What are the discharge criteria for concentration in ppm?
Short answer
| Aspect | Requirement |
|---|---|
| ppm definition | parts of oil per million parts of water by volume (ml/m³) |
| Machinery-space limit | 15 ppm |
| Discharge conditions | en route, through 15 ppm separator, monitor + stop device |
| Special areas | prohibited |
| Record | Oil Record Book Part I |
- ppm definition: parts of oil per million parts of water by volume, or ml/m³
- Concentration limit: 15 ppm for machinery-space oily water
- Discharge conditions: en route, through 15 ppm separator, oil-content monitor and automatic stop device in operation
- Special areas: discharge of oily mixtures from machinery spaces prohibited
- Record: Oil Record Book Part I
- Governing instrument: MARPOL Annex I, regulations 14, 15, 17
- India: Merchant Shipping Act 2025, section 147; DGMA enforces
- CE action: retain bilge and land ashore if equipment fails; record every operation truthfully
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class I section of the Marine One forum, open to members enrolled for the MEO Class I exam.