Loading, unloading, mixed loading and segregation rules
What this domain tests
Loading and unloading practice, load security, mixed loading and segregation. The exam looks for the reason behind a segregation rule, not just a table.
Core rules
- Before loading: check labels, documents, package condition, leaks, and that the vehicle is suitable. No smoking, open flames or hot work.
- Secure the load against movement with lashing, blocking or restraints. Do not drop packages.
- Ventilate when necessary; keep spill containment available.
- Segregation: the main table is for Class 1 explosives (7.5.2). Mixed loading of Class 1 with other goods is restricted. Other incompatible combinations must be separated so a leak cannot cause a reaction.
- Foodstuffs and animal feed must be separated from toxic or infectious goods.
- Unloading: check for damage, close valves, remove residues, and do not leave the vehicle unsupervised with the load.
Worked example
A loader has UN 1789 hydrochloric acid (Class 8) and UN 1402 calcium carbide (Class 4.3, water-reactive). A spill of acid on carbide could generate flammable acetylene. They must not be loaded loose together; use separate compartments or a safe separation, and keep absorbent and acid-neutralising material ready. The transport document and labels must match the actual load.
Traps
Thinking segregation always means a fixed metre distance. Loading Class 1 with other goods without checking 7.5.2. Forgetting foodstuff separation. Failing to re-check labels after a part load. Leaving a tank valve open.