SIST EN 12845-3:2024

SLOVENSKI STANDARD
01-julij-2024
Vgrajene naprave za gašenje - Avtomatski sprinklerski sistemi - 3. del: Navodila za
zaščito pred potresi
Fixed firefighting systems - Automatic sprinkler systems - Part 3: Guidance for
earthquake bracing
Ortsfeste Brandbekämpfungsanlagen - Automatische Sprinkleranlagen - Leitfaden für
Erdbebensicherungen
Installations fixes de lutte contre l'incendie - Systèmes d'extinction automatiques du type
sprinkleur - Partie 3: Recommandation pour le contreventement sismique
Ta slovenski standard je istoveten z: EN 12845-3:2024
ICS:
13.220.10 Gašenje požara Fire-fighting
91.120.25 Zaščita pred potresi in Seismic and vibration
vibracijami protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12845-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 13.220.20 Supersedes CEN/TS 17551:2021
English Version
Fixed firefighting systems - Automatic sprinkler systems -
Part 3: Guidance for earthquake bracing
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Brandbekämpfungsanlagen - Automatische
d'extinction automatiques du type sprinkleur - Sprinkleranlagen - Teil 3: Leitfaden für
Partie 3 : Recommandation pour le contreventement Erdbebensicherungen
parasismique
This European Standard was approved by CEN on 8 April 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

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

EUROPÄISCHES KOMITEE FÜR NORMUN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12845-3:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Design principles . 7
5 Sway bracing and sprinkler pipe support . 7
5.1 General. 7
5.2 Sway brace design. 8
5.2.1 Steps in designing sway brace . 8
5.2.2 Step 1, define sway bracing locations . 9
5.2.3 Step 2, calculate seismic design load for each sway bracing location . 13
5.2.4 Step 3, select the proper sway bracing shape, size and maximum length . 22
5.2.5 Step 4, select the proper method to attach the sway bracing to the structure and to the
piping . 25
6 Flexibility . 32
6.1 General. 32
6.2 Flexible couplings . 32
6.2.1 General. 32
6.2.2 Risers and standpipes . 32
6.2.3 Horizontal main distribution pipes and distribution pipes . 33
6.2.4 Drops . 33
6.3 Seismic separation assemblies . 34
7 Clearance . 37
7.1 Clearance around piping through walls or floors . 37
7.2 Clearance at sprinklers . 37
8 Other provisions. 37
8.1 Bracing of suspended ceilings . 37
8.2 Water supply . 37
8.3 Storage racks with in-rack sprinklers . 37
Bibliography . 38

European foreword
This document (EN 12845-3:2024) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2024, and conflicting national standards shall
be withdrawn at the latest by November 2024.
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.
This document supersedes CEN/TS 17551:2021.
In comparison with the previous edition, CEN/TS 17551:2021, the following technical modifications have
been made:
• scope of the document has been adjusted;
• ambiguities in the body text have been redrafted;
• figures have been updated.
This standard is included in a series of European standards:
CEN/TS 14816, Fixed firefighting systems — Water spray systems — Design, installation and maintenance;
EN 671 (all parts), Fixed firefighting systems — Hose systems;
EN 12094 (all parts), Fixed firefighting systems — Components for gas extinguishing systems;
EN 12101 (all parts), Smoke and heat control systems;
EN 12259 (all parts), Fixed firefighting systems — Components for automatic sprinkler and water spray
systems;
EN 12416 (all parts), Fixed firefighting systems — Powder systems;
EN 12845-1, Fixed firefighting systems — Automatic sprinkler systems — Part 1: Design, installation and
maintenance;
EN 12845-2, Fixed firefighting systems — Automatic sprinkler systems — Part 2: Design and installation of
ESFR and CMSA sprinkler systems;
EN 13565 (all parts), Fixed firefighting systems — Foam systems;
EN 14972 (all parts), Fixed firefighting systems — Water mist systems;
EN 17451, Fixed firefighting systems — Automatic sprinkler systems — Design, assembly, installation and
commissioning of pump sets.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
This document specifies requirements for earthquake protection of automatic sprinkler systems (see the
EN 12845 series of standards) and can be applicable to other water based fixed manual or automatic fire
fighting systems, according to local requirements. Requirements made herein are intended to greatly
improve the likelihood that the fire protection systems will remain in working condition during and after
an earthquake and minimize or prevent any potential water damage from fixed firefighting systems
leakage due to an earthquake.
This document does not cover all legislative requirements. In certain countries, specific national
regulations apply and take precedence over this document. Users of this document are advised to inform
themselves of the applicability or non-applicability for this document by their national responsible
authorities.
1 Scope
This document specifies requirements for earthquake protection of automatic sprinkler systems in
accordance with EN 12845:2015+A1:2019.
This document applies only to locations in earthquake zones in accordance with EN 1998-1:2004, 3.2.1
and the Nationally Determined Parameters.
NOTE The requirements in this document are based on the principle that certain peak ground acceleration
values are considered as an earthquake which require special means. Attention is drawn to EN 1998-1:2004 , where
a peak ground acceleration above 0,08 g (0,78 m/s ) is considered an earthquake risk. Additional characteristics,
NDP and/or NCI can exist in some countries as well as national annexes.
The principles defined in this document can be applicable to other water based fixed manual or automatic
fire fighting systems, according to local requirements.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1992-4, Eurocode 2 — Design of concrete structures — Part 4: Design of fastenings for use in concrete
EN 1998-1:2004 , Eurocode 8: Design of structures for earthquake resistance — Part 1: General rules,
seismic actions and rules for buildings
EN 12845, Fixed firefighting systems — Automatic sprinkler systems — Design, installation and
maintenance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1998-1:2004 , EN 12845 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
zone of influence
portion of the piping system reinforced by a single sway brace which is calculated on both risers and
horizontal pipes
Note 1 to entry: Depending if related to a lateral or a longitudinal brace, it can include main distribution or
distribution pipes and range pipes or main distribution or distribution pipes only (see 5.2.3.4, 5.2.3.5, 5.2.3.6).
3.2
seismic separation assembly
equipment of fittings, pipe, flexible pipe, and/or couplings that permits movement in all directions to
accommodate seismic differential movement across building seismic separation joints

As impacted by EN 1998-1:2004/AC:2009 and EN 1998-1:2004/A1:2013.
3.3
tension only bracing
equipment with slenderness ratio length to least radius of gyration larger than 200
3.4
fastener
attachment elements to the structure
3.5
sway brace
group of elements intended to prevent differential movements between pipes and structural elements
4 Design principles
Requirements given in this document fall into the following seven principles:
— brace sprinkler piping and other sprinkler related equipment (see 8.2) to minimize uncontrolled
differential movement between these ins
...