BUNKER DETECTIVE Survey / ROB Survey
At MCE Marine Surveyors B.V., we specialize in Bunker Detective Surveys, also known as 221B Surveys, which are designed to detect and document any concealed or undeclared bunker fuel on board a vessel. These surveys are typically requested by charterers, shipowners, or operators concerned about potential fuel losses during a charter period or bunker delivery operation.
What is a Bunker Detective Survey?
A Bunker Detective Survey is a specialized inspection carried out to investigate and reveal possible irregularities or intentional attempts to hide fuel on board. Marine fuel is a high-value commodity, and any discrepancy—whether due to mismanagement, negligence, or fraud—can result in significant financial losses. Our goal is to ensure that all fuel on board is accurately measured, verified, and reported, protecting our clients from hidden costs and operational risks.
Common Methods Used to Conceal Fuel
Our surveyors are trained to identify various deceptive techniques used to conceal bunker fuel, including:
- Short bunker deliveries by suppliers
- Use of hidden or unreported tanks and compartments
- Modified sounding pipe lengths to give false readings
- “Magic pipes” and unauthorized cross-connections
- Altered sounding tables and uncalibrated sounding tapes
- Blind acceptance of the Master’s Reported On Board (ROB) figures without independent verification
Such practices can result in substantial bunker shortages, particularly noticeable during the off-hire survey phase when the vessel is returned to the owner.
Our Methodology
Our experienced and impartial surveyors perform a full inspection of all fuel tanks, piping systems, and associated fuel handling equipment. The process includes:
- Independent sounding or ullage measurements of all tanks
- Verification of tank calibration tables and historical consumption
- Review of bunker delivery notes, logbooks, and fuel management systems
- Cross-checking fuel movement during the charter period
- Identification of possible hidden storage or structural modifications
- Issuance of a detailed bunker survey report including discrepancies, photos, and calculations
We also perform Spot Surveys, providing owners with a reliable snapshot of the actual bunker quantity on board at any given time—ideal for pre-purchase inspections, vetting, or quality control purposes.
Why Choose MCE Marine Surveyors?
- Independent and impartial service, protecting your financial and legal interests
- Proven expertise in marine fuel inspections and fraud detection
- Detailed, well-documented reports suitable for supporting disputes, claims, and audits
- Full compliance with IMO, MARPOL, and industry best practices
- Fast response and global reach, ensuring timely inspections anywhere your vessels operate
Ensure Fuel Accountability and Transparency
Bunker detective surveys are an essential tool for companies that want to ensure fuel accountability, prevent financial loss, and maintain operational integrity throughout the charter cycle. Whether you are dealing with a suspected short delivery, preparing for a vessel handover, or managing a fleet, MCE Marine Surveyors B.V. delivers the clarity and confidence you need.
Contact us today to learn more about our bunker inspection and forensic surveying services. Your fuel. Your value. Verified.
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