Chapter 4C = 0,373 + 0,023 B/T 1 - 0,043 I w / 100The symbols in <strong>the</strong> tables and <strong>for</strong>mula <strong>for</strong> <strong>the</strong> rollingperiod are defined as follows:L W : Length, in m, <strong>of</strong> <strong>the</strong> dock at <strong>the</strong> waterlineT 1 : Mean moulded draught in m, <strong>of</strong> <strong>the</strong> dockA k : Total overall area, in m 2 , <strong>of</strong> bilge keels, orarea <strong>of</strong> <strong>the</strong> lateral projection <strong>of</strong> <strong>the</strong> bar keel,or sum <strong>of</strong> <strong>the</strong>se areas, or area <strong>of</strong> <strong>the</strong> lateralprojection <strong>of</strong> any hull appendages generatingadded mass during dock rollGM : Metacentric height, in m, corrected <strong>for</strong> freesurface effect.Table 2 : Values <strong>of</strong> coefficient X 1B/d X 1≤ 2,4 1,002,5 0,982,6 0,962,7 0,952,8 0,932,9 0,913,0 0,903,1 0,883,2 0,863,4 0,82> 3,5 0,80Note 1:Intermediate values are to be obtained by linear interpolation.Table 3 : Values <strong>of</strong> coefficient X 2C r X 2≤ 0,45 0,750,50 0,820,55 0,890,60 0,950,65 0,97> 0,70 1,00Note 1:Intermediate values are to be obtained by linear interpolation.Table 4 : Values <strong>of</strong> coefficient kA K × 100----------------------L × B0,0 1,001,0 0,981,5 0,952,0 0,882,5 0,793,0 0,743,5 0,72> 4,0 0,70Note 1:Intermediate values are to be obtained by linear interpolation.Table 5 : Values <strong>of</strong> coefficient sT R≤ 6 0,1007 0,0988 0,09312 0,06514 0,05316 0,04418 0,038> 20 0,035Note 1:Intermediate values are to be obtained by linear interpolation.2.1.5 Stability bookletEach floating dock is to be provided with a stability booklet,approved by RINA, which contains sufficient in<strong>for</strong>mation toenable <strong>the</strong> Master to operate <strong>the</strong> dock in compliance with<strong>the</strong> applicable requirements <strong>of</strong> this item [2.1].Where any alterations are made to a dock so as to materiallyaffect <strong>the</strong> stability in<strong>for</strong>mation supplied to <strong>the</strong> Master,amended stability in<strong>for</strong>mation is to be provided. If necessary<strong>the</strong> dock is to be reinclined.Stability data and associated plans are to be drawn up in <strong>the</strong><strong>of</strong>ficial language or languages <strong>of</strong> <strong>the</strong> issuing country. If <strong>the</strong>languages used are nei<strong>the</strong>r English nor French <strong>the</strong> text is toinclude a translation into one <strong>of</strong> <strong>the</strong>se languages.The <strong>for</strong>mat <strong>of</strong> <strong>the</strong> trim and stability booklet and <strong>the</strong> in<strong>for</strong>mationincluded are specified in App 2 <strong>of</strong> Chapter 3 <strong>of</strong> Part B<strong>of</strong> <strong>the</strong> <strong>Rules</strong>, as far as applicable.ks16 <strong>Rules</strong> <strong>for</strong> floating docks 2010
Chapter 42.2 Freeboard2.2.1 The shell freeboard Bl i , which is <strong>the</strong> minimum distance,in millimetres, from <strong>the</strong> floating dock upper deck to<strong>the</strong> waterline with <strong>the</strong> dock at its extreme draft, is to be, ingeneral, not less than 1000 mm. Particular attention is to bepaid to <strong>the</strong> value <strong>of</strong> <strong>the</strong> freeboard Bl i in <strong>the</strong> event that shellopenings not provided with watertight closing appliancesare arranged.The pontoon freeboard Bl e , which is <strong>the</strong> distance, in mm,measured in way <strong>of</strong> <strong>the</strong> longitudinal plane <strong>of</strong> symmetryfrom <strong>the</strong> block deck to <strong>the</strong> waterline, when <strong>the</strong> dock is bearinga load equal to its design capacity, is to be, in general,not less than 300 mm.When <strong>the</strong> block deck is provided with a camber, <strong>the</strong> minimumfreeboard Bl e is to be not less than 75 mm at <strong>the</strong> pontoonside.The floating dock is to be provided with a safety deck sothat, when all <strong>the</strong> ballast tanks located below <strong>the</strong> safetydeck are