Loading, Unloading, and Special Handling
Domain 4: Loading, Unloading, and Special Handling
Loading and unloading are where tanker incidents most often start. The test expects a sequence: verify, secure, bond, load or unload, monitor, and close out.
Core rules
- Verify compatibility and cleanliness before loading. The tank must be correct for the cargo and free of incompatible residue.
- Confirm placards and shipping papers match the cargo.
- Bond and ground before loading flammable liquids. Connect the bonding cable to the tank and the ground source; keep it connected until loading is finished.
- Attend the operation. Do not leave a loading or unloading tank unattended.
- Set the parking brake, chock wheels as required, and use the emergency shutoff when needed.
- Open valves slowly and watch for leaks, hose strain, and unusual noise.
- Leave the required outage; do not top off.
- Close hatches, secure hoses, and remove grounding cables only after the transfer is complete.
Worked example
A driver arrives to load a flammable liquid and finds the bonding cable missing. The driver should not load. Reasoning: static electricity can accumulate during transfer; without bonding and grounding, a spark can ignite vapor. Being in a hurry is not a control.
Traps
Skipping bonding because the terminal is busy; leaving a tank unattended; overfilling and losing outage; failing to check that the tank is clean; disconnecting the ground before the hose is drained.