BS EN 15004-6:2020 pdf free.Fixed firefighting systems一Gas extinguishing systems.Physical properties and system design of gas extinguishing systems for HFC 23 extinguishant.
BS EN 15004-6 1 Scope This document contains specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 23 extinguishant. It includes details of physical properties, specification, usage and safety
aspects and is applicable to systems operating at a nominal pressure of 41 bar without nitrogen superpressurization and 70 bar superpressurized with nitrogen.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 15004-1:2019, Fixed firefighting systems 一Gas extinguishing systems一Part 1: Design, installation and maintenance 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 15004-1 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses:一ISO Online browsing platform: available at http://www.iso.org/obp一IEC Electropedia: available at http://www.electropedia.org/Extinguishant HFC 23 shall comply with the specification shown in Table 1.HFC 23 is a colourless, almost odourless, electrically non-conductive gas with a density approximately 2,4 times that of air.
The physical properties are shown in Table 2. HFC 23 extinguishes fires mainly by physical means, but by some chemical means.HFC 23 total flooding systems may be used for extinguishing fires of all classes within the limits
specified in EN 15004-1:2019, Clause 4.The extinguishant requirements per volume of protected space are shown in Table 3 for various levels of concentration. These are based on methods shown in EN 15004-1:2019, 7.6.
The extinguishing concentrations and design concentrations for n-heptane and surface class A hazards are shown in Table 4. Any hazard to personnel created by the discharge of HFC 23 shall be considered in the design of the
system.Potential hazards can arise from the following:a) the extinguishant itself;b) the combustion products of the fire;c) breakdown products of the extinguishant resulting from exposure to fire.For minimum safety requirements, see EN 15004-1:2019, Clause 5.BS EN 15004-6 pdf downlaod.