What are the conditions of assignment, how do they keep a ship watertight, and why must they be inspected periodically?
Short answer
| Fitting (ICLL Annex I) | How it fails in service |
|---|---|
| Hatch covers (regulations 14 to 16) | perished gasket, corroded cleat, distorted cover or coaming |
| Air pipes (20) | seized or corroded automatic closing head |
| Ventilators (19) | missing closing appliance, coaming wasted below height |
| Weathertight doors (12) | perished gasket, seized or missing clamping devices, corroded hinges |
| Scuppers and discharges (22) | stuck non-return valve letting the sea back in |
| Freeing ports (24) | seized or jammed shutters, blocked by rust, paint or lashings |
| Side scuttles (23) | cracked glass, missing deadlights |
- Meaning: the structural and equipment conditions a ship must satisfy for its freeboard to be assigned (ICLL Annex I chapter II, regulations 12 to 26): strength, doors, hatchways, machinery-space openings, ventilators, air pipes, scuppers and discharges, side scuttles, freeing ports, crew protection.
- Watertight integrity: they keep water out (doors, hatch covers, ventilator closures, air-pipe heads, deadlights, non-return valves), get water off (freeing ports) and preserve strength, so the reserve buoyancy behind the freeboard is real.
- Why periodic inspection: Article 15 forbids changes after survey; fittings deteriorate by corrosion, wear, distortion, perished gaskets and seized mechanisms, so the annual and renewal load-line surveys confirm they still work.
- Instances: a perished hatch gasket leaking under hose test; a seized air-pipe head; a missing ventilator closure; seized door clamps; a stuck scupper non-return valve; jammed freeing ports; wasted casing plating.
- As Chief Engineer: air pipes, machinery-space openings, ventilators, scuppers and their valves are maintained and tested.
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.