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02/04/1977 Verdrag van Torremolinos
Internationaal Verdrag van 2 april 1977 voor de beveiliging van vissersvaartuigen

Chapter III Stability and associated seaworthiness

Regulation 1 General

Vessels shall be so designed and constructed that the requirements of this chapter will be satisfied in the operating conditions referred to in regulation 7. Calculations of the righting lever curves shall be to the satisfaction of the Administration. (4)
(4)
See appendix I of the Recommendation on Intact Stability of Fishing Vessels adopted by the Organization by resolution A.168(ES.IV) and the Code of Practice concerning the Accuracy of Stability Information for Fishing Vessels adopted by the Organization by resolution A.267(VIII).

Regulation 2 Stability criteria

(1)

The following minimum stability criteria shall be met unless the Administration is satisfied that operating experience justifies departures therefrom:
(a)
the area under the righting lever curve (GZ curve) shall not be less than 0055 m-rad up to 30 degrees angle of heel and not less than 0090 m-rad up to 40 degrees or the angle of flooding hf if this angle is less than 40 degrees. Additionally, the area under the righting lever curve (GZ curve) between the angles of heel of 30 degrees and 40 degrees or between 30 degrees and (theta)f, if this angle is less than 40 degrees shall not be less than 0030 m-rad. (Theta)f is the angle of heel at which openings in the hull, superstructure or deckhouses which cannot rapidly be closed weathertight commence to immerse. In applying this criterion, small openings through which progressive flooding cannot take place need not be considered as open;
(b)
the righting level GZ shall be at least 200 mm at an angle of heel equal to or greater than 30 degrees;
(c)
the maximum righting lever GZmax shall occur at an angle of heel preferably exceeding 30 degrees but not less than 25 degrees;
(d)
the initial metacentric height GM shall not be less than 350 mm for single deck vessels. In vessels with complete superstructure or vessels of 70 m in length and over the metacentric height may be reduced to the satisfaction of the Administration but in no case shall be less than 150 mm.

(2)

Where arrangements other than bilge keels are provided to limit the angles of roll, the Administration shall be satisfied that the stability criteria given in paragraph (1) are maintained in all operating conditions.

(3)

Where ballast is provided to ensure compliance with paragraph (1), its nature and arrangement shall be to the satisfaction of the Administration.

Regulation 3 Flooding of fish-holds

The angle of heel at which progressive flooding of fish-holds could occur through hatches which remain open during fishing operations and which cannot rapidly be closed shall be at least 20 degrees unless the stability criteria of regulation 2(1) can be satisfied with the respective fish-holds partially or completely flooded.

Regulation 4 Particular fishing methods

Vessels engaged in particular fishing methods where additional external forces are imposed on the vessel during fishing operations, shall meet the stability criteria of regulation 2(1) increased, if necessary, to the satisfaction of the Administration.

Regulation 5 Severe wind and rolling

Vessels shall be able to withstand, to the satisfaction of the Administration, the effect of severe wind and rolling in associated sea conditions taking account of the seasonal weather conditions, the sea states in which the vessel will operate, the type of vessel and its mode of operation. (7)
(7)
See the Recommendation on Weather Criterion for Fishing Vessels of 24 Metres in Length and Over adopted by the Organization by resolution A.685(17).

Regulation 6 Water on deck

Vessels shall be able to withstand, to the satisfaction of the Administration, the effect of water on deck, taking account of the seasonal weather conditions, the sea states in which the vessel will operate, the type of vessel and its mode of operation. (10)
(10)
See the Guidance on a Method of Calculation of the Effect of Water on Deck contained in recommendation 1 of attachment 3 to the Final Act of the Conference.

Regulation 7 Operating conditions

(1)

The number and type of operating conditions to be considered shall be to the satisfaction of the Administration and shall include the following, as appropriate:
(a)
departure for the fishing grounds with full fuel, stores, ice, fishing gear, etc.;
(b)
departure from the fishing grounds with full catch;
(c)
arrival at home port with full catch and 10 % stores, fuel, etc.; and
(d)
arrival at home port with 10 % stores, fuel, etc. and a minimum catch, which shall normally be 20 % of full catch but may be up to 40 % provided the Administration is satisfied that operating patterns justify such a value.

(2)

In addition to the specific operating conditions given in paragraph (1) the Administration shall also be satisfied that the minimum stability criteria given in regulation 2 are met under all other actual operating conditions including those which produce the lowest values of the stability parameters contained in these criteria. The Administration shall also be satisfied that those special conditions associated with a change in the vessel's mode or areas of operation which affect the stability considerations of this chapter are taken into account.

