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

DNV-OS-C502 Offshore Concrete Structures

[-] 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 guidelines for the design, construction and in service inspection of Offshore Concrete Structures. The Concrete Structures may be a floating or gravity based structure.

Sec.1 A
102   This standard shall be used together with the general offshore design standards for steel structures DNV-OS-C101, DNV-OS-C102, DNV-OS-C103, DNV-OS-C105 and DNV-OS-C106. These standards cover a wide range of different structures

Sec.1 A
103   The standard covers design, fabrication/construction, installation and inspection of offshore concrete structures.

Sec.1 A
104   Design, construction, inspection and maintenance of Offshore Concrete LNG Terminals are covered by DNV-OS-C503.

Sec.1 A
105   For design and construction of offshore concrete wind turbines, reference is made to DNV-OS-J101 "Design of Offshore Wind Turbines Structures".

Sec.1 A
106   This standard cover design of platforms/structures for oil production, oil storage, harbours and deep water foundation of bridges where reinforced and prestressed concrete is used as structural material.

For structures like deep water foundation of bridges and harbours special considerations will be required on load specifications.

Sec.1
A 200   Objective

Sec.1 A
201   The objectives of this standard are to:
—provide an international standard for the design, construction and in-service inspection of Offshore Concrete Structures with an acceptable level of safety by defining minimum requirements for design, construction control and in-service inspection
—serve as a contractual reference document between supplier and purchasers related to design, construction and in-service inspection
—serve as a guideline for designer, supplier, purchasers and regulators.

Sec.1
A 300   Scope and applications

Sec.1 A
301   The standard is applicable to Design, Construction, Inspection and Maintenance of Offshore Concrete Structures, using concrete as the structural material in the support structure as defined in 302 below.

Sec.1 A
302   The standard can be used in the structural design of the following types of support structures:
—GBS (Gravity Based Structures) offshore concrete structures for oil/gas production
—GBS structures for oil/gas production with oil storage facility
—Floating concrete structures for production of oil/gas. The structure may be of any type floating structure, i.e. Tension leg platform (TLP), Column stabilised units and Barge type units
—Concrete harbours
—Artificial concrete export/import harbours, either floating or fixed and with storage facilities, allowing transport of articles and goods with small boats to the artificial harbour for reloading on large sea going vessels. Cargo may be different types or ore or oil/gas
—Deep water caisson type concrete foundation of bridges
—Floating foundations for bridges, parking houses or storage buildings.


Sec.1 A
303   Appendices A to F are appended to the standard. These appendices contain guidelines for the design of Offshore Concrete Structures.

Sec.1 A
304   Floating Offshore Concrete structures shall be designed with freeboard and intact stability in accordance with DNV-OS-C301. For temporary phases the stability shall be in accordance with DNV Rules for Planning and Execution of Marine Operations.

Sec.1 A
305   The development and design of new concepts for Offshore Concrete Structures requires a systematic hazard identification process in order to mitigate the risk to an acceptable risk level. Hazard identification is therefore a central tool in this standard in order to identify hazards and mitigate these to an acceptable risk level.

Sec.1
A 400   Non DNV codes and standards

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

Sec.1 A
402   The provision for using non-DNV codes or standards is that the same safety level as provided by this DNV standard, is obtained.

Sec.1 A
403   Where reference is made to non - DNV codes, the valid revision shall be taken as the revision which is current at the date of issue of this standard, unless otherwise noted.

Sec.1 A
404   In addition to the requirements mentioned in this standard, it is also the responsibility of the designer, owner and operator to comply with additional requirements that may be imposed by the flag state or the coastal state or any other jurisdictions in the intended area of deployment and operation.

Sec.1
A 500   Classification

Sec.1 A
501   Classification principles, procedures and application 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 and Storage 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 

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