Question

The margin line used for the floodable length calculation of a ship is:

• A. 76 mm above the ship’s baseline
• B. 76 mm inside the zero-buttock line in the profile view of the ship’s lines plan
• C. a line drawn 76 mm parallel to and below the watertight main deck at side
• D. a line drawn 76 mm parallel to and below the watertight main deck along the ship’s centerline if the ship has camber

Hint:

In ship design, the margin line is critical for floodable length calculations and is drawn parallel to the main deck below the watertight boundary.

Answer 1

The Correct Option is C

Step 1: Understand the purpose of the margin line.
The margin line is a key concept in determining the floodable length of a ship in the event of a breach. It helps in calculating the stability and safety of the vessel.
Step 2: Evaluate the options.
- Option (A): This option is incorrect, as the margin line is not defined above the ship's baseline.
- Option (B): The zero-buttock line is not the correct reference for determining the margin line.
- Option (C): This option is correct. The margin line is typically drawn 76 mm parallel to and below the watertight main deck, helping calculate the floodable length.
- Option (D): The margin line does not rely on the ship’s centerline, but rather the watertight deck. Thus, the correct answer is (C).