oSIST prEN 12845-2:2022
(Main)Fixed firefighting systems - Automatic sprinkler systems - Part 2: Design and installation of ESFR and CMSA sprinkler systems
Fixed firefighting systems - Automatic sprinkler systems - Part 2: Design and installation of ESFR and CMSA sprinkler systems
This European standard specifies requirements for the design and installation of early suppression fast response (ESFR) and control mode specific application (CMSA) sprinklers in automatic sprinkler systems in accordance with this standard and EN 12845-1.
Ortsfeste Feuerlöschanlagen– Automatische Sprinkleranlagen– Teil2: Auslegung und Installation von Sprinklern zur frühzeitigen Unterdrückung und schnellen Reaktion
Dieses Dokument legt Anforderungen an die Auslegung und Installation von früh unterdrückenden schnell ansprechenden (ESFR) und brandkontrollmodusspezifischen (CMSA) Sprinklern in automatischen Sprinkler
anlagen (nach dieser Norm und auch nach EN12845-1) fest.
Dieses Dokument deckt nicht alle gesetzlichen Anforderungen ab. In bestimmten Ländern können besondere nationale Vorschriften gelten, die gegenüber diesem Dokument Vorrang haben. Anwendern dieses Dokuments wird empfohlen, sich selbst über die Anwendbarkeit oder Nichtanwendbarkeit dieses Dokuments bei ihren zuständigen nationalen Behörden zu informieren.
Installations fixes de lutte contre l'incendie - Systèmes d'extinction automatique du type sprinkleur - Partie 2 : Conception et installation de système de sprinkleurs ESFR et CMSA
Le présent document spécifie les exigences relatives à la conception et l'installation des sprinkleurs à suppression précoce à réponse rapide (Early Suppression Fast Response, ESFR) et des sprinkleurs à mode contrôle pour applications spécifiques (Control Mode Specific Application, CMSA) dans les systèmes d'extinction automatique de type sprinkleur (conformément à la présente norme ainsi qu'à l'EN 12845-1).
Le présent document ne traite pas des exigences légales. Dans certains pays, des réglementations nationales spécifiques peuvent s'appliquer et prendre le pas sur le présent document. Il est conseillé aux utilisateurs du présent document de s'informer auprès des autorités nationales responsables de l'applicabilité ou de la non-applicabilité du présent document.
Vgrajene naprave za gašenje - Avtomatski sprinklerski sistemi - 2. del: Projektiranje in vgradnja sprinklerskih sistemov ESFR in CMSA
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 12845-2:2022
01-december-2022
Vgrajene naprave za gašenje - Avtomatski sprinklerski sistemi - 2. del:
Projektiranje in vgradnja sprinklerskih sistemov ESFR in CMSA
Fixed firefighting systems - Automatic sprinkler systems - Part 2: Design and installation
of ESFR and CMSA sprinkler systems
Ortsfeste Feuerlöschanlagen– Automatische Sprinkleranlagen– Teil2: Auslegung und
Installation von Sprinklern zur frühzeitigen Unterdrückung und schnellen Reaktion
Installations fixes de lutte contre l'incendie - Systèmes d'extinction automatique du type
sprinkleur - Partie 2 : Conception et installation de système de sprinkleurs ESFR et
CMSA
Ta slovenski standard je istoveten z: prEN 12845-2
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 12845-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 12845-2:2022
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oSIST prEN 12845-2:2022
DRAFT
EUROPEAN STANDARD
prEN 12845-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2022
ICS 13.220.20 Will supersede EN 12845:2015+A1:2019
English Version
Fixed firefighting systems - Automatic sprinkler systems -
Part 2: Design and installation of ESFR and CMSA sprinkler
systems
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Feuerlöschanlagen- Automatische
d'extinction automatique du type sprinkleur - Partie 2 : Sprinkleranlagen- Teil2: Auslegung und Installation
Conception et installation de système de sprinkleurs von Sprinklern zur frühzeitigen Unterdrückung und
ESFR et CMSA schnellen Reaktion
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 191.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12845-2:2022 E
worldwide for CEN national Members.