filled, <strong>the</strong> dock is floating with a draft ensuring aside freeboard Bl i . Alternative solutions to <strong>the</strong> arrangement<strong>of</strong> <strong>the</strong> safety deck, such as <strong>the</strong> arrangement <strong>of</strong> air cushionsbelow <strong>the</strong> upper deck, will be subject to special consideration.2.3 Subdivision2.3.1 GeneralThe dock is to be longitudinally and transversely subdividedinto watertight compartments, in order to make it possibleto safely obtain <strong>the</strong> ballast distributions required in loadconditions and in <strong>the</strong> anticipated service conditions.2.3.2 Extension <strong>of</strong> bulkheadsThe longitudinal and transverse watertight bulkheads are toextend, in height, at least up to <strong>the</strong> safety deck.2.4 Ventilation2.4.1 Quarters, service and machinery spaces and c<strong>of</strong>ferdamsare generally to be provided with natural or <strong>for</strong>cedventilation.Associated air intakes and outlets to <strong>the</strong> open are to bearranged, as far as practicable, at heights not less than thoserequired in Part B <strong>of</strong> <strong>the</strong> <strong>Rules</strong> and are to be provided withcut-draught shutters operable from outside.Particular precautions are to be taken <strong>for</strong> systems servingspaces likely to be contaminated by toxicants or materialswhich may give rise to explosive mixtures with air.2.5 Accessibility <strong>of</strong> spaces2.5.1 All spaces and c<strong>of</strong>ferdams are to be accessible <strong>for</strong>inspection, maintenance and repair.2.6 Corrosion protection2.6.1 All metallic parts are to receive at least two coats <strong>of</strong>antirust paint <strong>of</strong> recognised effectiveness and adhesion.Such coating is not required <strong>for</strong> internal surfaces <strong>of</strong> spacesintended to contain liquid fuel or mineral or vegetable oils.The application <strong>of</strong> paints or o<strong>the</strong>r coatings is to be carriedout in accordance with good practice and coating manufacturerprescriptions and taking into due account <strong>the</strong> compatibility<strong>of</strong> <strong>the</strong> types <strong>of</strong> coatings used in subsequent layers.3 Materials and connections3.1 Steel docks3.1.1 GeneralSteels used <strong>for</strong> <strong>the</strong> construction <strong>of</strong> docks are to comply with<strong>the</strong> requirements indicated in Part D, Ch 2, Sec 1 <strong>of</strong> <strong>the</strong><strong>Rules</strong>, or to have equivalent characteristics, at <strong>the</strong> discretion<strong>of</strong> RINA.Connections <strong>of</strong> <strong>the</strong> various parts are to be carried out incompliance with <strong>the</strong> requirements <strong>of</strong> Part B, Ch 12, Sec 1 <strong>of</strong><strong>the</strong> <strong>Rules</strong>.3.1.2 Grades and types <strong>of</strong> steelDepending on <strong>the</strong> types <strong>of</strong> steel, <strong>the</strong> grades to be used arein general those given in:• Tab 6 <strong>for</strong> <strong>the</strong> shell <strong>of</strong> <strong>the</strong> safety deck and <strong>the</strong> upper platingstrake <strong>of</strong> wing walls contributing to longitudinalstrength and• Tab 7 <strong>for</strong> <strong>the</strong> remaining elements contributing to longitudinalstrength, not included in <strong>the</strong> above, but <strong>of</strong> particularlocal importance.For structural elements not included among those consideredin Tab 6 and Tab 7, steel grades A, B or AH are to beused, irrespective <strong>of</strong> <strong>the</strong> thickness.Wherever necessary, steels <strong>of</strong> higher grades than those mentionedabove may be required by RINA.Table 6 : Grades <strong>of</strong> steel to be used <strong>for</strong> <strong>the</strong> shell <strong>of</strong> <strong>the</strong> safety deck and <strong>the</strong> upper plating strake <strong>of</strong> wing walls contributingto longitudinal strengthThickness s ≤ 20 mm 20 < s ≤ 25 mm 25 < s ≤ 40 mm s > 40 mmNormal strength A and B B D EHigher strength steels AH AH DH EH<strong>Rules</strong> <strong>for</strong> floating docks 2010 17