Which statement is NOT a characteristic of a compressed gas tube trailer?

• A. The manifold is enclosed at the rear
• B. It has permanent markings for the material or ownership
• C. It carries compressed gases
• D. The manifold is located at the front and not enclosed

Answer: (D)

The key thing being tested is understanding how a compressed gas tube trailer is designed and labeled for safe operation. A tube trailer carries gas-filled tubes in a rack, and the gas from those tubes is collected through a manifold. That manifold is placed at the rear of the trailer and is enclosed to protect the connections and reduce the risk of leaks or damage during transport. The trailer also carries permanent markings that identify the material inside and the owner, which helps with proper handling, regulatory compliance, and emergency response. It also plainly carries compressed gases.

Saying that the manifold is located at the front and not enclosed conflicts with how these trailers are built to protect the system and operators, so that statement is not a characteristic of a compressed gas tube trailer.