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oSIST prEN 12845-2:2022
prEN 12845-2:2022 (E)
Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Symbols and abbreviated terms . 8
4 General. 8
Table 1 — Overview of the sequence of tasks and their corresponding clauses . 9
5 Installation requirements . 9
5.1 Sprinkler type, spacing, clearance and nominal operating temperature . 9
5.1.1 Sprinkler type . 9
5.1.2 Sprinkler installation type . 10
5.1.3 Sprinkler spacing, location and positioning relative to roof and ceilings. 10
Figure 1 — Maximum increase in linear and area spacing to avoid obstructing sprinkler
discharge . 11
Table 2 —Maximum allowable distance of sprinkler deflector . 12
Figure 2 — Spacing of sprinklers when installed in every bay channel formed by solid
structural members . 13
5.2 Construction and building limitations . 14
5.2.1 Roof or ceiling slope . 14
5.2.2 Strength of ceilings, sub-ceilings and suspended ceilings . 14
5.2.3 Skylights . 15
5.2.4 Heat and smoke vents or other ceiling vents . 15
Figure 3 — Quick-response sprinklers installed under automatic smoke and heat vents . 16
5.2.5 Natural exhaust openings at the ceiling . 16
Figure 4 — Quick-response sprinklers installed under ceiling-level exhaust devices . 17
5.2.6 Exhaust openings with or without fans and airflow velocities at ceiling-level
sprinklers . 17
Figure 5 — Sprinklered sub-ceiling below a ceiling vent or fan . 19
5.2.7 Solid mezzanines, walkways and conveyors . 19
5.3 Obstruction to discharge pattern of sprinklers . 19
5.3.1 General. 19
5.3.2 Obstruction located at or near ceiling . 19
Figure 6 —Objects near ceiling level not considered obstruction to ESFR and CMSA sprinkler
. 20
Figure 7 — Example or objects at ceiling level considered to obstruct ESFR and CMSA
sprinkler . 20
Figure 8 — Positioning ceiling level Sprinklers when structural members obstruct sprinkler
discharge of ESFR and CMSA sprinkler . 21
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Table 3 — Minimum horizontal distance of ceiling objects to avoid obstructing umbrella
patterns of sprinklers . 21
5.3.3 Obstruction entirely below sprinkler deflector level. 22
Figure 9 — Grouped obstructions . 22
Table 4 — Installation guidelines to avoid obstructions to inner core distribution pattern of
sprinklers . 23
Figure 10 — Allowed obstructions within discharge pattern of ceiling-level ESFR sprinklers
. 24
Table 5 — Supplementary sprinklers below obstructions . 25
Figure 11 — Supplementary sprinklers below obstructions . 25
Figure 12 — Additional sprinklers installed below flat, continuous, solid obstructions from
over 0,6 m wide to 3,0 m wide . 27
Figure 13 — Additional sprinklers installed below non-flat, continuous, solid obstructions
from over 0,6 m wide to 3,0 m wide . 27
Figure 14 — View of additional sprinklers installed below non-flat, non-continuous, or non-
solid obstructions over 0,6 m and up to 3,0 m wide without a flat, continuous, solid
barrier provided . 29
Figure 15 — Additional sprinklers installed below non-flat, non-continuous, or non-solid
obstructions over 0,6 m and up to 3,0 m wide without a flat, continuous, solid barrier
provided . 30
6 Design considerations . 31
6.1 General . 31
6.2 Protection of non-storage occupancies with ESFR and CMSA. 31
6.3 Sprinkler protection for adjacent areas using a different protection concept . 31
6.4 Considerations for water demand and water supply . 32
Table 6 — Water supply duration and shape of design . 32
6.5 Protection of unheated areas with ESFR . 33
6.6 Design with ESFR . 33
6.6.1 Ceiling only protection . 33
Table 7 — Minimum operating pressure for ESFR sprinklers design for HHS . 34
Table 8 — Minimum operating pressure for 12 ESFR sprinkler design for rubber tyres . 38
Table 9 — Minimum operating pressure for 12 ESFR sprinkler design for paper . 39
6.6.2 ESFR in combination with in-rack . 39
Table 10 — Ceiling sprinkler system design protection of HHS4 and lower HHS classes in
