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The electronic pdf versions of the documents found through http://www.dnv.com/ are the officially binding versions. Copyright Det Norske Veritas.
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DNV-OS-C401 Fabrication and Testing of Offshore Structures |
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| Ch.1: Introduction |
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| Sec.1: Introduction |
Ch.1
| — | provide an internationally acceptable
standard to ensure the quality of:
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| — | 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. |
Ch.1 Sec.1 B
| Table B1 DNV Offshore Service Specifications and rules | |||||||
| 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 | Rules for Classification of Ships | |
Ch.1 Sec.1 B
| Table B2 DNV Offshore Standards | |||||||
| Reference | Title | DNV-OS-B101 | Metallic Materials | DNV-OS-C101 | Design of Offshore Steel Structures, General
(LRFD method) | DNV-OS-C201 | Structural Design of Offshore Units (WSD method) | |
Ch.1 Sec.1 B
| Table B3 Other references | |||||||||||||||||||||||||||||||||||||||
| Reference | Title | ANSI/AWS D1.1 | Structural Welding Code - Steel | ASME | Section IX, Welding and Brazing Qualifications
Non-Interfiled (Boiler and Pressure Vessel Codes) | ASTM G48 | Standard Test Methods for Pitting and Crevice
Corrosion Resistance of Stainless Steels and Related Alloys by Use
of Ferric Chloride Solution | ASTM E562 | Standard Test Method for Determining Volume
Fraction by Systematic Manual Point Count | BS 7448-2 | Fracture mechanics toughness tests. Method
for determination of KIc, critical CTOD and critical J values of
welds in metallic materials | EN 287 | Approval testing of welders - Fusion welding | EN 1418 | Welding personnel - Approval testing
of welding operators for fusion welding and resistance weld setters
for fully mechanized and automatic welding of metallic materials | IACS | Guideline No. 47 Shipbuilding and Repair Quality Standard, Part
A - Shipbuilding and repair Quality Standard for New Construction
and Part B - Repair Quality Standard for Existing Ships | ISO 148 | Steel - Charpy impact test (V-notch) | ISO 898 | Mechanical properties of fasteners made of
carbon and alloy steel | ISO 5817 | Welding - Fusion-welded joints in steel, nickel,
titanium and their alloys (beam welding excluded) - Quality levels
for imperfections | ISO 6507-1 | Metallic materials - Vickers hardness test
- Part 1: Test method | ISO 8501-1 | Preparation of steel substrates before application
of paints and related products -- Visual assessment of surface cleanliness
- Part 1: Rust grades and preparation grades of uncoated steel substrates
and of steel substrates after overall removal of previous coatings | ISO 9001:2000 | Quality management systems - Requirements | ISO 9606 | Approval testing of welders - Fusion welding | ISO 10042 | Arc-welded joints in aluminium and its weldable
alloys - Guidance on quality levels for imperfections | NACE MR0175 | Sulphide Stress Cracking Resistant Metallic
Materials for Oil field Equipment - Item No. 21302 | EN 473 | Qualification and certification of NDE personnel | ISO 9712 | Non-destructive testing - Qualification and
certification of personnel | |
Ch.1 Sec.1 C
| Table C1 DNV Recommended Practices and Classification Notes | |||||||||
| Reference | Title | DNV-RP-C203 | Fatigue Strength Analysis of Offshore Steel
Structures | DNV Classification Note 30.1 | Buckling Strength Analysis | DNV Classification Note No. 7 | Non-Destructive Testing | Standard for Certification | No. 2.9 Approval Programme No. 402B Firms engaged in non destructive testing (NDT)
on offshore projects and offshore units/components | |
Ch.1 Sec.1 D
| Table D1 Abbreviations | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Abbreviation | In full | AC | Alternating current | ANSI | American National Standards Institute | ASME | American Society of Mechanical Engineers | ASTM | American Society for Testing of Materials | AWS | American Welding Society | BM | Base material | BS | British Standard (issued by British Standard
Institution) | CE | Carbon equivalent | C-Mn | Carbon manganese | CTOD | Crack tip opening displacement | DAC | Distance amplitude curve | DC | Direct current | DNV | Det Norske Veritas | ECA | Engineering critical assessment | EN | European de Normalisation | FM | Fracture mechanics | HAZ | Heat affected zone | IACS | International Association of Classification
Societies | ISO | International Organisation for Standardisation | MAG | Metal active gas (welding) | MIG | Metal inert gas (welding) | NACE | National Association of Corrosion Engineers | NDT | Non-destructive testing | PWHT | Post weld heat treatment | RP | Recommended practice | SMAW | Shielded metal arc welding | SMYS | Specified minimum yield stress | TIG | Tungsten inert gas (welding) | WM | Weld metal or Deposit | |
| a | = | size of test specimen |
| b | = | size of test specimen |
| d | = | diameter of round tensile test specimen |
| df | = | distance from the plane of the fatigue pre-crack to the fusion line |
| e | = | plastic deformation |
| hT | = | test pressure height |
| hop1 | = | vertical distance from the load point to the position of maximum filling height |
| hs3 | = | vertical distance from the load point to the top of the tank |
| hp0 | = | height corresponding to valve opening pressure when exceeding the general value |
| hop2 | = | vertical distance from the load point to the position of maximum filling height. For tanks adjacent to the sea that are situated below the extreme operational draught (TE), hop2 is not normally to be taken as being less than TE |
| hD2 | = | pressure head due to flow through pipes |
| le | = | equivalent parameter for conical shells |
| lmin | = | breadth of test assembly plates |
| lr | = | length of template or rod |
| r | = | nominal radius of the shell |
| ra | = | actual distance from the centre of the sphere to the shell wall |
| re | = | equivalent parameter for conical shells |
| ra | = | actual distance from the cylinder axis to the shell wall |
| s | = | distance between stiffeners or girders |
| t | = | thickness |
| t1 | = | wall thickness of the greater tube (can) |
| t2 | = | wall thickness of the smaller tube (brace) |
| A | = | diameter used in wrap around bending test |
| C | = | diameter of roller in bend test |
| D | = | outside diameter |
| D1 | = | outside diameter of the greater tube (can) |
| D2 | = | outside diameter of the smaller tube (brace) |
| KV | = | impact energy requirement |
| Lo | = | length of test area in test specimens |
| Lmin | = | length of test assembly plates |
| N | = | number of |
| R | = | radius |
| Rc | = | forming radius |
| T | = | thickness of plate in bend test |
| W | = | width of weld |
| a | = | tubular joint angle |
| d | = | measure of deformation compared to theoretical geometry |
| li | = | length of area with acceptable location of the fatigue pre-crack |
| n | = | Poisson's ratio |
| s1 | = | largest compressive principal membrane stress |
| s2 | = | principal membrane stress normal to s1 |
| y | = | ratio between principal stresses. |
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