Ship Characteristics

Question 1

What are the two types of bulk carriers?

Answer 1

• General bulk (dry bulk)

- Combination Carriers (ore/oil)

Question 2

What is the deck design of Bulk carriers?

Answer 2

-Single deck

Question 3

What is the structure for dry bulk carriers?

Answer 3

• Hopper tanks with self trimming designs to reduce the likelihood of cargo shifts.
• Double bottom tanks which may be used for bunkers, ballast and fresh water.

Question 4

What is the structure for oil/ore Carriers?

Answer 4

• Two longitudinal bulkheads which divide the ship into Central and wing tanks.
• When carrying ore, the central tanks are used for stowage of cargo.

Question 5

What are the several cargo containment structures used in Gas Carriers?

Answer 5

• Independent (completely self supporting)
• Membrane (supported through the hull insulation)
• Semi-Membrane (supports itself when not under load)
• Integral Tanks (form a structural part of the ship and can’t hold cargo which is below -10 degrees)
• Internal insulation (same as integral but can Cary chemicals below -10 degrees)

Question 6

What are the features of type A Gas tanks?

Answer 6

• Tanks have a vapour space pressure of 0.7bar.
• Cargo must be carried in a fully refrigerated condition at or near atmospheric pressure.
• All tanks have secondary barriers.

Question 7

What are the features of type B Gas tanks?

Answer 7

• Tanks that can be either constructed of plane surfaces or pressure valve type.
• More accurate type of stress analysis compared to A tanks.
• Fatigue life and crack propagation analyses can occur.
• has a partial barrier along side a splash barrier and drip tray.

Question 8

What are the features of type C Gas tanks?

Answer 8

• Type C are normally spherical or cylindrical pressure vessels.
• Designed for vapour space pressures greater that 2 bar.
• Type C is classed as semi refrigerated.
• They have no secondary barrier.

Question 9

What type of cargo is transported by Gas Carriers?

Answer 9

(Petroleum Gasses)

• Ammonia
• Vinyl chloride
• propylene

Question 10

What is the ambient pressure of an LNG tanker

Answer 10

-161 degress(fully refrigerated)

Question 11

What are the different types of tankers?

Answer 11

• Oil
• Chemical
• Liquefied petroleum Gasses (LPG)
• Liquefied natural Gasses (LNG)