ISO 14520-17:2022

INTERNATIONAL ISO
STANDARD 14520-17
First edition
2022-02
Gaseous fire-extinguishing systems —
Physical properties and system
design —
Part 17:
Halocarbon Blend 55
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 17: Mélange d'hydrocarbures halogénés 55
Reference number
© ISO 2022
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
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 Halocarbon Blend 55 . 2
5 Safety of personnel .4
6 System design . 5
6.1 Fill density . 5
6.2 Superpressurization . 5
6.3 Extinguishant quantity . 5
6.4 Other fill density and superpressurization levels . 8
7 Environmental properties . .9
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and
firefighting, Subcommittee SC 8, Gaseous media and firefighting systems using gas.
A list of all parts in the ISO 14520 series can be found on the ISO website.
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iv
Introduction
The ISO 14520 series consists of the following parts, under the general title Gaseous fire-extinguishing
systems — Physical properties and system design:
— Part 1: General requirements
— Part 2: Withdrawn
— Part 3: Withdrawn
— Part 4: Withdrawn
— Part 5: FK-5-1-12 extinguishant
— Part 6: Withdrawn
— Part 7: Withdrawn
— Part 8: HFC 125 extinguishant
— Part 9: HFC 227ea extinguishant
— Part 10: HFC 23 extinguishant
— Part 11: To be withdrawn
— Part 12: IG-01 extinguishant
— Part 13: IG-100 extinguishant
— Part 14: IG-55 extinguishant
— Part 15: IG-541 extinguishant
— Part 16: Withdrawn
— Part 17 (this document): Halocarbon Blend 55
v
INTERNATIONAL STANDARD ISO 14520-17:2022(E)
Gaseous fire-extinguishing systems — Physical properties
and system design —
Part 17:
Halocarbon Blend 55
1 Scope
This document provides specific requirements for gaseous fire-extinguishing systems with respect to
the Halocarbon Blend 55 extinguishant. It includes details of physical properties, specification, usage
and safety aspects. It also covers systems operating at nominal pressures of 25 bar, 35 bar and 42 bar,
superpressurized with nitrogen. This document does not preclude the use of other systems.
5 2
NOTE 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
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.
1)
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 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 Halocarbon Blend 55 shall comply with the specifications shown in Table 1.
Halocarbon Blend 55 [blend of 50 ± 3 % HFO-1233zd(E) and 50 ± 3 % FK-5-1-12 (by mass)] is a colourless,
almost odourless, electrically non-conductive gas, with a density approximately 6,38 times that of air.
Its physical properties are shown in Table 2.
Halocarbon Blend 55 extinguishes fires mainly by physical means, but also by some chemical means.
1) Under preparation. Stage at the time of publication ISO/DIS 14520-1:2022.
Table 1 — Specifications for Halocarbon Blend 55
Property Requirement
Purity 99,5 % by mass, min.
−4
Acidity 3 × 10 % by mass, max.
−4
Water content 10 × 10 % by mass, max.
−4
Non-volatile residue 300 × 10 % by mass, max.
Suspended matter or sediment None visible
a
Kinetic dimers of HFP < 5 600 mg/kg
b
Thermodynamic dimer of HFP + HF adduct < 190 mg/kg
a
Kinetic dimers of HFP (CAS 2070-70-4).
b
Thermodynamic dimer of HFP (CAS 1584-03-8) + its HF adduct (CAS 30320-28-6).
Table 2 — Physical properties of Halocarbon Blend 55
Property Units Value
Molecular mass — 184,72
Boiling point at 1,013 bar (absolute) °C 20,7
Freezing point °C -107
Critical temperature °C 159,2
Critical pressure bar (absolute) 28,92
Critical volume cm /mol 354,2
Critical density kg/m 521,6
Vapour pressure 20 °C bar (absolute) 0,988 0
Liquid density 20 °C kg/m 1 431,6
Saturated vapour density 20 °C kg/m 6,6
...