oSIST prEN 17450-2:2023

Fixed firefighting systems - Water mist systems - Part 2: Product characteristics and test methods for nozzles

This document specifies product characteristics and test methods of open nozzles and automatic nozzles for use in water mist systems.

Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 2: Anforderungen und Prüfverfahren für Düsen

Dieses Dokument legt Produkteigenschaften und Prüfverfahren für offene Düsen und automatische Düsen für die Verwendung in Wassernebelsystemen fest.

Installations fixes de lutte contre l’incendie - Systèmes à brouillard d’eau - Partie 2 : Caractéristiques de produit et méthodes d’essai pour les diffuseurs

Le présent document spécifie les caractéristiques de produit et les méthodes d’essai des diffuseurs ouverts et des diffuseurs automatiques utilisés dans le cadre de systèmes à brouillard d’eau.

Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 2. del: Zahteve in preskusne metode za šobe

General Information

• Status: Not Published
• Public Enquiry End Date: 12-Jul-2023
• ICS: 13.220.10 - Fire-fighting
• ICS: 13.220.20 - Fire protection
• Technical Committee: POZ - Požarna varnost
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 04-May-2023
• Due Date: 21-Sep-2023
• Completion Date: 02-Aug-2023
• Ref Project: prEN 17450-2 - Fixed firefighting systems - Water mist systems - Part 2: Product characteristics and test methods for nozzles

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17450-2:2023
01-julij-2023
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 2. del: Zahteve in preskusne
metode za šobe
Fixed firefighting systems - Water mist systems - Part 2: Product characteristics and test
methods for nozzles
Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 2: Anforderungen
und Prüfverfahren für Düsen
Installations fixes de lutte contre l’incendie - Systèmes à brouillard d’eau - Partie 2 :
Caractéristiques de produit et méthodes d’essai pour les diffuseurs
Ta slovenski standard je istoveten z: prEN 17450-2
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 17450-2:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17450-2:2023

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oSIST prEN 17450-2:2023


DRAFT
EUROPEAN STANDARD
prEN 17450-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

April 2023
ICS
English Version

Fixed firefighting systems - Water mist systems - Part 2:
Product characteristics and test methods for nozzles
 Ortsfeste Brandbekämpfungsanlagen -
Wassernebelsysteme - Teil 2: Anforderungen und
Prüfverfahren für Düsen
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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17450-2:2023 E
worldwide for CEN national Members.

