Fixed firefighting systems - Water mist systems - Part 3: Test protocol for office, school classrooms and hotel for automatic nozzle systems

This document specifies the evaluation of the fire performance of water mist systems for offices, schools class rooms and hotels. This document test protocol is applicable to ceiling mounted automatic nozzles to be used in unlimited volume. This document is applicable for horizontal, solid, flat ceilings with heights of 2 m and above, up to the maximum ceiling height tested.

Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-Löschanlagen - Teil 3: Prüfprotokoll für Büros, Schulen und Hotels für automatische Düsensysteme

Dieses Dokument legt die Beurteilung des Verhaltens von Feinsprüh Löschanlagen für Büros, Schulklassenräume und Hotels bei Brandeinwirkung fest. Das Prüfprotokoll nach diesem Dokument ist anwendbar für deckenmontierte automatische Düsen zur Verwendung ohne Volumenbegrenzung. Dieses Dokument ist anwendbar für waagerechte, massive, ebene Decken von 2 m Höhe und darüber bis zur höchsten geprüften Deckenhöhe.

Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 3 : Protocole d'essai des systèmes à buses automatiques pour bureaux, écoles et hôtels

Le présent document spécifie l'évaluation de la performance au feu des systèmes à brouillard d'eau pour les bureaux, les écoles et les hôtels. Le protocole d'essai du présent document est applicable aux buses automatiques montées sous plafond à utiliser dans des volumes illimités. Le présent document est applicable à des plafonds plans, horizontaux et pleins de hauteur supérieure ou égale à 2 m, jusqu'à la hauteur maximale de plafond soumise à l'essai.

Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 3. del: Protokol preskušanja sistemov z avtomatskimi šobami za požarno zaščito pisarn, šolskih učilnic in hotelov

General Information

Status
Published
Public Enquiry End Date
04-Sep-2019
Publication Date
19-Aug-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Aug-2021
Due Date
16-Oct-2021
Completion Date
20-Aug-2021

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SLOVENSKI STANDARD
SIST EN 14972-3:2021
01-oktober-2021
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 3. del: Protokol preskušanja
sistemov z avtomatskimi šobami za požarno zaščito pisarn, šolskih učilnic in
hotelov

Fixed firefighting systems - Water mist systems - Part 3: Test protocol for office, school

classrooms and hotel for automatic nozzle systems

Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-Löschanlagen - Teil 3: Prüfprotokoll für

Büros, Schulen und Hotels für automatische Düsensysteme

Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 3 :

Protocole d'essai des systèmes à buses automatiques pour bureaux, écoles et hôtels

Ta slovenski standard je istoveten z: EN 14972-3:2021
ICS:
13.220.10 Gašenje požara Fire-fighting
SIST EN 14972-3:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14972-3:2021
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SIST EN 14972-3:2021
EN 14972-3
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2021
EUROPÄISCHE NORM
ICS 13.220.20
English Version
Fixed firefighting systems - Water mist systems - Part 3:
Test protocol for office, school classrooms and hotel for
automatic nozzle systems

Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-

à brouillard d'eau - Partie 3 : Protocole d'essai des Löschanlagen - Teil 3: Prüfprotokoll für Büros, Schulen

systèmes à buses automatiques pour bureaux, écoles et und Hotels für automatische Düsensysteme

hôtels
This European Standard was approved by CEN on 12 March 2021.

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, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14972-3:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 General requirements ................................................................................................................................... 6

5 Fuel packages ................................................................................................................................................... 7

5.1 General ................................................................................................................................................................ 7

5.2 Office fuel package .......................................................................................................................................... 7

5.2.1 General ................................................................................................................................................................ 7

5.2.2 Padded chair ..................................................................................................................................................... 9

5.2.3 Wooden drawer ............................................................................................................................................ 10

5.2.4 Items on the table ......................................................................................................................................... 10

5.2.5 Walls ................................................................................................................................................................. 11

5.2.6 Ignition source .............................................................................................................................................. 11

5.3 Hotel and accommodation fuel package .............................................................................................. 12

5.3.1 General ............................................................................................................................................................. 12

5.3.2 Metal frames .................................................................................................................................................. 13

5.3.3 Mattresses ....................................................................................................................................................... 16

5.3.4 Ignition source .............................................................................................................................................. 16

6 Test arrangement ......................................................................................................................................... 17

6.1 Reference sprinkler requirements ........................................................................................................ 17

6.1.1 General ............................................................................................................................................................. 17

6.1.2 Reference sprinkler tests .......................................................................................................................... 18

6.2 Water mist system requirements ........................................................................................................... 18

6.3 Sprinkler grid for office fuel package ................................................................................................... 18

6.4 Sprinkler grid for hotel and accommodation fuel package .......................................................... 19

7 Test equipment requirements ................................................................................................................ 20

8 Instrumentation requirements ............................................................................................................... 21

8.1 General ............................................................................................................................................................. 21

8.2 Temperature .................................................................................................................................................. 21

8.3 Pressure ........................................................................................................................................................... 21

8.4 Time .................................................................................................................................................................. 21

9 Test criteria .................................................................................................................................................... 22

9.1 General ............................................................................................................................................................. 22

9.2 Fire tests .......................................................................................................................................................... 22

9.3 Evaluation of test results ........................................................................................................................... 23

9.3.1 Office fuel package ....................................................................................................................................... 23

9.3.2 Hotel and accommodation fuel package .............................................................................................. 24

10 Test report ...................................................................................................................................................... 25

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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
European foreword

This document (EN 14972-3:2021) 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 February 2022, and conflicting national standards

shall be withdrawn at the latest by February 2022.