open-frame storage racks under ceilings up to 13,7 m high using K200 and larger,
pendent ceiling level ESFR sprinklers . 41
Figure 16 — Plan view of alternative in-rack sprinkler arrangement for single-row racks up
to 0,9 m deep . 42
Figure 17 — Plan view of alternative in-rack sprinkler arrangement for single-row racks up
to 1,8 m deep . 42
Figure 18 — Plan view of alternative in-rack sprinkler arrangement for single-row racks up
to 1,8 m deep located against a wall . 42
Figure 19 — Plan view of alternative in-rack sprinkler arrangement for double-row racks up
to 2,7 m deep . 43
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Figure 20 — Plan view of alternative in-rack sprinkler arrangement for double-row racks up
to 3,7 m deep . 43
Figure 21 — Plan view of alternative in-rack sprinkler arrangement for multiple-row racks
. 43
Table 11 — Number of sprinklers in the in-rack design . 44
Table 12 — Minimum flow in the modular in-rack design . 45
Figure 22 — Determining ceiling height . 46
6.7 Design with CMSA . 46
6.7.1 General design table . 46
Table 13 — Design criteria for STC1 storage . 47
Table 14 — Design criteria for STC4.1, STC4.2 and STC4.3 ceiling only . 49
Table 15 — Rubber tyres on thread or on side storage . 52
Table 16 — Heavyweight roll paper storage protection for on-end storage in standard or
closed array (excluding on-end storage in an open array). 52
Table 17 — Medium weight Roll Paper Storage Protection for on-end storage in standard or
closed array. (Excluding On-end storage in an open array) . 53
Table 18 — Lightweight roll paper storage protection for on-end storage in standard or
closed array (excluding on-end storage in an open array). 53
Annex A (informative) Extract for determining the hazard classification from EN 12845-1
. 54
Figure A.1 — Methodology and process of hazard classification . 55
Figure A.2 — Fire hazard classification process for storage commodities containing plastic
. 56
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oSIST prEN 12845-2:2022
prEN 12845-2:2022 (E)
European foreword
This document (prEN 12845-2:2022) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document is included in a series of European standards:
CEN/TS 14816, Fixed firefighting systems - Water spray systems - Design, installation and maintenance;
CEN/TS 17551, Fixed firefighting systems - Automatic sprinkler systems - Guidance for earthquake bracing;
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 sprinkler and water spray systems;
EN 12416 (all parts), Fixed firefighting systems - Powder systems;
EN 12845-1, Fixed firefighting systems - Automatic sprinkler systems - Design, installation and
maintenance;
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.
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prEN 12845-2:2022 (E)
Introduction
ESFR (early suppression fast response) sprinkler protection to this standard utilizes sprinklers in
accordance with EN 12259-13 operating in suppression mode, i.e. which have the capability of markedly
suppressing (reducing the heat release rate of) fires typically within storage risks. ESFR sprinkler
protection tends to be used in high hazard storage scenarios to provide effective ceiling-only sprinkler
protection (although ESFR protection schemes utilizing in-rack sprinkler heads do also exist). Designs
are typically specified in terms of numbers of heads operating and required head pressures.
CMSA (Control Mode Specific Application) sprinkler protection to this standard utilizes sprinklers
operating in control mode, i.e. which have the capability of controlling (limiting the heat release rate)
fires within storage risks. CMSA sprinkler protection tends to be used in a variety of especially challenging
high hazard storage scenarios, where alternative approaches are not considered suitable. Designs are
typically specified in terms of numbers of heads operating and required head pressures.
