The electronic pdf version of this document found through is the officially binding version. OFFSHORE STANDARD. DNV-OS-C If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall. DNV GL rules for classification: High speed and light craft (RU-HSLC) Maritime > DNV GL offshore standards (OS) > Document code: DNVGL-OS-C
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Examples of typical local structural capacity assessment are: In such cases the b combination is dimensioning.
DNV-OS-C Structural Design of Offshore Ships_百度文库
D Fatigue loads An overview of fnv loads is given in Sec. It is generally acceptable to consider the ballast and the fully loaded condition with appropriate amount of time in each condition.
The following matters should be taken into consideration to be able to carry out condition monitoring on location: This implies that the requirements given in Ch. The longitudinal and transverse stresses shall be based on consistent loads using actual internal and external pressures corresponding to the worst combination of still water loads and wave position. General A Area of application for Ch. These measures include bow shape design, bow flare, bulwarks and other protective structure.
The extent of the supporting structure is limited to the structural members affected by the local loads from the topside structure. The unit model should be equipped with load cells on the weather deck at positions of dng structural members or critical topside equipment.
DNV GL rules and standards
The requirements given in Ch. Collision and Accidental Flooding Environmental Loads C Dbv Definitions, general considerations and required methodology for determination of environmental loads are given in Ch. The transfer function for the dynamic pressure can be used to calculate local stress transfer functions. E Green water The green water is the overtopping by water in severe wave conditions.
The expected dynamic load history shall be the basis for the calculations. Oos Classification C. No direct calculations of wave bending moments and shear forces are required in such cases.
Green sea loads is considered as local loads, but shall be combined with the effect from global response. A design fatigue factor of 1. The bilge keel shall be welded directly onto the shell plate without doubling plates. In order to cover typical unit structural details, the design should allow for the following stress concentration factors: The loads due to ship motions shall be determined from the wave load analysis employing a viscous damping coefficient representative for seastates which contribute most to dnvv damage.
Definitions B Benign waters Benign waters is defined as the environments where required hull girder capacity calculated according to the LRFD method is less than the minimum section modulus calculated according to the main class requirements. The characteristic ultimate longitudinal compression stress for each panel in corresponds to the buckling capacity of the panel when exposed to design transverse stresses, shear stress and lateral pressure.
Particular attention should be given to the following details: In particular load so due to the following shall be accounted for in the design: In this provision “Det Norske Veritas” shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas.
B Longitudinal strength The effect of dnnv openings in the hull e. A Material classes A Design temperatures External structures above the f102 ballast waterline shall be designed for temperatures equal to ddnv lowest daily mean temperature for the area s in which the unit is specified to operate.
Design Loads for Minimum Structural Capacity B General principles To define the minimum design basis, the design sea pressures and pressures from liquid in tanks according to the Rules for Classification of Ships Pt.
Topside Facilities Structural Support E General Cnv supporting structure is defined as the area where the stress pattern in the structural elements is significantly affected by the topside loads.
B Fillet welds and deep penetration welds subject to high tensile stresses Dimensioning of such welds are referred to Rules for Classification of Ships Pt.
The minimum required midship section modulus and moment of inertia may, in such cases, be reduced. A Objectives The objectives of this standard are to: The units normally consist of a hull, with turret, and production equipment on the deck. D Calculation of global dynamic stress is Global stress ranges shall be determined from the global hull bending stresses, axial stresses and torsional stresses.
Fore and Aft Ship Site specific environmental data shall be used for calculation of long term stress range distribution. Loss of Heading Control B Alternative 2 – Hull girder capacity based on direct calculations of wave loads If the hull girder capacity is to be based on calculated wave loads according to the principles given in Ch.
The roll damping shall be evaluated for the return period in question. It implies that all elements are accessible for inspection and repair. Inspection and Maintenance B Facilities for inspection on location Inspections may be carried out on location based on approved procedures outlined in a maintenance system and inspection arrangement, oz interrupting the function of the unit.
The non-linear correction factors for unconventional hull forms shall be documented by direct calculations. Fatigue Assessment C General Dnvv fatigue capacity shall be assessed according to the principles given in Ch. Fatigue Assessment C General principles Fatigue c1022 shall be carried out according to Clas- sification Note The unit is equipped for crude oil storage.
Topside Facilities Structural Support The buckling capacity of each panel shall be determined according to Classification Note General Application and Assumptions If the bilge keel is of d102 closed construction type, the transfer functions for stress responses from the wave dynamics and motion induced drag forces shall be determined separately.
However, the design bow impact pressure for local panel design shall be taken as: C Global shear stresses B. For details not covered by Classification Note