CDL Hazardous Materials Endorsement (HME)Loading and Unloading Hazardous MaterialsMedium
When loading cylinders of compressed gas onto a vehicle, what is the correct orientation for the cylinders?
- AThey should be loaded in a vertical position, protected from falling, or in a horizontal position, secured against rolling.
- BThey should always be loaded in a horizontal position to distribute weight evenly.
- CThey should be loaded in a horizontal position with valves facing the rear of the vehicle.
- DThey should always be loaded in a vertical position to prevent valve damage.
Show answer & explanationAnswer & explanation
Correct answer: A. They should be loaded in a vertical position, protected from falling, or in a horizontal position, secured against rolling.
Compressed gas cylinders can be transported either vertically or horizontally. If vertical, they must be protected from falling. If horizontal, they must be secured against rolling. The key is to prevent movement and valve damage, regardless of orientation.
Why the other options are wrong
- B. Horizontal is acceptable, but 'always' is incorrect, and securing against rolling is paramount, not just weight distribution.
- C. While valves facing rear might be a practice, the primary concern is securing against rolling, not a specific direction.
- D. Vertical is acceptable, but 'always' is incorrect, and protection from falling is the key, not just valve damage.
Compressed Gas Cylinder Orientation
Compressed gas cylinders can be transported either vertically or horizontally, provided specific securement precautions are met for each orientation.
- Vertical: protected from falling.
- Horizontal: secured against rolling.
- Prevents movement and valve damage.
Memory trick: Cylinders stand tall or lie flat, just keep them locked in place.