Exam Question
Briefly explain the following ship terms used:
(a) LOA (2)
(b) LBP (2)
(c) Breadth Extreme (2)
(d) Breadth Moulded (2)
(e) Depth Extreme (2)
(f) Depth Moulded (2)
(g) Draught Extreme (2)
(h) Draught Moulded (2)
Class 4 (4th Engineer)
SC&S
📅 Sep 2025
Reference Answer
### Ship Principal Dimensions
These terms define the principal dimensions of a vessel and are fundamental for design, construction, regulation, and operation. A clear distinction is made between 'moulded' dimensions, which refer to the structural lines of the vessel (excluding plating thickness), and 'extreme' dimensions, which represent the overall measurements including all protrusions.
**(a) LOA (Length Overall)**
* **Definition:** LOA is the maximum length of the vessel's hull measured between the extreme forward and aftermost points. This includes all permanent structures such as the bulbous bow, stern extensions, and any other fixed protrusions.
These terms define the principal dimensions of a vessel and are fundamental for design, construction, regulation, and operation. A clear distinction is made between 'moulded' dimensions, which refer to the structural lines of the vessel (excluding plating thickness), and 'extreme' dimensions, which represent the overall measurements including all protrusions.
**(a) LOA (Length Overall)**
* **Definition:** LOA is the maximum length of the vessel's hull measured between the extreme forward and aftermost points. This includes all permanent structures such as the bulbous bow, stern extensions, and any other fixed protrusions.
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