0,627 5 0,792 6 0,961 3 1,133 6 1,309 6 1,489 5 1,673 4
5 0,067 8 0,456 4 0,614 8 0,776 6 0,941 8 1,110 6 1,283 1 1,459 3 1,639 5
10 0,069 1 0,447 3 0,602 6 0,761 2 0,923 2 1,088 6 1,257 6 1,430 4 1,607 0
15 0,070 5 0,438 6 0,590 9 0,746 4 0,905 2 1,067 4 1,233 2 1,402 6 1,575 7
20 0,071 9 0,430 2 0,579 6 0,732 2 0,887 9 1,047 1 1,209 6 1,37
...