EN 12845-2:2024

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.

oSIST prEN 12845-2:2022
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.

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
oSIST prEN 12845-2:2022
prEN 12845-2:2022 (E)
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
oSIST prEN 12845-2:2022
prEN 12845-2:2022 (E)
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 .
...