BS EN 15004-4:2020 pdf free.Fixed firefighting systems一Gas extinguishing systems,Physical properties and system design of gas extinguishing systems for HFC 125 extinguishant.
BS EN 15004-4 This document specifies requirements for gaseous fire-extinguishing systems, with respect to the HFC 125 extinguishant. It includes details of physical properties, specification, usage and safety aspects.This document is applicable for systems operating at nominal pressures of 25 bar and 42 bar, superpressurized with nitrogen. This does not preclude the use of other systems.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 (ISO 14520- 1:2015, modified)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/HFC 125 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.The fill density of the container shall not exceed the values shown in Table 6 for 25 bar system and Table 7 for 42 bar system. Exceeding the maximum fill density may result in the container becoming “liquid full”, with the effect that an extremely high rise in pressure occurs with small increases in temperature, which could adversely affect the integrity of the container assembly.The relationships between pressure and temperature are shown in Figure 1 for various levels of fill density.BS EN 15004-4 pdf download.