CEN ISO/TS 21805:2019

Guidance on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems (ISO/TS 21805:2018)

This document provides guidance on fulfilling the requirements contained in ISO 6183:2009, 6.4.1 and 7.4.1 and ISO 14520-1:2015, 5.2.1 h and 5.3 h, in respect to over and under pressurisation 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.

Anleitung für die Konstruktion, Auswahl und Installation von Entlüftungen zur Gewährleistung der strukturellen Integrität von Gehäusen, die durch ortsfeste Gaslöschanlagen geschützt sind (ISO/TS 21805:2018)

Dieses Dokument enthält Anleitungen für die Erfüllung der Anforderungen von ISO 6183:2009, 6.4.1 und 7.4.1, sowie von ISO 14520 1:2015, 5.2.1 h) und 5.3 h), in Bezug auf Über- und Unterdruckentlastungs-vorrichtung und die Nachentlüftung.
Es behandelt die Auslegung, Auswahl und Installation von Entlüftungsvorrichtungen, mit dem Ziel, die strukturelle Integrität von Räumen sicherzustellen, die durch ortsfeste Gaslöschanlagen geschützt sind, und betrachtet die Anforderungen an die Nachentlüftung, sofern verwendet.

Lignes directrices pour la conception, la sélection et l'installation d'évents pour préserver l'intégrité structurelle des enceintes protégées par des systèmes fixes de lutte contre l'incendie à gaz (ISO/TS 21805:2018)

Navodilo za projektiranje, izbiro in vgradnjo prezračevalnih naprav za zagotavljanje strukturne integritete namestitvenih prostorov, zaščitenih s sistemi za gašenje s plinom (ISO/TS 21805:2018)

Ta dokument vsebuje napotke za izpolnjevanje zahtev iz standardov BS EN15004-1 in BS 5306-4 glede prezračevanja s podtlakom in nadtlakom – točki 7.4.1 in 10.3.3. ter odzračevanja – točki 5.3 h) in 15.9.
Upošteva projektiranje, izbiro in vgradnjo prezračevalnih naprav za zagotavljanje strukturne integritete namestitvenih prostorov, zaščitenih s fiksnimi sistemi za gašenje s plinom, in določbe za naknadno odzračevanje.

General Information

• Status: Withdrawn
• Publication Date: 22-Jan-2019
• Withdrawal Date: 28-Feb-2023
• ICS: 13.220.10 - Fire-fighting
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: CEN/TC 191 - Fixed firefighting systems
• Drafting Committee: CEN/TC 191 - Fixed firefighting systems
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 01-Mar-2023
• Ref Project: SIST-TS CEN ISO/TS 21805:2019 - Guidance on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems (ISO/TS 21805:2018)

Relations

• Replaced By: EN ISO 21805:2023 - Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems (ISO 21805:2023)
• Effective Date: 18-Sep-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2019
1DYRGLOR]DSURMHNWLUDQMHL]ELURLQYJUDGQMRSUH]UDþHYDOQLKQDSUDY]D
]DJRWDYOMDQMHVWUXNWXUQHLQWHJULWHWHQDPHVWLWYHQLKSURVWRURY]DãþLWHQLKVVLVWHPL
]DJDãHQMHVSOLQRP,6276
Guidance on design, selection and installation of vents to safeguard the structural
integrity of enclosures protected by gaseous fire-extinguishing systems (ISO/TS
21805:2018)
Anleitung für die Konstruktion, Auswahl und Installation von Entlüftungen zur
Gewährleistung der strukturellen Integrität von Gehäusen, die durch ortsfeste
Gaslöschanlagen geschützt sind (ISO/TS 21805:2018)
Lignes directrices pour la conception, la sélection et l'installation d'évents pour préserver
l'intégrité structurelle des enceintes protégées par des systèmes fixes de lutte contre
l'incendie à gaz (ISO/TS 21805:2018)
Ta slovenski standard je istoveten z: CEN ISO/TS 21805:2019
ICS:
13.220.10 Gašenje požara Fire-fighting
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN ISO/TS 21805
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
January 2019
TECHNISCHE SPEZIFIKATION
ICS 91.140.30; 13.220.10
English Version
Guidance on design, selection and installation of vents to
safeguard the structural integrity of enclosures protected
by gaseous fire-extinguishing systems (ISO/TS
21805:2018)
Lignes directrices pour la conception, la sélection et Anleitung für die Konstruktion, Auswahl und
l'installation d'évents pour préserver l'intégrité Installation von Entlüftungen zur Gewährleistung der
structurelle des enceintes protégées par des systèmes strukturellen Integrität von Gehäusen, die durch
fixes de lutte contre l'incendie à gaz (ISO/TS ortsfeste Gaslöschanlagen geschützt sind (ISO/TS
21805:2018) 21805:2018)
This Technical Specification (CEN/TS) was approved by CEN on 30 November 2018 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 21805:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (CEN ISO/TS 21805:2019) has been prepared by Technical Committee ISO/TC 21
"Equipment for fire protection and fire fighting" in collaboration with Technical Committee CEN/TC
191 “Fixed firefighting systems” the secretariat of which is held by BSI.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this Technical Specification : Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO/TS 21805:2018 has been approved by CEN as CEN ISO/TS 21805:2019 without any
modification.
TECHNICAL ISO/TS
SPECIFICATION 21805
First edition
2018-12
Guidance on design, selection and
installation of vents to safeguard the
structural integrity of enclosures
protected by gaseous fire-
extinguishing systems
Lignes directrices pour la conception, la sélection et l'installation
d'évents pour préserver l'intégrité structurelle des enceintes protégées
par des systèmes fixes de lutte contre l'incendie à gaz
Reference number
ISO/TS 21805:2018(E)
©
ISO 2018
ISO/TS 21805:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO/TS 21805:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Use and limitations . 3
6 Safety . 4
6.1 Structural safety . 4
6.2 Personnel safety . 4
7 System design — Pressure-relief venting . 4
7.1 General . 4
7.2 Extinguishant characteristics . 4
7.2.1 Pressure graphs . 5
7.3 Enclosure characteristics . 7
7.4 Pressure-relief vent paths . 7
7.5 Types of pressure-relief vents . 7
7.5.1 General. 7
7.5.2 Gravity vents . 7
7.5.3 Counter weighted flap vent. 8
7.5.4 Electrically operated vents . 8
7.5.5 Pneumatically operated vent . 9
7.5.6 Vent accessories . 9
7.6 Pressure-relief vent characteristics .10
7.6.1 Vent efficiency .10
7.6.2 Minimum opening pressure .11
7.6.3 Minimum closing pressure .11
7.6.4 Fire rating.11
7.7 Vent location and mounting .11
7.7.1 Vent location .11
7.7.2 Vent mounting .12
7.8 Pressure-relief vent area calculations .13
7.8.1 Use of agent-specific equations .13
7.8.2 Vent area requirement (non-liquefiable gases and CO ) .14
7.8.3 Vent area requirements (liquefiable gases) .18
7.8.4 Leakage .22
7.9 Cascade venting calculations .23
7.9.1 Example calculation 3 . .24
7.9.2 Cascade vent arrangements .25
7.9.3 Venting into adjacent enclosures .26
8 System design — Post discharge venting .28
9 Acceptance .28
10 Service and maintenance .28
Bibliography .
...