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.

EN 14972, Fixed firefighting systems — Water mist systems, consists of the following parts:

— Part 1: Design, installation, inspection and maintenance
— Part 2: Test protocol for shopping areas for automatic nozzle systems

— Part 3: Test protocol for office, school class rooms and hotel for automatic nozzle systems

— Part 4: Test protocol for non-storage occupancies for automatic nozzle systems
— Part 5: Test protocol for car garages for automatic nozzle systems

— Part 6: Test protocol for false floors and false ceilings for automatic nozzle systems

— Part 7: Test protocol for commercial low hazard occupancies for automatic nozzle systems

— Part 8: Test protocol for machinery in enclosures exceeding 260 m for open nozzle systems

— Part 9: Test protocol for machinery in enclosures not exceeding 260 m for open nozzle systems

— Part 10: Test protocol for atrium protection with sidewall nozzles for open nozzle systems

— Part 11: Test protocol for cable tunnels for open nozzle systems

— Part 12: Test protocol for commercial deep fat cooking fryers for open nozzle systems

— Part 13: Test protocol for wet benches and other similar processing equipment for open nozzle systems

for open nozzle systems
— Part 14: Test protocol for combustion turbines in enclosures exceeding 260 m

— Part 15: Test protocol for combustion turbines in enclosures not exceeding 260 m for open nozzle

systems
— Part 16: Test protocol for industrial oil cookers for open nozzle systems

— Part 17: Test protocol for residential occupancies for automatic nozzle systems

NOTE This list includes standards that are in preparation and other standards may be added. For current

status of published standards refer to www.cen.eu.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)

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, Turkey and the

United Kingdom.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
1 Scope

This document specifies the evaluation of the fire performance of water mist systems for offices, school

classrooms and hotels. This fire test protocol is applicable to ceiling mounted automatic nozzles to be

used in unlimited volume. This document is applicable for horizontal, solid, flat ceilings with heights of

2 m and above, up to the maximum tested ceiling height.
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 12845, Fixed firefighting systems — Automatic sprinkler systems — Design, installation and

maintenance

EN 14972-1:2020, Fixed firefighting systems — Water mist systems — Part 1: Design, installation,

inspection and maintenance

ISO 5660-1, Reaction-to-fire tests — Heat release, smoke production and mass loss rate — Part 1: Heat

release rate (cone calorimeter method) and smoke production rate (dynamic measurement)

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 14972-1:2020 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
office and school spaces

areas considered to be covered by the office and school fuel package in accordance with 5.2, including:

— cellular offices and open plan offices;
— areas with counters;
— restaurants and kitchens;
— public areas in buildings with low fire load;
— escape routes or other corridors;
— training classrooms;
— churches;
— museums;
— as well as further comparable risks.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
3.2
hotel and accommodation spaces

areas considered to be covered by the hotel and accommodation spaces fuel package in accordance to

5.3, including:
— hotel rooms;
— rooms in hospitals, nursing homes, senior citizens residences;
— flats;
— recreation areas.
4 General requirements

4.1 Up to a maximum of 5 nozzles used in the fire tests shall be kept for later verification.

4.2 The water mist system, operating without manual intervention, shall successfully complete all

described performance fire tests for their specific applications. For the applications “office and school

spaces” in accordance with 3.1, the fuel package in accordance with 5.2 shall be applied. For the

applications “hotel and accommodation spaces” in accordance with 3.2, fuel packages in accordance

with 5.3 shall be applied.

4.3 The fire load shall be taken from the conditioning area and arranged into the test area just before

conducting the test.

4.4 For the “Office fuel package” in accordance with 5.2, the water flow shall be shut off 30 min after

the activation of the first sprinkler/automatic nozzle in the fire test. Any remaining fire shall be

manually extinguished and the fire damage shall be recorded.

4.5 For the “Hotel and Accommodation fuel package” in accordance with 5.3, the water flow shall be

shut off 10 min after the activation of the first sprinkler/automatic nozzle in the fire test. Any remaining

fire shall be manually extinguished and the fire damage shall be recorded.

4.6 Prior to the testing, a layout of the water mist system to be tested shall be submitted for test

preparation purposes. This layout shall include any components required for the testing as well as the

full dimensioning (e.g. length of pipes, distances of automatic nozzles/sprinklers, etc.).

4.7 System components, component locations, operating conditions and test enclosure details shall

remain unaltered throughout all of the fire tests for a given application.

4.8 All fire tests shall be conducted using the manufacturer instructions in regards to automatic

nozzle placement, spray flux, and operating pressure. Sprays shall not be intermittent.

