These trailers contain several pressurized vessels, are constructed of steel, have pressures ranging from 2000-6000 psi, and the piping and controls are located on the rear. What are they called?

• A. Tube module
• B. IMO Type 5
• C. Compressed gas tube trailers
• D. Cryogenic liquid tank

Answer: (C)

The situation describes compressed gas tube trailers. They carry several pressurized gas cylinders arranged in steel tubes along the trailer, with the piping and control valves located at the rear for accessibility and safety. Pressures in the range of 2000–6000 psi are typical for these high‑pressure gas tubes, which distinguishes them from other types of gas transport. This setup is different from cryogenic liquid tanks, which store very cold liquids in insulated tanks and have different equipment and appearance. The term “tube trailer” here specifically refers to the high‑pressure gas tubes, making compressed gas tube trailers the correct name.