MAR602: Advanced Offshore Operations & Marine Technology
Assessment 1: Technical Investigation Report (Dynamic Positioning Systems)
- Module Code: MAR602
- Module Title: Offshore Engineering and Subsea Operations
- Assessment Title: Assessment 1 – Critical Analysis of DP Reliability and Station Keeping
- Weighting: 50%
- Word Limit: 3000 words (+/- 10%)
- Due Date: Week 9, Monday by 14:00 GMT
- Submission Method: Turnitin via Canvas/Blackboard
1. Assessment Context
Dynamic Positioning (DP) has become the operational standard for offshore supply vessels (OSVs), drillships, and shuttle tankers. However, ‘Loss of Position’ events continue to pose severe risks to subsea assets and personnel. The reliability of a DP system relies not only on the redundancy of hardware (DP Class 2/3) but significantly on the effectiveness of the Position Reference Systems (PRS), the fidelity of the Failure Modes and Effects Analysis (FMEA), and the competency of the Dynamic Positioning Operator (DPO).
Get a Custom-Written Paper Delivered to Your Inbox
Our subject-specialist writers craft plagiarism-free, rubric-matched papers from scratch — available for students in Australia, UK, UAE, Kuwait, Canada and USA.
You are an Operations Manager for a major offshore contractor. You have been tasked with auditing the station-keeping capabilities of a DP Class 2 Diving Support Vessel (DSV) intended for operations within the 500m zone of a fixed platform.
2. Task Description
Produce a 3000-word Technical Investigation Report evaluating the effectiveness of Dynamic Positioning in safety-critical offshore operations.
Dissertation App Writers Are Online Right Now
Thousands of students at universities from RMIT to UCL to AUM Kuwait submit with confidence using our expert writing service. Human-written, Turnitin-safe, on time.
Your report must address the following four technical requirements:
- System Architecture & Redundancy: Critically compare the redundancy concepts of DP Class 2 and DP Class 3 vessels. Specifically, analyze the risks associated with “Common Mode Failures” in open vs. closed bus-tie configurations.
- Sensor Fusion & Reference Systems: Evaluate the limitations and failure modes of three distinct Position Reference Systems (e.g., DGNSS, Hydroacoustic HPR, and Laser/Fanbeam). Discuss how signal shadowing and scintillation can degrade system weighting and voting logic.
- Operational Risk Management: Using the IMCA M 117 guidelines, critique the effectiveness of the Activity Specific Operating Guidelines (ASOG) and the Critical Activity Mode of Operation (CAMO) in bridging the gap between engineering design and operational reality.
- Human Factors: Analyze the role of the DPO in interpreting “capability plots” and “footprint plots” during deteriorating weather conditions. Discuss the “human-in-the-loop” latency issues during a drive-off scenario.
3. Formatting and Submission Guidelines
- Format: Professional Industry Report (PDF).
- Structure: Executive Summary, Technical Analysis (broken down by the points above), Risk Assessment Matrix, Conclusion, References.
- Referencing: Harvard Style. Minimum 20 references, including specific IMCA guidelines (e.g., M 103, M 117) and IMO MSC Circulars (MSC.1/Circ.1580).
- Figures: You are expected to include annotated diagrams of DP system layouts and capability plots.
4. Grading Rubric (Marking Criteria)
| Criteria | Fail (<50%) | Pass (50-59%) | Credit/Distinction (60-79%) | High Distinction (80%+) |
|---|---|---|---|---|
| Technical Depth (30%) | Fundamental misunderstanding of DP classes or redundancy. | Descriptive overview of DP 2/3 without critical engineering analysis. | Detailed analysis of bus-tie configurations and failure modes. | Expert-level synthesis of control loops, Kalman filtering, and common mode failure risks. |
| Operational Analysis (30%) | Ignores ASOG/CAMO protocols. | Generic discussion of safety without specific IMCA references. | Clear application of operational guidelines to the specific vessel type. | Comprehensive critique of the interface between FMEA findings and real-time decision support tools (ASOG). |
| Sensor & System Evaluation (20%) | Listing of sensors without failure analysis. | Basic explanation of DGNSS or Acoustics. | Solid evaluation of sensor limitations and voting logic. | Nuanced discussion of signal degradation, scintillation, and multi-path errors affecting station keeping. |
| Communication & Structure (20%) | Unprofessional format. Poor referencing. | Standard report format. Some referencing errors. | Professional layout. Accurate Harvard referencing. | Publishable industry standard. Flawless integration of technical diagrams and citations. |
5.
The integrity of a DP Class 2 system is predicated on the principle that no single point of failure (associated with active components) should result in a loss of position. However, the reliance on DGNSS as a primary reference system introduces a vulnerability to ionospheric scintillation, particularly in equatorial regions such as West Africa. To mitigate this, a robust weighting logic within the DP Controller must prioritize independent reference principles, such as Hydroacoustic Position Reference (HPR) or Taut Wire systems, when Dilution of Precision (DOP) values degrade. Furthermore, the operational transition from a ‘Green’ to ‘Blue’ or ‘Yellow’ status within the ASOG must be instantaneous. A critical failure often observed in drive-off scenarios is the DPO’s hesitation to deselect a faulty thruster due to cognitive overload caused by alarm flooding. As noted by the International Marine Contractors Association (IMCA, 2023), the implementation of a closed bus-tie configuration, while fuel-efficient, significantly increases the risk of a blackout if the protection relays fail to isolate a short-circuit fault rapidly, thereby compromising the vessel’s worst-case failure design intent (WCFDI).
6. Recommended Learning Resources
- Bray, D. (2020) Dynamic Positioning for Engineers and Operators. London: The Nautical Institute.
- Chae, C.J. and Kim, M. (2023) ‘Analysis of Dynamic Positioning Incidents and Human Factors in Offshore Operations’, Journal of Marine Science and Engineering, 11(4), p.782. https://doi.org/10.3390/jmse11040782
- International Marine Contractors Association (IMCA) (2022) Guidance on the Design and Operation of Dynamic Positioning Systems (IMCA M 103). London: IMCA. Available at: https://www.imca-int.com/publications/103/
- International Maritime Organization (IMO) (2017) Guidelines for Vessels and Units with Dynamic Positioning (DP) Systems. MSC.1/Circ.1580. London: IMO.
- Sorensen, A.J. (2018) ‘Marine Cybernetics: Control Systems in Offshore Operations’, Annual Reviews in Control, 40, pp.178-192.