Question

(a) Describe measures which may be taken to improve the stability or trim of a damaged ships (6)

(b) A watertight bulkhead is 8 m high and is supported by vertical stiffeners 700 mm apart, connected at the tank top by brackets having 10 rivets 20 mm diameter. The bulkhead is flooded to its top edge with sea water. Determine:

(a) Shearing force at top of stiffeners,

(b) Shear stress in the rivets,

(c) Position of zero shear.

Answer 1

Part (a)

Measures to improve the Stability or Trim of a damaged ship:

Close all watertight doors, hatches, and openings to maintain the ship's watertight integrity.
Shut valves leading to the damaged compartment to isolate it.
Conduct a visual inspection to determine the extent of the damage.
Sound the flooded compartment to measure the water level and assess the severity of flooding.
Use bilge and ballast pumps to pump out water from the damaged compartment.
Transfer liquids in tanks to achieve a balanced condition and counteract the list caused by flooding.
Fill tanks on the opposite side of the damaged area to create a counteracting moment.
Fill slack tanks to reduce the free surface effect and improve stability.
Continuously monitor the ship's stability using the loadicator or other stability monitoring systems.
Inform the relevant authorities, including the shipowner and port officials, about the damage.
Request external help if necessary for towing, salvage, or additional pumping capacity.

✓ Verified Model Answer (Text Solution)

Measures to improve the Stability or Trim of a damaged ship: