EN 12845:2004/prA2

SLOVENSKI STANDARD
01-november-2008
Vgrajene naprave za gašenje - Avtomatski sprinklerski sistemi - Projektiranje,
vgradnja in vzdrževanje
Fixed firefighting systems - Automatic sprinkler systems - Design, installation and
maintenance
Ortsfeste Brandbekämpfungsanlagen - Automatische Sprinkleranlagen - Planung,
Installation und Instandhaltung
Installations fixes de lutte contre l'incendie - Systèmes d'extinction automatiques du type
sprinkleur - Calcul, installation et maintenance
Ta slovenski standard je istoveten z: EN 12845:2004/prA2
ICS:
13.220.20 3RåDUQD]DãþLWD Fire protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
FINAL DRAFT
EN 12845:2004
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
August 2008
ICS 13.220.20
English Version
Fixed firefighting systems - Automatic sprinkler systems -
Design, installation and maintenance
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Brandbekämpfungsanlagen - Automatische
d'extinction automatiques du type sprinkleur - Calcul, Sprinkleranlagen - Planung, Installation und Instandhaltung
installation et maintenance
This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee
CEN/TC 191.
This draft amendment A2, if approved, will modify the European Standard EN 12845:2004. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.
This draft amendment 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 Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12845:2004/prA2:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Modification to Clause 3, Terms and definitions.4
2 Modification to Clause 4, Contract planning and documentation .4
3 Modification to 6.2.2, Ordinary Hazard - OH .4
4 Modification to 7.2.3, Intermediate level in-rack sprinklers .4
5 Modification to Clause 8, Water supplies.6
6 Modification to Clause 9, Type of water supply .6
7 Modification to Clause 10, Pumps .6
8 Modification to 11.4.1.1, Type A pre-action installation.8
9 Modification to 12.2, Maximum area of coverage per sprinkler.8
10 Modification to 13.2.3, Velocity .8
11 Modification to 14.9, Corrosion protection of sprinklers .9
12 Modification to Clause 15, Valves.9
13 Modification to Clause 17, Pipework .9
14 Modification to Clause 19, Commissioning and acceptance tests and periodic inspection.9
15 Modification to Annex A, Classification of typical hazards .10
16 Modification to Annex C, Alphabetical listing of stored products and categories.14
17 Modification to Annex D, Zoning of sprinkler installations.18
18 Modification to Annex F, Special requirements for life safety systems .19
19 Modification to Annex G, Protection of Special special hazards .19

Foreword
This document (EN 12845:2004/prA2:2008) 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 Unique Acceptance Procedure.

