How should an empty cylinder be marked?

• A. Full
• B. MT
• C. Empty
• D. Hazardous

Answer: (B)

Marking an empty cylinder properly is essential for safety and compliance with regulations. The correct designation for an empty cylinder is "MT," which stands for "empty" or "metal tank." This marking helps distinguish empty cylinders from those that are full or pressurized, providing critical information to users who handle the cylinders.

The "MT" marking is recognized in various industries and is an important part of compliance with safety standards. It ensures that employees and safety personnel can readily identify that a cylinder does not contain any pressurized gas, which helps prevent accidents and misuse.

In contrast, markings such as "Full," "Empty," or "Hazardous" are either misleading or do not convey the specific information that "MT" does. "Full" indicates that the cylinder is pressurized and contains gas, which is the opposite of what needs to be communicated for an empty cylinder. "Empty" can be ambiguous and may not meet regulatory standards, while "Hazardous" refers specifically to cylinders containing dangerous materials rather than their pressure state. Therefore, using "MT" is the most effective and compliant way to mark an empty cylinder.