American Bureau of Shipping environmental class notation.
ENVIRO baseline (all four required)
- Engine NOx ≥ Tier II equivalent + SCR or EGR.
- Fuel sulphur ≤ 0.10 % in ECA, ≤ 0.50 % globally.
- Garbage management plan + ship-to-shore receipt record.
- Sewage Type-II system per MEPC.227(64).
ENVIRO+ additions
- Black + grey water treatment with membrane bioreactor.
- Bio-degradable oils at all sea-water interfaces.
- Continuous emissions monitoring on main stack.
- Underwater radiated noise below ABS UWN criteria.
Sources
- ABS - Rules for Environmental Protection Notations.
- ABS - ENVIRO+ guidance.