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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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Fatigue Assessment C General principles Fatigue capacity shall be carried out according to Clas- sification Note E Partial load coefficients The partial load coefficients to be used are given in Table Dvn. The units normally consist of a hull with moonpool and equipment for well stimulation or maintenance e. DNV Offshore Codes are offered within the following areas: Each of such elements should be considered separately subjected to the shear force in the element.

Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards. 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. However, the design bow impact pressure for local panel design shall be taken as: The design pressure on topside support structure, unprotected bulkheads of deck houses and superstructures located forward of 0.

The transverse strength shall meet the requirements given in the Rules for Classification of Ships Pt. 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. C Green water The effect of green water on weather deck and dng deckhouses shall be considered according to Ch. The selected design principles shall be consistent.

B Longitudinal strength The effect of large openings in the hull e.

The crude oil may be transported to shore by shuttle tankers via an offloading arrangement. Benign waters is in this context 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. Strength Assessment Principles B General procedure Subsection B applies to units where the global hull capacity based f102 the main class requirements is sufficient North Atlantic at a probability of exceedance of corresponding to 20 years return period.


DNV GL rules and standards

Collision and Accidental Flooding D. In the evaluation of the most unfavourable direction, account shall be taken of relative angular motion of the unit in addition to possible line lead directions. For evaluation of slamming, sloshing and green water effects, see Sec.

Hull Girder Longitudinal Strength B Dnvv girder yield check The global hull and main girder system nominal stresses derived from direct strength calculations shall comply with the ls criteria given below: All changes affecting DNV Offshore Codes that have not been reprinted, are published separately in the current Amendments and Corrections, issued as a printable pdf file. The units normally consist of a hull with moonpool and drilling equipment on the deck.

Particular attention should be given to the following details: C Well stimulation or intervention vessel A well stimulation vessel or well intervention vessel is generally operating on the same location for a limited period of time.

Hull Girder Longitudinal Strength It is advised that provisions are made during model testing for suitable measurements to determine design pressures for local structural design. A Material classes A Design temperatures External structures above the lowest ballast waterline shall be designed for temperatures equal to the lowest daily mean temperature for the area s in which the unit is specified to operate.

B Alternative 2 – Hull girder dhv 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. 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 dvn 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.

Strip theory may be used provided: A component based stochastic analysis implies that non linear effects can be applied to the relevant load component. 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. The requirements given in Ch. Each mooring system configuration will impose loads on the hull structure.

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

The effect of vnv facilities shall be included in the hull girder assessment for these load conditions. The minimum required midship section modulus and moment of inertia may, in such cases, be reduced.


See Classification Note Location of Superstructure General Living quarters, lifeboats and other means of evacuation shall be located in non-hazardous areas and be protected and separated from production, storage, riser and flare areas.

Loads used in the global check shall be consistent. The different alternative design principles are given in Table B1.

It implies that all elements are accessible for inspection and repair. D Turret structure, bow recess and moonpool ox The following loads shall be considered for the fatigue design of turret structures: The most severe environmental loads may be applied for the complete lifetime of the unit, as a conservative approach. Typically, the assessment of the unit shall be based on the following operational modes: C Floating production, storage and offloading units A floating production storage and offloading unit can be relocated, but is generally located on the dhv location for a prolonged period of time.

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.

Alternatively the worst scatter diagram can be used 1c02 basis for calculation of fatigue life. Design Loads and Calculation of Stress Ranges Topside Facilities Structural Support E General The supporting structure is defined as oos area where the stress pattern in the structural elements is significantly affected by the topside loads.

Collision with supply boat and accidental flooding are thus not considered in this standard. Note that the Ms in the equations given above include the global effect of top side loads. Units intended to stay on dnc for prolonged periods shall also comply with the requirements dv in Appendix A. The expected dynamic load history shall be the basis for the calculations. Environmental Loads C General Definitions, general considerations and required methodology for determination of environmental loads are given in Ch.

Site specific environmental data shall be used for calculation of long term stress range distribution. The transverse strength shall comply with the requirements in Rules for Classification of Ships Pt.