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?
⢠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
⢠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?
⢠Confirm you are using the correct water depth (700 ft) and total chain length (3,150 ft) for line #4 ⢠Verify youâre 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 âlying on bottomâ plus âsuspended in the water columnâ cannot exceed the total 3,150 ft of chain
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