Tankerman Practice Questions

1. During a cargo transfer on a tank vessel, the Person-In-Charge (PIC) is primarily responsible for:

• A.Navigating the vessel
• B.Supervising and being in charge of the cargo transfer operation✓
• C.Standing the engine room watch
• D.Maintaining the cargo pumps in port only

Why: The Person-In-Charge directs and is accountable for the safe conduct of the transfer — connecting, monitoring, and disconnecting — and must remain in charge throughout the operation.

2. Drip pans or containment under cargo hose connections are required to:

• A.Catch and contain minor leaks and drips at the manifold✓
• B.Cool the cargo
• C.Hold spare gaskets
• D.Provide a step for the crew

Why: Fixed or portable containment under each manifold connection catches small leaks and drips so they do not reach the deck scuppers and discharge overboard.

3. During initial loading of a cargo tank, the loading rate should be:

• A.Kept low until the fill pipe is submerged to reduce static buildup✓
• B.Set at maximum to minimize transfer time and vapor generation
• C.Adjusted based solely on the receiving terminal's pump capacity
• D.Maintained constant throughout the loading operation

Why: Starting at a low loading rate until the fill pipe is submerged minimizes splash-filling, which generates static electricity that can ignite flammable vapors. This practice is specified in industry standards and OCIMF guidelines.

4. Which of the following petroleum cargoes presents the GREATEST fire hazard due to its extremely low flash point?

• A.Crude oil with a flash point below -18°C (0°F)✓
• B.Fuel oil No. 6 with a flash point above 60°C (140°F)
• C.Diesel fuel with a flash point of approximately 52°C (125°F)
• D.Lubricating oil with a flash point above 93°C (200°F)

Why: Crude oil with a flash point below -18°C (0°F) gives off ignitable vapors at ambient temperature, making it the greatest fire hazard during loading and discharge — fire hazard rises as flash point falls. Under 46 CFR 30.10-22 (Subchapter D), such a cargo is a Grade A or B liquid (flash point below 73°F/22.8°C), the most volatile grades requiring the strictest vapor control; the other cargoes have far higher flash points (Grades D–E). (Note: 'Class I' flammable-liquid terminology comes from NFPA 30/OSHA, not 46 CFR.)

5. Under 46 CFR Part 30, which of the following vessels is classified as a 'tank vessel'?

• A.A vessel constructed or adapted to carry liquid cargo in bulk in tanks that are part of the vessel's structure✓
• B.Any vessel carrying packaged liquid chemicals in drums or containers
• C.A vessel equipped with portable tanks used exclusively for ballast water
• D.Any vessel carrying more than 10 barrels of petroleum products as stores

Why: Under 46 CFR 30.10-1, a tank vessel is one constructed or adapted to carry liquid cargo in bulk in tanks that are integral to the vessel's structure. Vessels carrying packaged liquids or portable containers do not meet this definition.