The full period of motion of the DEEP DRILLER while tripping is 10 seconds and the maximum pitch angle as seen on the inclinometer is 4 degrees. From the standpoint of critical motion, the motion is __________.
• Critical motion criteria for drilling units (how period of motion and maximum pitch/roll affect operations) • Relationship between period of motion (seconds) and how "quick" or "slow" the vessel is moving • How maximum pitch angle limits are used to decide if tripping operations are safe or must be modified/suspended
• Compare a 10‑second period: is this a quick, jerky motion or a slower, gentler motion? How would each affect drill pipe in the well? • Think about a 4° pitch angle: is this close to typical operating limits, or well below what is usually considered dangerous for tripping? • For each choice, ask: does the described action match a relatively mild motion condition, or something much more severe?
• Be clear on whether 4° pitch is considered small, moderate, or extreme for offshore units during tripping • Recall if standby or survival draft are only used when motions are approaching design or safety limits, not just normal sea states • Check whether moving setback to pipe racks is a response to very serious motion or a more precautionary, moderate‑motion condition
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