4.9 The test protocol is only applicable to ceiling mounted automatic nozzles.

4.10 The water supply shall be capable of supplying a flow rate and pressure at the minimum

operating pressure and flow rate of the automatic nozzle as specified by the manufacturer. These

parameters shall be met based on the actual layout of the pipework installation as used in the test

scenario.

4.11 The tests with the water mist system shall be conducted at maximum ceiling height, maximum

spacing and minimum discharge conditions regarding water flow and pressure as specified by the

manufacturer for this application. The system shall be installed to achieve the maximum allowed time

delay of water pressure build-up of the system.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
5 Fuel packages
5.1 General

The test assembly for all fire tests shall comply with the following specifications and corresponding

figures.

The reference testing with a prescribed sprinkler system serves to indicate the baseline performance at

each different test facility and set-up. Within one test series, all fuel packages shall be identical.

The fire loads provided for the tests shall have humidity content as obtained by storage indoors at

(20 ± 5) °C for two weeks.

In case of storing fire loads in conditioned environment at a temperature of (23 ± 2) °C and a relative

humidity of (50 ± 5) %, conditioning time may be reduced to minimum of 48h.

The wood crib shall be conditioned before the test, such that the moisture content is (10 ± 2) %, 3 mm

below the wood stick surface.

The storing conditions shall be the same for all fire loads used during all tests.

5.2 Office fuel package
5.2.1 General
The fuel package consists of the following elements:
— two table plates;
— a padded wooden-frame chair;
— a wooden drawer under one table;
— files and books on the table;
— plywood walls surrounding the tables;
— a gas burner and a wood crib for ignition.
The typical masses of the individual components shall be as listed in Table 1.
The tolerance of all dimensions is ± 5 %.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Table 1 — Office fire load
Combustible material Item Typical mass
Table plates 56
Wall panel 30
Wood
Drawer 15
Chair (frame) 6
Filed paper 90
Paper Books 5
Newspaper 1
Chair (padding) 1
Polyether foam
Simulated files 1

A photograph of a typical fuel package is shown in Figure 1. Below, each element is described in more

detail.
Figure 1 — Overview of the office fuel package

The tables shall be constructed out of two plain uncoated 22 mm thick chipboard plates, one with the

measurements 304 cm × 76 cm × 76 cm and the other 152 cm × 108 cm × 76 cm, as given in Figure 2.

Also shown in Figure 2 are the stands to which the table tops shall be attached by screws, and the

position of the wooden drawer, which also serves to support the table tops.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Dimensions in centimetres
Key
1 wooden supports
2 metal frame
Figure 2 — Schematic presentation of the table construction
5.2.2 Padded chair

The padded wooden chair shall be constructed of a plain wooden chair by attaching a 40 cm × 100 cm

piece of cotton-covered polyether foam mattress with screws and washers to it. The front edge of the

chair shall be positioned flush with the edge of Table Nr. 1, and there shall be a 20 cm gap between the

chair and Table Nr. 2.
The polyether foam shall be as follows:

The mattresses shall be made of non-fire retardant polyether and they shall have a density of

approximately 33 kg/m . When tested in accordance with ISO 5660-1, the polyether foam shall give

results as given in Table 2.
The cover shall fulfil the following requirements:
— material: non fire retardant cotton;
2 2
— surface weight: 140 g/m to 180 g/m .
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Table 2 — Cone calorimeter test for foam in accordance with ISO 5660-1
Test conditions — Irradiance: 35 kW/m
— Horizontal Position
— Sample thickness: 50 mm
— No frame retainer shall be used
Test results — Time to ignition: 2 s to 6 s
— 3 min average Heat release rate HRR, q : (270 ± 50) kW/m
180
— Effective heat of combustion: (28 ± 3) MJ/kg
— Total heat release: (50 ± 12) MJ/m
5.2.3 Wooden drawer

The drawer shall be made of 20 mm thick veneered chipboard, and have the approximate measures of

40 cm × 42 cm × 58 cm and an approximate weight of 14,6 kg. Steel supports shall be mounted to the

bottom of the drawer to give the required height. The drawers shall be attached centrally and 20 cm

away from the end of the large table with four screws going through the top of the table top.

The bottommost drawer shall be opened to provide a gap of 4 cm between the front of this tray and the

front of the drawer.
5.2.4 Items on the table

The combustible material on the table shall consist of paper packed in cardboard files, books and

simulated plastic files. The items shall be arranged on the table as shown in Figure 3. The simulated

plastic files shall have a size of 30 cm × 30 cm × 10 cm, made out of the same polyether foam as

specified for the mattress of the chair. A newspaper with an approximately weight of 900 g shall be

placed above the ignition source.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Dimensions in centimetres
Key
1 3 file folders stacked horizontally paper files, 3 kg (horizontal)
2 folders flush to the edge of the table paper files, 2 kg (vertical)
3 separating wall simulated files
4 chair newspapers, 0,9 kg
5 separating wall book
paper files, 3 kg (vertical)
Figure 3 — Layout of the combustible items on the table
5.2.5 Walls

