Statutory Documents - MCA Publications - PYC - A Code of Practice for Yachts Carrying 13 to 36 Passengers (The Passenger Yacht Code) - Chapter 2 - Load Lines - 2.15 Freeing Ports and Recesses:
2.15 Freeing Ports and Recesses:
Freeing Ports
(1) The standards for water freeing arrangements shall comply with Load Line Convention as far as it is reasonable and practicable to do so and in any case the intention shall be to achieve a standard of safety which is at least equivalent to the standard of the Load Line Convention.
(2) Where a well is created on each side of the vessel between a superstructure or deckhouse, and the bulwark in way of that superstructure or deck house, the following formula may be used, in accordance with Figure 2.2, to determine the required freeing port areas on each side of the vessel for the well concerned-
Figure 2.2
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Where- FPREQ = Required Minimum Freeing Port Area;
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Aw = Area of well in way of superstructure; and
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B = Maximum beam at deck in way of the well.
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(3) In individual cases, when the Administration considers that the requirements of Load Line Convention with respect to freeing port areas cannot be met, the Administration may consider and approve alternative arrangements to achieve adequate safety standards which may take account of a reduced permeability and volume of a well.
(4) For a Passenger Yacht 2 (PY2) the requirement for the minimum
freeing port area for a forward or after well as determined
in accordance with paragraph (2) may be reduced by a form
factor equal to the ratio of
where-
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- AW = Actual area of the well;
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LW = Overall length of the well;
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BW = Maximum breadth of the well; and
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Dimensions are measured at half the height of the bulwark above the deck of the well,
provided that
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(a) the maximum reduction shall not exceed 50%;
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(b) the stability requirements for the yacht are maintained with all the wells flooded to any level up to the height of the bulwark; and
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(c) the freeing port area provided is sufficient to allow the well to drain in less than three minutes.
Recesses
(5) Any recess in the weather deck shall be of weathertight construction and shall be self draining under all normal conditions of heel and trim of the vessel; a swimming pool or spa bath, open to the elements, shall be treated as a recess.
(6) The means of drainage provided shall be capable of efficient operation when the vessel is heeled to an angle of 10°.
(7) The drainage arrangements shall have the capability of draining the recess (when fully charged with water) within 3 minutes when the vessel is upright and at the load line draft and means shall be provided to prevent the backflow of sea water into the recess.
(8) Where it is not practical to provide drainage which meets the requirements of subsections (6) and (7), alternative safety measures may be proposed for approval by the Administration, provided that where the above requirements for quick drainage cannot be met, the effect on intact and damage stability shall be considered taking into account the mass of water and its free surface effect.
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