ISO 14520-10:2005 pdf free

ISO 14520-10:2005 pdf free.Gaseous fire-extinguishing systems一Physical properties and system design
This part of ISO 14520 gives 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. This does not preclude the use of other systems.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 14520-1:一1 )，Gaseous fire-extinguishing systems 一Physical properties and system design 一Part 1: General requirements
HFC 23 total flooding systems may be used for extinguishing fires of all classes within the limits specified in ISO 14520-1:一2), 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 given in ISO 14520-1一2), 7.6.
The extinguishing concentrations and design concentrations for n-heptane and surface Class A hazards are given in Table 4，concentrations for acetone heptane, methanol and toluene in Table 5，and inerting concentrations in Table 6.
The extinguishment values for the Class B and the Surface Class A fuels are determined by testing in accordance with ISO 14520-1:一3), Annexes B and C.
The minimum design concentration for the Class B fuel is the higher value of the heptane cup burner or room test heptane extinguishment concentration multiplied by 1,3.
The minimum design concentration for Surface Class A fuel is the highest value of the wood crib, PMMA, PP or ABS extinguishment concentrations multiplied by 1,3. In the absence of any of the 4 extinguishment values, the minimum design concentration for Surface Class A shall be that of Higher Hazard Class A.
See ISO 14520-1:一3), 7.5.1.3, for guidance on Class A fuels.
The extinguishing and design concentrations for room-scale test fires are for informational purposes only. Lower and higher extinguishing concentrations than those shown for room-scale test fires may be achieved and allowed when validated by test reports from internationally recognized laboratories.ISO 14520-10 pdf free.