CDL Hazardous Materials Endorsement (HME)Loading and Unloading Hazardous MaterialsMedium
A facility is loading a cargo tank with a hazardous material. What is the primary purpose of bonding the cargo tank to the loading rack during the transfer operation?
- ATo provide a physical connection for emergency stop systems.
- BTo equalize electrical potential and prevent static discharge.
- CTo ensure the cargo tank is properly grounded to the earth.
- DTo prevent the vehicle from rolling away during loading.
Show answer & explanationAnswer & explanation
Correct answer: B. To equalize electrical potential and prevent static discharge.
Bonding is the process of connecting two or more conductive objects to ensure they are at the same electrical potential. During hazardous materials transfer, bonding the cargo tank to the loading rack prevents static electricity buildup and discharge, which could ignite flammable vapors.
Why the other options are wrong
- A. Emergency stop systems typically use separate electrical or pneumatic connections.
- C. Grounding connects to the earth; bonding connects two objects to each other to equalize potential.
- D. Wheel chocks and brakes prevent rolling, not bonding.
Cargo Tank Bonding Purpose
The primary purpose of bonding a cargo tank to the loading rack during hazardous materials transfer is to equalize electrical potential and prevent static electricity discharge.
- Prevents static electricity buildup.
- Reduces risk of ignition of flammable vapors.
- Distinct from grounding, but often used in conjunction.
Memory trick: Bond for Balance, Static Silence.