Temperature Correction Error: 12 MT of Fuel Lost in Calculation

The BDN showed 500 MT delivered at 35°C.

The vessel's tank soundings calculated 488 MT.

The chief engineer noted the discrepancy and signed the BDN.

But nobody had accounted for temperature correction.

The actual delivered quantity: 488 MT. The dispute: 12 MT ($7,200).

The Incident

Vessel: MV Sea Trader

Location: Singapore

Fuel: VLSFO delivery

Temperature: 35°C

Quantity Discrepancy: 12 MT

The Mathematical Reality

What the Supplier Claimed

BDN Quantity: 500 MT

Temperature: 35°C

Density at 35°C: 985 kg/m³

The supplier billed for 500 MT.

What the Vessel Measured

Tank soundings: Calculated 488 MT

Method: Volume at 35°C × density at 35°C

The vessel received 488 MT by tank measurement.

The Missing Piece: Temperature Correction

Fuel expands when hot. Contracts when cold.

To compare quantities, both must be corrected to the standard reference temperature: 15°C.

At 35°C, fuel is about 2.5% larger by volume than at 15°C.

500 MT at 35°C = approximately 488 MT at 15°C.

The vessel was correct. They received 488 MT, not 500 MT.

Why They Lost the Initial Dispute

The Chief Engineer's Mistake

He noted the discrepancy on the BDN:

> "Received quantity per tank soundings: 488 MT. BDN shows 500 MT."

But he didn't include:

The supplier argued: "You signed for 500 MT. 500 MT was delivered."

Without documented calculations showing the temperature correction, the vessel had no case.

The Resolution

Three months later, after hiring an independent surveyor:

Recovery: $7,200

The Prevention Protocol

Before Bunkering

During Bunkering

Before Signing BDN

The Temperature Correction Calculator

Get the Quantity Dispute Prevention Kit:

[Download the Free Quantity Dispute Prevention Kit]

Key Lessons

12 MT at $600/MT = $7,200.

A simple temperature correction calculation could have prevented this dispute entirely.

Calculate correctly. Document everything. Protect your interests.