Tanker vehicle inspection, equipment, and loading/unloading
What this domain tests
The tanker inspection, equipment, and loading/unloading domain checks whether you can verify a cargo tank before movement, recognize tank-specific equipment, and control product transfer without spills or overfills. Expect pre-trip items, valve and vent checks, grounding/bonding, outage, and safe transfer procedures.
Core rules
- Inspect the tank shell, supports, bulkheads, baffles, manholes, vents, piping, valves, hoses, gaskets, and emergency shutoff. Look for cracks, leaks, loose fittings, missing caps, and damaged placards.
- Confirm the tank is the correct specification for the product and that capacity, compartment gauges, and weight limits are understood.
- Ground and bond before loading flammable liquids, and keep the bond connected until transfer ends.
- Set the parking brake, chock wheels, and verify the receiving tank has room before unloading.
- Never overfill. Leave the required outage/ullage for expansion; use the tank gauge but verify by an independent method when procedures require it.
Worked example
A 5,000-gallon compartment has a company-required 1% outage. Maximum product is 5,000 × 0.99 = 4,950 gallons. The gauge shows 4,960 gallons. That is 10 gallons over the permitted maximum, so stop loading and arrange transfer. Reasoning: outage is not wasted capacity; it is expansion space. The gauge alone does not prove legal fill.
Traps
Do not treat a dome cover as a pressure cap or open it before relieving pressure. Do not skip bonding because a hose is connected. Do not leave a transfer unattended unless the system has an automatic shutdown and procedures permit it. Do not confuse a tank’s nominal capacity with its maximum product load.