Exam Question
(a) Draw a labeled sketch of midship section of a double hull oil tanker. (10)
(b) What are Aframax, Suezmax, ULCC and VLCC tankers? (6)
Class 4 (4th Engineer)
SC&S
📅 Jun 2023
Reference Answer
### (a) Labeled Sketch of Midship Section of a Double Hull Oil Tanker
#### Concept and Regulatory Framework
The double hull construction is a mandatory design feature for oil tankers as stipulated by the International Convention for the Prevention of Pollution from Ships (MARPOL 73/78), Annex I, Regulation 19. The primary purpose is to mitigate the risk of oil outflow in the event of low-energy collisions or groundings. It consists of an outer hull and an inner hull, creating a protective void or ballast space between the cargo tanks and the sea.
This design effectively creates a safety barrier. The spaces between the two hulls, known as wing tanks (at the sides) and double bottom tanks, are typically used for segregated ballast water, ensuring that ballast operations do not introduce hydrocarbons into the marine environment.
#### Concept and Regulatory Framework
The double hull construction is a mandatory design feature for oil tankers as stipulated by the International Convention for the Prevention of Pollution from Ships (MARPOL 73/78), Annex I, Regulation 19. The primary purpose is to mitigate the risk of oil outflow in the event of low-energy collisions or groundings. It consists of an outer hull and an inner hull, creating a protective void or ballast space between the cargo tanks and the sea.
This design effectively creates a safety barrier. The spaces between the two hulls, known as wing tanks (at the sides) and double bottom tanks, are typically used for segregated ballast water, ensuring that ballast operations do not introduce hydrocarbons into the marine environment.
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