The plywood walls shall stand on the floor and be made of 4 mm thick uncoated plywood panels

measuring 125 cm × 180 cm. Each wall shall extend 250 cm from the corner, and a 10 cm air gap shall

be left between the table plate and the wall. The plywood panels shall be attached to solid non-

combustible plates, measuring 125 cm × 180 cm.
5.2.6 Ignition source

The ignition shall be accomplished by a gas burner and a wood crib. The heat release rate of the burner

shall be 30 kW. The gas burner shall be placed in the centre under the drawer in accordance with

Figure 4. The wood crib shall be made of 16 wood (spruce or fir) sticks measuring

30 cm × 30 cm × 25 cm and arranged in four layers of alternating orientation inside a square steel pan

of 30 cm × 30 cm × 10 cm. 250 ml of heptane shall be poured into the pan to ensure the ignition of the

crib. The pan and crib shall be placed on the floor between the drawer and the wall, with the pan edge

flush to the drawer edge. Figure 4 shows exemplarily the ignition arrangement.
---------------------- Page: 13 ----------------------
SIST EN 14972-3:2021
EN 14972-3:2021 (E)

The fire shall be ignited by applying a flame over the gas burner and switching on the gas flow. The

burner shall be operated for 300 s, independent of a sprinkler or automatic nozzle activation.

Figure 4 — Positioning of the gas burner and the wood crib with respect to the drawer

5.3 Hotel and accommodation fuel package
5.3.1 General
The test assembly shall comply with the following specifications and figures.
The test assembly shall include the following elements:
— metal frames;
— mattresses.

Figure 5 shows an example of the test assembly in accordance with the requirements specified in 5.3.2

to 5.3.4.
All tests shall be carried out with identical test assemblies.
---------------------- Page: 14 ----------------------
SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Dimensions in millimetres
Key
1 sofa number 1 4 sofa number 4
2 sofa number 2 5 ignition source
3 sofa number 3
Figure 5 — Assembly of fire loads and position of ignition source
5.3.2 Metal frames
Four metal frames in accordance with Figure 6 and Figure 7 shall be provided.

The fire source shall consist of four sofas made of mattresses as specified in 5.3.3 installed in steel

frame sofas.
---------------------- Page: 15 ----------------------
SIST EN 14972-3:2021
EN 14972-3:2021 (E)

The steel frames for the sofas shall consist of rectangular bottom and backrest frames constructed of

(25 ± 2) mm square iron of normally 2 mm thickness. The dimensions of the bottom frame shall be

2 000 mm × 700 mm and the dimensions of the backrest frame shall be 2 000 mm × 725 mm. The seat

and backrest mattresses shall be supported on each frame by three vertical and one horizontal steel

bars, constructed from similar steel stock. The vertical steel bars shall be spaced every 500 mm and

welded to the inner long sides of the frame. The horizontal steel bar shall be welded to the inner short

sides of the frame. Both steel frames shall be fitted with a 150 mm by 150 mm steel plate, 2 mm thick.

The steel plate shall be positioned directly under and behind the intended position of the igniter, in

order to prevent it from falling to the floor during a test. Each sofa should have a rectangular armrest on

each end. The armrest shall be constructed of similar steel stock and shall have a length of 600 mm in

length and height of 300 mm. The front section of the armrest shall be attached to the bottom frame

70 mm away from the backrest frame. The assembled frames shall be supported by four legs

constructed of similar steel stock. The two rear legs shall be 205 mm in height and the front legs shall be

270 mm in height. When installed, the mattress forming the seat shall be installed first, with its long

side edge close up against the backrest frame. The mattress forming the backrest shall be installed

thereafter. This mattress shall be kept in upright position by four hooks, two on the short sides and two

on the long sides of the backrest frame (see Figure 7).

The hooks shall be constructed from nominally 50 mm flat iron bars, of nominally 2 mm thickness. The

sofas shall be positioned as shown in Figure 6, with the top of the backrests spaced 25 mm apart.

Dimensions in millimetres
Key
1 sofa number 1
2 sofa number 2
Figure 6 — Assembly of fire loads and metal frames (side view)
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Dimensions in millimetres
Key
1 150 mm × 150 mm steel plate
a) back support b) back support (side view)
c) bottom frame d) armrest (two pieces)
e) assembled sofa (front view) f) assembled sofa (side view)
Figure 7 — Assembly of metal frames
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
5.3.3 Mattresses
The mattresses used in the tests shall fulfil the following requirements:
— dimensions: 2,0 m × 0,8 m × 0,1 m;

— the mattresses shall be made of non-fire retardant polyether and they shall have a density of

approximately 33 kg/m . When tested in accordance with ISO 5660-1, the polyether foam shall give

results as given in Table 3.
Table 3 — Cone calorimeter test for foam in accordance with ISO 5660-1
Test conditions — Irradiance: 35 kW/m
— Horizontal Position
— Sample thickness: 50 mm
— No frame retainer shall be used
Test results — Time to ignition: 2 s to 6 s
— 3 min average Heat release rate HRR, q : (270 ± 50) kW/m
180
— Effective heat of combustion: (28 ± 3) MJ/kg
— Total heat release: (50 ± 12) MJ/m
— Mattress cover:
— material: non fire retardant cotton;
2 2
— surface weight: 140 g/m to 180 g/m .

