File:CGC cylinder label.jpg

Diagram of the markings required on a compressed gas cylinder. The numbers reference the following: 1. DOT or ICC (prior to 1968) identification number - ex. DOT3AA2265. This identifies the cylinder material and the service pressure in pounds per square inch. 2. Cylinder serial number - ex. SG12152A. The letters "SG" may precede the serial number to indicate a specialty gas cylinder. 3. Original owner of the cylinder - ex. APROINC 4. Date of maintenance to indicate the original hydrostatic test (month/year). 5. Current owner of the cylinder will appear on the neck ring. 6. Retest markings (month, facility, year, rating, stamp). A "+" indicates the cylinder qualified for a 10 percent overfill. A star stamp on the end of the marking indicates the cylinder meets the requirements for a 10-year retest. 7. CylinderTrak bar code provides a unique identifier and is used by computer systems to track cylinders through the filling process. 8. Cylinder manufacturer's inspection marking, which is unique to the inspector. 9. Cylinder tare weight, i.e. the weight of the cylinder plus the valve without product, preceded by the letters "TW".