ISO 14520-5:2016

INTERNATIONAL ISO
STANDARD 14520-5
Second edition
2016-09-15
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 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – 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
7 Environmental properties . 9
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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electrotechnical standardization.
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different types of ISO documents should be noted. This document was drafted in accordance with the
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The committee responsible for this document is ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 8, Gaseous media and firefighting systems using gas.
This second edition cancels and replaces the first edition (ISO 14520-5:2006), which has been
technically revised with the following changes:
— corrected the purity specification in Table 1;
— added reference to 34,5 bar and 50 bar systems in 6.1 and 6.2;
— added tables for 34,5 bar and 50 bar systems storage container characteristics data;
— added figures for pressure vs. temperature charts for 34,5 bar and 50 bar systems;
— added Clause 7.
A list of all parts in the ISO 14520 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 14520-5:2016(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, specification, usage and safety
aspects.
This document covers only 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.
–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 0,3260
Liquid density 20 °C g/ml 1,616
Saturated vapour density 20 °C kg/m 4,3305
Specific volume of superheated
m /kg 0,0719
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 0,0609 0,5077 0,6840 0,8640 1,0407 1,2357 1,4275 1,6236 1,8241
–15 0,0623 0,4965 0,6690 0,8450 1,0248 1,2084 1,3961 1,5879 1,7839
–10 0,0637 0,4859 0,6545 0,8268 1,0027 1,1824 1,3660 1,5537 1,7455
–5 0,0650 0,4756 0,6407 0,8094 0,9816 1,1575 1,3372 1,5209 1,7087
0 0,0664 0,4658 0,6275 0,7926 0,9613 1,1336 1,3096 1,4895 1,6734
2 © ISO 2016 – All rights reserved

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