BS EN ISO/IEC 80079-49:2024

1 Scope 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. NOTE 1     For flame arresters with operational conditions inside the scope, but outside atmospheric conditions, see Annex E. NOTE 2     In designing and testing flame arresters for operation under conditions other than those specified above, this document can be used as a guide. This document can also be used to design any additional testing related to the specific conditions of use. This is particularly important when high temperatures and pressures are applied. The test mixtures might need to be modified in these cases. 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;