Fixed firefighting systems - Water mist systems - Part 14: Test protocol for combustion turbines in enclosures exceeding 260 m³ for open nozzle systems

This document specifies fire testing requirements for water mist systems used for fire protection of combustion turbines in enclosures with volumes exceeding 260 m³.

Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 14: Brandversuchsprotokoll für Verbrennungsturbinen in Gehäusen über 260 m³ für offene Düsensysteme

Dieses Dokument legt Anforderungen an Brandprüfungen für Feinsprüh Löschanlagen fest, die für den Brandschutz von Verbrennungsturbinen in Gehäusen mit einem Volumen über 260 m³ eingesetzt werden.

Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 14 : Protocole d'essai des systèmes à buses ouvertes pour turbines à combustion situées dans des enceintes de plus de 260 m³

Le présent document spécifie les exigences relatives aux essais au feu des systèmes à brouillard d'eau utilisés pour la protection contre l'incendie des turbines à combustion situées dans des enceintes d'un volume supérieur à 260 m³.

Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 14. del: Protokol preskušanja sistemov z odprtimi šobami za požarno zaščito turbin v ohišjih nad 260 m³

General Information

Status
Published
Public Enquiry End Date
19-May-2020
Publication Date
14-Nov-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Oct-2021
Due Date
23-Dec-2021
Completion Date
15-Nov-2021

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SLOVENSKI STANDARD
SIST EN 14972-14:2021
01-december-2021
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 14. del: Protokol preskušanja
sistemov z odprtimi šobami za požarno zaščito turbin v ohišjih nad 260 m³

Fixed firefighting systems - Water mist systems - Part 14: Test protocol for combustion

turbines in enclosures exceeding 260 m³ for open nozzle systems
Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 14:

Brandversuchsprotokoll für Verbrennungsturbinen in Gehäusen über 260 m³ für offene

Düsensysteme

Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 14 :

Protocole d'essai des systèmes à buses ouvertes pour turbines à combustion situées

dans des enceintes de plus de 260 m³
Ta slovenski standard je istoveten z: EN 14972-14:2021
ICS:
13.220.10 Gašenje požara Fire-fighting
SIST EN 14972-14:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 14972-14:2021
---------------------- Page: 2 ----------------------
SIST EN 14972-14:2021
EN 14972-14
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 13.220.20
English Version
Fixed firefighting systems - Water mist systems - Part 14:
Test protocol for combustion turbines in enclosures
exceeding 260 m³ for open nozzle systems

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

à brouillard d'eau - Partie 14 : Protocole d'essai des Wassernebelsysteme - Teil 14: Prüfprotokoll für

systèmes à buses ouvertes pour turbines à combustion Verbrennungsturbinen in Gehäusen über 260 m³ für

situées dans des enceintes de plus de 260 m³ offene Düsensysteme
This European Standard was approved by CEN on 2 August 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 14972-14:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
Contents Page

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

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

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

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

4 General requirements ................................................................................................................................... 5

5 Test enclosure requirements ...................................................................................................................... 6

6 Combustion turbine mock-up requirements ........................................................................................ 8

6.1 Combustion turbine mock-up unit ............................................................................................................ 8

6.2 Combustion turbine spray cooling mock-up unit ............................................................................. 11

7 Test equipment requirements ................................................................................................................ 13

8 Instrumentation requirements ............................................................................................................... 14

9 Fire test requirements ............................................................................................................................... 16

9.1 General ............................................................................................................................................................. 16

9.2 Low pressure, exposed, diesel spray fire............................................................................................. 16

9.3 Low pressure, angled, diesel spray fire ................................................................................................ 16

9.4 Low pressure, concealed, diesel spray fire ......................................................................................... 17

9.5 High pressure, exposed, diesel spray fire............................................................................................ 17

9.6 Low pressure-low flow, concealed, diesel spray and pool fires .................................................. 18

9.7 Concealed, heptane pool fire .................................................................................................................... 18

9.8 Flowing fire..................................................................................................................................................... 19

9.9 Wood crib and heptane pool fire ............................................................................................................ 19

9.10 Spray cooling (optional test) .................................................................................................................... 20

9.11 Saturated insulation mat and spray fire (optional test) ................................................................ 20

9.12 Saturated insulation mat fire (optional test) ..................................................................................... 21

10 Test report ...................................................................................................................................................... 21

---------------------- Page: 4 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
European foreword

This document (EN 14972-14:2021) 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 March 2022, and conflicting national standards shall

be withdrawn at the latest by March 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;

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

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

---------------------- Page: 5 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)

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.

