Tankerman · Cargo Properties — Viscosity & Heating
Heavy/residual cargoes are heated in the tanks during a voyage primarily to:
- AIncrease their flash point
- BLower viscosity so they can be pumped✓ Correct
- CReduce their volume permanently
- DInert the tank
Explanation
High-viscosity cargoes (heavy fuel, asphalt) must be kept warm so they flow and can be discharged. Heating coils maintain a carriage temperature below the flash point but high enough for pumping; overheating risks tank/coating damage and vapor generation.
Authority: ISGOTT; cargo work
Practice the full Tankerman bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Tankerman questions
- Transfer — PIC
During a cargo transfer on a tank vessel, the Person-In-Charge (PIC) is primarily responsible for:
- Transfer — DOI
Before a transfer of oil or hazardous material begins, the PICs of the transferring and receiving facilities must complete and agree on a:
- Safety — Inert Gas
The purpose of an inert gas system on a tanker is to:
- Safety — Inert Gas
A cargo tank is generally considered properly inerted when the oxygen content is held at or below:
- Safety — Flammability
A hydrocarbon vapor/air mixture will burn only when its concentration is:
- Safety — Static
To prevent a static-electricity ignition hazard during loading of a static-accumulating cargo, the tankerman should: