In the reporting system WETREP, every kind of oil tanker
of more than 600 tonnes deadweight, carrying a cargo of:
- heavy crude oil, meaning crude oils with a density at 15°C
of higher than 900 kg/m3;
- heavy fuel oils, meaning fuel oils with a density at 15°C
of higher than 900 kg/m3, or a kinematic viscosity at 50°C
of higher than 180 mm2/s;
- bitumen and tar and their emulsions.