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Ch.1: Introduction [Table of Contents] Ch.2: Technical Provisions

DNV-OS-E304 Offshore Mooring Steel Wire Ropes

[-] Ch.1: Introduction
[-] Sec.1: General

Ch.1

SECTION 1
General

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 steel wire ropes, sockets and pins.

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 steel wire ropes, sockets and pins
—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 steel wire ropes, sockets and pins 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
—Chapter 3: Sections 1 to 4 giving specific procedures and requirements applicable for certification and classification 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 steel wire ropes, sockets and pins 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   This standard covers:
—stranded ropes and spiral ropes
—sockets and pins including socketing performance criteria and socketing procedures.

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 
EN 10016-4 Non-Alloy Steel Rod for Drawing and/or Cold Rolling.
Part 4: "Specific Requirements for Rod for Special Applications"  
DNV-OS-E301 Position Mooring 
DNV-OS-E302 Offshore Mooring Chain 
DNV-OS-F101 Submarine Pipeline Systems 
DNV-OS-B101 Metallic Materials 
DNV-OS-C401 Fabrication and Testing of Offshore Structures  
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  
API RP 2SK Recommended Practice for Design and Analysis of Station-keeping Systems for Floating Structures  
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 Practise for Castings, Carbon, Low-Alloy and Martensitic Stainless Steel, Ultrasonic Examination Thereof 
ISO 17893 Steel wire ropes - Vocabulary, designation and classification 
API Spec 9A /
ISO 10425  		Steel wire ropes for the petroleum and natural gas industries -
Minimum requirements and terms for acceptance 
ASTM A703 Steel Castings, General Requirements for Pressure - Containing Parts 
EN 10204:2004 Metallic Products - Types of Inspection Documents 
ISO 16120-4 Non alloyed steel wire rod for conversion to wire: Part 4 "Specific requirements for wire rod for special applications" 
EN 1179:1995 Zinc and zinc alloys - Primary zinc 
ASTM A586 Zinc Coated Parallel and Helical Structural Strand and Zinc Coated Wire for Spun-in-Place Structural Strand 
ASTM A856 Standard Specification for Zinc-5% Aluminium-Mischmetal Alloy-Coated Carbon Steel Wire 
ASTM A487M Specification for Steel Castings suitable for Pressure service 
ISO 3178 Steel wire ropes for general purposes - Terms of acceptance 
EN 10083-1 Steels for quenching and tempering - Part 1: General delivery conditions 
EN 10088-2 Stainless Steels -
Part 2: "Technical Delivery Conditions for Sheet/Plate and Strip of corrosion resistant steels for general purposes". 
ASTM D1248 Standard Specification for Polyethylene Plastics Moulding and Extrusion Materials 
ISO 4346 Steel wire ropes for general purposes - Lubricants - basic requirements 
EN 10264-3 Steel wire and wire products - Steel wire for ropes -
Part 3: "Round and shaped non alloyed wire for high duty applications". 
EN 10218 Steel Wire and Wire products - General: Part 1 "Test Methods"  
EN 10264-2  Steel wire and wire products - Steel wire for ropes -
Part 2: Cold drawn non alloyed steel wire for ropes for general applications 
ASTM A603 Standard Specification for Zinc-Coated Steel Structural Wire Rope 
ISO 2232 Round drawn wire for general purpose non-alloy steel wire ropes and for large diameter steel wire ropes -
Specifications 
ISO 3108 Steel wire rope for general purposes - determination of actual breaking load 
ISO 604 Plastics - Determination of compressive properties 
ISO 17558 Socketing procedures for wire ropes - resin socketing 
EN 59 Method of testing plastics 
EN 12385-10 Steel wire ropes - Safety - Part 10: "Spiral ropes for general structural applications" 

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 C
204   Mobile mooring: Anchoring at a specific location for a period less than 5 years.

Ch.1 Sec.1 C
205   Long term mooring: Mooring of a unit at the same location for more than 5 years.

Ch.1 Sec.1 C
206   Unit: is a general term for an offshore installation such as ship-shaped, column-stabilised, self-elevating, tension leg or deep draught floater.

Ch.1 Sec.1 C
207   Stranded rope: assembly of several strands laid helically in one (single-layer rope) or more (rotation-resistant or parallel-closed rope) layers around a core or centre e.g. 6 ´ 19, 6 ´ 36, 6 ´ 61.

Ch.1 Sec.1 C
208   Spiral rope: assembly of at least two layers of wires laid helically over a centre round wire, built-up strand or parallel-lay strand, with at least one layer of wires being laid in the opposite direction, i.e. contra-lay, to that of the outer layer(s) e.g. spiral strand, half locked coil, full locked coil.

Ch.1 Sec.1 C
209   Wire tensile strength grade: level of requirement of tensile strength of a wire and its corresponding range, designated by the value according to the lower limit of tensile strength and used when specifying wire and when determining the calculated minimum breaking load or calculated minimum aggregate breaking load of a rope.
Ch.1: Introduction [Table of Contents] Ch.2: Technical Provisions