Determine medical gas pipe labeling and identification requirements

Steps

1. Confirm NFPA 99 requires medical gas/vacuum piping to be labeled by stenciling or adhesive markers, specifying the gas/vacuum system name (or chemical symbol), and the placement/format requirements, while the specific background/text color combinations are defined by CGA C-9 (Standard for Medical Gas Markers, referenced as NFPA 99C/CGA C-9)
2. Confirm commonly-used CGA C-9 color combinations for common gases (e.g., oxygen, nitrous oxide, medical air, carbon dioxide) against the current CGA C-9 publication rather than relying solely on secondary vendor pages, since exact color pairs should be verified at the source
3. Confirm labeling placement rules: at intervals not exceeding a specified distance along runs (commonly cited as 20 ft), at least once in or above every room served, on both sides of walls/partitions penetrated by the piping, and at least once per story height on risers
4. Confirm minimum lettering height requirements (commonly cited as 1/4 inch) and that labels must include operating pressure where a system operates at other than the standard/default gauge pressure for that gas
5. Verify all specific figures (intervals, lettering height, color pairs) against the current NFPA 99 edition and current CGA C-9 publication before finalizing labeling specifications