Question 67 TV02 - Towing Vessels - Great Lakes and Inland

The Correct Answer is A. **Explanation for A:** Verifying ullage readings (the measurement of the empty space above the liquid in a tank) is a requirement typically associated with the person in charge (PIC) or the tankerman during cargo transfer operations (loading, discharging, or stripping) to ensure the tank is not overfilled or that the required amount of cargo is being handled. However, during the transit phase, when the barge is being towed, the primary responsibility of the towing vessel operator is the safe navigation and security of the tow. The towing vessel operator is **NOT** generally required by regulation (specifically 46 CFR Subchapter D – Tank Vessels) to actively verify the cargo levels (ullage) of the secured barge tanks. **Explanation for B (Incorrect):** Keeping the barge under constant surveillance is **required** (46 CFR 35.01-1(c)). Regulations require the operator of the towing vessel to ensure that the barge is kept under observation by a deck watch at all times, especially for potential leaks or issues that would compromise safety or the marine environment. **Explanation for C (Incorrect):** Making periodic inspections of bilges (or similar spaces that can collect liquid) is **required** (46 CFR 35.01-1(c)). This is necessary to detect leaks of flammable gas or liquids, which pose a significant fire and explosion hazard. **Explanation for D (Incorrect):** Having a properly certificated tankerman or at least one credentialed officer on board the towing vessel is **required** when towing a tank barge carrying Grade A or B flammable liquids or certain flammable gases (like LPG or LNG, which fall under this classification) (46 CFR 35.01-1(d)). This ensures that there is personnel available who understands the hazards of the cargo and the necessary emergency procedures.