ISO 10225:2013 specifies the gas letter code to be used for marking the equipment for gas welding, cutting and allied processes, when the full name of the gas cannot be used.
Document identifier
ISO 10225:2013
Title
Gas welding equipment - Marking for equipment used for gas welding, cutting and allied processes
ISO Category
TC 44/SC 8: Equipment for gas welding, cutting and allied processes
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