Cd.61 STABILITY II

BASIC OF DAMAGE STABILITY THEORY

1. What is usually the effect on G when the ship is damaged?

• It is unchanged.

2. Which of the following statements are true, with respect to change of stability parameters for a damaged ship?

• M moves, B moves and GM increases or decreases.

3. What statement is true about volume permeability?

• A- If the volume permeability is 0%, no water will enter the compartment in case of damage

• C- If the volume permeability is 100%, the damage compartment below the waterline will be completely filled with water in case of damage.

4. What statement is true about the metacentric radius?

• B - The distance between B and metacentre, depending on the displacement and the moment of inertia of the waterplane area.

DAMAGE STABILITY CALCULATIONS

1. Click and drag the different terms to their corresponding boxes.

2. Which statements are true concerning the added weight method:

• A - since the method is similar to an ordinary load calculation

• D - Since the free surface has effect on the stability both at unsymmetrical and symmetrical damage. The methods regards the seawater as a liquid load in a “large tank”, nut the effect is greater in unsymmetrical damage.

3. In the added weight method, the free communication effect in damaged condition:

• C - Reduces the GM and decreases the dynamic stability by sinus correction of the GZ curve.

4. Which statements are true concerning the Loss of Buoyancy method:

• B - The damaged compartment is considered non-existing.

DAMAGE STABILITY REGULATIONS

1. What is the minimum required righting lever for a damaged passenger ship at intermediate state of flooding?

• B - 0.05 meters

2. What is the minimum required residuary dynamic stability for a damaged passenger ship at equilibrium?

• C - 0.015 meter-radius

3. What is the minimum required righting lever for a damaged passenger ship at final state of flooding?

• B - 0,10 meters

4. On the right you see the correct combinations.

STABILITY ASSESSMENT TABLE

1. How many damaged compartments does the following ship survive? Click on the different watertight compartments and analyze the triangles.

• B - 2 compartments

2. Which the following statement(s) are true?

• B - Cross flooding arrangements helps the water to reach the opposite side of the damaged compartment so that the heeling angle is reduced.

• C - A damage control plan shows the boundaries of watertight compartments and openings therein.

3. A ship has VCG=9,80m above keel. The metacentre position above keel varies according the hydrostatic table:

What is the maximal permissible draught for the ship to full fill the stability requirements?

• D - 7,0m since

4. What is the minimum required GM for a ship with following GMmin curve abd draught 6.3meter.

- A - 1.7m

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