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.
---------------------- Page: 6 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
1 Scope

This document specifies the evaluation of the fire performance for water mist systems used for fire

protection of combustion turbines in enclosures with volumes exceeding 260 m .
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 14972-1:2020, Fixed firefighting systems — Water mist systems — Part 1: Design, installation,

inspection and maintenance

EN 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy

structural steels
3 Terms and definitions

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

ISO and IEC maintain terminological 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/
4 General requirements

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

described performance fire tests for their specific applications.

4.2 The fire tests shall be conducted until the fire is extinguished or suppressed, as required by the

applicable fire test for their specific applications.

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

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

4.4 All fire tests shall be conducted using the specifications from the manufacturer’s DIOM manual

(design, installation, operation and maintenance manual) in regard to nozzle placement, spray flux, and

spray duration. Sprays can be continuous or intermittent in time. In the case of intermittent, or cycled,

sprays, the time period during which the system is not discharging shall not be greater than 50 % of one

complete on/off cycle. The system off period shall not exceed 1 min.

4.5 In conjunction with the performance fire tests, all twin fluid water mist systems (except for those

applying compressed air) shall be subjected to a straight discharge test with no fire to evaluate the

resulting discharge and oxygen concentration. This evaluation shall be conducted using the maximum

extinguishing agent flow and pressure. The discharge duration for the test shall be the maximum

required for the system and occupancy to be protected. Oxygen measurements shall be recorded at a

location(s) within the test enclosure. This information shall be used to evaluate personnel safety, and

shall be accounted for in the manufacturer’s DIOM manual.
---------------------- Page: 7 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)

4.6 In addition to the fire tests, an optional spray cooling test may be conducted, and the results shall

be analysed by heat transfer calculations to confirm that excessive turbine shell distortion is avoided.

No direct spray impingement onto the turbine casing is allowed in real installations unless otherwise

proven by the heat transfer calculations using the spray cooling test results.

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

5 Test enclosure requirements

The maximum enclosure volume (as specified by the manufacturer) shall be tested (see Figure 1).

The enclosure area should be preferably squared. If this is not possible length of the sides shall not

exceed 2,5:1 ratio. In any case the length of any of the sides shall be at least 8,00 m.

The maximum enclosure height (as specified by the manufacturer) shall be tested. The enclosure shall

be constructed of wood or metal frame with an inner lining of minimum 13 mm gypsum or 0,7 mm

galvanized steel.

To minimize leakages, all joints and gaps shall be sealed. An opening measuring 2 m by 2 m and 0,5 m

above the floor level shall be installed in the centre of one wall, as shown in Figure 1.

A minimum of two hinged ceiling hatches measuring approximately 1 m by 2 m shall be installed in

opposite diagonal corners for heat and smoke release at the conclusion of the fire test. The floor shall be

non-combustible and any floor drainage or vent openings shall be sealed during testing.

A small vent can be provided to allow the intake of air, to prevent excessive suctioning of the walls and

ceiling and maintain structural integrity of the fire test enclosure.

The combustion turbine and engine mock-up unit shall be centred in the test enclosure.

---------------------- Page: 8 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
Dimensions in metres
Key
a) front view 4 opening
b) top view 5 steel pipe
1 tray for Class A fire test h height
2 bilge enclosure L length
3 test enclosure
Figure 1 — Combustion turbine test enclosure
---------------------- Page: 9 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
6 Combustion turbine mock-up requirements
6.1 Combustion turbine mock-up unit

The mock-up unit measures 3 m long by 1 m wide by 3 m high (see Figure 2 and Figure 3). It is

fabricated from sheet steel with a nominal thickness of 5 mm. A tray with a depth of 100 mm is formed

at the top of the mock-up unit. Two 30 cm nominal diameter pipes, 3 m in length, are attached to the

unit to simulate obstructions. A 0,7 m wide solid shelf is also connected to the unit, which provides a

barrier to allow shielded fire tests to be conducted. Placement of additional baffles or obstructions can

be needed to prevent the direct impact of mist on the pool or spray test fires.

