Gas Cylinder Size Identification
BOC cylinder sizes are denoted by a letter code. The gas content of cylinders is measured in cubic metres, litres or kilograms. If volume unit is given, it refers to standard temperature and pressure of 15°C (101.3 kPa). The illustration below is provided to give an approximate indication of cylinder heights in relation to the average person.
Common Layout of Shoulder Labels
The gas name label, stencilling or component details should always be used to identify the contents of cylinders. Labels must not be removed or defaced. Any cylinder without a gas name label should be returned to the supplier for replacement.
| 1 | Dangerous Goods Classification |
| 2 | Contents of cylinder at standard temperature and pressure (15°C @ 101.3 kPa) |
| 3 | BOC cylinder size |
| 4 | United Nations numbering system for safe handling, transport and storage |
| 5 | Gas name and grade |
| 6 | Nominal filling presure at standard conditions (for permanent gas) |
| 7 | Caution - indicated major hazards* |
| 8 | General safety information* |
* Always refer to Material Safety Data Sheets (MSDS)