Statutory Documents - MCA Publications - PYC - A Code of Practice for Yachts Carrying 13 to 36 Passengers (The Passenger Yacht Code) - Chapter 4 - Construction, Subdivision and Stability - Part II - Stability - 4.10 Requirements Concerning Passenger Ship Stability:
4.10 Requirements Concerning Passenger Ship Stability:
(1) A passenger ship intended to carry 36 or more persons is to be capable of withstanding damage along the side shell to an extent specified in subsection (2) and compliance with this section is to be achieved by demonstrating that si, as defined in section 4.8(2), is not less than 0.9 for the three loading conditions on which is based the calculation of the subdivision index.
(2) The damage extent to be assumed when demonstrating compliance with section 4.10(1), is to be dependent on both N and Ls, as defined in section 1.3 and subsection 4.5(2) respectively, such that-
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(a) the vertical extent of damage is to extend from the ship’s moulded baseline to a position up to 12.5 metres above the position of the deepest subdivision draft as defined in section 1.3 unless a lesser vertical extent of damage were to give a lower value of si, in which case this reduced extent is to be used;
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(b) where 400 or more persons are to be carried, a damage length of 0.03Ls but not less than 3 m is to be assumed at any position along the side shell, in conjunction with a penetration inboard of 0.1B but not less than 0.75 m measured inboard from the ship side, at right angles to the centreline at the level of the deepest subdivision draught;
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(c) where less than 400 persons are carried, damage length is to be assumed at any position along the shell side between transverse watertight bulkheads provided that the distance between two adjacent transverse watertight bulkheads is not less than the assumed damage length; if the distance between adjacent transverse watertight bulkheads is less than the assumed damage length, only one of these bulkheads shall be considered effective for the purpose of demonstrating compliance with section 4.10(1);
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(d) where 36 persons are carried, a damage length of 0.015Ls but not less than 3 metres is to be assumed, in conjunction with a penetration inboard of 0.05B but not less than 0.75 metres; and
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(e) where more than 36, but fewer than 400 persons are carried the values of damage length and penetration inboard, used in the determination of the assumed extent of damage, are to be obtained by linear interpolation between the values of damage length and penetration which apply for ships carrying 36 persons and 400 persons as specified in sections 4.10(2)(d) and 4.10(2)(b).
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