A 200 mm × 50 mm notch is cut into the side of the top tray opposite the solid shelf for the purposes of

the flowing fire test (see Figure 2 and Figure 3).

The mock-up unit shall be surrounded by a steel floor plate system, 6 m long × 4 m wide × 0,75 m high.

A 4 m × 0,254 m high square pan shall be located underneath the floor plate system.

---------------------- Page: 10 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
Dimensions in metres
Key
a) front view 6 location for notch for flowing fuel
b) top view 7 2
top tray (3,00 m )
1 exposed and concealed spray nozzle 8 solid steel plate (5,00 mm)
2 bilge steel plate 9 steel pipes
3 bilge enclosure 10 gap between engine and inside perimeter of bilge plate
4 2 thermocouple
tray (0,1 m )
---------------------- Page: 11 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
5 2
tray (4,00 m )
Figure 2 — Combustion turbine mock-up unit
Dimensions in metres
Key
1 obstruction rod 6 bilge enclosure
2 flowing oil feed pipe DN 12 7 concealed oil spray
3 steel pipes 8 2
tray (4,00 m )
4 engine mock-up a notch for flowing fuel (detail view)
5 bilge steel plate thermocouple
Figure 3 — Combustion turbine mock-up unit (continued)
---------------------- Page: 12 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
6.2 Combustion turbine spray cooling mock-up unit

The combustion turbine casing mock-up is simulated with a horizontal flat steel plate (see Figure 4).

The specific details and thermal mass of the obstructions are not simulated.

A horizontal hot rolled 1.0044 steel plate according to EN 10025-2 or other equivalent steel (in lieu of

actual turbine casing material like ductile iron), 1,0 m wide by 2,0 m long by 5 cm thick, is placed at 1 m

elevation on steel legs at the four corners of the plate. This is located as described above or at a location

within the test cell to be selected after the nozzles are installed (as per manufacturer's design criteria).

The centre of the plate is instrumented across its thickness with thermocouples placed at various

depths, as described below.

To determine the cooling rate of the combustion turbine steel plate mock-up, caused by the discharge of

the water mist system, three thermocouples shall each be embedded near the centre of the plate at

approximately 12 mm, 25 mm, and 38 mm below the plate’s top surface. The three stainless steel-

sheathed thermocouples shall be embedded in the plate by removing cylindrical plugs from the plate.

The thermocouples shall be inserted to allow the thermocouple wire to follow a horizontal path of

sixteen thermocouple diameters in length, thus reducing errors due to the vertical temperature

gradient in the plate. A heat conductive and electrically insulating sealant shall be applied, and the steel

cylindrical plugs shall be replaced and welded to the plate around the top periphery of the plugs. This

can be accomplished by using a 25 mm diameter miller tool, installing the thermocouples, and then

refilling the hole with welded 25 mm round bar stock (see Figure 5).
---------------------- Page: 13 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
Dimensions in metres
Key
a) top view 4 spray fire
b) side view 5 steel plate (50 mm thick)
1 spray fuel nozzle 6 water mist nozzle centred over steel plate at minimum
stand-off distance as specified by the manufacturer
2 can stabilizer 7 gas sampling port
3 flame thermocouple 8 floor
Figure 4 — Fire source configuration for spray cooling testing
---------------------- Page: 14 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)
Dimensions in metres
Key
1 diameter hole for thermocouple (1,6 mm) 6 weld
2 top 7 plug (same material as the steel plate)
3 specified depth 8 main axis
4 45° chamfer 9 2nd axis
5 bottom
Figure 5 — Detail of embedded thermocouple for spray cooling test
7 Test equipment requirements

7.1 The test laboratory shall be of adequate size with natural or minimal ventilation so as to not

interfere with the fire testing within the enclosure or about the mock-up or test fuel package.

