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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The selected design principles shall be consistent. With reference to the application of material classes as given in the Rules for Classification of Ships Pt. These measures include bow shape design, bow flare, bulwarks and other protective structure.
If djv shear capacity of a longitudinal element is carried out by use of dng recognised means, the yield capacity should also be considered in the buckling check. The number of panels in each longitudinal shear element should be sufficient to describe the shear distribution in the element and to account for plate thickness variation.
The loads due to ship motions shall be determined from the wave load analysis employing a viscous damping coefficient c012 for seastates which contribute most to fatigue damage. It is generally acceptable to consider the ballast and the fully loaded condition with appropriate amount of time in each condition. In general, the global and the local stress components differ in amplitude and phase.
The transverse strength shall meet the requirements given in the Rules for Classification of Ships Pt.
Information on the joint probability of the various environmental loads may be taken into account if such information dvn available and can be adequately documented. Topside Facilities Structural Support E Dnnv The supporting structure is defined as the area where the stress pattern in the structural elements is significantly affected by the topside loads.
However, the compensation shall not exceed an amount dng to ten times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million. G Safety assessment Accidental events that will be a basis for the design shall be stated in the design brief. Global shear capacity check can in principle be carried out in the same manner as the global moment capacity check since all stress components and lateral pressure are included in the capacity check of each panel.
However, in the sections with the highest shear stresses, an acceptable procedure will be to carry out one moment capacity check for each local panel for the design wave resulting in maximum bending moment combined the associates shear stress, and one shear capacity check according to equation in based on maximum section shear force and associated bending moment. The midship section moment of inertia about the transverse neutral axis is not to be less than: A component stochastic analysis as described in Classification Notes Strength Assessment B Compliance with main class requirements The requirements given in this standard are supplementary to the requirements for main class.
A component based stochastic analysis implies that non linear effects can be applied to the relevant load component. Each mooring system configuration will impose loads on the hull structure. B Full penetration welds Full penetration welds are in any case to be used in the following connections: Normally m is considered sufficient margin on the lowest inspection waterline in world wide operation.
D Topside structures The following loads shall be considered for the topside structure: The minimum required midship section modulus and moment of inertia may, in such cases, be reduced. Each of such elements should be considered separately subjected to the shear force in the element. The unit model should be equipped with load cells on the weather deck at positions of critical structural members or critical topside equipment. Calculation of Fatigue Damage E Environmental loads Fatigue analyses shall be based on the site specific environmental data and, take appropriate consideration of both global and local e.
As a minimum, the oz dynamic local stress components shall be considered: In order to cover typical unit structural details, the design should allow for the following stress concentration factors: 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.
The expected dynamic load history shall be the basis for the calculations. The units normally consist of a hull, with turret, and production and drilling equipment on the deck. The shear force shall be corrected according to Rules for Classification of Ships Pt. This implies that the unit shall comply with the main class requirements for the midship section modulus.
Definitions C Floating storage and offloading units A floating production, drilling, storage and offloading unit can be relocated, but is generally located on the same location xnv a prolonged period of time. DNV undertakes classification, certification, and other verification and consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research in relation to these functions. Topside Facilities Structural Support Selection of Material A General A material specification shall be established for all structural materials.
Examples of welds in this category are: The following list contains typical areas which should be considered: The units normally consist of a hull, with turret, and production equipment on the deck.
DNV GL rules and standards
The units normally consist of a hull with moonpool and drilling equipment on the deck. Collision with supply boat and accidental flooding are thus not considered in this standard. The characteristic ultimate shear stress for each panel in corresponds to the buckling capacity of the panel when exposed to design longitudinal and transverse stresses and lateral pressure.
C Mooring loads Mooring loads are to be determined according to Ch. Collision and Accidental Flooding DNV Offshore Codes consist of a three level hierarchy of documents: In addition the local dn shall be considered for the special load cases as defined in Sec.
DNV-OS-C Structural Design of Offshore Ships_百度文库
A Special category – typical locations The following locations are considered special category: C Drilling vessels A drilling vessel is generally operating on the same location for a limited period of time.
The Rules for Classification of Ships differentiate between ordinary sloshing loads non-impact and sloshing impact loads. The unit may also be equipped for limited oil storage for testing. The structural strength shall be evaluated considering all relevant, realistic load conditions and combinations, see Sec.
These loads shall be considered in the structural design of the unit, and combined with other relevant load components. The design pressure on topside support structure, unprotected bulkheads of deck houses and superstructures located forward of oz.
Design Fatigue Factors B General Units covered by this standard have considerable redundancy.