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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For evaluation of slamming, sloshing and green water effects, see Sec.

Environmental Loads C General Definitions, general considerations and required methodology for determination of environmental loads are given in Ch. D Combination of stress components The following dynamic dhv shall be included in a FLS analysis as relevant: The loads due to ship motions shall be determined from the wave load analysis employing a viscous damping coefficient 1c02 for seastates which contribute most to fatigue damage.

The longitudinal and transverse stresses shall is based on consistent loads using actual internal and external pressures corresponding to the worst combination of still water loads and wave position. Turret and Moonpool Areas Design Basis A Operational modes A unit shall be designed for all relevant modes of operation. Introduction A General The requirements and guidance given in this Appendix are supplementary requirements for units that are intended to stay on location for prolonged periods.

In particular load combinations 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.

A component based stochastic analysis implies that non linear effects can be applied to the relevant load component. Provide technical provisions and acceptance criteria for general use by the offshore dn as well as 1c02 technical basis for DNV offshore services.


Design Fatigue Factors B General Units covered by this standard have considerable redundancy. Fatigue Assessment C General principles Fatigue capacity shall be carried out according to Clas- sification Note Transverse Structural Strength C General Transverse strength means the strength of main transverse members such as transverse bulkheads and o frames. Both a and b combinations shall be considered. The Rules for Classification of Ships differentiate between ordinary sloshing loads snv and sloshing impact loads.

E Mooring loads A unit may be kept on location by various methods.

DNV GL rules and standards

Fore and Aft Ship E. 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 minimum required midship section modulus and moment of inertia may, in such cases, be reduced. The units normally consist of a hull, with turret, and production and drilling equipment on the dn.

Information on the joint probability of the various environmental loads may be taken into account if such information is available and can be adequately documented.

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.

Such loads may comprise the following: The damping coefficient should be determined at probability of exceedance. Dbv of Heading Control The shear force shall be corrected according to Rules for Classification oe Ships Pt.

Loads used in the global check shall be consistent. The unit model should be equipped with load cells on the weather deck at positions of critical structural members or critical topside equipment.

B Hull girder bending capacity Gross scantlings may be utilised in the calculation of hull structural resistance, provided a corrosion protection system in accordance with DNV-OS-C, is maintained. The load effects of process equipment and deck loads shall be included. A Assumptions It is assumed that the units will follow the normal class survey periods including regular dry-docking for inspection and maintenance.


DNV-OS-C Structural Design of Offshore Ships_百度文库

Strip theory may be used provided: 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. Provide principles dng procedures of DNV c120, certification, verification and so services. It implies that all elements are accessible for inspection and repair. The S-N curves for air or corrosive environments used should consider the condition of the unit with respect to corrosion, original corrosion protection system and the corrosion protection system after the conversion.

All stresses and pressure shall be based on an annual probability of exceedance of The effect of mean stresses should normally be ignored. The buckling capacity of each panel shall be determined according to Classification Note General A Area of application for Ch.

Longitudinal Strength B Alternative 1 – Complying with the main class requirements If the c012 girder capacity is to be based on the main class requirements, the midship section modulus and moment of inertia shall comply with D Calculation of global dynamic stress ranges Global stress ranges shall be determined from the global hull bending stresses, axial stresses and torsional stresses.

Typical extent of the model is three cargo tanks. Shear lag effects and stress concentrations shall be considered. Sufficient margin in respect to the lowest inspection waterline should however be considered depending on the expected wave heights during the inspection periods. The transverse strength shall meet the requirements given in the Rules for Classification of Ships Pt.

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