Bunker surveyor performs quantity verification through the use of calibrated measuring instruments.
Bunker Quantity Survey (BQS)
BQS is an independent, professional measurement of marine fuel (bunkers) transferred from one party to another to verify accurate quantity and quality.
On / Off Hire Bunker ROB (Remaining On Board) Survey
ROB Survey determines the exact quantity of fuel (bunkers) on a vessel at key moments in a charter:
ON Hire Survey → conducted at the start of the charter
OFF Hire Survey → conducted at the end of the charter
An independent surveyor ensures accuracy by:
- Physically gauging all fuel tanks
- Verifying tank reference heights
- Comparing measurements with calibration tables
- Measuring temperature of fuel
- Applying correct volume correction factors
The On/Off Hire ROB Survey is essential for:
- Fair financial settlement
- Transparency between Owner and Charterer
- Avoiding disputes over fuel quantities
