ISO 5175-2:2017规定了燃气、氧气或压缩空气安全装置的一般要求和试验，这些装置不包括歧管、气缸和/或管道出口调节器下游以及焊接、切割和相关工艺用吹管上游使用的火焰（回火）抑制器。 ISO 5175-2:2017未规定这些装置在气体系统中的位置。 ISO 5175-2:2017不适用于包含阻火器的安全装置，ISO 5175-1涵盖。

ISO 5175-2:2017 specifies the general requirements and tests for safety devices for fuel gases and oxygen or compressed air which do not incorporate a flame (flashback) arrestor used downstream of manifold, cylinder and/or pipeline outlet regulators, and upstream of blowpipes for welding, cutting and allied processes. ISO 5175-2:2017 does not specify the location of these devices in the gas system. ISO 5175-2:2017 in not applicable to safety devices which incorporate a flame arrestor, covered by ISO 5175？1.