Question 65 TV01 - Towing Vessels - Oceans or Near Coastal

The Correct Answer is A. **2. Explanation of why Option A is correct:** Option A states: "The morpholine cargo must be segregated from the others by at least two barriers." This statement is correct based on chemical compatibility and MARPOL Annex II segregation requirements for dangerous liquid chemicals carried in bulk. * **Morpholine** is a strong base (alkaline) and is classified as a hazardous chemical (usually IMO Pollution Category Y or Z, and often listed as a severe hazard). * **Phosphoric Acid** is a strong inorganic acid. * **Crotonaldehyde** is an aldehyde, which can react violently with strong acids or bases. According to the International Bulk Chemical (IBC) Code (specifically the compatibility chart and related segregation tables, often codified using the Reactivity Group system): * Strong Acids (like Phosphoric Acid) and Amines/Alkaline solutions (like Morpholine) belong to incompatible reactivity groups (e.g., Group 1 and Group 18, respectively). * Chemicals belonging to incompatible groups must be segregated by at least **two barriers** (such as two cofferdams, a pump room, an empty tank, or a void space) to prevent catastrophic reactions if leakage occurs. Therefore, Morpholine (base/amine) and Phosphoric Acid (acid) must be separated by at least two barriers, making the statement regarding the segregation of morpholine from "the others" (which includes phosphoric acid) accurate under maritime transport regulations. **3. Explanation of why the other options are incorrect:** * **B) The minimum protective clothing required for taking samples of phosphoric acid is goggles or a face shield.** * **Incorrect.** Phosphoric acid (especially in commercial concentrations used in bulk shipping, usually 75% to 85%) is corrosive. Taking samples requires significantly more protective equipment than just goggles or a face shield. Minimum requirements typically include full chemical-resistant coveralls or aprons, gloves, boots, and potentially respiratory protection, in addition to eye protection, as mandated by the ship's safety manual (MSDS/SDS) and the IBC Code chapters on personnel protection. * **C) Aluminum, copper, and zinc are prohibited in all valve parts in contact with these cargoes.** * **Incorrect.** While specific materials are prohibited for certain cargoes (e.g., Morpholine is usually corrosive to copper and zinc alloys, and Phosphoric Acid can react with aluminum), the prohibition is not universal for *all* these cargoes. Phosphoric Acid, for instance, is often carried in stainless steel or rubber-lined tanks. Crotonaldehyde's compatibility profile differs from the others. A blanket prohibition on all three metals for *all* three cargoes is too broad and often false (e.g., zinc components may be compatible with one cargo but not another). Furthermore, the primary material restriction applies to tank and pipeline materials, not necessarily *all* valve components (some internal components might be compatible polymers). * **D) The required warning sign must have the legend "cancer hazard" added to it.** * **Incorrect.** While some bulk chemical cargoes are carcinogens, neither Morpholine, Phosphoric Acid, nor Crotonaldehyde is primarily classified as a human carcinogen requiring the mandatory "cancer hazard" warning sign legend under standard international shipping regulations (IMO/GHS). While crotonaldehyde is classified as a potential carcinogen (IARC Group 2B), the IBC Code warning sign requirements focus on immediate hazards (e.g., Poison, Corrosive, Flammable), not specifically cancer hazard warnings unless mandated by the specific product entry or flag state requirements, which is not the standard rule for this combination of chemicals.