What method does DOT require to indicate that containers are safe for transport and have passed visual inspections?

• A. The cylinder is stamped with the inspection date.
• B. The cylinder weight is recorded in a log.
• C. The cylinder color code is noted.
• D. The cylinder label is affixed.

Answer: (A)

DOT requires the cylinder to be stamped with the date of the last inspection. This stamping is the official, durable record that the cylinder has passed the required visual inspections (and related hydrostatic tests) and is approved for service and transport. The date on the stamp helps verify that the cylinder will be re-inspected by the due date, ensuring ongoing safety.

Recording the weight in a log isn’t a recognized indicator of inspection status. Color coding is used mainly for identifying contents, not proving a cylinder has passed inspections. A label might convey contents or safety information, but it can be replaced or missing, whereas the inspection stamp is the regulated, tamper-evident proof of compliance that DOT requires.