Key Benefits:
The International Convention on Freight Lines of 1966 ("Official State Gazette" number 192 of 10 August 1968) lays down uniform principles and rules for the limits to which ships can be loaded. taking into account the need to safeguard lives and property at sea.
Rule 27 of this Convention, which regulates the criteria for allocating the freeboard, presents, in practice, certain difficulties in its uniform interpretation, which induced the Contracting Governments to adopt in the Fourth (1971) the Intergovernmental Maritime Consultative Organisation, which would deposit the Convention, a recommendation on the uniform interpretation and application of the said rule. The experience gained with this measure moved the same Organization, in its Ninth Assembly (1975), to adopt a rule equivalent to Rule 27 of the Convention, which annuls and replaces that recommendation, in accordance with the provisions of Article 8,
The proven advantages that in certain cases involve the application of this equivalent rule advise their adoption for national ships, so, at the proposal of the General Direction of the Merchant Navy, this Ministry has had the right to have:
First.-It is approved, as equivalent to Rule 27 of the International Convention on Load Lines of 1966, contained in the Annex to this Order.
Second.-The calculations for the determination of the freeboard of new ships, or of the existing ones to be issued new certificate of freeboard as a consequence of having been the subject of reforms that affect their cargo lines, may be made, from the date of the publication of this Order, in accordance with Rule 27 of the International Convention on Load Lines of 1966 or following the equivalent rule contained in the Annex to this Order. In the case of renewal of existing freeboard certificates, the same equivalent rule may also apply at the request of the shipowner.
Madrid, 30 March 1982.-P. D., the Undersecretary of Transport, Tourism and Communications, Carlos Merino Vázquez.
ANNEX.-Rule equivalent to Rule 27 of the International Convention on Load Lines of 1966
VESSEL TYPES
1. For the purposes of the calculation of freeboard the vessels shall be divided into type and type .
2. Ship of type is all that:
a) It is designed to carry only liquid bulk cargoes.
b) It has a high integrity of the cover exposed to the weather, with only small openings of access to the load compartments, closed by tight caps of steel or equivalent material, and
c) Has a low permeability in the load-filled spaces.
4. A vessel of type shall be assigned a freeboard not less than that based on Table A of Rule 28.
Ships of type
5. All ships that do not meet the conditions required for ships of type in paragraphs 2 and 3 of this rule will be considered ships of type .
6. For ships of type having in class 1-class locations, hatches that meet the requirements of Rule 15, except those of paragraph 7, shall be assigned freeboard-based freeholders based on the values of Table B of Rule 28, increased in the values given by the following table:
Increase of the freeboard on the tabular freeboard for ships type whose hatch covers do not comply with the provisions of rules 15, 7), or 16
Vessel Length-Meters * Freeboard Increment-Milimeters *
108 and lower * 50 *
109 * 52 *
110 * 55 *
111 * 57 *
112 * 59 *
113 * 62 *
114 * 64 *
115 * 68 *
116 * 70 *
117 * 73 *
118 * 76 *
119 * 80 *
120 * 84 *
121 * 87 *
122 * 91 *
123 * 95 *
124 * 99 *
125 * 103 *
126 * 108 *
127 * 112 *
128 * 116 *
129 * 121 *
130 * 126 *
131 * 131 *
132 * 136 *
133 * 142 *
134 * 147 *
135 * 153 *
136 * 159 *
137 * 164 *
138 * 170 *
139 * 175 *
140 * 181 *
141 * 186 *
142 * 191 *
143 * 196 *
144 * 201 *
145 * 206 *
146 * 210 *
147 * 215 *
148 * 219 *
149 * 224 *
150 * 228 *
151 * 232 *
152 * 236 *
153 * 240 *
154 * 244 *
155 * 247 *
156 * 251 *
157 * 254 *
158 * 258 *
159 * 261 *
160 * 264 *
161 * 267 *
162 * 270 *
163 * 273 *
164 * 275 *
165 * 278 *
166 * 280 *
167 * 283 *
168 * 285 *
169 * 287 *
170 * 290 *
171 * 292 *
172 * 294 *
173 * 297 *
174 * 299 *
175 * 301 *
176 * 304 *
177 * 306 *
178 * 308 *
179 * 311 *
180 * 313 *
181 * 315 *
182 * 318 *
183 * 320 *
184 * 322 *
185 * 325 *
186 * 327 *
187 * 329 *
188 * 332 *
189 * 334 *
190 * 336 *
191 * 339 *
192 * 341 *
193 * 343 *
194 * 346 *
195 * 348 *
196 * 350 *
197 * 353 *
198 * 355 *
199 * 357 *
200 * 358 *
The francobordos corresponding to intermediate sling will be obtained by linear interpolation.