(3)

Concerning the conditions referred to in paragraph (1), the calculations shall include the following:
(a)
allowance for the weight of the wet fishing nets and tackle, etc. on the deck;
(b)
allowance for ice accretion, if anticipated, in accordance with the provisions of regulation 8;
(c)
homogeneous distribution of the catch, unless this is inconsistent with practice;
(d)
catch on deck, if anticipated, in operating conditions referred to in paragraph (1)(b) and (c) and paragraph (2);
(e)
water ballast if carried either in tanks which are especially provided for this purpose or in other tanks also equipped for carrying water ballast; and
(f)
allowance for the free surface effect of liquids and, if applicable, catch carried.

Regulation 8 Ice accretion

(1)

For vessels operating in areas where ice accretion is likely to occur the following icing allowance shall be made in the stability calculations: (13)
(a)
30 kg/m² on exposed weather decks and gangways;
(b)
7.5 kg/m² for projected lateral area of each side of the vessel above the water plane;
(c)
the projected lateral area of discontinuous surfaces of rail, spars (except masts) and rigging of vessels having no sails and the projected lateral area of other small objects shall be computed by increasing the total projected area of continuous surfaces by 5 % and the static moments of this area by 10 %.

(2)

Vessels intended for operation in areas where ice accretion is known to occur shall be:
(a)
designed to minimize the accretion of ice; and
(b)
equipped with such means for removing ice as the Administration may require.
(13)
For sea areas where ice accretion may occur and modifications of the icing allowance are suggested, see the Guidance Relating to Ice Accretion contained in recommendation 2 of attachment 3 to the Final Act of the Conference.

Regulation 9 Inclining test

(1)

Every vessel shall undergo an inclining test upon its completion and the actual displacement and position of the centre of gravity shall be determined for the light ship condition.

(2)

Where alterations are made to a vessel affecting its light ship condition and the position of the centre of gravity, the vessel shall, if the Administration considers this necessary, be re-inclined and the stability information revised.

(3)

The Administration may allow the inclining test of an individual vessel to be dispensed with provided basic stability data are available from the inclining test of a sister ship and it is shown to the satisfaction of the Administration that reliable stability information for the exempted vessel can be obtained from such basic data.

Regulation 10 Stability information

(1)

Suitable stability information shall be supplied to enable the skipper to assess with ease and certainty the stability of the vessel under various operating conditions. (16)
Such information shall include specific instructions to the skipper warning him of those operating conditions which could adversely affect either the stability or the trim of the vessel. A copy of the stability information shall be submitted to the Administration for approval. (17)

(2)

The approved stability information shall be kept on board, readily accessible at all times and inspected at the periodical surveys of the vessel to ensure that it has been approved for the actual operating conditions.

(3)

Where alterations are made to a vessel affecting its stability, revised stability calculations shall be prepared and submitted to the Administration for approval. If the Administration decides that the stability information must be revised, the new information shall be supplied to the skipper and the superseded information removed.
(16)
See the Guidance on Stability Information contained in recommendation 3 of attachment 3 to the Final Act of the Conference.
(17)
See the Code of Practice concerning the Accuracy of Stability Information for Fishing Vessels adopted by the Organization by resolution A.267(VIII).

Regulation 11 Portable fish-hold divisions

The catch shall be properly secured against shifting which could cause dangerous trim or heel of the vessel. The scantlings of portable fish- hold divisions, if fitted, shall be to the satisfaction of the Administration. (22)
(22)
See appendix V of the Recommendation on Intact Stability of Fishing Vessels adopted by the Organization by resolution A.168(ES.IV), as amended by resolution A.268(VIII).

Regulation 12 Bow height

The bow height shall be sufficient, to the satisfaction of the Administration, to prevent the excessive shipping of water and shall be determined taking account of the seasonal weather conditions, the sea states in which the vessel will operate, the type of vessel and its mode of operation. (25)
(25)
See the Guidance on a Method of Calculation of Bow Height contained in recommendation 4 of attachment 3 to the Final Act of the Conference.

Regulation 13 Maximum permissible operating draught

A maximum permissible operating draught shall be approved by the Administration and shall be such that, in the associated operating condition, the stability criteria of this chapter and the requirements of chapters II and VI as appropriate are satisfied.

Regulation 14 Subdivision and damage stability

Vessels of 100 m in length and over, where the total number of persons carried is 100 or more, shall be capable, to the satisfaction of the Administration, of remaining afloat with positive stability, after the flooding of any one compartment assumed damaged, having regard to the type of vessel, the intended service and area of operation. (28)
(28)
See the Guidance on Subdivision and Damage Stability Calculations contained in recommendation 5 of attachment 3 to the Final Act of the Conference.