BS EN 14972-9-2020 pdf free download.Fixed firefighting systems — Water mist systems Part 9: Test protocol for machinery in enclosures not exceeding 260 m ³ for open nozzle systems
This document specifies fire testing requirements for water mist systems used for fire protection of machinery in enclosures with volumes not exceeding 260 m 3 .
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:— 1) , Fixed firefighting systems — Water mist systems— Part 1: Design, installation, inspection and maintenance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14972-1 1) and the following 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 http://www.electropedia.org/
3.1 machinery enclosure <water mist systems> any enclosure containing equipment that uses fuel and/or lubrication fluids with volatilities less than or equal to heptane 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, as required by the applicable fire test.
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 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 (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.
4.6 Up to a maximum of 5 nozzles used in the fire tests shall be kept for later verification.
5 Test enclosure requirements
The test enclosure volume shall have main dimensions of 7,30 m by 7,30 m by 4,90 m high. The enclosure shall be constructed of wood or metal frame with an inner lining of minimum 13,00 mm gypsum or 0,70 mm galvanized steel (see Figure 1). To minimize leakages, all joints and gaps shall be sealed. At 2,70 m from one of the enclosure corners, in one of the walls parallel to the machinery equipment mock-up, a 0,80 m by 2,00 m high personnel door shall be installed with a locking mechanism. A 1,20 m by 2,40 m high removable panel shall also be installed in one of the walls to allow for test enclosure access (The personnel door can be constructed within this panel).
A minimum of two hinged ceiling hatches measuring approximately 0,90 m by 1,80 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.BS EN 14972-9 pdf download.