CMDA (control mode density area) sprinkler protection to EN 12845-1 typically utilizes sprinklers in
accordance with EN 12259-1 operating in control mode, i.e. which have the capability of controlling
(limiting the heat release rate) fires in residential, commercial, industrial or storage applications. CMDA
sprinkler protection tends to be used to good effect in a wide variety of built environment scenarios.
Designs are typically specified in terms of a minimum application rate of water “density” (mm/min) to
be applied over a specified area of operation “area”.
All three approaches are designed to provide rapid and effective control of a fire. The selection of the
most appropriate option is best entrusted to competent personnel. In all cases, it is expected that final
extinguishment to be performed by the Fire and Rescue Service will be necessary.
Both sprinkler types ESFR and CMSA were developed for storage fires. The ESFR sprinkler concept is a
technical innovation developed from CMSA sprinklers. ESFR and CMSA sprinkler designs are less able to
cope with adverse design features and non-compliances (e.g. those caused by incorrect design or change
in practice in the protected premises over time). The risk that design and installation deviations from this
standard are likely to result in a total system failure is highlighted, as is the particular importance of
complying with all the requirements of this standard, without exception.
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1 Scope
This document specifies requirements for the design and installation of early suppression fast response
(ESFR) and control mode specific application (CMSA) sprinklers in automatic sprinkler systems (in
accordance with this standard and additionally EN 12845-1).
This document does not cover all legislative requirements. In certain countries, specific national
regulations can 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.
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.
prEN 12845-1:2021, Fixed firefighting systems — Automatic sprinkler systems —Design, installation and
maintenance
EN 12259-1, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 1:
Sprinklers
EN 12259-13, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 13:
ESFR sprinklers
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12845-1, EN 12259-1,
EN 12259-13 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
open-top containers
boxes having an open on top and which can retain water
Note 1 to entry: Containers that have five sides will collect and hold up water that has been discharged from
operating ceiling-level sprinklers thus delaying the water delivery down through the flue spaces where it is needed
to either suppress or control the fire.
Note 2 to entry: Containers with less than five full-height sides redirect the discharged water from operating
sprinklers so that the water delivery down through the flues is not uniform. Five-sided, open-top containers made
of wood, cardboard, plastic, or other combustible material promote faster horizontal fire spread compared to
closed-top combustible containers.
Note 3 to entry: Non-combustible open-top containers help promote faster horizontal fire spread if combustible
containers are located below them within a storage rack. See Clause 4 when open-top containers are present within
a storage rack arrangement.
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3.1.2
closed array
roll paper storage arrangement with flues no more than 50 mm in one direction and no more than 25 mm
in the other direction
3. 1.3
standard array
roll paper storage arrangement with flues no more than 25 mm in one direction but more than 50 mm in
the other direction
3. 1.4
open array
roll paper storage arrangement where air movement through the pile is enhanced because of vertical
flues larger than those in standard or closed array
3. 1.5
banded roll paper storage
rolls provided with a circumferential steel strap of 10 mm or wider at each end of the roll
3.2 Symbols and abbreviated terms
For the purposes of this document, the following symbols and abbreviated terms apply.
ESFR early suppression fast response
CMSA control mode specific application
4 General
ESFR sprinkler shall be used in wet installations only. CMSA sprinkler may be used in wet and dry
installations.
Open top containers shall not be used in storage hazards protected by ESFR and CMSA sprinklers, unless
otherwise specifically stated in a clause in this standard. Open-top non-combustible containers can be
treated as closed-top non-combustible containers when:
• all of the storage located below the open-top non-combustible containers is either non-combustible
or in non-combustible containers, or
• all of the open-top non-combustible containers are located on the bottom tier of the storage rack.
For an overview of the sequence of tasks and their corresponding clauses see Table 1.
