Where is the Hydrostatic test date found on a cylinder?

The hydrostatic test date is found on the metallic name plate of a cylinder. This plate, typically attached to the cylinder, contains important regulatory and safety information, including the date when the cylinder was last tested to ensure it can safely contain gas or liquid under pressure. Hydrostatic testing is a crucial safety measure that involves filling the cylinder with water to check for leaks and verify that it can withstand its rated pressure.

The other locations mentioned, such as the manufacturer's label or the owner's manual, might provide general information about the product, but they do not typically contain specific details about the hydrostatic test date. Therefore, the metallic name plate is the authoritative source for this critical safety detail.