🔍 Key Concepts

• Design Limits of Legs Chart purpose on a jack-up or similar mobile offshore drilling unit • Difference between environmental load, variable load, and leg strength/stability • How severe storm conditions during transit affect the legs compared to operating on location

💭 Think About

• Ask yourself: In severe storm transit, what aspect of the unit’s legs is most critical—wave/wind forces, how much variable load is onboard, or the structural and stability limits of the legs themselves? • Consider what the leg design limits are intended to protect against when the unit is moving with legs elevated in heavy weather. • Which option best describes a combined consideration of whether the unit will stay upright and whether the legs can safely withstand expected forces?

✅ Before You Answer

• Verify which term from the choices is normally used to describe the structural and stability limits of jack-up legs in OEM/operating manuals. • Check if “load line” relates to hull freeboard and draft, or to leg design limits—this helps you eliminate at least one option. • Distinguish between environmental load (external forces) and variable load (changeable onboard weight like fuel, consumables, etc.) and decide which one is most directly tied to the legs’ design limits in a storm transit.