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 following matters should be taken into consideration to be able to carry out condition monitoring on location: Each of such elements should be considered separately subjected to the shear force in the element.

In particular load combinations due to the following shall be accounted for in the design: The turret may be of significant size and will affect the distribution of hull girder bending stresses — units designed with a submerged disconnectable turret buoy normally located in the foreship or bow region — units designed with spread mooring system, or similar solutions.

Fore and Aft Ship 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.

A Objectives The objectives of this standard are to: F General Collision with a typical supply boat is normally not affecting the structural integrity as long as the unit comply with stability requirements from national or international bodies.

D Turret structure, bow recess and moonpool area The following loads shall be considered for the fatigue design of turret structures: Three-dimensional effects in fore and aft ship will reduce the drag force compared to a strip theory approach. Short wave periods are normally the most critical. 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.


DNV GL rules and standards

Table B1 Weld factor C Item Local buckling stiffeners Stiffeners, frames, beams or longitudinals to shell, deck, oil tight or water tight girders or bulkhead plating, except in after peaksSecondary stiffeners in turret Web plates of non-watertight girders except in after peak Girder webs and floors in double bottomStiffeners and girders in after peaksMain girder system and decks in turretHorizontal stringers on transverse bulkheads Watertight centre line girder to bottom and inner bottom platingBoundary connection of ballast and liquid cargo bulkhead: Transverse Structural Strength C General Transverse strength refers the strength of main transverse members such as transverse bulkheads and web frames.

A Special category – typical locations The following locations are considered special category: The non-linear correction factors for unconventional hull forms shall be documented by direct calculations. Collision and Accidental Flooding The midship section moment of inertia about the transverse neutral axis is not to be less than: The units normally consist of a hull, with turret, and production equipment on the deck.

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.

Collision with supply boat and accidental flooding are thus not considered in this standard.


The unit follows the normal class survey program. A design fatigue factor of 1.

The effect of mean stresses should normally be ignored. A Still water load conditions All relevant still water loading conditions shall be considered to determine od limit curves for maximum permissible bending moments and shear forces.

Such loads may comprise the following: Fore and Aft Ship E. The expected dynamic load history shall be the basis for the calculations. D Topside structures The following loads shall be considered for the topside structure: The forward part of the deck and areas aft of midship will be particularly exposed to green water. The changes are incorporated in the Web, CD and printable pdf versions. Factors governing the occurrence of sloshing are: General Application and Assumptions 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.

Location of Superstructure General C012 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.

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

Selection of Material A General Material specifications shall be established for all structural materials. C Wave induced loads If the structural assessment is based on direct calculated wave loads, bending moments, shear forces and accelerations, the wave loads shall be determined according to Ch. Fatigue Loads H General Repetitive loads, which may lead to possible significant fatigue damage, shall be considered.