On the COASTAL DRILLER, placing the rotary 34 feet aft of the transom and two feet to starboard of the centerline, limits the maximum hook load to __________.
⢠Leverage and moment arms when the rotary table is offset from the vesselâs centerline ⢠How distance aft of the transom and offset to starboard affect allowable hook load on a MODU (Mobile Offshore Drilling Unit) ⢠Structural or stability limits that may be imposed when loads are carried off-center
⢠How does moving the rotary farther aft change the bending moment on the hull structure compared with a more central position? ⢠What effect does a sideways (starboard) offset of the rotary have on the maximum safe hook load and why would this tend to increase or decrease the limit? ⢠Among the answer choices, which values seem more consistent with a reduced allowable load due to increased moment, and which seem more like âfull rated capacityâ numbers?
⢠Verify how moment = load à horizontal distance from the support point applies to this problem ⢠Consider whether placing the rotary 34 feet aft and 2 feet to starboard would increase or decrease the structural moment compared to a rotary placed near the centerline ⢠Before choosing, ask: does this new placement likely require a significant derating, a moderate derating, or only a small reduction from the design hook load?
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