The test assembly (metal frames and mattresses) is shown exemplarily in Figure 6.

5.3.4 Ignition source

The ignition source is a unit made of fibreboard soaked in heptane in a closed plastic bag. The ignition

source is exemplarily shown in Figure 8.
The ignition source shall fulfil the following requirements:
— material: fibreboard;
— dimensions of the fibreboard: 60 mm × 60 mm × 75 mm;
— quantity of heptane: 120 ml;
— plastic bag in appropriate size.
After filling in the heptane the plastic bag shall be closed immediately.
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SIST EN 14972-3:2021
EN 14972-3:2021 (E)
Figure 8 — Ignition source (example)
Figure 9 shows an example of the test assembly. The position of the
...

SLOVENSKI STANDARD
oSIST prEN 14972-3:2019
01-september-2019
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 3. del: Protokol preskušanja
sistemov z avtomatskimi šobami za požarno zaščito pisarn, šol in hotelov

Fixed firefighting systems - Water mist systems - Part 3: Test protocol for office, school

and hotel for automatic nozzle systems

Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-Löschanlagen - Teil 3: Prüfprotokoll

für Büros, Schulen und Hotels für automatische Düsensysteme

Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 3 :

Protocole d'essai des systèmes à buses automatiques pour bureaux, écoles et hôtels

Ta slovenski standard je istoveten z: prEN 14972-3
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 14972-3:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 14972-3:2019
---------------------- Page: 2 ----------------------
oSIST prEN 14972-3:2019
DRAFT
EUROPEAN STANDARD
prEN 14972-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 13.220.20
English Version
Fixed firefighting systems - Water mist systems - Part 3:
Test protocol for office, school and hotel for automatic
nozzle systems
Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-
Löschanlagen - Teil 3: Prüfprotokoll für Büros, Schulen
und Hotels für automatische Düsensysteme

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey 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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14972-3:2019 E

worldwide for CEN national Members.
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Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 General requirements ................................................................................................................................... 6

5 Fuel packages ................................................................................................................................................... 7

5.1 General ................................................................................................................................................................ 7

5.2 Office fuel package .......................................................................................................................................... 7

5.2.1 General ................................................................................................................................................................ 7

5.2.2 Padded chair ..................................................................................................................................................... 9

5.2.3 Wooden drawer ............................................................................................................................................ 10

5.2.4 Items on the table ......................................................................................................................................... 10

5.2.5 Walls ................................................................................................................................................................. 11

5.2.6 The ignition source ...................................................................................................................................... 11

5.3 Hotel and school fuel package ................................................................................................................. 12

5.3.1 General ............................................................................................................................................................. 12

5.3.2 Metal frames .................................................................................................................................................. 13

5.3.3 Mattresses ....................................................................................................................................................... 16

5.3.4 The ignition source ...................................................................................................................................... 16

6 Test arrangement ......................................................................................................................................... 17

6.1 Reference sprinkler requirements ........................................................................................................ 17

6.1.1 General ............................................................................................................................................................. 17

6.1.2 Reference sprinkler tests .......................................................................................................................... 18

6.2 Water mist system requirements ........................................................................................................... 18

6.3 Sprinkler grid for office fuel package ................................................................................................... 18

6.4 Sprinkler grid for hotel and school fuel package ............................................................................. 19

7 Test equipment requirements ................................................................................................................ 20

8 Instrumentation requirements ............................................................................................................... 21

8.1 General ............................................................................................................................................................. 21

8.2 Temperature .................................................................................................................................................. 21

8.3 Pressure ........................................................................................................................................................... 21

8.4 Time .................................................................................................................................................................. 21

9 Testing criteria .............................................................................................................................................. 22

9.1 General ............................................................................................................................................................. 22

9.2 Fire tests .......................................................................................................................................................... 22

9.3 Evaluation of test results ........................................................................................................................... 23

9.3.1 Office fuel package ....................................................................................................................................... 23

9.3.2 Hotel and school fuel package ................................................................................................................. 24

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European foreword

This document (prEN 14972-3:2019) 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 14972, Fixed firefighting systems — Water mist systems, consists of the following parts:

— Part 1: Design, installation, inspection and maintenance
— Part 2: Test protocol for shopping areas for automatic nozzle systems

— Part 3: Test protocol for office, school class rooms and hotel for automatic nozzle systems

— Part 4: Test protocol for non-storage occupancies for automatic nozzle systems
— Part 5: Test protocol for car garages for automatic nozzle systems

— Part 6: Test protocol for false floors and false ceilings for automatic nozzle systems

— Part 7: Test protocol for commercial low hazard occupancies for automatic nozzle systems

3 3)

— Part 8: Test protocol for machinery in enclosures exceeding 260 m for open nozzle systems

3 4)

— Part 9: Test protocol for machinery in enclosures not exceeding 260 m for open nozzle systems

