The COASTAL DRILLER is loaded as shown in...

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Question 1 of 2066636ee728f7522a1c51772c

The COASTAL DRILLER is loaded as shown in the Sample Load Form #1 (Rig Move). While in field transit, the wind speeds are predicted to increase above 70 knots. What would be the new KGL if the legs are lowered to the recommended value?

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Question 1 of 20

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🔍 Key Concepts

• KGL (height of the center of gravity above the keel) and how it changes when weights are moved vertically • How lowering the legs (heavy structure) affects the vertical center of gravity on a jack-up or similar unit • Using the Sample Load Form #1 (Rig Move) recommended leg position and reading/using the corresponding KGL

💭 Think About

• When a heavy weight is moved downward, does the center of gravity move up or down, and by roughly how much? • Compare the original leg position and KGL in the Sample Load Form to the recommended leg position for >70 knots. What is the relationship between those two KGL values? • Look at the possible answers: which ones are reasonable for a rig’s KGL in transit, and which look more like a near-keel or near-main-deck value?

✅ Before You Answer

• Verify from the Sample Load Form #1 what the original KGL is at the initial leg position • Find the line on the form that corresponds to the recommended leg position for high winds and note the listed KGL there • Confirm that the direction of change in KGL (up or down) when lowering the legs matches your understanding of center of gravity movement

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