ISO 14520-11:2016

SLOVENSKI STANDARD
01-oktober-2018
Naprave za gašenje s plinom - Fizikalne lastnosti in projektiranje - 11. del: Gasilo
HFC 236fa
Gaseous fire-extinguishing systems -- Physical properties and system design -- Part 11:
HFC 236fa extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux -- Propriétés physiques et
conception des systèmes -- Partie 11: Agent extincteur HFC 236fa
Ta slovenski standard je istoveten z: ISO 14520-11:2016
ICS:
13.220.10 Gašenje požara Fire-fighting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 14520-11
Third edition
2016-10-01
Gaseous fire-extinguishing systems —
Physical properties and system
design —
Part 11:
HFC 236fa extinguishant
Systèmes d’extinction d’incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 11: Agent extincteur HFC 236fa
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 HFC 236fa systems . 2
5 Safety of personnel . 5
6 System design . 6
6.1 Fill density. 6
6.2 Superpressurization . 7
6.3 Extinguishant quantity . 7
7 Environmental properties . 8
Foreword
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electrotechnical standardization.
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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).
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Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 8, Gaseous media and fire fighting systems using gas.
This third edition cancels and replaces the second edition (ISO 14520-11:2005), which has been
technically revised with the following changes:
— in Table 5, minimum design data was corrected from previous edition; all but values for ethanol and
methanol were incorrect;
— 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 14520-11:2016(E)
Gaseous fire-extinguishing systems — Physical properties
and system design —
Part 11:
HFC 236fa extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect to
the HFC 236fa extinguishant. It includes details of physical properties, specification, usage and safety
aspects.
This document covers systems operating at nominal pressures of 25 bar and 42 bar superpressurized
with nitrogen. 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 14520-1:2015, 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 HFC 236fa shall comply with the specification shown in Table 1.
HFC 236fa is a colourless, almost odourless, electrically non-conductive gas with a density approximately
five times that of air.
The physical properties are shown in Table 2.
HFC 236fa extinguishes fires mainly by physical means, but also by some chemical means.
Table 1 — Specification for HFC 236fa
Property Requirement
Purity 99,6% by mass, min.
–6
Acidity 3 × 10 by mass, max.
–6
Water content 10 × 10 by mass, max.
Non-volatile residue 0,01 % by mass, max.
Suspended matter or sediment None visible
Table 2 — Physical properties of HFC 236fa
Property Units Value
Molecular mass — 152
Boiling point at 1,013 bar (absolute) °C –1,4
Freezing point °C –103
Critical temperature °C 124,9
Critical pressure bar abs 32,00
Critical volume cm /mol 274,0
Critical density kg/m 551,3
Vapour pressure 20 °C bar abs 2,296
Liquid density 20 °C kg/m 1 377
Saturated vapour density 20 °C kg/m 15,58
Specific volume of superheated vapour m /kg 0,1529
at 1,013 bar and 20 °C
Chemical formula CF CH CF
3 2 3
Chemical name
Hexafluoropropane
4.2 Use of HFC 236fa systems
HFC 236fa 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 various types of hazard are shown in
Table 4. Concentrations for other fuels are shown in Table 5.
2 © ISO 2016 – All rights reserved

Table 3 — HFC 236fa total flooding quantity
Tempera- Specific HFC 236fa mass requirements per unit volume of protected space, m/V (kg/m )
ture vapour
volume
Design concentration (by volume)
T
S
°C
m /kg 5 % 6 % 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 %
0 0,141 3
...