— Part 10: Test protocol for atrium protection with sidewall nozzles for open nozzle systems

— Part 11: Test protocol for cable tunnels for open nozzle systems

— Part 12: Test protocol for commercial deep fat cooking fryers for open nozzle systems

— Part 13: Test protocol for wet benches and other similar processing equipment for open nozzle

systems

— Part 14: Test protocol for combustion turbines in enclosures exceeding 260 m for open nozzle

systems

— Part 15: Test protocol for combustion turbines in enclosures not exceeding 260 m for open nozzle

systems
) Under preparation. Stage at the time of publication prEN 14972-1:2017.
Under preparation.
) Under preparation. Stage at the time of publication prEN 14972-8:2018.
) Under preparation. Stage at the time of publication prEN 14972-9:2018.
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— Part 16: Test protocol for industrial oil cookers for open nozzle systems

— Part 17: Test protocol for residential occupancies for automatic nozzle systems

) Under preparation. Stage at the time of publication prEN 14972-16:2017
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1 Scope

This document specifies the evaluation of the fire performance of water mist systems for offices, schools

class rooms and hotels. This document test protocol is applicable to ceiling mounted automatic nozzles

to be used in unlimited volume. This document is applicable for horizontal, solid, flat ceilings with

heights of 2 m and above, up to the maximum ceiling height tested.
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 12845, Fixed firefighting systems — Automatic sprinkler systems — Design, installation and

maintenance

EN 14972-1 , Fixed firefighting systems — Water mist systems — Design and installation

EN 12259-1, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 1:

Sprinklers

ISO 5660-1, Reaction-to-fire tests — Heat release, smoke production and mass loss rate — Part 1: Heat

release rate (cone calorimeter method) and smoke production rate (dynamic measurement)

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 terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
office spaces
the following areas are considered to be office space:
— cellular offices and open plan offices;
— areas with counters;
— restaurants and kitchens;
— public areas in buildings with low fire load;
— escape routes or other corridors;
— churches;
) Under preparation. Stage at the time of publication prEN 14972-1:2017.
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— museums;
— as well as further comparable risks
3.2
hotel and school spaces
the following areas are considered to be hotel and school spaces:
— hotel rooms;
— rooms in hospitals, nursing homes, senior citizens residences;
— flats;
— training classrooms;
— recreation areas
4 General requirements

4.1 Up to a maximum of 5 nozzles used in the fire tests shall be kept for later verification.

4.2 The water mist system, operating without manual intervention, shall successfully complete all

described performance fire tests for their specific applications. For the applications “Office Spaces” and

“Hotel and School Spaces” different fuel packages are applied.

4.3 For the “Office fuel package” in accordance to 5.2 the water flow shall be shut-off 30 min after the

activation of the first sprinkler/automatic nozzle. Any remaining fire shall be manually extinguished

and the fire damage shall be recorded.

4.4 For the “Hotel and school fuel package” in accordance to 5.3 the water flow shall be shut-off

10 min after the activation of the first sprinkler/ automatic nozzle. Any remaining fire shall be manually

extinguished and the fire damage shall be recorded.

4.5 Prior to the testing, a layout of the water mist system to be tested shall be submitted for test

preparation purposes. This layout shall include any components required for the testing as well as the

full dimensioning (e.g. length of pipes, distances of automatic nozzles / sprinklers, etc.).

4.6 System components, component locations, operating conditions and test enclosure details shall

remain unaltered throughout all of the fire tests for a given application.

4.7 All fire tests shall be conducted using the manufacturer instructions in regard to automatic nozzle

placement, spray flux, and operating pressure. Sprays shall be continuous.
4.8 The test protocol is only applicable to ceiling mounted automatic nozzles.

4.9 The automatic nozzles shall be located in accordance with the manufacturer’s instructions.

4.10 The water supply shall be capable of supplying a flow rate and pressure according to the specific

requirements, which are based on the actual layout of the pipework installation.

4.11 The tests with the water mist system shall be conducted at maximum ceiling height, maximum

spacing and minimum discharge conditions regarding water flow and pressure. The system shall be

installed to reflect the maximum allowed time delay of water pressure build up of the system.

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5 Fuel packages
5.1 General

The test assembly for all fire tests shall comply with the following specifications and corresponding

figures.

The reference testing with a prescribed sprinkler system serves to indicate the baseline performance at

each different test facility and set-up. Within one test series, all fuel packages shall be identical.