The freeboard of the vessels of more than 200 meters in length will be fixed by the Administration.
7. Vessels of type having class 1 hatches with lids that meet the requirements of rules 15, 7) or 16 shall be assigned to them, except as provided in paragraphs 8 to 13, including, of this rule, based on in table B of rule 28.
8. A vessel of type , more than 100 meters long, will be able to assign a smaller freeboard than the one required in paragraph 7 of this rule, provided that, in relation to the reduction granted, the Administration considers that:
(a) The measures envisaged for the protection of the crew are appropriate.
b) The drain devices are suitable.
c) The hatches located in class 1 and 2 locations satisfy the provisions of Rule 16 and have adequate resistance, with particular attention being paid to their sealing and fastening devices.
(d) The ship, when loaded to its summer flotation line, may withstand the flooding of any compartment or compartments, with an assumed permeability of 0,95, in accordance with the breakdown scenarios specified in paragraph 12 of this rule, and remain afloat in a satisfactory equilibrium condition, as specified in paragraph 13 of this rule. In any such vessel, if it is more than 225 metres in length, the machinery space will be treated as a flood compartment, but with a permeability of 0.85.
9. When calculating the freeboard for ships of type which meet the requirements of paragraphs 8, 11, 12 and 13 of this Regulation, the values in Table B of Rule 28 shall not be reduced by more than 60 per 100 of the difference between the values and corresponding to the ship's length.
10. (a) The reduction in tabular freeboard granted in accordance with paragraph 9 of this rule may be increased to the total difference between the values in Table A and Table B of Rule 28, provided that the vessel meets the requirements of:
i) Rule 26, except paragraph 4, as if it were a vessel of type .
ii) Paragraphs 8, 11, and 13 of this rule; and
(iii) Paragraph 12 of this rule, of course, a breakdown in a transverse bulkhead of any length along the length of the vessel, so that two compartments adjacent to the bow and aft are flooded simultaneously, except for: that such failure shall not apply to the bulkheads of a machinery space.
(b) In any vessel of this type, with an overall length of more than 225 metres, the machinery space shall be treated as a flood compartment, but with a permeability of 0,85.
Initial load condition
11. The initial loading condition before the flood shall be determined as follows:
a) The ship is loaded up to its summer flotation line and keel at level.
b) When calculating the vertical center of gravity, the following principles apply:
i) A homogeneous load is transported.
(ii) All cargo compartments, except those referred to under paragraph (iii) of this sub-paragraph, but including compartments to be partially filled, shall be deemed to be fully loaded, but in the Case of fluid loads each compartment shall be considered full to 98 per 100.
iii) If the ship is projected to navigate to its summer load line with empty compartments, such compartments will be considered empty, of course the height of the center of gravity calculated in this way is not less than calculated in accordance with paragraph (ii) of this sub-paragraph.
iv) It will be assumed that each of the tanks and spaces destined to contain liquid and solid consumption is full 50 per 100 of its capacity. It shall also be assumed that, for each class of liquids, at least a pair of symmetrical side tanks or a single central tank have the maximum free surface, and the tank or combination of tanks to be taken into account shall be that whose effect The volume centre of the tank shall be taken as the centre of gravity of the contents of each tank. The remaining tanks shall be completely empty or full, and the distribution of consumable liquids between these tanks shall be carried out in such a way as to obtain the highest possible height of the centre of gravity on the keel.
v) In each compartment containing liquids as prescribed in paragraph (ii) of this sub-paragraph, the maximum effect of free surfaces shall be taken into account for an angle of heel not greater than 5, apart from the case of compartments containing consumable fluids, as prescribed in paragraph (iv) of this sub-paragraph.
Alternatively, the actual effects of the free surfaces may be used, provided that the calculation methods are acceptable to the Administration.
vi) The weights will be calculated from the following values of the specific weights:
Saltwater 1.025
Sweet Water 1,000
Fuel-oil 0.950
Diesel-oil 0.900
Lubricating Oil 0.900
Fault Hypothesis
12. The following principles shall apply with regard to the characteristics of the alleged fault:
a) The vertical extent of the fault will be in all cases from the baseline, without limit.
(b) The transverse extent of the fault is equal to B/5 or 11,5 metres, if this value is smaller, measured inwards from the side of the vessel, perpendicular to the longitudinal line of symmetry at the level of the float in charge Summer.
c) If a fault of a minor extent specified in sub-paragraphs (a) and (b) of this paragraph gives rise to a more severe condition, the indicated minor extension shall be assumed.
