ISO 14520-5:2019

INTERNATIONAL ISO
STANDARD 14520-5
Third edition
2019-06
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
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Characteristics and uses . 1
4.1 General . 1
4.2 Use of FK-5-1-12 systems . 2
5 Safety of personnel . 5
6 System design . 5
6.1 Fill density. 5
6.2 Superpressurization . 6
6.3 Extinguishant quantity . 6
6.4 Other fill density and superpressurization levels . 9
7 Environmental properties . 9
Bibliography .11
Foreword
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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
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iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 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
Purity 99,0 % mol/mol min.
Table 1 (continued)
Property Requirement
–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 (absolute) °C 49,2
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
Chemical name
Dodecafluoro-2-methylpentan-3-one
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
–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
2 © ISO 2019 – All rights reserved

Table 3 (continued)
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 %
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
c V
 
m=
 
100−c S
 
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 = k + k T
1 2
where
k = 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.
Table 4 — FK-5-1-12 reference extinguishing and design concentrations
Fuel Extinguishment Minimum design
% by volume % by volume
Class B
Heptane (cup burner) 4,5 5,9
Heptane (room test) 4,4
Surface Class A
Wood crib 3,4
PMMA 4,1 5,3
PP 4,0
ABS 4,0
Higher Hazard Class A See NOTE 4 5,6
NOTE 1  The extinguishment values for the Class B and the Surface Class A fuels are
determined by testing in accordance with ISO 14520-1:2015, Annexes B and C.
NOTE 2  The minimum design concentration for the Class B fuel is the higher value of the
heptane cup burner or room test heptane extinguishment concentration multiplied by 1,3.
NOTE 3  The minimum design concentration for Surface Class A fuel is the highest value of the
wood crib, PMMA, PP or ABS extinguishment concentrations multiplied by 1,3. In the absence
of any of the four extinguishment values, the minimum design concentration for Surface Class
A is that of Higher Hazard Class A.
NOTE 4  The minimum design concentration
...