DPO Safety Protocols & Emergency Procedures 3 — Questions and Answers
Question 1: Which IMO resolution provides the guidelines for vessels with dynamic positioning systems?
- IMO MSC/Circ.645 (Correct answer)
- IMO SOLAS Chapter II-2
- IMO Resolution A.468(XII)
- IMO MARPOL Annex I
Correct answer: IMO MSC/Circ.645
IMO MSC/Circ.645 provides the guidelines for vessels with dynamic positioning systems and is the primary international reference for DP vessel classification.
Question 2: During emergency disconnect from a subsea wellhead, which sequence is correct?
- Close BOP, pull emergency release tool, move vessel off location (Correct answer)
- Move vessel off location, then close BOP remotely
- Sound alarm, move vessel, then close BOP
- Close BOP, sound alarm, pull riser, move vessel
Correct answer: Close BOP, pull emergency release tool, move vessel off location
Emergency disconnect requires closing the BOP first to secure the well before the emergency release tool is pulled and the vessel moves off location.
Question 3: What is the role of the 'Consequence Analysis' function in modern DP control systems?
- It calculates fuel consumption under different thruster load scenarios
- It continuously models the vessel's ability to maintain position after a simulated worst case failure (Correct answer)
- It logs all thruster outputs for post-incident analysis
- It predicts weather changes and adjusts thruster presets accordingly
Correct answer: It continuously models the vessel's ability to maintain position after a simulated worst case failure
Consequence Analysis continuously runs simulations to show whether the vessel can maintain position after a worst case failure, providing real-time go/no-go guidance.
Question 4: A DP vessel's footprint monitor shows the vessel has drifted to the edge of its allowable excursion limit. What should the DP operator do?
- Increase the DP system gain settings to pull back faster
- Alert the person in charge and consider activating the emergency response plan (Correct answer)
- Switch to a backup position reference system and continue
- Manually override the DP system and drive back to target manually
Correct answer: Alert the person in charge and consider activating the emergency response plan
Reaching the edge of the excursion limit is an emergency trigger requiring immediate notification of the person in charge and activation of emergency procedures.
Question 5: What does 'heading critical' mean in DP operations near a fixed installation?
- The vessel's heading must be maintained within a specific range to prevent contact with the installation (Correct answer)
- The vessel must maintain a constant heading to prevent DP system oscillation
- The vessel's heading cannot be changed without written permission from the client
- The vessel must point into prevailing wind at all times
Correct answer: The vessel's heading must be maintained within a specific range to prevent contact with the installation
Heading critical means that deviating from a specified heading range risks the vessel making contact with the nearby fixed installation.
Question 6: Under what condition is it permissible for a DP Class 2 vessel to operate in DP1 mode during a critical operation?
- When weather conditions are calm and risk is assessed as low
- It is never permissible; DP Class 2 vessels must always use redundant systems in critical operations (Correct answer)
- When the client gives written approval
- When one power bus is undergoing maintenance
Correct answer: It is never permissible; DP Class 2 vessels must always use redundant systems in critical operations
DP Class 2 vessels must always operate with redundant systems active during critical operations; dropping to DP1 mode removes the required redundancy.
Question 7: What is the primary purpose of conducting a 'FMEA (Failure Mode and Effects Analysis)' for a DP vessel?
- To train crew in emergency procedures using simulated failures
- To identify and document how each system failure affects DP capability so mitigations can be applied (Correct answer)
- To satisfy port state control inspection requirements
- To calculate maintenance intervals for thruster units
Correct answer: To identify and document how each system failure affects DP capability so mitigations can be applied
FMEA systematically identifies how individual equipment failures impact DP capability and documents mitigations to maintain the required redundancy level.
DPO Safety Protocols & Emergency Procedures 3
Which IMO resolution provides the guidelines for vessels with dynamic positioning systems?