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Deterministic Damage Stability This is a traditional method of assessment of the stability of a ship when it is flooded. In this process, the ship is divided into several subdivisions along its length with the help of transverse watertight bulkheads. Now the stability of the ship is calculated when one or more compartments get flooded…
Parametric rolling occurs when the pitching period is either equal to or half of that of the rolling period. Large roll angles may occur quickly in head or stern seas or nearly head or stern seas. The roll angle may increase from a few degrees to over 30 degrees in only a few cycles. It…
Stability is the science of calculating the ability of ship to remain upright in all Conditions of weather and seas. One of the important aspects of determining such stability is the knowledge of areas and the volumes of the ship. Even though practical stability calculations do not require us to calculate these parameters at sea,…
Why the vessel has to be inclined ??? To obtain the metacentric height it is necessary to determine the position of the centre of gravity `G’. This calculation consists of two parts. a) The first is the finding of the height of the metacentre ‘M’ above the keel ‘K’. This is purely geometrical depending only…
Basic Understanding In very broad terms, the ability of a vessel to maintain the true vertical can be termed as the measure of her Transverse Stability. Transverse Stability is the ability of the vessel to return to vertical when she has been heeled. The heeling could be because of an external force including the action…
Theory 1. Grounding is similar to dry-docking, but with certain modifications as follows : a. Ship may have any displacement. b. Trim may be by the stern or by the head or the ship may be on even keel. c. The point of contact on grounding may be anywhere from forward to aft. d. Ship…
Theory 1. During dry docking the ship shall be in as light a condition as possible. 2. It shall be trimmed by the stern. 3. Minimum trim required for safe and convenient docking is prescribed by the dock authorities. 4. Chief Officer shall ensure that during the docking process the ship continues to have sufficient…
What is Bilging Bilging is said to occur when ingress of water takes place into the vessel from a point below the waterline, such that the water is free to flow in and out of the vessel. If the water enters the vessel from above the waterline then it will not be able to flow…
Reg. 25 Ch II – 1 of SOLAS deals with subdivision & damage stability of Cargo Ships. Reg.25-8: Master shall be supplied with such reliable information so as to have raid & simple means to obtain accurate guidance as to stability under varying conditions of service. Information to include 1. Minimum operational GM Vs Draft…
When a ship with negative initial metacentric height is inclined to a small angle, the righting lever is negative, resulting in a capsizing moment. This effect is shown in Figure and it can be seen that the ship will tend to heel still further. At a large angle of heel the centre of buoyancy will…