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DNV-OS-E302 Offshore Mooring Chain [Table of Contents] Ch.2: Technical Provisions

DNV-OS-E302 Offshore Mooring Chain

[-] 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 contains criteria, technical requirements and guidance on materials, design, manufacture and testing of offshore mooring chain and accessories.

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 the offshore unit or installation.

Ch.1 Sec.1 A
103   The objectives of this standard are to:
—provide an internationally acceptable standard of safety by defining minimum requirements for offshore mooring chain and accessories
—serve as a contractual reference document between manufacturers and purchasers
—serve as a guideline for designers, suppliers, purchasers and regulators
—specify procedures and requirements for offshore mooring chain and accessories subject to DNV certification and classification.


Ch.1 Sec.1 A
104   This standard is divided into three main chapters:
—Chapter 1: Section 1 with general information, scope, definitions and references
—Chapter 2: Sections 1 and 2 with technical provisions for materials and chain cables
—Chapter 3: Section 1, Appendix A and B giving specific procedures and requirements applicable for certification and classification of materials and chain cables in accordance with this standard. Also, requirements to design verification are given.

Ch.1 Sec.1
A 200   Scope and application

Ch.1 Sec.1 A
201   The mooring chain and accessories specified herein are intended for position mooring applications such as: mooring of mobile offshore units, mooring of floating production units, mooring of offshore loading systems, and mooring of gravity base structures during fabrication.

Ch.1 Sec.1 A
202   Mooring chain links covered are common stud links and common stud less links, connecting common links (splice links), enlarged links and end links.

Ch.1 Sec.1 A
203   Mooring chain accessories covered are detachable connecting links (shackles), connecting plates (triplates etc), end (anchor) shackles, swivels and swivel shackles.

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 E112 Test Methods for Determining Average Grain Size 
ASTM E381 Method of Macro-etch Testing Steel Bars, Billets, Blooms and Forgings 
ISO 4967 Steel - Determination of content of non-metallic inclusions - Micrographic method using standard diagrams 
ASTM A255 Standard Test Methods for Determining Hardenability of Steel 
DNV-OS-B101 Metallic materials 
ISO 9712  Non-destructive testing ? Qualification and certification of personnel  
EN 473  Non destructive testing - Qualification and certification of NDT personnel - General principles 
SNT-TC-1A (ASNT) Personnel Qualification and Certification in Non-destructive Testing 
EN 10228-1/3 Non-destructive testing of steel forgings  
ASTM A275  Standard Practice for Magnetic Particle Examination of Steel Forgings  
ASTM A388  Standard Practice for Ultrasonic Examination of Heavy Steel Forgings  
ASTM E709  Standard Guide for Magnetic Particle Examination  
ASTM A609 Standard Practice for Castings, Carbon, Low-Alloy and Martensitic Stainless Steel, Ultrasonic Examination Thereof 
ISO 1704 Ships and marine technology - Stud-link anchor chains 
API Spec 2F Specification for mooring chain 
ASTM E587 Practice for Ultrasonic Angle-Beam Examination by the Contact Method 
ASME IX Welding and Brazing Qualifications  
EN 287  Approval testing of welders - Fusion welding 
EN 288 Specification and approval of welding procedures for metallic materials 
ISO 9606  Approval testing of welders - Fusion welding  
ASTM A488 Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel 

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.
DNV-OS-E302 Offshore Mooring Chain [Table of Contents] Ch.2: Technical Provisions