Cargo Operations & Stability Flashcards

What is the significance of the vessel's stability booklet?

Answer: It contains approved loading conditions and stability criteria that the DWO must consult during cargo operations

The stability booklet provides approved loading conditions, stability criteria, and calculation guidance that officers must reference during cargo operations to ensure the vessel maintains adequate stability.

What is free surface effect and why is it dangerous?

Answer: The reduction of stability caused by liquid moving freely in partially filled tanks

Free surface effect occurs when liquid in a partially filled tank shifts with the vessel's motion, effectively raising the center of gravity and reducing stability, potentially leading to capsizing.

What is the purpose of a cargo securing manual?

Answer: To provide detailed instructions for securing different types of cargo to prevent shifting at sea

The cargo securing manual provides ship-specific guidance on securing arrangements, including lashing patterns, equipment specifications, and securing methods for various cargo types.

What does GM (metacentric height) indicate about a vessel?

Answer: The vessel's initial stability — a measure of its resistance to heeling

GM measures the distance between the center of gravity (G) and the metacenter (M). A positive GM indicates the vessel will return to upright after being heeled; larger GM means stiffer stability.

What is the load line (Plimsoll line) on a vessel?

Answer: Markings on the hull indicating the maximum draft permitted for different water conditions and seasons

The load line (Plimsoll mark) indicates maximum permissible drafts for different water densities and seasonal conditions, preventing overloading that could compromise the vessel's seaworthiness.

What is the Dangerous Goods (IMDG) Code?

Answer: The International Maritime Dangerous Goods Code classifying and regulating the transport of hazardous cargo by sea

The IMDG Code provides a uniform international system for classifying, packaging, labeling, stowing, and handling dangerous goods transported by sea, ensuring safety.