7.2 The size of the test laboratory shall not impact extinguishment of any test fires (i.e. depletion of

oxygen due to an inadequately sized test laboratory).
---------------------- Page: 15 ----------------------
SIST EN 14972-14:2021
EN 14972-14:2021 (E)

7.3 For all fire tests accumulated water on the floor and on all flat surfaces shall be wiped out before

the test.
7.4 The test e
...

SLOVENSKI STANDARD
oSIST prEN 14972-14:2020
01-maj-2020
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 14. del: Protokol preskušanja
sistemov z odprtimi šobami za požarno zaščito turbin v ohišjih nad 260 m³

Fixed firefighting systems - Water mist systems - Part 14: Test protocol for combustion

turbines in enclosures exceeding 260 m³ for open nozzle systems
Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-Löschanlagen - Teil 14:

Brandversuchsprotokoll für Verbrennungsturbinen in Gehäusen über 260 m³ für offene

Düsensysteme

Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 14 :

Protocole d'essai des systèmes à buses ouvertes pour turbines à combustion situées

dans des enceintes de plus de 260 m³
Ta slovenski standard je istoveten z: prEN 14972-14
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 14972-14:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 14972-14:2020
---------------------- Page: 2 ----------------------
oSIST prEN 14972-14:2020
DRAFT
EUROPEAN STANDARD
prEN 14972-14
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS 13.220.20
English Version
Fixed firefighting systems - Water mist systems - Part 14:
Test protocol for combustion turbines in enclosures
exceeding 260 m³ for open nozzle systems

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

à brouillard d'eau - Partie 14 : Protocole d'essai des Löschanlagen - Teil 14: Brandversuchsprotokoll für

systèmes à buses ouvertes pour turbines à combustion Verbrennungsturbinen in Gehäusen über 260 m³ für

situées dans des enceintes de plus de 260 m³ offene 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, 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.

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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14972-14:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
Contents Page

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

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

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

5 Test enclosure requirements ...................................................................................................................... 5

6 Combustion turbine mock-up requirements ........................................................................................ 6

6.1 Combustion turbine mock-up unit ............................................................................................................ 6

6.2 Combustion turbine spray cooling mock-up unit ............................................................................. 10

7 Test equipment requirements ................................................................................................................ 12

8 Instrumentation requirements ............................................................................................................... 13

9 Fire test requirements ............................................................................................................................... 15

9.1 General ............................................................................................................................................................. 15

9.2 Low pressure, exposed, diesel spray fire............................................................................................. 15

9.3 Low pressure, angled, diesel spray fire ................................................................................................ 15

9.4 Low pressure, concealed, diesel spray fire ......................................................................................... 16

9.5 High pressure, exposed, diesel spray .................................................................................................... 16

9.6 Low pressure-low flow, concealed, diesel spray and pool fires .................................................. 17

9.7 Concealed, heptane pool fire .................................................................................................................... 17

9.8 Flowing fire..................................................................................................................................................... 18

9.9 Wood crib and heptane pool fire ............................................................................................................ 18

9.10 Spray cooling (no fire, optional test) .................................................................................................... 19

9.11 Saturated insulation mat and spray fire (optional test) ................................................................ 19

9.12 Saturated insulation mat fire (optional test) ..................................................................................... 20

10 Test report ...................................................................................................................................................... 20

---------------------- Page: 4 ----------------------
oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
European foreword

This document (prEN 14972-14:2020) 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;

— 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;

— 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;
— 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.
---------------------- Page: 5 ----------------------
oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
1 Scope

This document specifies fire testing requirements for water mist systems used for fire protection of

combustion turbines in enclosures with volumes exceeding 260 m .
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

prEN 14972-1:2019, Fixed firefighting systems — Water mist systems — Design, installation, inspection

and maintenance

EN 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy

structural steels
3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 14972-1 apply.

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

— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 General requirements

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

described performance fire tests for their specific applications.

4.2 The fire tests shall be conducted until the fire is extinguished or suppressed, as required by the

applicable fire test for their specific applications.

