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DNV-OS-B101 Metallic Materials [Table of Contents] Ch.2: Technical Provisions

DNV-OS-B101 Metallic Materials

[-] Ch.1: Introduction

CHAPTER 1

Introduction

Ch.1

SECTION 1
Introduction

Ch.1 Sec.1
A. General

Ch.1 Sec.1
A 100   Introduction

Ch.1 Sec.1 A
101   This offshore standard provides principles, technical requirements and guidance for metallic materials to be used in the fabrication of offshore structures and equipment within main class.

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

Ch.1 Sec.1 A
103   The objectives of this standard are to:
—provide an internationally acceptable standard for quality of metallic materials used for offshore construction and fabrication, by defining minimum requirements for material specifications, treatment processes and testing
—serve as a contractual reference document between manufacturers, suppliers and purchasers
—serve as guideline for designers, manufacturers, suppliers, purchasers and regulators
—specify procedures and requirements to metallic materials to be used in offshore structures and facilities subject to DNV certification and classification.

Ch.1 Sec.1
A 200   Scope and application

Ch.1 Sec.1 A
201   The requirements are applicable to:
—rolled steel for structural applications
—steel tubes and pipes
—forgings and castings
—wrought aluminium alloys.

Requirements for copper alloys and iron castings are given in Rules for Classification of Ships, Pt.2 Ch.2.

Ch.1 Sec.1 A
202   Materials, manufacturing methods and procedures complying with proprietary specifications or recognised practises may be accepted provided such documents give reasonable equivalence to the requirements of this standard.

Ch.1 Sec.1
A 300   Material specification

Ch.1 Sec.1 A
301   A material specification shall be prepared referring to the relevant section of this standard and stating possible additional requirements and/or modifications to materials, manufacture and testing.

Ch.1 Sec.1 A
302   The specified properties shall be consistent with the specific application and operational requirements of the structure or equipment. Suitable allowances shall be included for possible degradation of the mechanical properties resulting from subsequent fabrication and installation activities.

Ch.1 Sec.1 A
303   The specification should include specific requirements in places where this standard gives options, e.g. chemical composition, testing, requirements subject to agreement, etc.

Ch.1 Sec.1
A 400   Pre-qualification of materials and manufacturers

Ch.1 Sec.1 A
401   Pre-qualification of materials based on loads, temperatures and service conditions, shall be considered in order to verify that the materials will fulfil functional requirements.

Ch.1 Sec.1 A
402   Requirements for the pre-qualification of manufacturers shall be considered in each case. The consideration shall take into account the complexity and criticality of the product to be supplied, manufacturer's previous experience and the requirements of this standard.

Ch.1 Sec.1
A 500   Marking

Ch.1 Sec.1 A
501   All marking shall be easily identifiable and in such a condition that it is legible during the subsequent activities.

Ch.1 Sec.1 A
502   The type of marking shall be subject to agreement.

Ch.1 Sec.1 A
503   Each product shall be marked with a unique number. The marking shall reflect the correlation between the product and the respective inspection document.

Ch.1 Sec.1
A 600   Certification

Ch.1 Sec.1 A
601   Materials and products shall be delivered with inspection documents as defined in EN 10204 or agreed equivalent. The level of documentation i.e. test report, type of inspection certificate, etc. will depend on the application and shall be subject to agreement in each case.

Ch.1 Sec.1
B. Normative References

Ch.1 Sec.1
B 100   General

Ch.1 Sec.1 B
101   The standards in Table B1 include provisions which, through reference in this text, constitute provisions of this offshore standard. Latest issue of the standards shall be used unless otherwise agreed.

Ch.1 Sec.1 B
102   Other recognised standards may be used provided it can be demonstrated that these meet or exceed the requirements of the standards in Table B1.

Ch.1 Sec.1 B
103   Any deviations, exceptions and modifications to the design codes and standards shall be documented and agreed between the supplier, purchaser and verifier, as applicable.

Ch.1 Sec.1
B 200   Reference documents

Ch.1 Sec.1 B
201   Applicable reference documents are given in Table B1.

Ch.1 Sec.1 B
Table B1 Normative references 
No. Title 
ASTM A 275 Standard Test Method for Magnetic Particle Examination of Steel Forgings  
ASTM A 388 Standard Practice for Ultrasonic Examination
of Heavy Steel Forgings  
ASTM E 165 Standard Test Method for Liquid Penetrant
Examination  
ASTM E 709 Standard Guide for Magnetic Particle
Examination  
ISO 3452 Non-destructive Testing - Penetrant inspection/testing 
ISO 9712 Non-destructive Testing - Qualification
and certification of personnel  
EN 10204 Metallic Products - Types of inspection
documents  
EN 473 Qualification and Certification
of NDT personnel 
EN 10160 Ultrasonic Testing of Steel Flat Product
of Thickness Equal or Greater than 6 mm
(reflection method) 
EN 10228-1/2/3/4 Non-destructive Testing of Steel Forgings  
DNV OS-D101  Marine and Machinery Systems and Equipment 

Ch.1 Sec.1
C. Definitions

Ch.1 Sec.1
C 100   Verbal forms

Ch.1 Sec.1 C
101   Shall: Indicates requirements strictly to be followed in order to conform to this standard and from which no deviation is permitted.

Ch.1 Sec.1 C
102   Should: Indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required. Other possibilities may be applied subject to agreement

Ch.1 Sec.1 C
103   May: Verbal form used to indicate a course of action permissible within the limits of the standard.

Ch.1 Sec.1 C
104   Agreement, agreed or by agreement: Unless otherwise indicated, agreed in writing between manufacturer and purchaser.

Ch.1 Sec.1
C 200   Terms

Ch.1 Sec.1 C
201   Purchaser: The owner or another party acting on his behalf, who is responsible for procuring materials, components or services intended for the design, fabrication or modification of a unit or installation.

Ch.1 Sec.1 C
202   Manufacturer: The party who is contracted to be responsible for planning, execution and documentation of manufacturing.

Ch.1 Sec.1 C
203   Non-destructive testing (NDT): Visual inspection, radiographic testing, ultrasonic testing, magnetic particle testing, penetrant testing and other non-destructive methods for revealing defects and irregularities.

Ch.1 Sec.1
D. Abbreviations and Symbols

Ch.1 Sec.1
D 100   Abbreviations

Ch.1 Sec.1 D
101   Abbreviations used are given in Table D1.

Ch.1 Sec.1 D
Table D1 Abbreviations 
Abbreviation Full text 
AR As rolled 
EHS Extra high strength steel 
EN European Norm 
HS High strength steel  
IMO International Maritime Organization 
N Normalised 
NR Normalising rolling 
NS Normal strength steel 
QT Quenched and tempered 
TM Thermo-Mechanical rolling 

Ch.1 Sec.1
D 200   Symbols

Ch.1 Sec.1 D
201   Symbols used are given in Table D2.

Ch.1 Sec.1 D
Table D2 Symbols 
Symbol Definition 
NV Designation of a steel grade according to DNV offshore standards 
X A capital letter corresponding to a specified impact toughness test temperature 
Y A figure designating the strength group according to the specified minimum yield stress 
W Letter included to designate a steel grade of improved weldability 
Z Steel grade of improved through-thickness properties 
S Specially accepted steel 
Rm Tensile strength 
Re Yield stress (yield point) 
Rp Yield strength (proof stress) 
Rt Yield strength (proof stress), total elongation 

DNV-OS-B101 Metallic Materials [Table of Contents] Ch.2: Technical Provisions