The e-BDN Says 1,400 Tonnes. The Ship Says 1,372. Follow the Dispute.
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Following a Bunker Quantity Dispute Through the Data
The document is authenticated. The mass-flow meter has a ticket. The chief engineer's tank reconciliation is 28 tonnes short. Digital bunkering makes the evidence cleaner, but it does not make disagreement disappear.
The bunker operation is finished. The electronic delivery note records 1,400 tonnes. The receiving vessel's post-bunker calculation says only 1,372 tonnes arrived.
That 28-tonne difference is worth $18,200 at $650 per tonne. But the e-BDN is not the measuring instrument, and the ship's sounding calculation is not automatically the custody-transfer figure either.
The dispute now becomes a race through the evidence chain: meter data, seals, start and finish readings, tank measurements, transfers, line clearing, digital records and the signatures attached to them.
The e-BDN proves what was recorded. It does not independently prove what entered the ship.
Digitalisation strengthens the record. It does not collapse three separate questions into one.
Mass-flow meter
In Singapore MFM deliveries, the bunker tanker's approved metering system is the basis for the delivered quantity recorded on the BDN.
Electronic BDN
The e-BDN records the transaction digitally and creates an authenticated, verifiable document trail.
Ship reconciliation
Tank soundings or gauges provide an independent reason to investigate when the vessel's calculated receipt differs materially.
Follow the 28 tonnes
Supplier record shows 1,400 tonnes
The post-delivery documentation includes the e-BDN, MFM-related documentation and bunker metering ticket. The chief engineer reviews the digital documents before final sign-off.
The vessel calculates 1,372 tonnes received
The first response is measurement verification rather than accusation. Receiving tanks are checked again and calculations are reviewed for tank tables, temperatures, trim, list and any transfers or consumption during the operation.
The dispute moves upstream to the custody-transfer data
Start and end totalizer readings, the bunker metering ticket, meter status, seal checklist, piping arrangement and available delivery-profile data become the next layer of evidence.
Seals and data matter as much as the final number
An intact measurement chain strengthens the meter result. Broken seals, unexplained configuration changes, missing logs or inconsistent totalizer figures materially change the investigation.
The protest becomes part of the digital record
If the difference remains unresolved, the dispute should be recorded contemporaneously under the applicable port and contractual procedure. In Singapore's digital process, the Letter of Protest workflow can be handled electronically.
The winner is usually the stronger evidence chain
The eventual commercial argument turns on which measurement can be supported by contemporaneous records rather than which number was entered into a spreadsheet later.
A 28-tonne discrepancy is large enough to stop treating it as rounding noise
Before calling it a short delivery, six explanations have to survive scrutiny
Tank measurement error
Sounding, ullage, gauge calibration, tank-table interpolation, trim, list or temperature assumptions can move the vessel's calculated receipt.
Fuel moved onboard
Transfers between tanks, purifier use, boiler consumption or other activity during the bunkering window can corrupt a simple before-and-after comparison.
Line contents
Hose and pipeline condition, draining, stripping and the agreed line-clearing procedure can influence the reconciliation if the two sides are not comparing the same boundary.
MFM integrity issue
Seal condition, zero verification, configuration, operating range, piping integrity and the raw delivery profile determine how much confidence can be placed in the meter total.
e-BDN data error
The physical delivery may be correct while the quantity entered or transmitted into the digital document is wrong. Singapore provides a correction procedure for this case.
Actual short delivery
Once measurement and documentation explanations are eliminated, the remaining question is whether the contractual quantity physically transferred was less than recorded.
The dispute is really a hierarchy of evidence
| Evidence | Role | What it can establish | What it cannot establish alone |
|---|---|---|---|
| MFM metering ticket | Primary | Quantity recorded by the approved custody-transfer metering system. | Whether system integrity was maintained throughout the operation. |
| Start / end readings | Primary | Meter totalizer change over the transfer. | Whether every tonne represented by the reading entered the receiving ship. |
| Seal checklist + piping | Integrity | Whether the approved measurement pathway remained physically secured. | The ship's own received quantity. |
| Delivery profile / data log | Diagnostic | Changes in operating conditions, tank switching, line clearing and flow behavior. | A contractual conclusion without the rest of the records. |
| Ship tank reconciliation | Cross-check | Independent indication that the vessel's tanks do not reconcile with the delivery figure. | Automatic invalidation of an approved MFM quantity. |
| e-BDN verification | Authentication | Whether the digital record matches the transaction data submitted to the authority. | Independent physical measurement of the bunker transfer. |
| Surveyor statement | Corroboration | Contemporaneous third-party observations and measurements. | A substitute for missing primary measurement evidence. |
If the digital note is wrong, the digital trail has to change with it
An e-BDN error is not silently edited away
Singapore's published FAQ says that when an error is identified after submission, a new e-BDN should be generated, signed again and submitted to MPA, with MPA informed of the change.
Bunker Quantity Dispute Console
Change the delivery figures, fuel value and selected tolerance. Then build the evidence file. The tool separates the size of the discrepancy from the strength of the evidence supporting it.
Is this a document problem, a measurement conflict or a real shortage?
This model does not decide liability. It identifies the size of the discrepancy, where the evidence conflicts and which records are still missing.
Material discrepancy. The measurement chain should be reconciled before commercial closeout.
Priority evidence: obtain the raw delivery profile and independently recheck the vessel tank reconciliation.