If a gas container is unmarked, what is the appropriate response from the Certificate of Fitness holder?

Taking an unmarked gas cylinder out of service is the appropriate response due to safety protocols associated with handling potentially hazardous materials. Unmarked cylinders pose a significant risk because their contents are unknown, which could lead to dangerous situations if the gas is flammable, toxic, or otherwise harmful. By removing the cylinder from service, the Certificate of Fitness holder helps prevent any accidents related to leaks, explosions, or improper usage that could endanger themselves or others in the vicinity.

Labeling the cylinder immediately or using it cautiously are not advisable, as those actions might lead to misuse or exposure to unidentified gases. Referring to a manual may provide guidance on general protocol, but it does not address the immediate safety concern of an unmarked cylinder. Removing it from service ensures that the risks are adequately managed and that appropriate steps can be taken for proper identification and handling by qualified personnel.