DNV-OS-C401 ”Fabrication and Testing of Offshore Structures”,Jon R.Hansen 2007.04.16,Version,Slide 2,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Arne Smedal, Director Sevan and Ni Tao, General Manager Cosco Nantong Shipyard signing the contract.,Version,Slide 3,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Starting left Norwegian Consul(Shanghai) Fred H. Nomme, Arne Smedal and Cosco Shipyard Group President Wang Xing Ru.,Version,Slide 4,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,This is whats all about,Version,Slide 5,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Course Purpose. To give a brief overview of DNV offshore standards. To give basic knowledge of fabrication standard OS C-401,Version,Slide 6,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,DNVs ROLE IN OFFSHORE CLASSIFICATIONDET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, property and the environment, at sea and onshore. 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.,Version,Slide 7,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,DNV Offshore Codes consist of a three level hierarchy of documents:,Service Specifications,Offshore Standards,RecommendedPractices,Design,Construction,Operation,Internationally recognised codes,Version,Slide 8,23 September 2018,Service Specifications,Classification,Safety, Health & Environment,DNV-OS-C401”Fabrication and Testing of Offshore Structures”,Qualification& Innovation,Verification & Classification,Asset Operation,Shelf State Compliance,Verification,Version,Slide 9,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and consultancy services.,Version,Slide 10,23 September 2018,Offshore Standards,DNV-OS-C401”Fabrication and Testing of Offshore Structures”,A: Quality and Safety Methodology,B: Materials Technology,C: Structures,D: Systems,E: Special Facilities,F: Pipelines and Risers,A,B,C,D,E,F,Version,Slide 11,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as the technical basis for DNV offshore services.,Version,Slide 12,23 September 2018,Recommended Practices,A: Quality and Safety Methodology,B: Materials Technology,C: Structures,D: Systems,E: Special Facilities,F: Pipelines and Risers,A,B,C,D,E,F,G,G: Asset Operation,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Version,Slide 13,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards.,Version,Slide 14,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures,DNV Offshore Codes are offered within the following areas:A) Qualification, Quality and Safety Methodology B) Materials Technology C) Structures D) Systems E) Special Facilities F) Pipelines and Risers G) Asset Operation H) Marine Operations,Version,Slide 15,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures”,Difference Ship Rules versus Offshore rulesRules for Offshore projects are in some areas quite different from the traditional Ship Rules, due to long time on location with no or limited possibilities leave the location. ( 20 25 years service time),Version,Slide 16,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures”,Some important aspects: Structural integrity and strength (Loads based on environmental conditions on actual location) Accidental loads to be included in Design Loads (DAL) Fatigue (attention to details) Maintenance Corrosion protection In service inspection ( Access etc. should be planned and provided during newbuilding phase) Increased reliability of Marine systems, utility systems and equipment. Safety systems (Fire, explosion, abandon installation etc.) Shelf state requirements to accommodation and working environment,Version,Slide 17,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures”,DNV-OS-C401”Fabrication and Testing of Offshore Structures”CH. 1 INTRODUCTION CH. 2 TECHNICAL PROVISIONSCH. 3 CERTIFICATION AND CLASSIFICATION,Version,Slide 18,23 September 2018,DNV-OS-C401”Fabrication and Testing of Offshore Structures”,CH. 1 INTRODUCTION A 200 Objective 201 The objectives of this standard are to: Provide an internationally acceptable standard to ensure the quality of all welding operations used in offshore fabrication, through identifying appropriate welding procedures, welder qualifications and test methods. Serve as a technical reference document in contractual matters between purchaser and contractor. Serve as guideline for designer, purchaser and contractor Specify minimum requirements for welding operations subject to DNV certification and classification.,