Bunker Verification: Target, Flowmeter and Tank Sounding

MANTRAZ bunker verification checks every bunkering against three numbers: the target quantity, the MANTRAZ flowmeter total and the tank sounding before and after. It is for vessel owners and operators who want to pay for the fuel that actually reached their tanks, and to settle questions with a supplier from data rather than from memory.

Three numbers that should agree

Every bunkering has a quantity that was ordered, a quantity that flowed into the tanks and a quantity the tanks show when they are sounded. In theory they match. In practice they often do not, and the gap can come from very different places: a leak, a spill, a meter that needs calibration, or a delivery that came up short. Without a record that ties the discrepancy to a cause, it turns into an argument nobody can close.

How bunker verification works in MANTRAZ

After every bunkering, the bunkering log sets the three numbers next to each other:

• the target quantity
• the MANTRAZ flowmeter total for the delivery
• the tank sounding before and after

The discrepancy is shown both in KL and as a percentage, so a gap is visible straight away and its size is clear, rather than being worked out by hand from separate documents.

Bunker sounding next to the flowmeter

Sounding and flowmeter readings look at the same delivery from two sides. The flowmeter measures what passed through during the bunker. The sounding before and after shows what the tanks gained. Keeping them in one log means that when they disagree, you see it on the same page, for the same bunker, while the details are still fresh.

Adjustments with a reason and a name

A number on its own does not explain what happened. In MANTRAZ, corrections are recorded as adjustments with a reason, such as:

• a pipe leak
• spillage
• meter calibration
• a supplier dispute

Each adjustment also records who made it and when. A bunker record then reads less like "we got less than we ordered" and more like a traceable account of what was found, why and by whom.

When there is a dispute

If a discrepancy points to the supplier, the conversation starts from the bunkering log: the target, the measured total, the soundings, the gap in KL and percent, and any adjustments already recorded. That is a much stronger place to begin than a delivery note and a recollection.

Every bunker also feeds the vessel's running Remain On Board balance, which uses adjustments to keep the balance in line with the tanks.

Who uses it

Fleet managers and office teams use bunker verification to review every delivery across the fleet. Because every adjustment carries a name and a time, it is always clear who recorded what. Whoever handles supplier questions gets a complete record for each bunker.

See it on the map

The bunker verification chapter on the MANTRAZ homepage shows a demo bunkering log with target, flowmeter and sounding side by side. To see it on your own bunkers, contact the team for a demo.