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BS EN ISO 21805:2023

BS EN ISO 21805:2023

$189.07

Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems

Published By Publication Date Number of Pages
BSI 2023 46
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This document gives guidelines for fulfilling the requirements contained in ISO 6183:2022, 6.4.1 and 7.4.1 and ISO 14520?1:2023, 5.2.1 h) and 5.3 h), in respect to over- and under-pressurization venting and post-discharge extract. It considers the design, selection and installation of vents to safeguard the structural integrity of enclosures protected by fixed gaseous extinguishing systems and the post-discharge venting provisions where used.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols and abbreviated terms
11 5 Use and limitations
12 6 Safety
6.1 Structural safety
6.2 Personnel safety
7 System design — Pressure-relief venting
7.1 General
13 7.2 Extinguishant characteristics
7.2.1 Positive and negative pressurization
7.2.2 Pressure graphs
14 7.3 Enclosure characteristics
7.4 Pressure-relief vent paths
15 7.5 Types of pressure-relief vents
7.5.1 General
7.5.2 Gravity vents
7.5.3 Counterweighted flap vent
16 7.5.4 Electrically-operated vents
7.5.5 Pneumatically-operated vent
7.5.6 Vent accessories
17 7.6 Pressure-relief vent characteristics
7.6.1 Vent efficiency
18 7.6.2 Minimum opening pressure
7.6.3 Minimum closing pressure
7.6.4 Fire rating
7.7 Vent location and mounting
7.7.1 Vent location
19 7.7.2 Vent mounting
20 7.8 Pressure-relief vent area calculations
7.8.1 Use of agent-specific formulae
21 7.8.2 Vent area requirement (non-liquefiable gases)
24 7.8.3 Vent area requirement carbon dioxide
7.8.4 Vent area requirements (liquefiable gases)
30 7.8.5 Leakage
7.9 Cascade venting calculations
31 7.9.1 Example calculation 3: Cascade venting calculations for IG-541 (peak discharge)
32 7.9.2 Cascade vent arrangements
33 7.9.3 Venting into adjacent enclosures
35 8 System design — Post-discharge venting
9 Acceptance
10 Service and maintenance
37 Annex A (informative) Development of agent-specific formulae for liquefiable gases
42 Annex B (informative) Method for development of agent-specific formulae for liquefiable gases
44 Bibliography

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BS EN ISO 21805:2023
$189.07