BS EN ISO 21805:2023 – TC
$246.62
Tracked Changes. 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 | 108 |
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 |
|---|---|
| 1 | 30471190 |
| 63 | A-30403333 |
| 64 | undefined |
| 66 | European foreword Endorsement notice |
| 68 | Foreword |
| 69 | Introduction |
| 71 | 1 Scope 2 Normative references 3 Terms and definitions |
| 72 | 4 Symbols and abbreviated terms |
| 73 | 5 Use and limitations |
| 74 | 6 Safety 6.1 Structural safety 6.2 Personnel safety 7 System design — Pressure-relief venting 7.1 General |
| 75 | 7.2 Extinguishant characteristics 7.2.1 Positive and negative pressurization 7.2.2 Pressure graphs |
| 76 | 7.3 Enclosure characteristics 7.4 Pressure-relief vent paths |
| 77 | 7.5 Types of pressure-relief vents 7.5.1 General 7.5.2 Gravity vents 7.5.3 Counterweighted flap vent |
| 78 | 7.5.4 Electrically-operated vents 7.5.5 Pneumatically-operated vent 7.5.6 Vent accessories |
| 79 | 7.6 Pressure-relief vent characteristics 7.6.1 Vent efficiency |
| 80 | 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 |
| 81 | 7.7.2 Vent mounting |
| 82 | 7.8 Pressure-relief vent area calculations 7.8.1 Use of agent-specific formulae |
| 83 | 7.8.2 Vent area requirement (non-liquefiable gases) |
| 86 | 7.8.3 Vent area requirement carbon dioxide 7.8.4 Vent area requirements (liquefiable gases) |
| 92 | 7.8.5 Leakage 7.9 Cascade venting calculations |
| 93 | 7.9.1 Example calculation 3: Cascade venting calculations for IG-541 (peak discharge) |
| 94 | 7.9.2 Cascade vent arrangements |
| 95 | 7.9.3 Venting into adjacent enclosures |
| 97 | 8 System design — Post-discharge venting 9 Acceptance 10 Service and maintenance |
| 99 | Annex A (informative) Development of agent-specific formulae for liquefiable gases |
| 104 | Annex B (informative) Method for development of agent-specific formulae for liquefiable gases |
| 106 | Bibliography |
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