Podcast
Questions and Answers
What will happen to a vessel that loses its reserve buoyancy?
What will happen to a vessel that loses its reserve buoyancy?
- Capsize and float on its side
- Float upright with the main deck awash
- Remain unaffected if the hull remains intact
- Most likely sink (correct)
In a vessel with no sheer, which feature will NOT provide extra buoyancy?
In a vessel with no sheer, which feature will NOT provide extra buoyancy?
- Higher bulwark
- Raised forecastle head
- Raised poop
- Lighter draft (correct)
If a vessel rolls to the starboard side with no movable weights onboard, where will the center of gravity move?
If a vessel rolls to the starboard side with no movable weights onboard, where will the center of gravity move?
- Move to starboard (correct)
- Move directly down
- Move to port
- Stay in the same position
What does displacement refer to in naval architecture?
What does displacement refer to in naval architecture?
Which motion about the longitudinal axis of a vessel is known as 'roll'?
Which motion about the longitudinal axis of a vessel is known as 'roll'?
If off-center ballast causes severe list or trim in a vessel, what will counterflooding into empty tanks do?
If off-center ballast causes severe list or trim in a vessel, what will counterflooding into empty tanks do?
What is the specific gravity of the oil that could be carried in the vessel with deep tanks?
What is the specific gravity of the oil that could be carried in the vessel with deep tanks?
When would a vessel be referred to as 'tender'?
When would a vessel be referred to as 'tender'?
What is the displacement of the semisubmersible floating in sea water?
What is the displacement of the semisubmersible floating in sea water?
If a tanker fully loaded with oil pumps out from the sternmost tank, what will be the effect on the draft?
If a tanker fully loaded with oil pumps out from the sternmost tank, what will be the effect on the draft?
What does tonnage tax level according to?
What does tonnage tax level according to?
If a vessel goes from salt water to fresh water, what will happen to its draft?
If a vessel goes from salt water to fresh water, what will happen to its draft?
Flashcards
Loss of Reserve Buoyancy
Loss of Reserve Buoyancy
A vessel that loses its reserve buoyancy will most likely sink.
Displacement (Naval Architecture)
Displacement (Naval Architecture)
Displacement refers to the number of long tons of water displaced by a vessel afloat.
Roll (Vessel Motion)
Roll (Vessel Motion)
Roll is the motion about the longitudinal axis of a vessel.
Counterflooding Effect
Counterflooding Effect
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Tender Vessel
Tender Vessel
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Tonnage Tax
Tonnage Tax
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Study Notes
Vessel Buoyancy and Stability
- Loss of reserve buoyancy leads to increased risk of capsizing and reduced stability.
- In vessels without sheer, the absence of superstructures like raised decks will NOT enhance buoyancy.
Center of Gravity and Vessel Motion
- If a vessel rolls to the starboard side with no movable weights, the center of gravity moves to starboard, affecting balance.
- 'Roll' refers to the motion where the vessel tilts side to side about its longitudinal axis.
Ballast Management
- Severe list or trim due to off-center ballast can be remedied by counterflooding into empty tanks, which redistributes weight and stabilizes the vessel.
Tonnage and Displacement
- Specific gravity of oil carried in deep tanks typically varies around 0.85 to 0.95, impacting the vessel's buoyancy and loading capacity.
- A vessel is referred to as 'tender' when it exhibits excessive rolling motions due to a high center of gravity or narrow beam.
Displacement and Draft
- Displacement in naval architecture refers to the weight of water displaced by the vessel, directly correlating with its weight when floating.
- The displacement of a semisubmersible vessel in sea water is determined by its unique design, allowing it to remain stable and afloat while supporting structures.
Effects of Ballast and Water Density
- If a fully loaded tanker pumps out from the sternmost tank, the draft will decrease, potentially causing the vessel to trim nose-up.
- Tonnage tax levels depend on the vessel's dimensions, type, and specific use, impacting tax liabilities.
- Transitioning from salt water to fresh water results in an increase in draft due to the lower density of fresh water compared to salt water.
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