oSIST prEN 15004-2:2025

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)

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 bar1 with nitrogen propellant. This does not preclude the use of other systems.
1   1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm².

Ortsfeste Brandbekämpfungsanlagen - Löschanlagen mit gasförmigen Löschmitteln - Teil 2: Physikalische Eigenschaften und Anlagenauslegung für Feuerlöschmittel FK-5-1-12 (ISO 14520-5:2024, modifiziert)

Dieses Dokument legt Anforderungen an Löschanlagen mit gasförmigen Löschmitteln fest, bei denen FK-5-1-12 als Löschmittel angewendet wird. Es enthält Einzelheiten zu physikalischen Eigenschaften, zur Spezifikation, zum Einsatz und zu Sicherheitsaspekten.
Dieses Dokument ist ausschließlich auf Anlagen anwendbar, die bei Nenndrücken von 25 bar, 34,5 bar, 42 bar, 50 bar und 70 bar mit Stickstoff als Treibgas betrieben werden. Dies schließt nicht die Anwendung anderer Anlagen aus.

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)

Le présent document spécifie les exigences relatives aux installations d’extinction à gaz contenant de l’agent extincteur FK-5-1-12. Il inclut des détails relatifs à ses propriétés physiques, sa spécification, son usage ainsi que ses aspects de sécurité.
Le présent document s'applique uniquement aux installations fonctionnant à une pression nominale de 25 bar, 34,5 bar, 42 bar, 50 bar et 70 bar  surpressurisés à l’azote. Cela n’exclut pas l’utilisation d’autres systèmes.

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)

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Mar-2025
• ICS: 13.220.10 - Fire-fighting
• ICS: 13.220.20 - Fire protection
• Technical Committee: POZ - Požarna varnost
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 24-Jan-2025
• Due Date: 13-Jun-2025
• Ref Project: prEN 15004-2 - 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)

Relations

• Revises: SIST EN 15004-2:2020 - Fixed firefighting systems - Gas extinguishing systems - Part 2: Physical properties and system design of gas extinguishing systems for FK-5-1-12 extinguishant (ISO 14520-5:2019, modified)
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
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: prEN 15004-2
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2025
ICS 13.220.20 Will supersede 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 des installations Eigenschaften und Anlagenauslegung für
d'extinction à gaz pour agent extincteur FK-5-1-12 (ISO Feuerlöschmittel FK-5-1-12 (ISO 14520-5:2024,
14520-5:2024, modifiée) modifiziert)
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 191.
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 15004-2:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Characteristics and uses . 4
4.1 General. 4
4.2 Use of FK-5-1-12 systems . 5
5 Safety of personnel . 8
6 System design . 8
6.1 Fill density . 8
6.2 Superpressurization . 10
6.3 Extinguishant quantity . 10
6.4 Other fill density and superpressurization levels . 13
7 Environmental properties . 13
Bibliography . 15

European foreword
This document (prEN 15004-2:2025) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15004-2:2020.
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.

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 w/w, max.
Water content 0,001 % w/w, max.
Non-volatile residue 0,03 % w/w, 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 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 1,375 8 1,545 7
25 0,073 3 0,422 2 0,568 8 0,718 4 0,871 3 1,027 5 1,187 0 1,350 0 1,516 7
30 0,074 6 0,414 4 0,558 3 0,705 2 0,855 3 1,008 6 1,165 2 1,325 2 1,488 8
35 0,076 0 0,406 9 0,548 2 0,692 5 0,839 9 0,990 4 1,144 2 1,301 3 1,462 0
40 0,077 4 0,399 7 0,538 5 0,680 2 0,825 0 0,972 8 1,123 9 1,278 3 1,436 1
45 0,078 7 0,392 8 0,529 1 0,668 4 0,810 6 0,955 9 1,104 3 1,256 0 1,411 1
50 0,080 1 0,386 0 0,520 1 0,657 0 0,796 7 0,939 5 1,085 4 1,234 5 1,386 9
55 0,081 5 0,379 5 0,511 3 0,645 9 0,783 3 0,923 7 1,067 1 1,213 7 1,363 6
60 0,082 9 0,373 3 0,502 9 0,635 2 0,770 4 0,908 4 1,049 5 1,193 6 1,341 0
65 0,084 2 0,367 2 0,494 7 0,624 7 0,757 8 0,893 6 1,032 4 1,174 2 1,319 1
70 0,085 6 0,361 3 0,486 8 0,614 8 0,745 7 0,879 3 1,015 8 1,155 4 1,298 0
75 0,087 0 0,355 6 0,479 1 0,605 2 0,733 9 0,865 4 0,999 8 1,137 2 1,277 5
80 0,088 3 0,350 1 0,471 6 0,595
...