The fire loads provided for the tests shall have humidity content as obtained by storage indoors at 20 °C

(±5 °C) for two weeks.
5.2 Office fuel package
5.2.1 General

The office fuel package shall consist of typical office workstations with associated fire load. The complex

geometry of the fuel package implies both horizontal and vertical spray shielding and substantial

potential for fire growth beyond the initial sprinkler operation.
The fuel package consists of the following elements:
— two table plates;
— a padded wooden-frame chair;
— a wooden drawer under one table;
— files and books on the table;
— plywood walls surrounding the tables;
— a gas burner and a wood crib for ignition.
The typical masses of the individual components shall be as listed in Table 1.
The tolerance of all dimensions is 5 %.
Table 1 — Office fire load
Combustible material Item Typical mass
Table plates 56
Wall panel 30
wood
Drawer 15
Chair (frame) 6
Filed paper 90
paper
Books 5
Newspaper 1
Chair (padding) 1
Polyether foam
Simulated files 1
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A photograph of a typical fuel package is shown in Figure 1. Below, each element is described in more

detail.
The monitor and keyboard on the table as showed in Figure 1 should not be used.
Figure 1 — Overview of the office fuel package

The tables shall be constructed of two plain uncoated 22 mm thick chipboard plates, one measuring

304 cm × 76 cm × 76 cm, the other 152 cm × 108 cm × 76 cm, as given in Figure 2. Also shown in

Figure 4 are the stands to which the table tops shall be attached by screws, and the position of the

wooden drawer, which also serves to support the table tops.
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Dimensions in centrimetres
Key
1 wooden supports 2 metal frame
Figure 2 — Schematic presentation of the table construction
5.2.2 Padded chair

The padded wooden chair shall be constructed of a plain wooden chair by attaching to it a

40 cm × 100 cm piece of cotton-covered polyether foam mattress with screws and washers. The front

edge of the chair shall be positioned flush with the edge of Table 1, and there shall be a 20 cm gap

between the chair and Table 2.
The polyether foam shall be as follows:

The mattresses shall be made of non-fire retardant polyether and they shall have a density of

approximately 33 kg/m . When tested in accordance with ISO 5660-1, the polyether foam shall give

results as given in Table 2.
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Table 2 — Cone calorimeter test for foam in accordance with ISO 5660-1
Test conditions 2
— Irradiance: 35 kW/m
— Horizontal Position
— Sample thickness: 50 mm
— No frame retainer shall be used
Test results — Time to ignition: 2 s to 6 s
— 3 min average Heat release rate HRR, q : (270 ± 50) kW/m
180
— Effective heat of combustion: (28 ± 3) MJ/kg
— Total heat release: (50 ± 12) MJ/m
5.2.3 Wooden drawer

The drawer shall be made of 20 mm thick veneered chipboard, and have the approximate measures of

40 cm × 42 cm × 58 cm and an approximate weight of 14,6 kg. Steel supports shall be mounted to the

bottom of the drawer to give the required elevation. The drawers shall be attached centrally 20 cm from

the end of the large table by four screws through the top of the table plate.

The bottommost tray shall be opened to provide a gap of 4 cm between the front of this tray and the

front of the drawer.
5.2.4 Items on the table

The combustible material on the table shall consist of paper packed in cardboard files, books and

simulated plastic files. The items shall be arranged on the table as shown in Figure 3. The simulated

plastic files shall be of size 30 cm × 30 cm × 10 cm, made out of the same polyether foam as specified for

the mattress of the chair. A newspaper weighing approximately 900 g shall be placed above the ignition

source.
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Dimensions in centimetres
Key
1 3 file folders stacked horizontally Paper files, 3 kg (horizontal)
2 folders flush to the edge of the table Paper files, 2 kg (vertical)
3 separating wall simulated files
4 chair Newspapers, 0,9 kg
5 separating wall book
Paper files, 3 kg (vertical)
Figure 3 — Layout of the combustible items on the table
5.2.5 Walls

The plywood walls shall stand on the floor and be made of 4 mm thick uncoated plywood panels

measuring 125 cm × 180 cm. Each wall shall extend 250 cm from the corner, and a 10 cm air gap shall

be left between the table plate and the wall. The plywood panels shall be attached to solid non-

combustible plates, measuring 125 cm × 180 cm.
5.2.6 The ignition source

The ignition shall be accomplished by a gas burner and a wood crib. The heat release rate of the burner

shall be 30 kW. The gas burner shall be positioned in the centre under the drawer in accordance to

Figure 5. The wood crib shall be made of 16 wood (spruce or fir) sticks measuring

30 cm × 30 cm × 250 mm and arranged in four layers of alternating orientation inside a square steel pan

of 30 cm × 30 cm × 10 cm. 250 ml of heptane shall be poured into the pan to ensure the ignition of the

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crib. The pan and crib shall be placed on the floor between the drawer and the wall, with the pan edge

flush with the drawer edge. Figure 4 shows exemplarily the ignition arrangement.

The fire shall be ignited by applying a flame over the gas burner and switching on the gas flow. The

burner shall be operated for 300 s, independent of a sprinkler or automatic nozzle activation.

Figure 4 — The positioning of the gas burner and the wood crib with respect to the drawer

5.3 Hotel and school fuel package
5.3.1 General
The test assembly shall comply with the following specifications and figures.
The test assembly shall include the following elements:
— metal frames;
— mattresses.

Figure 5 shows an example of the test assembly in accordance with the requirements specified in 5.3.2

to 5.3.4.
All tests shall be carried out with identical test assemblies.
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Dimensions in millimetres
Key
1 sofa number 1 4 sofa number 4
2 sofa number 2 5 ignition
3 sofa number 3
Figure 5 — Assembly of fire loads and position of ignition source
5.3.2 Metal frames
Four metal frames in accordance with Figure 6 and Figure 7 shall be provided.

