🔍 Key Concepts

• LNG spherical (Moss) containment systems and why their shape matters for structural support and sloshing loads • The purpose of a secondary barrier in gas carrier design under the IGC Code • How tank height and deckhouse/forecastle arrangements affect visibility over the bow on gas carriers

💭 Think About

• Ask yourself: Is the main safety/design benefit of a spherical LNG tank more about what happens if the primary barrier leaks, or about how high/low the tanks sit relative to the bridge? • Consider whether spherical tanks typically improve, reduce, or have little effect on forward visibility compared with prismatic tanks on modern gas carriers. • Think: Which of the listed features (if any) is a recognized design advantage mentioned in gas carrier design references (IGC Code discussions, training manuals)?

✅ Before You Answer

• Verify whether Moss-type spherical tanks require a full liquid-tight secondary barrier, or if they rely on a different containment philosophy (e.g., partial drip trays and hold space monitoring). • Check if good visibility over the bow is actually cited in standard references as a design advantage of spherical tanks, given their above-deck profile. • Before choosing a combined option (like 'both' or 'neither'), be sure you can independently justify whether each individual statement (A and B) is correct or incorrect.