FprEN 14972-14

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

Brandversuchsprotokoll für Verbrennungsturbinen in Gehäusen über 260 m³ für offene

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

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

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

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

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

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

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

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

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

This document (prEN 14972-14:2020) has been prepared by Technical Committee CEN/TC 191 “Fixed

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

— 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 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 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

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

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

— 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

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

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

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

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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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 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.

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

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

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

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

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

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.