RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

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Amended July 2011, see page 3 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011Pt.3 Ch.1 Sec.2 – Page 19Fig. 8Sea load distribution factor502 The design pressure on superstructure end bulkheads and deckhouses shall not be taken less than:P min = 5 + (5 + 0.05 L) sin α (kN/m 2 )for lowest tier of unprotected frontP min =5 (kN/m 2 ) for aft end bulkheadsP min = 5 + 0.025 L sin α (kN/m 2 ) elsewherewhere α is the angle between the bulkhead/side and deck.h o , C W and k s as given in 501.a= 2.0 for lowest tier of unprotected fronts= 1.5 for deckhouse fronts= 1.0 for deckhouse sides= 0.8 elsewhere.503 The design pressure on watertight bulkheads (compartment flooded) shall be taken as:p = 10 h b (kN/ 2 )h bp = a k s ( C W – 0.67 h 0 ) ( kN ⁄ m 2 )= vertical distance in m from the load point to the top of bulkhead or to flooded waterline, if deeper.504 The design pressure on deck or inner bottom forming part of watertight bulkhead shall not be less thanfor the bulkhead at same level.C 600 Liquids601 Tanks for bunkers and tank bulkheads shall normally be designed for liquids of density equal to that ofsea water, taken as ρ = 1.025 t/m 3 (i.e. ρ g 0 ≅ 10).602 The pressure in tanks shall be taken as the greater of:p = ρ (g 0 + 0.5 a v ) h s (kN/m 2 )p = 0.67 ρ g 0 h p (kN/m 2 )DET NORSKE VERITAS AS
Rules for High Speed, Light Craft and Naval Surface Craft, January 2011 Amended July 2011, see page 3Pt.3 Ch.1 Sec.2 – Page 20p = ρ g 0 h s + 10 (kN/m 2 ) for L ≤ 50mp = ρ g 0 h s + 0.3 L – 5 (kN/m 2 ) for L > 50ma v = as given in B200h s = vertical distance in m from the load point to the top of tankh p = vertical distance in m from the load point to the top of air pipe or filling station.For tanks which may be filled to top of air pipe or filling station and subsequently subjected to accelerations,the pressure shall be modified accordingly.603 The design pressure on wash bulkheads is given by:p = 3.5 l t (kN/m 2 )l t = the greater distance in m to the next bulkhead forward or aft.For wash bulkhead plating, requirement to thicknesses may have to be based on the reaction forces imposed onthe bulkhead by boundary structures.C 700 Dry cargo, stores and equipment701 The pressure on inner bottom, decks or hatch covers shall be taken as:p = ρ H (g 0 + 0.5 a v ) (kN/m 2 )a v = as given in B200H = stowage height in m.Standard values of ρ and H are given in Table C2.If decks (excluding inner bottom) or hatch covers are designed for cargo loads heavier than the standard loadsgiven in Table C2, the notation dk (+) or ha (+), respectively, will be entered in the Register of Ships. Thedesign cargo load in t/m 2 will be given for each individual cargo space in the “Appendix to ClassificationCertificate”.702 When the weather deck or weather deck hatch covers are designed to carry deck cargo, the pressure is ingeneral to be taken as the greater of p according to 500 and 700.703 For transverse bulkheads in way of general cargo holds, the design loads given for watertight bulkheadsapply.Table C2 Standard load parametersDecksWeather deck and weather deck hatchcovers intended for cargoSheltered deck, sheltered hatch coversand inner bottom for cargo or storesParametersρ H = 1.0 t/m 2ρ = 0.7 t/m 3Platform deck in machinery space ρ H = 1.6 t/m 2Accommodation decksH = vertical distance in m from the load point to the deck above. For loadpoints below hatchways H shall be measured to the top of coamingρ H = 0.35 t/m 2 , when not directly calculated, including the deck's own mass.Minimum 0.25 t/m 2 .C 800 Heavy units801 Heavy units The vertical force acting on supporting structures from rigid units of cargo, equipment orother structural components shall normally be taken as:P v = (g 0 + 0.5 a v ) M (kN)M = mass of unit in tonnesa v = as given in B200.DET NORSKE VERITAS AS
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RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

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