os-c401_2013-04-4(1).pdf

(1835 KB) Pobierz
OFFSHORE STANDARD
DNV-OS-C401
Fabrication and Testing
of Offshore Structures
APRIL 2013
The electronic pdf version of this document found through http://www.dnv.com is the officially binding version
D
ET
N
ORSKE
V
ERITAS
AS
FOREWORD
DNV is a global provider of knowledge for managing risk. Today, safe and responsible business conduct is both a license
to operate and a competitive advantage. Our core competence is to identify, assess, and advise on risk management. From
our leading position in certification, classification, verification, and training, we develop and apply standards and best
practices. This helps our customers safely and responsibly improve their business performance. DNV is an independent
organisation with dedicated risk professionals in more than 100 countries, with the purpose of safeguarding life, property
and the environment.
DNV service documents consist of among others the following types of documents:
—
Service Specifications.
Procedural requirements.
—
Standards.
Technical requirements.
—
Recommended Practices.
Guidance.
The Standards and Recommended Practices 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
J) Cleaner Energy
O) Subsea Systems
U) Unconventional Oil & Gas
© Det Norske Veritas AS April 2013
Any comments may be sent by e-mail to
rules@dnv.com
This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document, and is believed to reflect the best of
contemporary technology. The use of this document by others than DNV is at the user's sole risk. DNV does not accept any liability or responsibility for loss or damages resulting from
any use of this document.
Offshore Standard DNV-OS-C401, April 2013
Changes – Page 3
CHANGES
General
This document supersedes DNV-OS-C401, October 2010.
Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve
a whole chapter, section or sub-section, normally only the title will be in red colour.
Main changes
• General
The whole document has been completely updated and renumbered.
Ch.2
Sec.1
Welding Procedures and Qualification of Welders
A clearer definition on methods to establish a WPS.
Validity of a WPS to be in line with Ship Rules Pt.2 Ch.3.
More detailed requirements regarding what groove dimensions that shall lead to a new welding procedure
qualification
— Introduction of ISO standards to be used in Fracture Mechanics testing
— Whole sub-section on Welding Procedure Qualification, Aluminium updated to be in line with Ship Rules
Pt.2 Ch.3.
— Introduction of Welding Procedure Qualification, Copper alloys.
•
—
—
—
Editorial Corrections
In addition to the above stated main changes, editorial corrections may have been made.
D
ET
N
ORSKE
V
ERITAS
AS
Offshore Standard DNV-OS-C401, April 2013
Contents – Page 4
CONTENTS
CH. 1 INTRODUCTION............................................................................................................... 7
SEC. 1 INTRODUCTION ............................................................................................................................. 8
1
General....................................................................................................................................................8
1.1
1.2
1.3
Introduction.............................................................................................................................................................. 8
Objective.................................................................................................................................................................. 8
Organisation of contents .......................................................................................................................................... 8
2
2.1
2.2
2.3
2.4
Normative References............................................................................................................................8
General..................................................................................................................................................................... 8
Offshore service specifications and rules ................................................................................................................ 8
Offshore Standards .................................................................................................................................................. 8
Other references....................................................................................................................................................... 9
3
3.1
Informative References .........................................................................................................................9
General..................................................................................................................................................................... 9
4
4.1
4.2
4.3
4.4
4.5
Definitions.............................................................................................................................................10
Verbal forms .......................................................................................................................................................... 10
Terms ..................................................................................................................................................................... 10
Abbreviations......................................................................................................................................................... 11
Latin symbols......................................................................................................................................................... 12
Greek symbols ....................................................................................................................................................... 12
CH. 2 TECHNICAL PROVISIONS........................................................................................... 14
SEC. 1 WELDING PROCEDURES AND QUALIFICATION OF WELDERS .................................. 15
1
Introduction..........................................................................................................................................15
1.1
1.2
1.3
General................................................................................................................................................................... 15
Wide gap welding ................................................................................................................................................. 15
Welding processes ................................................................................................................................................. 15
2
2.1
2.2
2.3
2.4
2.5
Welding Procedures.............................................................................................................................15
General................................................................................................................................................................... 15
Preliminary welding procedure specification ........................................................................................................ 16
Welding Procedure qualification test..................................................................................................................... 16
Welding procedure qualification record (WPQR) ................................................................................................. 16
Welding procedure specifications (WPS).............................................................................................................. 17
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
Welding Procedure Qualification, C-Mn Steel and Low Alloy Steel ..............................................17
Butt welds on plates............................................................................................................................................... 17
Butt welds in pipes................................................................................................................................................. 21
Full penetration T-, Y-, and K- joints .................................................................................................................... 22
Tubular joints/ Branch connections ....................................................................................................................... 23
Fillet welds............................................................................................................................................................. 24
Validity of a WPS.................................................................................................................................................. 25
Fracture mechanics (FM) testing .......................................................................................................................... 30
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Welding Procedure Qualification, Aluminium .................................................................................32
General................................................................................................................................................................... 32
Butt welds in plates................................................................................................................................................ 32
Butt welds in pipes................................................................................................................................................. 33
Branch connections................................................................................................................................................ 34
Fillet welds............................................................................................................................................................. 34
Non-destructive testing of test assemblies............................................................................................................. 34
Destructive testing ................................................................................................................................................. 34
Range of qualification............................................................................................................................................ 35
Retesting ................................................................................................................................................................ 37
5
5.1
5.2
5.3
