MARPOL Annex II - NLS Discharge Compliance
Noxious Liquid Substance discharge compliance check per MARPOL Annex II - distance from land, depth, en-route speed, and residue concentration.
Compliance
Allowed (prewash for Y required before)
Formula, assumptions, and limits
Residue concentration max 1 ppm (Y) to 10 ppm (Z). Prewash required for Category X & Y tanks before normal washing. Special area stricter.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| NLS X/Y/Z/OS | - | IBC Code Ch.17 | |
| Distance from land | nm | GPS |