What are MARPOL regulations for Damage Stability ?

Location of Damage:

Tankers of  more than 225 metres in length, anywhere in the ship’s length. In tankers of more than 150 metres, but not exceeding 225 metres in length, anywhere on the ship’s length except involving either after or forward bulkhead bounding the machinery space located aft. The machinery space shall be treated as a single floodable compartment.
In tankers of less than 150 metres in length anywhere on the ship’s length between the adjacent transverse bulkheads with the exception of the  machinery space.

Meaning of Extent Of Damage
Side Damage 
  1. Longitudinal Extent 1/3(L 2/3) or 14.5 Metres
  2. Transverse Extent B/5 or 11.5 metres which ever is less
  3. Vertical extent – From the bottom to full height


Bottom Damage

0.3 L from fordOther part
Longitudinal extent or 5 m1/3(L 2/3) or 14.51/3(L 2/3)
Transverse extentB/6 or 10mB/6 or 5 M
Vertical extentB/15 or 6MB/15 or 6M
Stability Criteria  Of Vessel
  1. The final water line taking into account sinkage, heel and trim, shall be below the lower edge of any opening through which progressive may take place.
  2. The final stage of flooding, the angle of heel due to unsymmetrical flooding shall not exceed 25 degrees provided that this angle may be increased up to 30 degrees if no deck immersion occurs.
  3. The stability in the final stage of flooding shall be investigated and may be regarded as sufficient if the righting lever curve has at least a range of 20 degrees beyond the position of equilibrium in association with a maximum residual righting lever of at least  1 metre within the 20 degrees range; the area under the curve within this range shall be not less than  0.0175 metre radians.



DAMAGE CONTROL IN DRY CARGO SHIPS (Applicable for vessels constructed on or after 1 February 1992)

There shall be permanently exhibited or readily available on the navigating bridge, for the guidance  of the officer in charge of the ship, a plan showing clearly for each deck and hold the boundaries of the water tight compartment, the openings therein and the means of closure and position of any controls there of, and the arrangements for the correction of any list due to flooding. In addition, booklets containing the aforementioned information shall  be made available  to the officers of the ship.

Indicators shall be provided for all sliding doors and for hinged doors in water tight bulkheads. Indication showing whether the doors  are open  or closed shall be given on the navigating bridge. In addition shell doors and other openings which, in the opinion of the Administration, could lead to major flooding if left open or not properly secured shall be provided with indicators.

General precaution shall consist of a listing of  equipment, conditions and operational procedures, considered by  the administration to be necessary to maintain watertight  integrity under normal ship operations. Specific precautions shall consist of a listing of elements ( i.e. closures, security of  cargo, sounding of alarms,, etc) considered by  the Administration to be vital to the survival of the ship and its crew.

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