Pt B, Ch 1, Sec 5<strong>SECTION</strong> 5CONNECTION WITH PART C1 General1.1 Applicationdesign process, are directly influencing the design optionsfor systems covered by Part C, or some statutory matters.The following requirement [1.2.2] outlines the most importantsuch inter linked options.1.1.1 The present Section deals with the interconnectionand the inter linked requirements of Part B and Part C of thepresent Rules.1.2 Inter linked requirements1.2.1 GeneralPart B of the present Rules deals with the naval architectureof the yacht design (structure and stability). The requirementstherein are generally applicable from the very beginningof the Class design review.Part C of the present Rules deals with the systems fitted onboard the yacht, for propulsion, piping and associated functions,for power generation and control and for fire safety.Attention of designers is drawn on fact that some navalarchitecture options, that may be decided early in the1.2.2 Inter linked requirementsThe most important inter linked options of the various Partsof the Rules are given in Tab 1.Table 1 : Inter linked requirementsNaval architectureoptionType of hull (mono - multi)Type of propulsion (motor - sail)Hull materialWatertight bulkheads(distribution and arrangement)Openings in hull(1) If relevantInter linked systemsoptionsPower generationEmergency sourceFire safetyPiping materialsDamage stabilityDamage stabilityLoadline (1)76 Bureau Veritas Rules for Yachts July 2006 with February 2008 Amendments
Pt B, Ch 10, Sec 5<strong>SECTION</strong> 5INDEPENDENT TANKSSymbolsL : Rule length as defined in Ch 1, Sec 2, [3.2]x : Longitudinal position, in m, taken from the aftend AE as defined in Ch 1, Sec 2, [3.4.2].1 General1.1 Application1.1.1 The present section deals with scantlings of independenttanks, in steel, aluminium alloys or composites.1.2 General1.2.1 The connections to reinforced hull structures of independenttanks are to be able to withstand the reactionsinduced by the tank weight.For that purpose, the dynamic amplification due to behaviourof yacht at sea is to be taken into account for highspeed motor yachts as defined in Ch 5, Sec 1, [2] and formonohull sailing yachts. For such yachts, the tank weight isto be taken as W D , where:• W D : Dynamic weight of the tank, taken equal to(1 + 0,4 a V )W : Maximum static weight of the tanka V : Vertical acceleration resulting from effect ofheave and pitch, equal to:a v = 2 . x/L . a CG , for high speed motoryacht, without being less than a CG , wherea CG is defined in Ch 5, Sec 1, [2.1.7]a v = a H + a P , for monohull sailing yacht ,where a H and a P are defined in Ch 5, Sec 1,[2.2].2 Steel and aluminium tanks2.1 General2.1.1 In case of gas-oil or diesel-oil aluminium tanks, it isreminded that careful attention is to be paid to welds, asrepairs are made very difficult due to degreasing difficulty.2.2 Plating2.2.1 The rule thickness of independent tank plates isgiven, in mm, by the formulae:t = 22, 4⋅ μ ⋅ s ⋅p-------σ adwhere:s : Smaller side, in m, of the elementary platepanelμ : Aspect ratio coefficient of the elementary platepanel, equal to:without being taken more than 1, where:l : Longer side, in m, of the elementaryplate panelp : <strong>Design</strong> pressure, or testing pressure, in kN/m 2 ,given in Ch 7, Sec 1, [5]σ ad : Rule admissible stress, in N/mm 2 , defined in Ch4, Sec 3, Tab 2 or Ch 4, Sec 3, Tab 4 whateverthe caseChecking of plate thickness against design pressureis to be performed with admissible localbending stress induced by local hydrodynamicloads.Checking of plate thickness against testing pressureis to be performed with admissible localbending stress induced by tank testing loads.2.2.2 A local increase in plating thickness is generallyrequired in way of pipe penetration.2.3 Stiffenerss 2l 21, 1 – ⎛0,5 ⋅ ---⎞⎝ ⎠2.3.1 As a rule, the design section modulus Z, in cm 3 , ofindependent tank ordinary stiffeners is given by the formulae:Z 1000 ⎛ s1 – -------- ⎞ p ⋅s ⋅l 2= ⋅ ⋅ -----------------⎝ 2 ⋅ l⎠m ⋅σ adwhere:l : Span of the siffener, in m, measured as indicatedin Ch 4, Sec 4, [3]s : Spacing between siffeners, in mp : design pressure, or testing pressure, in kN/m 2 ,as given in Ch 7, Sec 1, [5]σ ad : Rule admissible stresses, in N/mm 2 , defined inCh 4, Sec 3, Tab 2 or Ch 4, Sec 3, Tab 4 whateverthe caseChecking of stiffener section modulus againstdesign pressure is to be performed with admissiblelocal bending stress induced by local hydrodynamicloads.Checking of stiffener section modulus againsttesting pressure is to be performed with admissiblelocal bending stress induced by tank testingloads.m : Coefficient depending on end conditions, equalto 12, 10 or 8, as defined in Ch 4, Sec 4, [3.2.5].244 Bureau Veritas Rules for Yachts July 2006 with February 2008 Amendments
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