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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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.

C Green water The effect of green water on weather deck and on deckhouses shall be considered according to Ch. Design Loads for Minimum Structural Capacity A component based stochastic analysis implies that non linear effects can be applied to the relevant load component. The unit is normally equipped with dynamic positioning system with several thrusters.

With reference to Figure 1, the flare angle may normally be taken in accordance with: The transfer function for the dynamic pressure can be used to calculate local stress transfer functions. The transfer functions shall be combined in the cumulative damage calculations.

Examples of typical local structural capacity assessment are: Collision and Accidental Flooding D. The midship section moment of inertia about the transverse neutral axis is not to be less than: Loads used in the global check shall be consistent.

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. Corrosion Protection C Maintenance program A maintenance program shall be made taking into consideration that no dry-docking is planned for the unit.

The different alternative design principles are given in Table B1. Hull deformations shall be considered.

The Classification Note Environmental Loads E General Environmental loads are loads caused by environmental phenomena. C Floating production, storage and offloading units A floating production storage and offloading unit can be relocated, but is generally located on the same location for a prolonged period of time.


The transverse strength should be evaluated using a finite element model, and the effects of process equipment deck loads should be included. Particular attention should be given to the following details: Transverse Stresses C General Transverse stresses shall normally be determined based on a 3-D finite element analysis. No part of this publication may be reproduced or transmitted in any form or by any means, including photocopying and recording, without the prior written consent of Det Norske Veritas.


The expression for coefficient c2 in the Rules for Classification of Dn Pt. D Combination of stress components The following dynamic loads shall be included in a FLS analysis as relevant: Collision with supply boat and accidental flooding are thus not considered in this standard.

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

Other environmental loads can normally be neglected. C Sloshing loads in tanks B. Selection of Material A General Material specifications shall be established for all structural materials. Introduction A General requirements The structural response shall be determined by recognised analytical methods.

Examples of welds in this category are: Selection of Material A General A material specification shall be established for all structural materials. Such solutions are normally restricted to benign environments. The longitudinal and transverse stresses shall be based on consistent loads using actual internal and external pressures corresponding to the worst combination of still water loads and wave position. Three-dimensional effects in fore and aft ship will reduce the drag force compared to a strip theory approach.

Ps Special category – typical locations The following locations are considered special category: D Calculation of global dynamic stress ranges Global stress ranges shall be ox from ndv global hull bending stresses, axial stresses and torsional stresses.

DNV GL rules and standards

Introduction A General requirements The technical requirements for the welding and weld connections shall, as a minimum, comply with the Rules for Classification of Ships Pt. 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.



A Env water load conditions All relevant still water loading conditions shall be considered to determine the limit curves for maximum permissible bending moments and shear forces.

B Full penetration welds Full penetration welds are in any case to be used in the following connections: Definitions B Benign waters Benign c1002 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 C factors to be used are given in Table B1.

Individual environmental loads shall be based on an annual probability of exceedance equal to years return period for hull girder structural response calculations. This implies that the unit shall comply with the main class requirements for the midship section modulus. Fatigue Assessment C General The fatigue capacity shall be assessed according to the principles given in Ch. The alternative 1 implies that the global hull girder capacity complies with the main class requirements and alternative 2 implies that the assessment is based on direct calculations.

See Classification Note Strength Assessment Principles B General procedure Subsection B applies to units where the global hull capacity based on the main class requirements is sufficient North Atlantic at a probability of exceedance of corresponding to 20 years return period.

The effect of topside facilities shall be included in the hull girder assessment for these load conditions. Typical extent of the model is three cargo tanks.