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prEN 17450-2:2023 (E)
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Product characteristics . 7
4.1 General. 7
4.2 Nominal operating temperature for automatic nozzles . 8
4.3 Thermal response of automatic nozzles . 8
4.4 K-factor . 8
4.5 Function of nozzles . 8
4.5.1 Automatic nozzles . 8
4.5.2 Open nozzles . 9
4.6 Strength of nozzle body and deflector . 9
4.6.1 Mechanical strength test . 9
4.6.2 Hydrostatic strength test . 9
4.6.3 Strength of nozzle deflector and its supporting or moving parts . 9
4.7 Strength of release element of automatic nozzles . 9
4.7.1 General. 9
4.7.2 Automatic nozzles using glass-bulbs . 9
4.7.3 Automatic nozzles using fusible links . 9
4.8 Leak resistance . 9
4.9 Heat exposure for automatic nozzles . 9
4.10 Resistance against thermal shock for automatic nozzles. 9
4.11 Resistance against corrosion . 10
4.11.1 Stress corrosion for nozzles with brass parts . 10
4.11.2 Sulphur dioxide corrosion . 10
4.11.3 Salt mist corrosion . 10
4.11.4 Moist air exposure . 10
4.12 Aging test (by heat exposure) for automatic nozzles (optional) . 11
4.13 Resistance against water hammer for automatic nozzles. 11
4.14 Resistance to heat . 11
4.15 Resistance to low temperature for automatic nozzles (optional). 11
4.16 Resistance to vibration . 11
4.17 Resistance to impact . 11
5 Testing, assessment and sampling methods . 11
5.1 General. 11
5.2 Operational tests . 12
5.2.1 Comparison of fire test nozzles with the one used for component testing . 12
5.2.2 Operating temperature of automatic nozzles . 12
5.3 Thermal response tests . 12
5.4 Water flow test . 12
5.5 Function test of nozzles . 12
5.5.1 Function of release element for automatic nozzles . 12
5.5.2 Functional test for open nozzles with blow-off caps . 13
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5.5.3 Verification functional test . 13
5.6 Strength of nozzle body and deflector tests . 14
5.6.1 Mechanical strength test . 14
5.6.2 Hydrostatic strength test . 14
5.6.3 Strength of nozzle deflector and its supporting or moving parts test . 14
5.7 Strength of release elements test for automatic nozzles . 14
5.7.1 General . 14
5.7.2 Automatic nozzles using glass bulbs . 15
5.7.3 Automatic nozzles using fusible links . 15
5.8 Leak resistance test . 15
5.9 Heat exposure for automatic nozzles . 15
5.10 Thermal shock test . 16
5.11 Corrosion tests . 16
5.11.1 Stress corrosion . 16
5.11.2 Sulphur dioxide corrosion. 16
5.11.3 Salt mist corrosion . 16
5.11.4 Moist air exposure . 16
5.12 Aging test (by heat exposure) for automatic nozzles (optional) . 17
5.13 Water hammer test . 17
5.14 Heat-resistance test . 18
5.15 Low temperature resistance test for automatic nozzles (optional) . 18
5.16 Vibration test . 18
5.17 Resistance to impact test . 19
6 Documentation and marking . 20
6.1 Product documentation . 20
6.2 Marking . 20
7 Test facilities . 21
7.1 Test facility . 21
7.2 Test report . 21
Annex A (normative) Test apparatus for water flow test . 22
A.1 Single inlet pipe nozzle . 22
A.2 Calculation . 22
Annex B (informative) Water distribution test. 24
B.1 Apparatus . 24
B.2 Procedure . 24
Annex C (normative) Corrosion tests . 26
C.1 Stress corrosion test for brass nozzles . 26
C.1.1 Reagents . 26
C.1.2 Apparatus . 26
C.1.3 Procedure . 26
C.2 Post exposure flowing test (if required) . 26
C.2.1 Automatic nozzles . 26
C.2.2 Open nozzles . 26
C.3 Sulphur dioxide corrosion test . 26
C.3.1 General . 26
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C.3.2 Reagents . 27
C.3.3 Apparatus . 27
C.3.4 Procedure . 27
C.3.4.1 General. 27
C.3.4.2 Automatic nozzles . 27
C.3.4.3 Open nozzles . 27
C.4 Salt mist corrosion test . 28
C.4.1 Reagents . 28
C.4.2 Apparatus . 28
C.4.3 Procedure . 29
C.5 Moist air atmosphere test . 29
Annex D (normative) Thermal response tests . 30
D.1 Test setup. 30
D.2 Prolonged exposure ramp test . 30
D.3 Plunge test . 31
Annex E (normative) Strength of water mist body and deflector tests . 33
E.1 Body . 33
E.1.1 Mechanical strength test . 33
E.1.2 Hydrostatic strength test . 35
Annex F (normative) Test to determine operating temperatures . 36
F.1 Apparatus . 36
F.2 Procedure . 36
Bibliography . 38
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oSIST prEN 17450-2:2023
prEN 17450-2:2023 (E)
European foreword
This document (prEN 17450-2:2023) 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.
EN 17450, Fixed firefighting systems — Water mist systems, consists of the following parts:
— Part 1: Product characteristics and test methods for strainer and filter components
— Part 2: Product characteristics and test methods for nozzles
1
— Part 3: Product characteristics and test methods for check valves
— Part 4: Product characteristics and test methods for control deluge valves and actuators
1
— Part 5: Product characteristics and test methods for pressure switches

