1 Scope

This document specifies requirements and gives recommendations for the design, installation, testing, maintenance and safety of gaseous firefighting systems in buildings, plants or other structures, and the characteristics of the various extinguishants and types of fire for which they are a suitable extinguishing medium.

It covers total flooding systems primarily related to buildings, plants and other specific applications, utilizing electrically non-conducting gaseous fire extinguishants that do not leave a residue after discharge and for which there are sufficient data currently available to enable validation of performance and safety characteristics by an appropriate independent authority. This document does not apply to explosion suppression.

This document is not intended to indicate approval of the extinguishants listed therein by the appropriate authorities, as other extinguishants can be equally acceptable. CO₂ is not included as it is covered by other International Standards.

This document applies to the extinguishants listed in Table 1. It is essential that it be used in conjunction with the separate parts of the ISO 14520 series for specific extinguishants, as cited in Table 1.

Table 1 — Listed extinguishant

Extinguishant	Chemical	Formula	CAS No.	International Standard
FK-5-1-12	Dodecafluoro-2- methylpentan-3-one	CF₃CF₂C(O)CF(CF₃)₂	756-13-8	ISO 14520-5
HCFC-123	Dichlorotrifluoroethane	CHCl₂CF₃	306-83-2
HCFC-22	Chlorodifluoromethane	CHClF₂	75-45-6	ISO 14520-6
HCFC-124	Chlorotetrafluoroethane	CFClFCF₃	2837-89-0
	Isopropenyl-1- methylcyclohexene	C₁₀H₁₆	5989-27-5
HFC 125	Pentafluoroethane	CHF₂CF₃	354-33-6	ISO 14520-8
HFC 227ea	Heptafluoropropane	CF₃CHFCF₃	2252-84-8	ISO 14520-9
HFC 23	Trifluoromethane	CHF₃	75-46-7	ISO 14520-10
IG-01	Argon	Ar	74040-37-1	ISO 14520-12
IG-100	Nitrogen	N₂	7727-37-9	ISO 14520-13
	Nitrogen (50 %)	N₂	7727-37-9
IG-55	Argon (50 %)	Ar	74040-37-1	ISO 14520-14
	Nitrogen (52 %)	N₂	7727-37-9
IG-541	Argon (40 %)	Ar	74040-37-1	ISO 14520-15
	Carbon dioxide (8 %)	CO₂	124-38-9
Halocarbon Blend 55	E-1-chloro-3,3,3-trifluoropropene (50 % by mass)	CF₃CHCHCl	102687-65-0	ISO 14520-17
	Dodecafluoro-2- methylpentan-3-one (50% by mass)	CF₃CF₂C(O)CF(CF₃)₂	756-13-8

ISO 14520-1:2023

Gaseous fire-extinguishing systems. Physical properties and system design - Part 1: General requirements

Current

Published:

3 Feb 2023