Welding Procedure Qualification, Stainless Steel.............................................................................37
General................................................................................................................................................................... 37
Additional Requirements WPQT for Austenitic Stainless Steel ........................................................................... 37
Additional Requirements WPQT for Ferritic-Austenitic Stainless Steel (Duplex)............................................... 37
6
6.1
6.2
Welding Procedure Qualification, Copper Alloys ............................................................................38
Pipes, plates, castings and other product forms, not including propeller castings ................................................ 38
Copper Alloy Castings for Propellers.................................................................................................................... 38
7
7.1
7.2
Qualification of Welders......................................................................................................................40
General................................................................................................................................................................... 40
Standards for qualification testing ......................................................................................................................... 40
8
Testing...................................................................................................................................................40
D
ET
N
ORSKE
V
ERITAS
AS
Offshore Standard DNV-OS-C401, April 2013
Contents – Page 5
8.1
8.2
8.3
General................................................................................................................................................................... 40
Tensile testing at ambient temperature .................................................................................................................. 40
Bend testing ........................................................................................................................................................... 41
SEC. 2 FABRICATION AND TOLERANCES ........................................................................................ 43
1
General..................................................................................................................................................43
1.1
Objective and scope............................................................................................................................................... 43
2
2.1
2.2
Fabrication Planning ...........................................................................................................................43
General................................................................................................................................................................... 43
Quality system and workmanship.......................................................................................................................... 43
3
3.1
Inspection..............................................................................................................................................43
General................................................................................................................................................................... 43
4
4.1
4.2
Material Identification, Cutting and Forming ..................................................................................44
Material identification ........................................................................................................................................... 44
Cutting and forming............................................................................................................................................... 44
5
5.1
Tolerances.............................................................................................................................................45
Tolerances for alignment and straightness ........................................................................................................... 45
6
6.1
6.2
6.3
6.4
Assembly, Welding, Heat Treatment and Repairs ...........................................................................49
Assembly and welding........................................................................................................................................... 49
Post weld heat treatment (PWHT)......................................................................................................................... 52
Repairs ................................................................................................................................................................... 53
Flame straightening ............................................................................................................................................... 54
SEC. 3 NON-DESTRUCTIVE TESTING ................................................................................................. 55
1
General..................................................................................................................................................55
1.1
Scope...................................................................................................................................................................... 55
2
2.1
2.2
2.3
2.4
2.5
Non-Destructive Testing (NDT)..........................................................................................................55
General................................................................................................................................................................... 55
NDT procedures..................................................................................................................................................... 55
Personnel qualification .......................................................................................................................................... 55
Extent of NDT ....................................................................................................................................................... 56
Acceptance criteria for NDT ................................................................................................................................. 58
SEC. 4 OTHER TESTS ............................................................................................................................... 60
1
General..................................................................................................................................................60
1.1
Scope...................................................................................................................................................................... 60
2
2.1
Testing of Tightness .............................................................................................................................60
General................................................................................................................................................................... 60
3
3.1
Structural Tests....................................................................................................................................60
General................................................................................................................................................................... 60
SEC. 5 CORROSION PROTECTION SYSTEMS................................................................................... 62
1
General..................................................................................................................................................62
1.1
1.2
1.3
1.4
1.5
Scope...................................................................................................................................................................... 62
General................................................................................................................................................................... 62
Surface preparation and coating application ......................................................................................................... 62
Fabrication and installation of sacrificial anodes .................................................................................................. 62
Fabrication and installation of impressed current cathodic protection systems .................................................... 63
SEC. 6 MISCELLANEOUS........................................................................................................................ 64
1
General..................................................................................................................................................64
1.1
Scope...................................................................................................................................................................... 64
2
2.1
Bolts.......................................................................................................................................................64
Bolts and nuts ........................................................................................................................................................ 64
3
3.1
Mechanical Fastening ..........................................................................................................................64
Contact surfaces in slip resistant connections ....................................................................................................... 64
CH. 3 CERTIFICATION AND CLASSIFICATION ............................................................... 65
SEC. 1 GENERAL ....................................................................................................................................... 66
1
General Requirements.........................................................................................................................66
1.1
1.2
Introduction............................................................................................................................................................ 66
Assumptions .......................................................................................................................................................... 66
2
Specific Certification and Classification Requirements...................................................................66
D
ET
N
ORSKE
V
ERITAS
AS

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin