BS EN 14972-9-2020 Fixed firefighting systems – Water mist systems Part 9: Test protocol for machinery in enclosures not exceeding 260 m’ 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 m3.
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:_I), 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 14972.11) and the following apply.
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machinery enclosure
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.BS EN 14972-9 pdf download.