1
Document planned.
5

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oSIST prEN 17450-2:2023
prEN 17450-2:2023 (E)
1 Scope
This document specifies product characteristics and test methods of open nozzles and automatic nozzles
for use in water mist systems.
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 12259-1, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 1:
Sprinklers
EN 60751, Industrial platinum resistance thermometers and platinum temperature sensors (IEC 60751)
EN 14972 (all parts), Fixed firefighting systems — Water mist systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14972-1 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
nozzle filter element
element that collects the particles
EXAMPLE A mesh.
3.2
nominal cross section (size)
calculated cross section on basis of the nominal diameter
3.3
pressure loss
differential pressure between inlet and outlet of the filter
3.4
operating pressure
constant or time-dependent pressure at a nozzle during discharge
3.5
stand-by pressure
pressure in the pipework at a closed automatic nozzle, prior to the activation of the nozzle
Note 1 to entry: This can be static pressure or flowing pressure.
Note 2 to entry: This can be higher or lower than the operating pressure.
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3.6
maximum stand-by pressure
highest pressure to which the installed nozzle is exposed, due to the effects of the pressure maintenance
device and head of water
Note 1 to entry: Specified by the manufacturer.
3.7
minimum stand-by pressure
lowest pressure to which the installed nozzle is exposed, due to the effects of the pressure maintenance
device and head of water
Note 1 to entry: Specified by the manufacturer.
3.8
fire protocol test pressure
lowest pressure used in the fire test measured on the hydraulically most unfavourable nozzle
Note 1 to entry: Specified by the manufacturer.
3.9
maximum operating pressure
highest pressure at the nozzle inlet while operating
Note 1 to entry: Specified by the manufacturer.
3.10
minimum operating pressure
lowest pressure at the nozzle inlet while operating
Note 1 to entry: Specified by the manufacturer.
3.11
release element
part of a nozzle which activates the discharge of the nozzle after thermal or other activation method
4 Product characteristics
4.1 General
The nozzles used in water mist fire protection systems shall be representative of production nozzles and
shall pass all of the applicable requirements specified in this document.
All nozzles with orifice diameters less than 2,5 mm shall be equipped with a nozzle filter. The size of the
nozzle filter element shall be at least 1,5 times the nominal cross section area of the sum of the orifices
behind the filter itself. The filter shall not have a bigger mesh size, i.e. grade of filtration, than 80 % of the
smallest nozzle orifice diameter behind the filter itself.
Nozzle types tested in accordance with this document shall be the same as those that have successfully
passed the fire tests according to the relevant part of the EN 14972 series.
The nozzles shall be compared according to 5.2.1.
As an optional test the water distribution can be tested according to Annex B.
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4.2 Nominal operating temperature for automatic nozzles
The nominal operating temperatures of automatic nozzles are given in Table 1. Automatic nozzles shall
be colour coded according to Table 1.
The nominal operating temperature shall be according to 5.2.2.
Table 1 — Nominal operating temperatures and colour codes
Glass bulbs Fusible links
Nominal operating Liquid colour Nominal operating temperature Yoke arms colour
temperature code within range code
°C  °C
57 orange 57 to 77 uncoloured
68 red 80 to 107 white
79 yellow 121 to 149 blue
93 green 163 to 191 red
100 green 204 to 246 green
121 blue 260 to 302 orange
141 blue 320 to 343 black
163 mauve – –
182 mauve – –
204 black – –
227 black – –
260 black – –
286 black – –
343 black – –
4.3 Thermal response of automatic nozzles
The RTI value shall be verified with tests according to 5.3. In the most unfavourable orientation the
average RTI values shall not exceed 250 % of the average RTI values in the standard orientation.
4.4 K-factor
All K-factors shall vary less than ±5 % from manufacturer specifications when tested in accordance with
5.4.
4.5 Function of nozzles
4.5.1 Automatic nozzles
For automatic nozzles, when tested in accordance with 5.5.1, the water mist nozzle shall open and within
5 s of release of the release element shall operate as intended. Any lodgement of released parts shall be
cleared within 60 s of the release of the release element.
For nozzles with deflectors or separate/moving parts for the development of a spray, when tested in
accordance with 5.5.1, the deflector and its supporting parts shall operate as intended.
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4.5.2 Open nozzles
For open nozzles with blow-off caps, when tested in accordance with 5.5.2, the cap shall fully release
within 5 s and not impede the discharge at any time.
4.6 Strength of nozzle body and deflector
4.6.1 Mechanical strength test
When tested in accordance with 5.6.1, the water mist nozzle body shall not show permanent elongation
of more than 0,2 % in relation to the distance between the load bearing parts at the end of the test.
If the testing of this requirement is not applicable due to the design of the nozzle, the nozzle shall be
pressure tested according to 4.6.2.
4.6.2 Hydrostatic strength test
When tested in accordance with 5.6.2, the water mist nozzle body shall not show leakage or permanent
elongation of more than 0,2 % in relation to the distance between the load bearing parts at the end of the
test.
4.6.3 Strength of nozzle deflector and its supporting or moving parts
For nozzles with deflectors (or other protruding parts which impinge upon the water discharge and alter
the spray pattern, or moving parts regardless of their position), when tested in accordance with 5.6.3, the
water mist nozzle deflector and its supporting or moving parts shall not be damaged or deformed and
shall remain intact.
4.7 Strength of release element of automatic nozzles
4.7.1 General
The testing of release elements shall be done as described in 4.7.2 and 4.7.3.
4.7.2 Automatic nozzles using glass-bulbs
The design lower tolerance limit of bulb strength according to EN 12259-1 (0,99 confidence for 99 % of
samples) shall be greater than twice the design upper tolerance limit of the bulb/nozzle assembly load
including the highest calculated water pressure on nozzle. Nozzles shall be tested and comply with the
requirements described in 5.7.2.
4.7.3 Automatic nozzles using fusible links
For each design, fusible heat-responsive elements in the lowest temperature rating shall demonstrate
their ability to sustain the design load when tested in accordance with 5.7.3.
4.8 Leak resistance
When tested in accordance with 5.8, nozzles shall show no sign of leakage. In addition nozzles shall
function as intended when tested in accordance with 5.5.3.
4.9 Heat exposure for automatic nozzles
There shall be no damage to the glass bulb when automatic nozzles are tested in accordance with 5.9.
4.10 Resistance against thermal shock for automatic nozzles
For automatic glass bulb water mist nozzles, when tested in accordance with 5.10, the glass bulbs shall
remain intact after being cooled in the water bath. The nozzles shall meet the requirements of 4.5 after
being cooled in the water bath.
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4.11 Resistance against corrosion
4.11.1 Stress corrosion for nozzles with brass parts
Nozzles shall be tested in accordance with 5.11.1.1.
After exposure the nozzles shall show no evidence of cracks, delamination or failure of an operating part.
In the case that any nozzles show evidence of cracking, delamination or failure of an operating part:
— Automatic nozzles shall show no visible evidence of leakage when subjected to the leak resistance
test described in 5.8. The nozzles shall operate in such a way that the waterway is cleared; any
lodgements shall be ignored, when subjected to a function test in accordance with 5.5.3. The nozzle
...