Use the floodable length curve in Section 1, the blue pages, of the Stability Data Reference Book. If the curve represents 45 percent permeability and holds 4 and 5 flood, the vessel will sink if the permeability exceeds what percent?
• Floodable length curve at 45% permeability in the Stability Data Reference Book • Relationship between permeability and how much of the ship’s length can be flooded without sinking • How to read off the maximum allowable permeability for a given compartment (here, holds 4 and 5) from the curve
• On the floodable length curve for 45% permeability, locate the position that corresponds to holds 4 and 5. How is that location used to determine the limiting permeability? • Think about what happens to the vessel’s safety margin if permeability increases: does the ship tolerate more or less flooded length? • Is the critical permeability for sinking higher or lower than 45%, and what does that tell you about which answer choices could make sense?
• Confirm you are using the correct curve (45% permeability) and the correct longitudinal position for holds 4 and 5 • Verify how the Stability Data Book tells you to convert floodable length at 45% permeability into a limiting permeability value • Check which of the answer choices is consistent with the trend: as permeability goes up, the allowable floodable length changes in a predictable direction
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