1.5 Methods of identifying cylinder content:

Gas cylinders are often color coded, but the codes are not standard across different jurisdictions, and sometimes are not regulated. Cylinder color cannot safely be used for positive product identification; cylinders have labels to identify the gas they contain and the label alone should be used for positive identification (Table1.1).

14 Table 1:1 Example of a reference table for gas cylinder
Gases	USA (cylinder color)	International (Cylinder color)	State in a cylinder
oxygen	Green	White	gas
Air	Yellow	White and black	gas
Nitrous oxide	Blue	Blue	Liquid/vapor

15 Table 1:2 Example of a reference table for gas cylinder
Gases	H cylinder capacity/liter	E cylinder capacity/liter
oxygen	6000-8000	625- 800
Air	6000-8000	625 -800
Nitrous oxide	15900	1590