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

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

4.4 All fire tests shall be conducted using the specifications from the manufacturer’s DIOM manual

(design, installation, operation and maintenance manual) in regard to nozzle placement, spray flux, and

spray duration. Sprays can be continuous or intermittent in time. In the case of intermittent, or cycled,

sprays, the time period during which the system is not discharging shall not be greater than 50 % of one

complete on/off cycle. The system off period shall not exceed one minute.

4.5 In conjunction with the performance fire tests, all twin fluid water mist systems shall be subjected

to a straight discharge test with no fire to evaluate the resulting discharge and oxygen concentration.

This evaluation shall be conducted using the maximum extinguishing agent flow and pressure. The

discharge duration for the test shall be the maximum required for the system and occupancy to be

protected. Oxygen measurements shall be recorded at a location(s) within the test enclosure. This

information shall be used to evaluate personnel safety, and shall be accounted for in the manufacturer’s

DIOM manual.
---------------------- Page: 6 ----------------------
oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)

4.6 In addition to the fire tests, an optional spray cooling test may be conducted, and the results are to

be analysed by heat transfer calculations. No direct spray impingement onto the turbine casing is

allowed in real installations unless otherwise proven by the heat transfer calculations using the spray

cooling test results.

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

5 Test enclosure requirements

The maximum enclosure area (as specified by the manufacturer) shall be tested (see Figure 1).

Enclosures should have equal length sides, although rectangular areas will be considered. Restrictions

of the scope to a limited range of aspect ratios depending on the outcome of the fire tests conducted in

non-symmetric enclosures are possible.

The maximum enclosure height (as specified by the manufacturer) shall be tested. Enclosure heights

shall be in 0,3 m increments. The enclosure shall be constructed of wood or metal frame with an inner

lining of minimum 13 mm gypsum or 0,7 mm galvanized steel.

To minimize leakages, all joints and gaps shall be sealed. An opening measuring 2 m by 2 m and 0,5 m

above the floor level shall be installed in the centre of one wall, as shown in Figure 1. A minimum of two

hinged ceiling hatches measuring approximately 0,9 m by 1,8 m shall be installed in opposite diagonal

corners for heat and smoke release at the conclusion of the fire test. The floor shall be non-combustible

and any floor drainage or vent openings shall be sealed during testing. A small louvered vent can be

provided to allow the intake of air, to prevent excessive suctioning of the walls and ceiling and maintain

structural integrity of the fire test enclosure.

The combustion turbine and engine mock-up unit shall be centred in the test enclosure. In the case of

rectangular enclosures, alternative placement of the mock-up unit based on the aspect ratio of the

enclosure is possible.

Additional fire tests in smaller enclosures can be performed to validate the manufacturer’s scaling

parameters.
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
Dimensions in millimetres
Key
1 tray for Class A fire test 4 opening
2 bilge enclosure 5 diameter pipe
3 test enclosure
Figure 1 — Combustion turbine test enclosure
6 Combustion turbine mock-up requirements
6.1 Combustion turbine mock-up unit

The mock-up unit measures 3 m long by 1 m wide by 3 m high (see Figures 2 and 3). It is fabricated

from sheet steel with a nominal thickness of 5 mm. A tray with a depth of 100 mm is formed at the top

of the mock-up unit. Two 30 cm nominal diameter pipes, 3 m in length, are attached to the unit to

simulate obstructions. A 0,7 m wide solid shelf is also connected to the unit, which provides a barrier to

allow shielded fire tests to be conducted. Placement of additional baffles or obstructions can be needed

to prevent the direct impact of mist on the pool or spray test fires.
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)

A 200 mm by 50 mm notch is cut into the side of the top tray opposite the solid shelf for the purposes of

the flowing fire test (see Figure 2 and 3).

The mock-up unit is surrounded by a steel floor plate system, 6 m long by 4 m wide by 0,75 m high. A

4 m by 0,254 m high square pan shall be located underneath the floor plate system.

