Class 1 (Chief Engineer) Engineering Management 📅 Apr 2023

Exam Question

The HNS Convention is expected shortly to come into force. Explain the following in respect of this convention. (16)

(a) List and give examples of substances covered under this convention

(b) Types of pollution and subsequent losses or damages which can come under this convention

(c) Why would an oil products tanker probably require to have certificates under all 3 conventions i.e., CLC, Bunker and HNS.

Reference Answer

### (a) Substances Covered Under the HNS Convention
The HNS Convention provides a comprehensive framework covering a wide array of substances deemed hazardous and noxious. The definition is linked to substances already classified under other IMO instruments. The categories and examples are as follows:
* **Oils (as defined in MARPOL Annex I)**: This category includes crude oil, fuel oil, sludge, oil refuse, and refined products which are persistent in nature. However, pollution damage from persistent oils carried as cargo on tankers is covered by the Civil Liability Convention (CLC).
* **Noxious Liquid Substances (NLS) (as defined in MARPOL Annex II)**: These are primarily chemicals carried in bulk.

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