1 Modification to Clause 3, Terms and definitions
Delete term and definition 3.39.
Replace term and definition 3.40 with the following:
"life safety system
term applied to sprinkler systems forming an integral part of measures required for the protection of life,
especially where evacuating the building depends on the performance of the sprinkler system and sprinklers
are required expressly for life safety purposes".
Replace term and definition 3.43 with the following:
"Maximum Flow Demand Q
max
flow at the point of intersection of the pressure-flow demand characteristic of the most favourable area of
operation and the water supply pressure-flow characteristic with the suction source at its normal level".
Renumber terms 3.39 up to 3.48 due to deletion of term 3.39.
Add a new term and definition 3.49:
"3.49
pressure maintenance pump (jockey pump)
small automatic pumpset used to replenish minor water loss and maintain system pressure".
2 Modification to Clause 4, Contract planning and documentation
Replace the text of 4.3 d) with the following:
"a statement that the estimate is based on the provision of a sprinkler system to this European Standard,
based on available information.".
Replace the text of 4.4.2 k) with the following:
"a statement that the installation has been designed and will be installed in accordance with this European
Standard or giving details of any deviations from its requirements and the reasons why, based on available
information;".
3 Modification to 6.2.2, Ordinary Hazard - OH
Replace the title of Table 1 with the following:
"Maximum storage heights for OH3 protection".
Delete NOTE 2 of Table 1 and replace "NOTE 1" with "NOTE".
4 Modification to 7.2.3, Intermediate level in-rack sprinklers
Replace Table 4 with the following:
"
Storage Maximum permitted storage height Design Area of operation
configuration (see NOTE 1) density (wet or pre-action
m system (see
NOTE 2)
mm/min m²
Category Category Category Category
I II III IV
ST1 Free 5,3 4,1 2,9 1,6 7,5 260
standing or 6,5 5,0 3,5 2,0 10,0
block stacking 7,6 5,9 4,1 2,3 12,5
6,7 4,7 2,7 15,0
7,5 5,2 3,0 17,5
5,7 3,3 20,0 300
6,3 3,6 22,5
6,7 3,8 25,0
7,2 4,1 27,5
4,4 30,0
ST2 Post pallets 4,7 3,4 2,2 1,6 7,5 260
in single rows 5,7 4,2 2,6 2,0 10,0
6,8 5,0 3,2 2,3 12,5
ST4 Palletized 5,6 3,7 2,7 15,0
racks 6,0 4,1 3,0 17,5
4,4 3,3 20,0 300
4,8 3,6 22,5
5,3 3,8 25,0
5,6 4,1 27,5
6,0 4,4 30,0
ST3 Post pallets 4,7 3,4 2,2 1,6 7,5 260
in multiple rows 5,7 4,2 2,6 2,0 10,0
5,0 3,2 2,3 12,5
ST5 and ST6 2,7 15,0
Solid or slatted 3,0 17,5
shelves
NOTE 1 The vertical distance from the floor to the sprinkler deflectors, minus 1 m, or the highest value shown in the
table, whichever is the lower.
NOTE 2 Dry and alternate systems should be avoided on High Hazard storage especially with the more combustible
products (the higher categories) and the higher storage. Should it nonetheless be necessary to install a dry or alternate
system, the area of operation should be increased by 25 %.
".
5 Modification to Clause 8, Water supplies
Replace the first line of 8.5.1 with the following:
"A flow measuring facility shall be installed at each control valve set except in the following cases:".
Add the following paragraph after 8.5.1 b):
"If the flow measuring device is not permanently fitted, it shall be available on site at all times.".
Replace the first line of 8.5.2 with the following:
"At least one suitable flow and pressure measuring facility shall be permanently installed and shall be capable
of checking each water supply.".
Add the following paragraph to the end of 8.5.2:
"If the testing apparatus is not permanently fitted, it shall be available on site at all times.".
Replace the third and fourth sentences of 8.6.2 with the following:
"The flow shall be verified in accordance with Clause 7. The supply pressure measured on the 'C' gauge shall
be verified as being at least the appropriate value specified in Clause 7.".
6 Modification to Clause 9, Type of water supply
Add the following text to the end of 9.3.4 a):
". The failure of a single float valve shall not impair the required infill rate".
Replace the first sentence of 9.5.1 with the following:
"The pressure tank shall be reserved for the sprinkler system and/or the water spray system.".
Replace the first and last list items of 9.6.2 a) with the following: "
 each end shall be capable of satisfying the flow demands of the system;"
and "
 if only one end gives the required pressure, a single booster pump shall be installed. If both ends cannot
give the required pressure, two or more booster pumps shall be installed.".
Replace the third list item of 9.6.2 b) with the following: "
 suitable clean (see 8.1.2) water shall be used;".
7 Modification to Clause 10, Pumps
Replace the first paragraph of 10.5 with the following:
"A stop valve shall be fitted in the pump suction pipe unless the maximum water level is lower than the pump.
A non-return valve and a stop valve shall be fitted in the delivery pipe of each pump.".
Add the following paragraph after the first paragraph in 10.5:
"In the case of booster pumps a by-pass shall be installed around the pumps with a non-return valve and two
stop valves all of the same diameter as the trunk main.".
Replace the second paragraph (now the third paragraph) in 10.5 to read:
o
"Any taper pipe fitted to the pump outlet shall expand in the direction of flow at an angle not exceeding 20 .
Valves on the delivery side shall be fitted after any taper pipe.".
Replace the first paragraph of Clause 10.6.2.1 with the following:
"The pump suction shall be connected to a straight or taper pipe at least two diameters long. The taper pipe
shall have a horizontal top side and a maximum included angle not exceeding 20º.".
Replace the second paragraph of 10.6.2.1 with the following:
"The suction piping, including all valves and fittings, shall be designed in such a way as to ensure that the
available NPSH (calculated at the maximum anticipated water temperature) at the pump inlet exceeds the
required NPSH by at least 1 m at the pump flow as shown in Table 14.".
Replace Table 14 with the following:
"
Pipework Hazard Rated pump flow Pump inlet condition
Class
Pre-calculated LH/OH Pressure and flow requirements For tanks, with water supply
from Table 6 at low water level (see X in
Figure 4).
HH
Pressure and 1,4 × flow required
For booster pumps, with
from Table 7
minimum town main pressure.
Fully calculated All Maximum pressure and flow
required for the most favourable
area
".
Add a new sub-clause 10.6.2.5: "
10.6.2.5 Pressure maintenance pump
A pressure maintenance pump may be installed to avoid starting one of the main pumps unnecessarily or to
maintain the system pressure above control valve sets in the case of water supplies such as town mains with
fluctuating pressure.
NOTE Some water authorities may not allow pressure maintenance pumps on systems with town main connections.
The pressure maintenance pump shall be sized and arranged in such a way that it is not capable of providing
enough flow and pressure for a single open sprinkler and thus of preventing the main pump(s) from starting.
In the case of pressure maintenance pumps installed with negative suction, the suction piping and fittings shall
be independent of those of the main pump(s).".
Replace the last sentence of 10.7.2 with the follwoing:
"In addition the pump shall be capable of supplying 140 % of this flow at a pressure of no less than 70 % of
the pressure at the design pump flow (see Figure 7).".
Delete "(see Figure 7)" from the end of the last sentence of the paragraph of 10.7.3.
Delete the second sentence of 10.7.5.1.
Add the following sentence to the end of Clause 10.7.5.1:
"They shall be connected in such a way that either switch will start the pump.".
Replace "P" with "p" in 10.7.5.2 (three times).
Replace "AC-4" with "AC-3" in 10.8.5.3 to read:
"Contacts shall comply with utilisation category AC-3 of EN 60947-1 and EN 60947-4.".
Replace the text in 10.8.6.2 with the follo
...