Bunkering Operations and Fuel Quality Control
Receiving fuel safely means controlling transfer, quality and traceability: planning and supervision during delivery, identifiable samples and documents, and follow-up of the batch before use.
Operational Explanation
Bunkering brings together a controlled transfer, fuel quality for the machinery and delivery traceability. The plan identifies product type and quantity, receiving tanks, available capacity, responsible personnel, communications and conditions for slowing or stopping the transfer. Levels, connections and delivery progress need supervision throughout the operation.
Quality also requires knowing whether the new batch can be mixed with fuel already onboard and how it will be treated and used. Stability of one fuel and compatibility between fuels are different issues: two individually compliant products are not automatically compatible when mixed. The BDN, SOLAS declaration and samples document different matters; they do not replace the plan or, by themselves, establish technical suitability for every item of machinery. Completion of pumping closes the transfer, while quality checks and anomalies may still need follow-up.
Regulatory Reference
MARPOL Annex VI, regulation 18: fuel quality, Bunker Delivery Note (BDN) and representative sample where applicable. SOLAS II-2/4.2.1.6, in force from 1 January 2026: before bunkering obtain the supplier representative’s signed and certified declaration of conformity with the flashpoint requirements of paragraph 2.1 and the test method. The operational checklist comes from the SMS and applicable local/terminal and contractual requirements; regulation VI/18 does not establish a universal checklist.
The BDN states the actual flashpoint measured to acceptable standards or a statement that it has been measured at or above 70 °C. This information was introduced in MARPOL from 1 May 2024; the SOLAS declaration before bunkering is a separate 2026 requirement. The 70 °C statement is a documentary alternative, not a change to the ordinary SOLAS 60 °C oil-fuel use boundary: fuel below that boundary requires the specific permitted branch and the ship’s approved arrangement. MEPC.362(79); MSC.520(106).
Where these duties apply, retain the BDN onboard for at least three years after delivery. The representative sample required by VI/18.8.1 is sealed and signed by the supplier’s representative and the master or officer in charge at completion of bunkering; it remains under the ship’s control until the fuel is substantially consumed and for at least 12 months. Seal, label and delivery linkage must allow identification. A commercial laboratory sample does not automatically replace the retained compliance sample. MARPOL VI/18; MSC-MEPC.2/Circ.18, 2024 sampling guidelines.
For gas and low-flashpoint fuels, check the separate documentation branch of regulation 18 and the dedicated fuel provisions: do not automatically extend the conventional-fuel sample regime. MEPC.385(81). Bunkering fuel or bulk lubricating oil is also recorded in the Oil Record Book, Part I where applicable; for document fields see Bunker Delivery Note.
Scope of Application
Familiarisation with bunkering conventional liquid petroleum fuels. The ship’s plan, SMS, port/supplier conditions and product properties determine the actual actions. Gas and other low-flashpoint fuels require dedicated procedures and installations; this card does not provide their transfer sequence.
Procedure / How to Complete It
- Read the plan before starting: agreed product and quantity, receiving tanks and existing contents, available capacity and approved limits. Assess planned segregation and compatibility; identify responsibility, supervision and handover.
- Share control of the transfer: use the onboard checklist, check connections and monitoring arrangements, and agree with the supplier on communications, permitted rates/pressures for the different phases and the stop signal/arrangements. Obtain the required SOLAS declaration before bunkering.
- Supervise the operation: follow tank levels and transfer progress, communications and connection condition under the plan. A leak, unexpected level or loss of communication requires the planned response and, where called for, stopping, with the responsible person informed; do not continue relying only on the ordered quantity.
- Ensure an identifiable sample: arrange the planned safe sampling method. For the conventional representative sample, IMO guidance provides for continuous collection throughout delivery at the receiving manifold; on completion check seal, label, signatures and linkage to the BDN. Distinguish laboratory samples from the retained compliance sample.
- Close with coherent evidence: compare delivery, quantity and tanks involved against available documents; check BDN and flashpoint information, record the operation in the ORB where applicable and retain samples. Document discrepancies and initiate the SMS follow-up without making them disappear to close the file.
- Follow the fuel through to use: examine quality results under the Company programme and machinery instructions. New properties may require review of mixing and purifier treatment; changes depend on the model. Record the decision, responsible person and anomaly follow-up evidence before treating that follow-up as closed.
Practical Example
Teaching example: transfer of a new batch is complete and the BDN contains the required flashpoint information. The supplier declaration with the test method has also been obtained. The team reconciles quantities and tanks, links the seal to the delivery and makes the relevant records. Commercial analysis then identifies a property different from that expected: the responsible person compares the result with specifications, the management plan and machinery instructions, recording the decision and follow-up. Complete documents and finished pumping do not remove this check; the regulatory sample keeps its identity and custody.
What Typically Goes Wrong
Common Mistakes Mistake Library
| Mistake | Consequence | How to avoid it |
|---|---|---|
| Treating a signed BDN and checklist as sufficient control of the transfer | Levels or anomalies left unattended, with overfilling and spill risk | Connect the plan to the actual tanks, supervision and agreed communications/stopping arrangements |
| Mixing batches without the planned compatibility assessment | Possible sludge formation, clogged filters and compromised fuel supply | Check segregation, properties and mixing plan before use |
| Confusing the commercial sample with the retained representative sample | Traceability or regulatory sample cannot be demonstrated | Distinguish purposes and bottles; check seal, signatures, label and BDN linkage |
| Reading 70 °C as a new use limit or a simple ≥60 °C entry as sufficient BDN information | Wrong assessment of documentation or permitted arrangement | Distinguish BDN information, declaration before bunkering and SOLAS fuel-use requirements |
What the PSCO Checks
Operational Tips
- In the briefing, connect each phase to a responsible person, a tank and a communication: “who observes what” makes the plan verifiable.
- Keep batch, tank, BDN and sample references linked, including when bottles have different purposes.
- Distinguish statutory conformity, commercial specification and machinery suitability; a discrepancy needs a documented decision in the applicable process.
- For concrete measures use the ship’s plan and port requirements. MPA Singapore Circular 13/2025 is a local example of planning, communication and supervision, not a universal template.
Preparation checklist
- I can locate the plan, receiving tanks, available capacity, limits and responsible personnel
- I can explain how communications, transfer phases and stopping arrangements are agreed
- I distinguish BDN, SOLAS declaration before bunkering and samples with different purposes
- I can link seal, signatures, label, custody and retention periods to the applicable delivery
- I know where to record quantities/tanks, discrepancies, quality checks and the follow-up decision
- I know which checks precede mixing, treatment and use of the new batch
FAQ
Related Topics
Certified substantive revision: 12 October 2026 · page fingerprint 434feb73aee8