🔍 Key Concepts
• Critical motion criteria for self-elevating / semi-submersible units (period vs. pitch/roll limits)
• Relationship between period of motion and maximum pitch angle when evaluating whether operations like tripping pipe are safe
• Operational responses: when you would continue, prepare to hang off, or secure/set back pipe based on motion readings
💭 Think About
• Given a 7-second period and 4° maximum pitch, ask yourself: is this motion mild, moderate, or severe for drilling/tripping operations?
• Which response (continue, prepare, or stop and secure) matches motion that is still within acceptable limits but close to concern versus motion that is clearly unsafe?
• Think about which actions are preparatory (getting ready to suspend) versus immediate (stop and secure right now), and which one applies to the motion described.
✅ Before You Answer
• Compare 4° pitch against typical critical motion angle limits used for tripping/hanging off (is 4° usually low, mid, or high?).
• Consider whether a 7-second period suggests a slow, long-period swell or a short, sharp, uncomfortable motion that affects pipe handling.
• Match each answer choice to the severity level of motion it implies: minor (continue), caution (prepare), or critical (immediately secure or change draft).