Exam Question
Briefly explain the following ship terms commonly used:
(a) Gross Tonnage (2)
(b) Deadweight (2)
(c) Displacement (3)
(d) Strakes (3)
(e) Deck Beams (3)
(f) Girders (3)
Class 4 (4th Engineer)
SC&S
📅 Dec 2023
Reference Answer
### (a) Gross Tonnage (GT)
Gross Tonnage is a unitless index representing the total internal volume of a vessel's enclosed spaces, calculated in accordance with the rules of the 'International Convention on Tonnage Measurement of Ships, 1969'. It is not a measure of weight or displacement.
* **Concept**: As stated in the reference, it is a measure of a ship’s overall internal enclosed volume from keel to funnel. It encompasses all spaces, which can be broadly categorised into 'Earning space' (e.g., cargo holds) and 'Non-earning space' (e.g., engine room, accommodation, ballast tanks).
* **Calculation**: The GT is derived from the total moulded volume (V) of all enclosed spaces in cubic metres using a formula:
Gross Tonnage is a unitless index representing the total internal volume of a vessel's enclosed spaces, calculated in accordance with the rules of the 'International Convention on Tonnage Measurement of Ships, 1969'. It is not a measure of weight or displacement.
* **Concept**: As stated in the reference, it is a measure of a ship’s overall internal enclosed volume from keel to funnel. It encompasses all spaces, which can be broadly categorised into 'Earning space' (e.g., cargo holds) and 'Non-earning space' (e.g., engine room, accommodation, ballast tanks).
* **Calculation**: The GT is derived from the total moulded volume (V) of all enclosed spaces in cubic metres using a formula:
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