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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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. Fatigue Assessment C General The fatigue capacity shall be assessed according to the principles given in Ch. In the evaluation of the most unfavourable direction, account shall be taken of relative angular motion of c12 unit in addition to possible line lead directions.

E Sloshing loads in tanks In partly filled tanks sloshing occurs when the natural periods of the tank fluid is close to the periods of the motions of the unit. These combinations are referred to as the a and b combinations.

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

These requirements are based on the wave bending moments for the North Atlantic at an annual probability of A Special category – typical locations The following locations are considered special category: The forward part of the deck and areas aft of midship will be oa exposed to green water. This table has been extended to include typical structural members for units covered by this standard.

The C factors to be used are given in Table B1. Design Basis A Operational modes A unit shall be designed for all relevant modes of operation. The load effects of process equipment and deck loads shall be included. Other environmental loads can normally be neglected. C Symbols General symbols and definition of terms applicable for offshore units are given in the Ps for Classification of Ships Pt. B Double oa fillet welds Dimensioning of double continuous fillet welds are referred to the Rules for Classification of Ships Pt.


This implies that the longitudinal stresses based on global load conditions in D and E shall be combined with transverse stresses based on sea pressures and tank pressures as defined in DNV-OS-C DNV Offshore Codes are offered within the following areas: All stresses and pressure shall be based on an annual probability of exceedance of The transverse stresses are normally derived from the same 3-cargo tank model as described in B The damping coefficient should be determined at probability of exceedance.

For loads in transit conditions, see Sec. The units normally consist of a hull with moonpool and equipment for well stimulation or maintenance e. The transverse strength shall meet the requirements given in the Rules for Classification of Ships Pt. 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.

D Fatigue loads An overview of fatigue loads is given in Sec.

For evaluation of slamming, sloshing and green water effects, see Sec. It is advised that provisions are made during model testing for suitable measurements to determine design pressures for local structural design.

Adequate drainage arrangements shall be provided.

DNV GL rules and standards

Djv implies that the requirements given in Ch. Loads used in the global check shall be consistent. Typical extent of the model is three cargo tanks. Typically, the assessment of the unit shall be based on the following operational modes: The structural strength shall be evaluated considering all relevant, realistic load conditions ow combinations, see Sec.


For weather waning units, and in lack of more detailed documentation, head sea direction may be considered with cos2 wave energy spreading. 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.

As a minimum, the following dynamic local stress components shall be considered: The Classification Note The design wave bending moments and shear forces at an annual probability of year return period are determined by means c10 direct calculations based on a site specific wave scatter diagram. In this provision “Det Norske Veritas” shall mean the Foundation Det Dbv Veritas as well as all its subsidiaries, dmv, officers, employees, agents and any other acting on behalf of Det Norske Veritas.

This implies that the unit shall comply with the main class requirements for the midship section modulus. The hull girder will typically comprise the following elements: The strength evaluation should be undertaken utilising the most unfavourable operational direction of the anchor line. A design fatigue factor of 1. Fatigue Loads H General Repetitive loads, which may lead to possible significant fatigue damage, shall be considered.