These requirements cover combination liquid and dry-type flashback arresters and combination flashback arresters with back-pressure check valves for use with oxygen and fuel gas consuming equipment. Devices covered by these requirements are intended for use in supply piping@ regulator outlets@ or torch inlets in accordance with the following standards: a) Standard for the Design and Installation of Oxygen-Fuel Gas Systems for Welding@ Cutting and Allied Processes@ NFPA 51 and b) Safety in Welding and Cutting and Allied Processes@ AWS Z49.1.