If you’ve ever used a compressed gas cylinder, you’ve likely noticed the markings on the shoulder of the tank. Cylinders are stamped to denote the specifications of how the cylinder was made, a unique serial number, the date the cylinder was made, the owner of the cylinder, when the cylinder will need to be retested and more. We’ve made a quick guide to show you around these markings.
1. Cylinder Specification
3. Date of Manufacture - This date (month-year) indicates the original hydrostatic test.
4. Neck Ring Identification - Displays the name of the current owner of the cylinder.
5. Retest Markings
7. Cylinder Tare (Empty) Weight
8. Gas Cylinder Label – This sticker indicates the type of gas in a cylinder, as well as its properties and hazards.
Gas service for the cylinder can be differentiated by
Do not use cylinder color in order to determine cylinder content. Gas cylinders are often color coded but because the codes are not standardized between different vendors, cylinder color cannot be safely used for gas content identification. Even though medical gas cylinders do use industry standard color coding, the paint color may change over time and with weathering, so it is only safe to identify a cylinder’s contents by its label.