While anchored in 700 feet of water, 3,150...

Question 1 of 2707066636ee728f7522a1c5174c3

While anchored in 700 feet of water, 3,150 feet of chain is deployed for line #4. Tension on that line is 200 kips. According to the DEEP DRILLER Operating Manual, how much of that chain lies along the bottom?

Back

Question 1 of 27070

🔍 Key Concepts

• Anchor line geometry when a vessel is anchored in deep water • Relationship between water depth, total chain length, and the horizontal (lying on bottom) vs. suspended portion of the chain • How the operating manual tables/graphs are typically read for specific line tension and water depth

💭 Think About

• Given the water depth and total chain length, what part of the chain must at least be off the bottom just to reach from the fairlead to the seabed? • How would increasing tension in the line affect how much chain is lifted off the bottom versus lying flat along the seabed? • If you had a table or graph in the operating manual with axes such as tension and water depth, how would you interpolate to find the corresponding length of chain on the bottom?

✅ Before You Answer

• Confirm you are using the correct water depth (700 ft) and total chain length (3,150 ft) for line #4 • Verify you’re reading the correct line number / mooring leg data from the DEEP DRILLER Operating Manual (some manuals have different curves for different lines) • Double-check that the value you choose is physically reasonable: the sum of ‘lying on bottom’ plus ‘suspended in the water column’ cannot exceed the total 3,150 ft of chain