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Table 1 — Overview of the sequence of tasks and their corresponding clauses
Tasks Clauses
Contract planning and documentation prEN 12845-1:2021, Clause 4
Extent of protection prEN 12845-1:2021, Clause 5
Hazard review, identification and classification prEN 12845-1:2021, Clauses 6, 7 and 8
Hydraulic design criteria Clause 6
prEN 12845-1:2021, Clause 12
Pipe sizing, layout and hydraulic calculations
Sprinkler system components prEN 12845-1:2021, Clause 13
Installation type and size
prEN 12845-1:2021,14.1.3 and Clause 6
Spacing and location of sprinklers 5.1.3, 5.2, 5.3 and 6.6.2
Obstruction to discharge pattern of sprinklers 5.3
Valves prEN 12845-1:2021, Clause 17
Pipework and pipe supports prEN 12845-1:2021, Clause 18
Alarms and alarm devices prEN 12845-1:2021, Clause 19
Signs, notices, and information prEN 12845-1:2021, Clause 20
Alarm generation, monitoring and transmission prEN 12845-1:2021, Clause 21
to remote manned station
Water supplies 6.4, prEN 12845-1:2021, 22.1.2, 22.1.3,
22.2, 22.3, 22.4, 22.5
Type of water supply prEN 12845-1:2021, Clause 23
Pumps prEN 12845-1:2021, Clause 24
Commissioning and first inspection prEN 12845-1:2021, Clause 25
Replacement sprinklers prEN 12845-1:2021, Clause 26
Maintenance and inspection prEN 12845-1:2021, Clause 27
5 Installation requirements
5.1 Sprinkler type, spacing, clearance and nominal operating temperature
5.1.1 Sprinkler type
ESFR pendent, dry pendent or upright sprinklers in accordance with EN 12259-13 shall be used. The
design criteria provided in 6.6 are applicable under the condition that the sprinkler has been successfully
tested for the building height, storage height, goods and storage type that are intended.
NOTE The design criteria specified in 6.6 reflects the test results of full-scale fire tests conducted at various fire
test laboratories in line with their test requirements to support various design guidelines. 6.6 therefore contains
information which can seem to overlap or contradict but actually reflects the specific data available.
CMSA pendent, dry pendent or upright sprinklers in accordance to their manufacturer’s specification
shall be used. In dry CMSA systems pendent type sprinkler shall not be used.
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Sprinkler nominal operating temperature and response characteristic are specified in the design tables
in Clause 6.
NOTE Typically ESFR has a nominal operating temperature of 68°C to 74°C and is fast response. CMSA typically
has a nominal operating temperature of 68 °C to 74 °C except for dry systems where it is usually a nominal operating
temperature of 141°C.
5.1.2 Sprinkler installation type
All requirements for wet or dry installations given in prEN 12845-1 shall be followed.
5.1.3 Sprinkler spacing, location and positioning relative to roof and ceilings
5.1.3.1 ESFR sprinkler spacing and location
The minimum distance between two sprinklers shall be 2,4 m. The maximum spacing between two
adjacent sprinklers shall be 3,7 m in building height not exceeding 9,1 m and 3,1 m for building height
2
exceeding 9,1 m. The maximum area per sprinkler shall be 9,3 m . The minimum area per sprinkler shall
2
be 6 m .
5.1.3.2 CMSA sprinkler spacing and location
The minimum distance between two sprinklers shall be 2,4 m. The maximum spacing between two
adjacent sprinklers shall be 3,7 m except for combustible obstructed ceiling construction where it shall
be 3,1 m.
2
The maximum area per sprinkler shall be 12 m for STC 1 where the ceiling corresponds the following:
• unobstructed and non-combustible;
• obstructed and non-combustible;
• unobstructed and combustible.
2
For all other cases it shall be 9,3 m .
2
The minimum area per sprinkler shall be 6 m except for the following cases where the minimum area
2
per sprinkler shall be 7,5 m :
• sprinkler with a k-factor of 160;
• upright standard response sprinkler with any other k-factor;
• pendent standard response sprinkler with any other k factor in a building exce
...
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