Towing & Ship-Assist · Stability — Downflooding
On a towing vessel, weathertight/watertight closures on the working deck must be maintained because downflooding through them during a heeling event can:
- AImprove stability
- BLight the deck
- CIncrease bollard pull
- DRapidly reduce reserve buoyancy and stability, accelerating a capsize✓ Correct
Explanation
If a tug heels (e.g., from girting) and downflooding points are open, water enters and progressively floods the hull, destroying residual stability. Keeping doors, hatches, and vents closed at sea preserves the margin against capsize.
Authority: Stability principles; Subchapter M
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