🔍 Key Concepts
• 46 CFR Subchapter O – regulations for bulk liquid hazardous materials on tank vessels
• Cargo-specific requirements in the Chemical Data Guide or Material Safety Data Sheets (MSDS/SDS) for crotonaldehyde, phosphoric acid, and morpholine
• Differences between protective clothing, material compatibility, segregation/barriers, and warning sign legends
💭 Think About
• For option A, think about what is normally required for sampling strong acids: is eye/face protection alone usually enough, or are additional items like gloves and apron typically required?
• For option B, consider why aluminum, copper, and zinc might be restricted with certain chemicals. Are they always prohibited for all cargoes, or only for some specific incompatibilities?
• For option C, recall what "two barriers" segregation usually applies to. Is that standard for all incompatible cargoes, or only for certain classes or combinations?
• For option D, think about which types of cargoes require the specific legend "cancer hazard" on warning signs. Do all toxic/irritant chemicals need that wording, or only those with proven carcinogenic properties?
✅ Before You Answer
• Check PPE (personal protective equipment) requirements for phosphoric acid sampling – does it list only goggles/face shield, or more than that?
• Verify in the compatibility tables or cargo-specific notes whether aluminum, copper, and zinc are explicitly prohibited in all valve parts in contact with each of these cargoes, or only some of them.
• Review signage requirements in 46 CFR 153 for bulk hazardous liquids to see which cargoes require additional warning legends such as "cancer hazard" and whether any of these three cargoes are on that list.