Before deballasting to survival draft in the...

Question 1 of 2707066636ee728f7522a1c51785b

Before deballasting to survival draft in the event of predicted heavy weather, the DEEP DRILLER Operations Manual recommends that the mooring lines be slacked __________.

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Question 1 of 27070

Before deballasting to survival draft in the event of predicted heavy weather, the DEEP DRILLER Operations Manual recommends that the mooring lines be slacked __________.

🔍 Key Concepts

• Heavy weather procedures for moored MODUs (Mobile Offshore Drilling Units) • The purpose of survival draft and how it affects vertical and horizontal motions • How much slack is typically needed in mooring lines to allow for heave, surge, and pitch without overloading the lines

💭 Think About

• Think about what happens to a unit’s motion when you deballast to survival draft in heavy seas—will the motions increase or decrease, and how does that affect mooring tension? • If the lines are left too tight, what risk does that pose to the anchors and fairleads as the unit heaves and surges? • Looking at the options, which amount of slack seems most consistent with allowing safe movement in heavy weather without completely compromising position-keeping?

✅ Before You Answer

• Verify what the Operations Manual is trying to prevent: parted lines, dragged anchors, or excessive offset. • Consider whether just 10 feet of slack would realistically be enough motion allowance for a large offshore drilling unit in heavy seas. • Compare the larger values (20, 30, 40 feet) and think about which is a typical, practical adjustment rather than an extreme that might let the unit move too far.