What does a star next to the date on a gas cylinder indicate?

The presence of a star next to the date on a gas cylinder indicates that a 10-year listing is allowable for the cylinder. This symbol serves as an important regulatory marker which signifies that the cylinder has undergone specific safety checks and is approved for an extended period of use, typically 10 years, beyond its initial testing date.

In many jurisdictions, the markings and symbols on gas cylinders are regulated to ensure safety standards are maintained. The star indicates compliance with those standards, assuring users that the cylinder has been inspected and deemed safe for use over the extended timeframe. Understanding this marking is crucial, as it helps ensure that cylinders remain within regulations and possess the necessary safety evaluations required in medical gas storage and handling.