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3/22/14 Understanding Intact & Damage Stability of Ships www.marineinsight.com/misc/naval-architecture/understanding-intact-damage-stability-of-ships/ 1/12 LEAVE A COMMEN Share on Facebo Understanding Intact & Damage Stability of Ships JULY 13, 2011 BY KARANC Tweet 7 3 The only time a vessel can be assumed to be stationary and in upright position is when it is in dry dock or before it is launched to the sea. Once in the sea, the ship has to sustain different environmental conditions, along with effects of various external and internal changes. Premium eBook Store Marine Engineering Nautical Science Infographics Maritime Links Send Us News Advertise Resources Team HOME NEWS TECHNOLOGY NAVIGATION SAFETY CAREERS LIFE AT SEA PIRACY VIDEOS EBOOKS 42 Like

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Understanding Intact & Damage Stability of Ships

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  • 3/22/14 Understanding Intact & Damage Stability of Ships

    www.marineinsight.com/misc/naval-architecture/understanding-intact-damage-stability-of-ships/ 1/12

    LEAVE A COMMENT

    Share on Facebook

    Understanding Intact & Damage Stability ofShipsJULY 13, 2011 BY KARANC

    Tweet 7 3

    The only time a vessel can be assumed to be stationary and in upright position

    is when it is in dry dock or before it is launched to the sea. Once in the sea, the

    ship has to sustain different environmental conditions, along with effects of various external and

    internal changes.

    Premium eBook Store Marine Engineering Nautical Science Infographics Maritime Links

    Send Us News Advertise Resources Team

    HOME NEWS TECHNOLOGY NAVIGATION SAFETY CAREERS

    LIFE AT SEA PIRACY VIDEOS EBOOKS

    42Like

  • 3/22/14 Understanding Intact & Damage Stability of Ships

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    A ship is always acted upon by several forces from factors such as seawater, wind, internal mass

    weight, free surface effect etc. Thus, it is of utmost importance for a vessel to always remain stable

    and afloat in all conditions.

    A Stable Ship

    Ship stability can be defined in simple terms as its characteristics or tendency to return to its original

    state or upright state, when an external force is applied on or removed from the ship.

    A ship is at equilibrium when the weight of the ship acting down through centre of gravity is equal to

    the up thrust force of water acting through centre of buoyancy and when both of these forces are in

    same vertical line.

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    B is center of buoyancy and G is center of gravity

    A ship will come to its upright position or will become stable, when an external force is applied and

    removed, if the centre of gravity remains in the same position well below metacentric height of the

    ship. When ship is inclined, centre of buoyancy shifts from B to B1, which creates a movement and the

    righting lever returns the ship to its original position and makes it stable.

    M is metacenter and GZ is righting lever

    A ship is seaworthy if it fulfills two important stability criteria- Intact and Damage stability.

  • 3/22/14 Understanding Intact & Damage Stability of Ships

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    Requirements for Intact and Damage Stability of the Ship

    Intact stability

    For a cargo vessel, the intact stability requirements are follows-

    Initial GM or metacentric height should not be less then 0.15 m.

    Righting lever GZ should be at least 0.2 m and angle of heel 30.

    Maximum righting lever should occur at heel >30 preferably but not less than 25.

    The Area of the GZ curve should be at least:

    a) 0.055 m radian up to = 30

    b) 0.090 m radian up to = 40

    c) 0.03 m radian between 30 and 40 or between 30 and angle of down flooding.

    The angle of down flooding is an angle at which deck immersion takes place with subsequent water

    ingress.

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    Damage Stability

    A damage stability criterion varies from ship to ship and the requirement for the same is given in

    SOLAS chapter II-1. It may be single compartment flooding, multi compartment flooding, engine room

    flooding etc.

    Under all the criteria as applicable, vessel margin line should not be submerged after the damage.

    Margin line is an imaginary line drawn 75mm below the free board deck.

    Intact and damage stability are very important factors that govern the overall stability of the ship.

    You may also like to read-What is Anti-Heeling System on Ships?

    References:

    Book on Naval Architecture by E A Stokoe

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