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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
Dimensions in millimetres
Key
1 exposed and concealed spray nozzle 7 location for notch for flowing fuel
2 bilge steel plate 8 top tray (3,00 m )
3 bilge enclosure 9 solid steel plate (5,00 m )
4 tray (0,1 m ) 10 steel pipes
5 tray (4,00 m ) 11 gap between engine and inside perimeter of bilge plate
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
6 bilge enclosure thermocouple
Figure 2 — Combustion turbine mock-up unit
Dimensions in millimetres
Key
1 obstruction rod 7 concealed oil spray
2 flowing oil feed pipe DN 12 8 tray (4,00 m )
3 steel pipe notch for flowing fuel
4 engine mock-up
5 bilge steel plate
6 bilge enclosure
Figure 3 — Combustion turbine mock-up unit (continued)
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
6.2 Combustion turbine spray cooling mock-up unit

The combustion turbine casing mock-up is simulated with a horizontal flat steel plate (see Figure 4).

The specific details and thermal mass of the obstructions are not simulated.

A horizontal hot rolled 1,0044 steel plate according to EN 10025-2 or other equivalent steel, 1,0 m wide

by 2,0 m long by 5 cm thick, is placed at 1 m elevation on steel legs at the four corners of the plate. This

is located as described above or at a location within the test cell to be selected after the nozzles are

installed (as per manufacturer's design criteria). In lieu of actual turbine casing material, which is

typically ductile iron, the test plate is constructed of hot rolled 1,0044 steel or other equivalent steel.

The centre of the plate is instrumented across its thickness with thermocouples placed at various

depths, as described below.

To determine the cooling rate of the combustion turbine steel plate mock-up, caused by the discharge of

the water mist system, three thermocouples shall each be embedded near the centre of the plate at

approximately 12 mm, 25 mm, and 38 mm below the plate’s top surface. The three Inconel-sheathed

thermocouples shall be embedded in the plate by removing cylindrical plugs from the plate.

The thermocouples shall be inserted to allow the thermocouple wire to follow a horizontal path of

sixteen thermocouple diameters in length, thus reducing errors due to the vertical temperature

gradient in the plate. A heat conductive and electrically insulating sealant shall be applied, and the steel

cylindrical plugs shall be replaced and welded to the plate around the top periphery of the plugs. This

can be accomplished by using a 25 mm diameter miller tool, installing the thermocouples, and then

refilling the hole welded 25 mm round bar stock (see Figure 5).
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
Dimensions in millimetres
Key
a) plan view b) elevation view
1 spray fuel nozzle 6 water mist nozzle
2 can stabilizer 7 centred over steel plate
3 flame TC 8 gas sampling port
4 spray fire 9 fuel discharge direction
5 steel plate (50 mm thick) 10 floor
Figure 4 — Fire source configuration for spray cooling (no fire) testing
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)
Dimensions in millimetres
Key
1 diameter hole for thermocouple (1,6 mm) 6 weld
2 top 7 A36 plug
3 specified depth 8 main axis
4 45 ° chamfer 9 2nd axis
5 bottom
Figure 5 — Detail of embedded thermocouple for spray cooling test
7 Test equipment requirements

7.1 The test laboratory shall be of adequate size with natural or minimal ventilation so as to not

interfere with the fire testing within the enclosure or about the mock-up or test fuel package.

7.2 The size of the test laboratory shall not impact extinguishment of any test fires (i.e. depletion of

oxygen due to an inadequately sized test laboratory).
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oSIST prEN 14972-14:2020
prEN 14972-14:2020 (E)

7.3 For all fire tests, the ceiling, floor, and walls shall be as dry as possible, with only ambient

moisture content allowed. The relative humidity in the test enclosure shall not significantly differ from

that of the ambient relative humidity.

7.4 The test enclosures or laboratory shall be at an ambient temperature of 20 °C ± 10 °C prior to the

start of the test. The enclosure or hall shall be at as uniform an ambient temperature as reasonably

possible. Localized hot or cold spots are not permitted. All non-fire induced drafts shall be eliminated.

7.5 The minimum operating nozzle pressure (as specified by the manufacturer) shall be used for all

tests, unless otherwise noted. System operating pressures shall be repeatable to within ± 5 %. If the

system pressures cannot be controlled within the specified tolerance, fire tests shall be conducted at the

minimum and maximum pressure by using external means to control the system pressure.

7.6 The maximum nozzle ceiling height and spacin
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