DPO Cost Estimation 3 — Questions and Answers
Question 1: What is the primary purpose of including a 'contingency reserve' in a DP project cost estimate?
- To fund crew bonuses upon successful project completion
- To cover identified risks with uncertain probability or impact that could affect cost (Correct answer)
- To pay for planned maintenance already scheduled during the project
- To offset the vessel owner's profit margin
Correct answer: To cover identified risks with uncertain probability or impact that could affect cost
Contingency reserves address known unknowns — identified risks whose likelihood or cost impact cannot be precisely predicted at estimate time.
Question 2: In DP project budgeting, 'spread cost' refers to:
- The cost of spreading mooring lines across the seabed anchor pattern
- The combined daily cost of all vessels, equipment, and personnel required for the operation (Correct answer)
- Fuel cost distributed across each thruster unit
- The overhead cost allocated to the project from the contractor's head office
Correct answer: The combined daily cost of all vessels, equipment, and personnel required for the operation
Spread cost is the total daily expenditure for the complete offshore operation including support vessels, dive systems, ROVs, and all personnel.
Question 3: A DP operator notices the vessel is using 30% more fuel than the baseline estimate during operations. Which corrective action has the most direct positive impact on cost?
- Reducing the number of crew on watch
- Optimizing heading to minimize environmental loading on the vessel (Correct answer)
- Switching to a higher-viscosity fuel grade
- Increasing thruster RPM to improve position accuracy
Correct answer: Optimizing heading to minimize environmental loading on the vessel
Heading optimization aligns the vessel's lowest drag profile to the dominant environmental force, reducing required thruster output and fuel burn.
Question 4: How does crew change cost factor into a long-duration DP project budget?
- It is negligible because crew fly on commercial airlines at standard fares
- It includes helicopter or boat transfers, accommodation, and travel time that occur at regular rotation intervals (Correct answer)
- It is the sole responsibility of individual crew members under maritime law
- It only applies when crew are replaced due to illness or injury
Correct answer: It includes helicopter or boat transfers, accommodation, and travel time that occur at regular rotation intervals
Crew change logistics — helicopter flights, vessel transfers, and shore-side accommodation — are recurring costs that must be built into the project schedule and budget.
Question 5: Which of the following best describes an 'opportunity cost' when selecting a DP vessel for a project?
- The discount offered by the vessel owner for a long-term charter
- The revenue lost because the selected vessel is unavailable for other work during the project (Correct answer)
- The cost savings achieved by choosing a lower DP class vessel
- The premium paid for urgent vessel mobilization
Correct answer: The revenue lost because the selected vessel is unavailable for other work during the project
Opportunity cost represents the foregone alternative use of the vessel or capital, which project managers consider when evaluating vessel selection against market alternatives.
Question 6: When a DP incident results in unplanned excursion from position, what is typically the most significant cost consequence?
- Increased insurance deductible only
- Potential damage to subsea infrastructure, lost production, and re-mobilization costs (Correct answer)
- Additional crew overtime for the next watch
- Mandatory fuel flush of all thruster systems
Correct answer: Potential damage to subsea infrastructure, lost production, and re-mobilization costs
A drive-off or drift-off can cause catastrophic damage to risers, umbilicals, or wellheads, resulting in costs far exceeding the original project value.
Question 7: What is a 'lump-sum turnkey' contract structure in the context of DP operations cost risk?
- The client pays a fixed total price and the contractor absorbs cost overruns (Correct answer)
- The client reimburses all actual contractor costs plus an agreed fee
- The contract price adjusts monthly based on fuel index fluctuations
- The vessel owner and client share all cost variances 50/50
Correct answer: The client pays a fixed total price and the contractor absorbs cost overruns
Under a lump-sum turnkey contract the contractor guarantees delivery for a fixed price, assuming all schedule and cost risk beyond defined force majeure events.
DPO Cost Estimation 3
What is the primary purpose of including a 'contingency reserve' in a DP project cost estimate?