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Sec.1: Introduction [Table of Contents] B: References

DNV-OS-C201 Structural Design of Offshore Units (WSD method)

[-] Sec.1: Introduction
[-] A: General

Sec.1
A. General

Sec.1
A 100   Introduction

Sec.1 A
101   This offshore standard provides principles, technical requirements and guidance for the structural design of offshore structures, based on the Working Stress Design (WSD) method.

Sec.1 A
102   This standard has been written for general world-wide application. Statutory regulations may include requirements in excess of the provisions by this standard depending on size, type, location and intended service of the offshore unit or installation.

Sec.1 A
103   The standard is organised with general sections containing common requirements and sections containing specific requirement for different type of offshore units. In case of deviating requirements between general sections and the object specific sections, requirements of the object specific sections shall apply.

Sec.1
A 200   Objectives

Sec.1 A
201   The objectives of this standard are to:
—provide an internationally acceptable level of safety by defining minimum requirements for structures and structural components (in combination with referred standards, recommended practices, guidelines, etc.)
—serve as a contractual reference document between suppliers and purchasers
—serve as a guideline for designers, suppliers, purchasers and regulators
—specify procedures and requirements for offshore structures subject to DNV certification and classification.

Sec.1
A 300   Scope and application

Sec.1 A
301   This standard is applicable to the following types of offshore structures:
—column-stabilised units
—self-elevating units
—tension leg platforms
—deep draught floaters.


Sec.1 A
302   For utilisation of other materials, the general design principles given in this standard may be used together with relevant standards, codes or specifications covering the requirements to materials design and fabrication.

Sec.1 A
303   The standard is applicable to structural design of complete units including substructures, topside structures and vessel hulls.

Sec.1 A
304   This standard gives requirements for the following:
—design principles
—structural categorisation
—material selection and inspection principles
—loads and load effect analyses
—design of steel structures and connections
—special considerations for different types of units.

Requirements for foundation design are given in DNV-OS-C101.

Sec.1
A 400   Other than DNV codes

Sec.1 A
401   Other recognised codes or standards may be applied provided it is shown that the codes and standards, and their application, meet or exceed the level of safety of the actual DNV standard.

Sec.1 A
402   In case of conflict between requirements of this standard and a reference document other than DNV documents, the requirements of this standard shall prevail.

Sec.1 A
403   Where reference is made to codes other than DNV documents, the latest revision of the documents shall be applied, unless otherwise specified.

Sec.1 A
404   When code checks are performed according to other than DNV codes, the usage factors as given in the respective code shall be used.

Sec.1
A 500   Classification

Sec.1 A
501   Classification principles, procedures and applicable class notations related to classification services of offshore units are specified in the DNV Offshore Service Specifications given in Table A1.

Sec.1 A
Table A1 DNV Offshore Service Specifications 
Reference Title 
DNV-OSS-101 Rules for Classification of Offshore Drilling and Support Units  
DNV-OSS-102 Rules for Classification of Floating Production, Storage and Loading Units 
DNV-OSS-103 Rules for Classification of LNG/LPG Floating Production and Storage Units or Installations 
DNV-OSS-121 Classification Based on Performance Criteria Determined by Risk Assessment Methodology 
 Rules for Planning and Execution of Marine Operations 



Sec.1 A
502   Documentation for classification shall be in accordance with the NPS DocReq (DNV Nauticus Production System for documentation requirements) and DNV-RP-A201.

Sec.1: Introduction [Table of Contents] B: References