ISO 14520-8:2019 PDF

Name: ISO 14520-8:2019 — Gaseous fire-extinguishing systems — Physical properties and system design — Part 8: HFC 125 extinguishant
SKU: ISO 14520-8:2019
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Gaseous fire-extinguishing systems — Physical properties and system design — Part 8: HFC 125 extinguishant

Название (английский):

ISO 14520-8:2019

Gaseous fire-extinguishing systems — Physical properties and system design — Part 8: HFC 125 extinguishant

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 2 июля 2019 г.
Издание:: ISO IS 14520 edition 4 version 1
ICS:: 13.220.10

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Описание (английский):

This document contains specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 125 extinguishant. It includes details of physical properties, specifications, usage and safety aspects. This document is applicable to systems operating at nominal pressures of 25 bar and 42 bar, superpressurized with nitrogen. This does not preclude the use of other systems.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 14520-8:2019 specifies physical properties, performance requirements and system-design rules for gaseous fire‑extinguishing systems using HFC‑125 (pentafluoroethane). The standard covers storage, filling, superpressurization (nominal systems at 25 bar and 42 bar), extinguishing concentrations for total‑flooding applications, basic toxicological and environmental data, and minimum safety considerations for personnel and system integrity.

Key topics and technical requirements

Extinguishant specification: minimum purity 99.6% by mass; water ≤ 10 ppm; acidity ≤ 3 ppm; non‑volatile residue ≤ 0.01%.

Physical properties: molecular mass 120.02, boiling point −48.09 °C, freezing point −101 °C, critical temperature 66.02 °C, critical pressure 36.18 bar abs.

Storage & fill density: maximum fill density 929 kg/m3 (for both 25 and 42 bar systems). Exceeding fill limits can cause “liquid full” containers and unsafe pressure rises.

Superpressurization: containers superpressurized with nitrogen (moisture ≤ 60 ppm) to equilibrium pressures of 25 bar or 42 bar at 20 °C. Manufacturer data required for alternative fill/superpressurization levels (pressure vs temperature curves, max fill density, etc.).

Design & extinguishing concentrations: extinguishment and minimum design concentrations are given for representative fuels (e.g., heptane extinguishment 9.3% by volume, minimum design 12.1%; wood crib extinguishment 6.7%, minimum design 11.2%). Tables provide agent mass per unit volume across temperatures for target concentrations (total flooding).

Safety and toxicology: NOAEL 7.5% by volume, LOAEL 10%; approximate lethal concentration (ALC) for a 4‑hour rat exposure >70% by volume. Designers must consider hazards from the agent, combustion and breakdown products.

Environmental data: GWP (100 yr) = 3,500; ODP = 0.

Applications

Design and specification of total‑flooding gaseous fire‑extinguishing systems using HFC‑125 in enclosures (electrical rooms, data centers, machinery spaces, storage areas) where a gaseous agent is required.

Determining agent quantities, container selection, and pressure/temperature safety limits for storage and transport.

Risk assessments addressing personnel safety, toxicology limits, and emergency planning for system discharge.

Related standards

ISO 14520‑1:2015 - Gaseous fire‑extinguishing systems - Part 1: General requirements

Other parts of the ISO 14520 series (see ISO catalogue) for additional agent‑specific or application rules

Keywords: ISO 14520-8, HFC‑125, gaseous fire‑extinguishing systems, total flooding, fill density, superpressurization, design concentration, GWP 3500, nitrogen pressurization, fire protection design.

ISO 14520-8:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who should use this standard

Related standards

Технические детали

ISO 14520-1:2015

Gaseous fire-extinguishing systems — Physical properties and system design — Part 1: General requirements

BS ISO 14520-11:2005

Gaseous fire-extinguishing systems. Physical properties and system design. HFC 236fa extinguishant.

SIST EN 15004-4:2020

Fixed firefighting systems - Gas extinguishing systems - Part 4: Physical properties and system design of gas…