本文件规定了当存在爆炸性气体-空气或蒸汽-空气混合物时防止火焰传播的阻火器的要求。它为分类、基本结构和使用信息（包括阻火器的标记）制定了统一的原则，并规定了验证安全要求和确定安全使用极限的测试方法。本文件适用于80 kPa至160 kPa的压力和-20°C至+200°C的温度。本文件不适用于以下情况:-可能需要将操作条件保持在既定安全限值内的外部安全相关测量和控制设备； -用于蒸汽和气体的爆炸性混合物的阻火器，这些混合物易于自分解（例如乙炔）或化学不稳定；-用于二硫化碳的阻火器，由于其特殊性能；-预期用途为气体-空气或蒸汽-空气混合物以外的混合物的阻火器（例如，更高的氧氮比、氯作为氧化剂）；-往复式内燃机的阻火器试验程序快速阀、灭火系统和其他防爆系统气体探测器中使用的阻火器（例如IEC 60079？29？1和IEC 62990？1所涵盖的阻火器）。 本版本取消并取代了经过技术修订的ISO 16852:2016。本版本为技术修订版。本版本包括以下与ISO 16852:2016相关的重大技术更改:a）对相关IEC TC 31标准要求的改编；b） 在T0不大于气体-空气混合物自燃温度的80%的条件下，将温度范围的上限从150°C修改为200°C；c） 由于IEC/TC 31中的编辑要求，将术语“爆炸组”更改为“设备组”；d） 阐明7中预期操作条件在大气条件之外的阻火器的条件和要求。 3.4和7.3.5；e） 澄清第12f）条中关于燃烧时间的信息要求；f） 对7.1和14.1中的施工要求增加许可，以通过进行流量试验代替目视检查；g） 增加试验结果评估流程图，作为附录D

This document specifies the requirements for flame arresters that prevent flame transmission when explosive gas-air or vapour-air mixtures are present. It establishes uniform principles for the classification, basic construction and information for use, including the marking of flame arresters, and specifies test methods to verify the safety requirements and determine safe limits of use. This document is applicable to pressures ranging from 80 kPa to 160 kPa and temperatures ranging from -20 °C to +200 °C. This document does not apply to the following: - external safety-related measurement and control equipment that might be required to keep the operational conditions within the established safe limits; - flame arresters used for explosive mixtures of vapours and gases, which tend to self-decompose (for example, acetylene) or which are chemically unstable; - flame arresters used for carbon disulfide, due to its special properties; - flame arresters whose intended use is for mixtures other than gas-air or vapour-air mixtures (for example, higher oxygen-nitrogen ratio, chlorine as oxidant); - flame arrester test procedures for reciprocating internal combustion engines; - fast acting valves, extinguishing systems and other explosion isolating systems; - Flame arresters used in gas detectors (those being covered for example, by IEC 60079？29？1 and IEC 62990？1). This edition cancels and replaces ISO 16852:2016, which has been technically revised. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to ISO 16852:2016: a) adaptation of the relevant IEC TC 31 requirements on standards; b) modification of the upper limit of the temperature range from 150 °C to 200 °C under the condition that T0 shall be not larger than 80 % of the auto ignition temperature of the gas-air-mixture; c) change of the term "explosion group" to "equipment group" due to editorial requirements in IEC/TC 31; d) clarification of the conditions and requirements for flame arresters whose intended operating conditions are outside the atmospheric conditions in 7.3.4 and 7.3.5; e) clarification of the requirements on the information for use in Clause 12 f) concerning the burn time; f) addition of a permission to the construction requirements both in 7.1 and 14.1 to substitute visual inspection by performing a flow test; g) addition of a flow chart for the evaluation of test results as Annex D