The fire source should consist of four sofas made of mattresses as specified in 5.3.3 installed in steel

frame sofas.

The steel frames for the sofas should consist of rectangular bottom and backrest frames constructed of

(25 ± 2) mm square iron of normally 2 mm thickness. The dimensions of the bottom frame should be

2 000 mm × 700 mm and the dimensions of the backrest frame should be 2 000 mm × 725 mm. The seat

and backrest mattresses should be supported on each frame by three vertical and one horizontal steel

bars, constructed from similar steel stock. The vertical steel bars should be spaced every 500 mm and

welded to the inner long sides of the frame. The horizontal steel bar should be welded to the inner short

sides of the frame. Both steel frames should be fitted with a 150 mm by 150 mm steel plate, nominally

2 mm thick. The steel plate should be positioned directly under and behind the intended position of the

igniter, in order to prevent it from falling to the floor under a test. Each sofa should have a rectangular

armrest on each end. The armrest should be constructed of similar steel stock and should be 600 mm in

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length and 300 mm in height. The front section of the armrest should be attached to the bottom frame

70 mm from the backrest frame. The assembled frames should be supported by four legs constructed of

similar steel stock. The two rear legs should be 205 mm in height and the front legs should be 270 mm

in height. When installed, the mattress forming the seat should be installed first, with its long side edge

close up against the backrest frame. The mattress forming the backrest should be installed thereafter.

This mattress should be kept in upright position by four hooks, two on the short sides and two on the

long sides of the backrest frame (see Figure 7).

The hooks should be constructed from nominally 50 mm flat iron bars, of nominally 2 mm thickness.

The sofas should be positioned as shown in Figure 6, with the top of the backrests spaced 25 mm apart.

Dimensions in millimetres
Key
1 sofa number 1
2 sofa number 2
Figure 6 — Assembly of fire loads and metal frames
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Dimensions in millimetres
Key
1 150 mm × 150 mm steel plate 2 150 mm × 150 mm steel plate (corner tests)
a) Back support b) Back support (side view)
c) Bottom frame d) Armrest (two pieces)
e) Assembled sofa (front view) f) Assembled sofa (side view)
Figure 7 — Assembly of fire loads and metal frames
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5.3.3 Mattresses
The mattresses used in the tests shall fulfil the following requirements:
— mattress with dimensions: 2,0 m × 0,8 m × 0,1 m;

— the mattresses shall be made of non-fire retardant polyether and they shall have a density of

approximately 33 kg/m . When tested in accordance with ISO 5660-1, the polyether foam shall

give results as given in Table 2.
Table 3 — Cone calorimeter test for foam in accordance with ISO 5660-1
Test conditions 2
— Irradiance: 35 kW/m
— Horizontal Position
— Sample thickness: 50 mm
— No frame retainer shall be used
Test results — Time to ignition: 2 s to 6 s
— 3 min average Heat release rate HRR, q : (270 ± 50) kW/m
180
— Effective heat of combustion: (28 ± 3) MJ/kg
— Total heat release: (50 ± 12) MJ/m
— Mattress cover:
— material: non fire retardant cotton
2 2
— surface weight: 140 g/m – 180 g/m .

The test assembly (metal frames and mattresses) is shown exemplarily in Figure 6.

5.3.4 The ignition source

The ignition source is a unit made of fibreboard soaked in heptane in a closed plastic bag. The ignition

source is exemplarily shown in Figure 7.
The ignition source shall fulfil the following requirements:
— material: fibreboard;
— dimensions of the fibreboard: 60 mm × 60 mm × 75 mm;
— quantity of heptane: 120 ml;
— plastic bag in appropriate size.
After filling in the heptane the plastic bag shall be closed immediately.
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Figure 8 — Ignition source (exemplarily)

Figure 8 shows exemplarily the test assembly. The position of the ignition source is marked red.

Key
1 ignation source
Figure 9 — Assembly of the ignition source with respect to the fire load
6 Test arrangement
6.1 Reference sprinkler requirements
6.1.1 General

The sprinkler system used in the reference tests shall be characterized as follows:

a) classification: Ordinary Hazard 1;
7 2
b) water discharge density : 5,75 l/min/m ;
c) protected area per sprinkler: 12 m ;
d) sprinkler arrangement: square grid (3,5 m spacing);
e) sprinkler:
) This value includes a safety factor of 15 %.
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1) type: pendent or upright spray sprinkler in accordance with EN 12259-1, surface mounted on

the ceiling with a flat escutcheon in case of pendent orientation;

Note that, if the orientation of the automatic nozzles of the water mist system is upright also

upright sprinklers shall be used. In case of pendent orientation of the automatic water mist

nozzles, the sprinkler orientation shall be also pendent.
2) installation of the sprinkler according to EN 12845;
3) thermal sensitivity: special response as specified in EN 12259-1;
4) nominal K factor: 80;
5) temperature rating: 68 °C.
Figure 9 a
...

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