BS EN 14972-9:2020 pdf free download – Fixed firefighting systems一Water mist systems Part 9: Test protocol for machinery in enclosures not exceeding 260 m’ for open nozzle systems.
8 Instrumentation requirements
The following measurements shall be recorded to within a ±5 % tolerance level at intervals not exceeding one second using a computerized data acquisition system. Measurements shall begin and end at least one minute prior to ignition and after extinguishment of the test fire(s).
a) Fuel pressure and flow at the outlet of fuel pump (fuel flow and pressure shall be measured prior to each test series).
b) Fuel temperature within the fuel storage container. All fuels shall be at an ambient temperature of
(20±10)°C.
c) Temperature of fuel in pools with thermocouple located in the approximate centre of the initial fuel layer. All fuels shall initially be at an ambient temperature of(20 ± 10) DC.
d) Test enclosure temperatures measured in the centre portion of the room at the 1/3, 2/3 and ceiling heights. The enclosure and mock-up shall initially be at an ambient temperature (20 ± 10) °C for all tests.
e) Temperature of air into the spray fires, measured approximately 50,00 cm horizontally behind fuel spray nozzle with bare bead thermocouples welded from chromel-alumel wire, with a diameter of 0,32 mm.
f) Pool fire temperatures with a thermocouple located approximately 2,5 cm above the initial pool surface and 25 cm within the pool rim.
g) Spray fire temperatures with a thermocouple located approximately 25,00 cm ahead of flame stabilizer at the cone radius.
h) Extinguishment shall be registered by thermocouples located above the pools and in front of the spray fires as previously described. The fire can be considered to be extinguished when temperature registration drops below 100 °C and does not increase. Registration by means of thermal imaging equipment, in addition to the thermocouples, is strongly encouraged.
i) For the spray fires, conventional oil burner nozzles are used, meeting the requirements in Tables 1
j) The fixture stand for the spray fire arrangements shall be constructed of a metal, self-standing
secure arrangement with the oil burner nozzle mounted within and centred at the closed end of a
metal cylindrical flame stabilizer can measuring 150,00 mm diameter by 75,00 mm long with a
thickness 0,25 mm.
k) Trays shall be 1,00 m wide by 1,00 m long, of steel construction, 1,73 mm thickness by 10,00 cm high, with no lip. A water base of 5,00 cm in height with a fuel load of at least 2,00 cm above shall be used. Freeboard shall be 3,00 cm. Freeboard can be greater than 3,00 cm high, if a constant freeboard height is used for all application fire tests. Tray surfaces shall be smooth and edges shall be free of imperfections.
9 Fire test requirements
9.1 General
The water mist system shall successfully complete all ten performance fire tests described in this section. During the fire tests, all systems shall operate without manual intervention.
9.2 Unshielded 1 MW diesel spray fire.