Question 53 TV01 - Towing Vessels - Oceans or Near Coastal

The Correct Answer is B. **Explanation of why option B ("Two B-II or post 2017 Two 40-B:C extinguishers") is correct:** The requirements for fire extinguishers on barges engaged in transferring flammable or combustible liquids are detailed in US Coast Guard regulations, specifically 46 CFR Subchapter D (Tank Vessels) and Subchapter I (Cargo and Miscellaneous Vessels). 1. **Vessel Type and Size:** The vessel is an unmanned tank barge (90 GT) engaged in transfer operations. 2. **Transfer Operations Requirement:** According to 46 CFR 35.30-1, during the transfer of Grade A, B, or C flammable liquids, the regulations require additional fire-fighting equipment be ready at the deck level near the cargo manifolds. 3. **Specific Quantity and Type:** The requirement (formerly outlined in 46 CFR 35.30-20 and often referenced in operational instructions for tank barges during transfer) mandates **two** approved B-II (or equivalent) portable fire extinguishers must be located on the main deck during cargo transfer operations involving flammable liquids (Grades A, B, or C). 4. **Current Equivalents:** A pre-2017 B-II extinguisher has a minimum rating of 40-B:C under the current standardized rating system (post-2017). Therefore, the requirement is for Two B-II or post-2017 Two 40-B:C extinguishers. **Explanation of why each of the other options is incorrect:** * **A) Three A-II or post 2017 Three 2-A extinguishers:** This option incorrectly specifies the type of fire (Class A, for ordinary combustibles like wood/paper) and the location/quantity. While Class A extinguishers might be needed elsewhere on the barge (e.g., control shack, galley, if manned), the specific requirement for protecting the cargo transfer area from flammable liquid fires (Class B) during operations is for B-rated extinguishers. The quantity of three is also incorrect for the transfer requirement. * **C) One B-II or post 2017 One 40-B:C extinguisher:** This option correctly identifies the required class and size of the extinguisher but incorrectly states the quantity. Regulations require *two* such extinguishers to be readily available on deck during transfer operations to ensure adequate immediate response capability. * **D) None are required if it has a fixed system installed:** This is incorrect. While a fixed fire suppression system (like a CO2 or foam system) might cover the cargo tanks themselves or the machinery space, the portable extinguishers are specifically required on the **main deck near the cargo manifolds** during the transfer operation (which is a high-risk area) as a first line of defense, regardless of the presence of a fixed system elsewhere on the vessel. Fixed systems do not negate the requirement for mandatory portable extinguishers during flammable liquid transfers.