Before containers bearing DOT or TC are replaced or transported, which action must be taken?

• A. Inspected
• B. Retested or replaced
• C. Sealed
• D. Refilled

Answer: (B)

Containers bearing DOT or TC marks must be retested or replaced to ensure their integrity before they are moved or put into service. These containers are pressure vessels, and regulations require a formal test (such as a hydrostatic or other approved method) to prove the container still meets safety standards, or for it to be replaced if it can’t pass. Simply inspecting the container isn’t enough to guarantee there are no hidden weaknesses, and sealing or refilling without passing the required test would not address potential failures. Replacing is appropriate when the container cannot meet the standard, while retesting confirms it still meets the standard if it’s considered serviceable.