A driver is transporting a bulk quantity of UN1075, Liquefied Petroleum Gas (LPG), a Class 2.1 (Flammable Gas). When must the driver attend the cargo tank during loading or unloading?
- AContinuously from the time the loading/unloading begins until it is completed.
- BWhen the vehicle is within 25 feet of any building.
- COnly during the initial connection and final disconnection of hoses.
- DOnly when the cargo tank is more than 50% full or less than 50% empty.
Show answer & explanationAnswer & explanation
Correct answer: A. Continuously from the time the loading/unloading begins until it is completed.
Federal regulations (49 CFR 177.834(i)) state that a driver or a qualified representative must attend a cargo tank motor vehicle during the entire loading and unloading operations of flammable liquids, flammable gases, and certain other hazardous materials. This continuous attendance ensures immediate response to any issues.
Why the other options are wrong
- B. Proximity to buildings is a factor for parking, but attendance during loading/unloading is a separate, continuous requirement regardless of location.
- C. Initial connection and final disconnection are critical, but continuous attendance is required for these materials.
- D. The percentage filled/empty does not dictate the attendance requirement; it's continuous throughout the operation.
Cargo Tank Attendance (Flammable Gas/Liquid)
Drivers or qualified personnel must attend a cargo tank motor vehicle continuously from the beginning until the completion of loading or unloading operations for flammable liquids, flammable gases, and certain other hazardous materials.
- Applies to Class 2.1 (Flammable Gas) and Class 3 (Flammable Liquid).
- Attendance must be continuous.
- Ensures immediate response to spills, leaks, or other incidents.
- Regulations in 49 CFR 177.834(i).
Memory trick: Don't Leave the Tank Alone! Watch It Fill, Watch It Drain, No Breaks, No Strain!