ISO 14520-5:2019

ISO TC 21/SC 8 N497
Date: 2016-09-15
ISO/PRF 14520-5:2019(E)
Secretariat: SA
Gaseous fire extinguishing systems — Physical properties and system design —
Part 5: FK-5-1-12 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux -- Propriétés physiques
et conception des systèmes -- Partie 5: Agent extincteur FK-5-1-12

ISO/PRF 14520-5:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national
standards bodies (ISO member bodies). The work of preparing International Standards is normally
carried out through ISO technical committees. Each member body interested in a subject for which a
technical committee has been established has the right to be represented on that committee.
International organizations, governmental and non-governmental, in liaison with ISO, also take part in
the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 8, Gaseous media and firefighting systems using gas.
This third edition cancels and replaces the second edition (ISO 14520-5:2016), which has been
technically revised. The main changes compared to the previous edition are as follows:
— a new subclause 6.4 on fill density and superpressurization levels has been added.
A list of all parts in the ISO 14520 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
ii © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO/PRF 14520-5:2019(E)

Gaseous fire extinguishing systems — Physical properties and
system design — Part 5: FK-5-1-12 extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect to
FK-5-1-12 extinguishant. It includes details of physical properties, specifications, usage and safety
aspects.
This document is applicable only to systems operating at nominal pressures of 25 bar, 34,5 bar, 42 bar
and 50 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.
ISO 14520-1, Gaseous fire-extinguishing systems — Physical properties and system design — Part 1:
General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14520-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Characteristics and uses
4.1 General
Extinguishant FK-5-1-12 shall comply with the specification 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 means, but also by some chemical means.
Table 1 — Specification for FK-5-1-12
Property Requirement
ISO/PRF 14520-5:2019(E)
Purity 99,0 % mol/mol min.
–6
Acidity 3 × 10 by mass, max.
Water content 0,001 % by mass, max.
Non-volatile residue 0,03 % by mass, max.
Suspended matter or sediment None visible
Table 2 — Physical properties of FK-5-1-12
Property Units Value
Molecular mass n/a 316,04
Boiling point at 1 013 bar
°C 49,2
(absolute)
Freezing point °C –108,0
Critical temperature °C 168,66
Critical pressure bar 18,646
Critical volume cc/mole 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
m /kg 0,071 9
vapour at 1 013 bar and 20 °C
Heat of vapourization at boiling
KJ/kg 88,0
point
Chemical formula CF CF C(O)CF(CF )
3 2 3 2
Dodecafluoro-2-methylpentan-3-one
Chemical name
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 ISO 14520-1:2015, 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 ISO 14520-1:2015, 7.6.
The extinguishing concentrations and design concentrations for heptane and Surface Class A hazards
are shown in Table 4. Concentrations for other fuels are shown in Table 5 and inerting concentrations
in Table 6.
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 (kg/m )
volume
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
2 © ISO 2019 – All rights reserved

ISO/PRF 14520-5:2019(E)
–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 0,0870 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 8 0,722 5 0,852 0 0,984 3 1,119 5 1,257 7
85 0,089 7 0,344 7 0,464 4 0,586 6 0,711 5 0,839 0 0,969 2 1,102 4 1,238 5
90 0,091 1 0,339 5 0,457 4 0,577 8 0,700 8 0,826 3 0,954 7 1,085 8 1,219 8
95 0,092 5 0,334 5 0,450 7 0,569 2 0,690 4 0,814 1 0,940 5 1,069 7 1,201 4
100 0,093 8 0,329 6 0,444 1 0,560 9 0,680 3 0,802 2 0,926 7 1,054 0 1,184 2
NOTE  This information refers only to FK-5-1-12 and does not represent any other product containing
dodecafluoromethylpentan-3-one as a component.
Symbols:
m/V is the agent mass requirements (kg/m ), i.e. mass, m, in kilograms of agent required per cubic metre of protected
volume, V, to produce the indicated concentration at the temperature specified;
V is the net volume of hazard (m ), i.e. the enclosed volume minus the fixed structures impervious to extinguishant
cV
m=

100−cS

T is the temperature (°C), i.e. the design temperature in the hazard area;
S is the specific volume (m /kg), the specific volume of superheated FK-5-1-12 vapour at a pressure of 1,013 bar may be
approximated by the formula:
S = k1 + k2T
where
k1 = 0,066 4;
k = 0,000 274.
c is the concentration (%), i.e. the volumetric concentration of FK-5-1-12 in air at the temperature indicated and a pressure
of 1,013 bar absolute.
ISO/PRF 14520-5:2019(E)
Table 4 — FK-5-1-12 reference extinguishing and design concentrations
Fuel Extinguishment Minimum design
% by volume % by volume
Class B
...