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Bunker Quantity Survey Guide

A bunker quantity survey aims to establish a reliable quantity record around a fuel delivery. The method may use tank gauging, approved mass-flow metering or another accepted measurement system depending on the port and delivery arrangement.

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IMT PRACTICAL GUIDEUPDATED SEPTEMBER 2026PRIMARY KEYWORD: BUNKER QUANTITY SURVEY
IMT
International Maritime Training Research Team

Maritime knowledge article · Reviewed against official and primary industry sources where applicable

Last updated September 2026

Overview

A bunker quantity survey aims to establish a reliable quantity record around a fuel delivery. The method may use tank gauging, approved mass-flow metering or another accepted measurement system depending on the port and delivery arrangement.

For maritime professionals, the useful question is not only “what does the term mean?” but “what evidence would show that the work was performed properly?” This guide therefore focuses on the practical link between the governing framework, onboard or cargo-side activity, and the records a competent professional would expect to see.

Key Points to Understand

01Quantity evidence should be collected before and after transfer using the applicable method.
02Tank-based work requires careful attention to measurements, tank tables, temperature and correction methods where relevant.
03Mass-flow-meter deliveries rely on the approved metering system and its prescribed operational controls.
04Any unexplained interruption, line change, document correction or measurement inconsistency should be logged at the time.

Practical Process

The exact method must always be adapted to the vessel, cargo, company procedures, local rules and the scope of the assignment. A disciplined sequence helps keep evidence complete and prevents the work from drifting away from its objective.

  1. Review delivery details and expected quantity.
  2. Confirm the measurement method and relevant equipment status.
  3. Record initial measurements or meter conditions.
  4. Witness transfer events and significant interruptions.
  5. Record final measurements or meter totals.
  6. Reconcile delivered figures with documents and issue a report.
Evidence principle: write down what was actually checked, how it was checked, and any limitation that could affect the conclusion. A clear limitation is stronger than an unsupported assumption.

Common Mistakes

Most weak inspections, surveys and audits do not fail because the professional forgot a complicated formula. They fail because scope, evidence or follow-up became unclear. Watch especially for:

  • Mixing methods without explaining how the final quantity was derived.
  • Rounding figures too early in the calculation.
  • Failing to preserve original measurement sheets.

Practical Checklist

This is an IMT working checklist, not a substitute for the applicable convention, code, flag requirement, port rule, company procedure or contractual instruction.

  • Method defined
  • Initial evidence retained
  • Transfer log kept
  • Final evidence retained
  • Corrections documented
  • Arithmetic independently checked

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Frequently Asked Questions

What is the purpose of a bunker quantity survey?

To create an independent, traceable quantity record around a bunker delivery.

Is tank gauging still used where mass-flow metering exists?

It depends on local rules. Singapore, for example, publishes specific requirements governing MFM and circumstances in which tank-gauging procedures apply.

Does the survey prove fuel quality?

No. Quantity and quality are different questions and require different evidence.

Authoritative Sources

Regulatory statements in this guide are grounded in the following primary or official sources. Operational recommendations are presented as IMT practical guidance.

International Maritime Training (IMT) is an independent training provider. This educational guide is not issued by, affiliated with, or endorsed by IMO, ILO, MPA Singapore, or any other authority referenced above.