ISO 14520-1:2023
(Main)Gaseous fire-extinguishing systems — Physical properties and system design — Part 1: General requirements
Gaseous fire-extinguishing systems — Physical properties and system design — Part 1: General requirements
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.
Systèmes d'extinction d'incendie utilisant des agents gazeux — Propriétés physiques et conception des systèmes — Partie 1: Exigences générales
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14520-1
Fourth edition
2023-02
Gaseous fire-extinguishing systems —
Physical properties and system
design —
Part 1:
General requirements
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 1: Exigences générales
Reference number
© ISO 2023
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Published in Switzerland
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Contents Page
Foreword . vi
Introduction .viii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
4 Use and limitations . 6
4.1 General . 6
4.2 Extinguishants. 6
4.2.1 General . 6
4.2.2 Environmental properties . 7
4.3 Electrostatic discharge . 7
4.4 Compatibility with other extinguishants . 7
4.5 Temperature limitations . 7
5 Safety . 8
5.1 Hazard to personnel . 8
5.2 Safety precautions . 8
5.2.1 General . 8
5.2.2 For normally occupied areas . 9
5.2.3 For normally unoccupied areas . 10
5.2.4 For unoccupiable areas . 10
5.3 Occupiable areas . 10
5.4 Electrical hazards . 11
5.5 Electrical earthing .12
5.6 Electrostatic discharge .12
6 System design .12
6.1 General .12
6.2 Extinguishant supply . 12
6.2.1 Quantity . 12
6.2.2 Quality . 12
6.2.3 Container arrangement .12
6.2.4 Storage containers .13
6.3 Distribution . 14
6.3.1 General . 14
6.3.2 Piping . 15
6.3.3 Fittings .15
6.3.4 Pipe and valve supports . 15
6.3.5 Valves . 16
6.3.6 Nozzles . 16
6.3.7 Pressure reducing orifice assembly . 17
6.4 Detection, actuation and control systems . 17
6.4.1 General . 17
6.4.2 Automatic detection . 17
6.4.3 Operating devices . 18
6.4.4 Control equipment . 18
6.4.5 Operating alarms and indicators . 19
6.4.6 Hold switches . 19
7 Extinguishant system design.19
7.1 General . 19
7.2 Specifications, plans and approvals. 19
7.2.1 Specifications . 19
7.2.2 Working documents . 19
7.3 System flow calculations . 20
iii
7.3.1 General .20
7.3.2 A balanced and unbalanced system . 20
7.3.3 Friction losses . 21
7.3.4 Pressure drop. 21
7.3.5 Elevation changes . 22
7.3.6 Valves and fittings . 22
7.3.7 Piping length . 22
7.3.8 Drawings .22
7.3.9 Liquefied gases — Specific requirements . .22
7.4 Enclosures. 22
7.5 Effects of noise . 22
7.6 Extinguishant concentration requirements . 23
7.6.1 Flame extinguishment. 23
7.6.2 Inerting . 24
7.7 Total flooding quantity . 25
7.7.1 General . 25
7.7.2 Liquefied gases . . 25
7.7.3 Non-liquefied gas . 25
7.8 Altitude adjustment .
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