The Standard specifies the maximum external leakage rates which are acceptable for equipment used for welding, cutting and allied processes. It applies to individual components which are used in the gas supply to a blowpipe from the connecting point of the hose (outlet of the cylinder valve or connecting point to a gas supply plant). It does not apply to gas supply plants.
DS/ISO 9090:1992 history
1992DS/ISO 9090:1992 Gas tightness of equipment for gas welding and allied processes