Answer
A major bunker deficit (45 tonnes) requires immediate legal and operational steps before signing any delivery documents to protect the shipowner from financial loss and commercial liability.
1. Verification Phase (Rule out Shipboard Errors)
Re-Gauge All Tanks: Re-sound and re-measure every bunker tank on board using the vessel's official calibration tables. Double-check the liquid temperatures to ensure accurate volume-to-weight conversions (Volume×Density×VCF).
Barge Survey Verification: Go onboard the supply barge alongside your bunker officer. Review their opening and closing dipping records, active temperature logs, and density certificates. Look for signs of the "Cappuccino Effect" (compressed air injected into the oil to artificially expand its volume during measurement).
2. Legal Protections and Declarations
Issue a formal Letter of Protest (LoP): Draft an official Letter of Protest for "Short Delivery of Fuel Oil," specifying your exact calculated figures against the barge's claimed delivery weight.
Refuse the BDN Figure: Do not sign the Bunker Delivery Note (BDN) unless you append a clear handwritten statement stating: "Disputed Quantity: Vessel received [X] tonnes instead of [Y] tonnes listed on BDN."
Inform Stakeholders: Immediately notify the ship's Designated Person Ashore (DPA), Technical Superintendent, Charterers, and the P&I Club local representative.
3. Sampling and Operational Safeguards
Secure Witnessed Samples: Ensure that the official MARPOL sample and commercial custody transfer samples are drawn continuously at the vessel's manifold. Verify they are clearly labeled, signed, and countersigned by both you and the barge master.
Log the Dispute: Document every detail in the vessel’s Official Logbook, Engine Room Logbook, and Oil Record Book (ORB) Part I, including fuel temperatures, initial soundings, barge soundings, and the exact time the Letter of Protest was issued. Keep the disputed fuel isolated in its receiving tanks until instructions are received from the office.