(d) Except in cases where paragraph 10 (a) requires otherwise, the flooding shall be limited to a single compartment between adjacent transverse bulkheads, provided that the inner longitudinal boundary of the compartment is not included in the cross-sectional extension of the alleged fault. The transverse boundary bulkheads of the side tanks which do not extend over the entire sleeve of the vessel shall not be damaged, of course extending beyond the transverse extent of the alleged fault, as prescribed in sub-paragraph (b). of this paragraph.
If in a transverse bulkhead there are niches or bayonets of length not greater than 3,05 meters located within the transverse extent of the alleged fault, as defined in sub-paragraph (b) of this paragraph, such transverse bulkhead may be considered intact and the adjacent compartment may be singularly inundating. However, if within the transverse extent of the alleged fault there is a niche or bayonet of 3,05 metres in length in a transverse bulkhead, the two compartments adjacent to this bulkhead shall be considered to be flooded. The bayonet formed by the bulkhead of the stern and the roof of the same scratch shall not be regarded as bayonet for the purposes of this rule.
e) If a main transverse bulkhead is located within the transverse extent of the alleged fault and has a bayonet of more than 3.05 metres in the area of a double bottom tank or side tank, the tanks Side or double bottom adjacent to the bayonet of the main transverse bulkhead shall be considered to be flooded at the same time. If this side tank has openings inside one or more holds, such as grain feeders, such a hold or holds will be considered flooded at the same time. Similarly, in a vessel designed for the transport of liquid loads, if a side tank has openings within adjacent compartments, such adjacent compartments will be considered empty and flooded simultaneously. This requirement is applicable even when such openings are provided with closing devices, except in the case of gate valves arranged in the bulkheads between tanks and the valves being controlled from the deck. Record caps with unseparated bolts are considered to be equivalent to the intact bulkhead, except in the case of openings in high side tanks, which cause these tanks and the holds to be in communication.
f) When considering the flooding of two adjacent compartments longitudinally, the minimum separation between the main transverse watertight bulkheads shall be 1/3 L2/3, or 14,5 metres if this value is lower, to be considered effective. Where the transverse bulkheads are less separate, one or more of these bulkheads shall be assumed to be non-existent to obtain the minimum spacing between bulkheads.
Balance condition
13. The balance condition after the flood shall be deemed satisfactory provided that:
(a) The final waterline after the flood, taking into account the sinking, the heel and the seat, is below the lower edge of any opening through which a flood may take place. progressive. These openings shall include air pipes, fans and closed openings by means of watertight doors (even if they satisfy Rule 12) or hatch covers (even if they satisfy Rule 16 or Rule 19, 4), and may Exclude those closed openings by means of registration caps and cover-flush ports which comply with Rule 18, load-haters caps of the type described in Rule 27, 2, hinged doors of hinge on an approved site which remain firmly closed during the voyage by the sea, which must be recorded in the logbook, distance-operated sliding doors and side-hammers of the fixed type (which comply with Rule 23).
(b) If there are tubes, pipes or tunnels located within the assumed extent of penetration of the fault defined in paragraph 12 (b) of this rule, measures shall be taken to ensure that the progressive flooding cannot be extended by this reason for compartments other than the inundable assumptions in the calculation for each failure case.
c) The angle of the scora produced by asymmetric flooding does not exceed 15 degrees. If no part of the cover is submerged, an angle of up to 17 degrees can be accepted.
d) The metacentric height in the flooded vessel condition is positive.
e) When any part of the cover outside the assumed compartment flooded in a particular failure case is submerged, or in any case where the stability margin in the condition of the condition of the case may be considered to be doubtful Vessel flooded, residual stability investigated. It shall be considered sufficient if the bending arm curve has a minimum extension of 20 degrees beyond the equilibrium position, with a maximum of 0,10 metres at least within this extension. The area under the bending arms curve within this extension shall not be less than 0,0175 radians. The Administration shall take into account the possible danger caused by protected or unprotected openings which may be temporarily submerged within the extension of positive residual stability.
f) The Administration considers stability to be satisfactory during the intermediate stages of the flood.
Vessels with no means of propulsion
14. Barges, barges and other vessels without their own means of propulsion shall be assigned to them in accordance with the provisions of these rules. Gabarras that meet the requirements of paragraphs 2 and 3 of this rule may be assigned freeboard of the type .
(a) The Administration shall in particular consider the stability of the barges with cargoes on the cover in the open. Only the barges to which the ordinary freeboard of type is assigned may be transported on deck.
(b) However, in the case of unmanned barges the requirements of rules 25, 26, 2 and 3, and 39 shall not apply.
(c) Unmanned barges having only small access openings closed by steel-tight lids or equivalent material, provided with packings on the freeboard cover, may be assigned a freeboard a 25 per 100 lower than that calculated according to these rules.
