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OFFSHORE STANDARD
DNV-OS-E301
POSITION MOORING
OCTOBER 2010
DET NORSKE VERITAS
FOREWORD
DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life,
property and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and
consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and
carries out research in relation to these functions.
DNV service documents consist of amongst other the following types of documents:
— Service Specifications. Procedual 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
The electronic pdf version of this document found through http://www.dnv.com is the officially binding version
© Det Norske Veritas
Any comments may be sent by e-mail to [email protected]
For subscription orders or information about subscription terms, please use [email protected]
Computer Typesetting (Adobe Frame Maker) by Det Norske Veritas
If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to
such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that
the maximum compensation shall never exceed USD 2 million.
In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf
of Det Norske Veritas.
Offshore Standard DNV-OS-E301, October 2010
Changes – Page 3
General
This document supersedes DNV-OS-E301, October 2008.
Main changes in October 2010:

Ch.2 Sec.1
— B306: Included a definition of extreme value for mooring line tensions during a squall event.
— B700: Adjusted the required drag coefficients for steel wire ropes.

Ch.2 Sec.2
— B101: Added fibre rope degradation method.
— B110 (previous item B106): updated guidance regarding e-modules of studless chain based on information
from VICINAY.
— E201: Updated Table E1 with respect to in-service assessment.
— F800: Requirements to investigate the possibility of VIM on steel wire and fibre ropes included. If VIM is
a possible load effect, the effect shall be included in fatigue assessment.

Ch.2 Sec.4
— Sub-section J, Added 103 and 200: design criteria for fibre ropes and yarn for fibre ropes.
— Q105: Added requirement to measuring ranges for tension measuring equipment.
— R403: Added design requirement to element between MLBE and mooring line.

Ch.2 Sec.5
— A100: Added requirements for anchor shackles for mobile mooring that are not of R-quality.

Ch.3 Sec.1
— B100: Added that temporary mooring is not a class requirement for DP units with DYNPOS-AUTR or
AUTRO notations. Towing arrangements for ship shaped units shall be according to DNV Rules for
Classification of Ships.
— D602: It is emphasized that it is the technical part of the standard that could be replaced by e.g. API RP2SK
and ISO 19901-7, and that equipment and material shall be certified by DNV.

Ch.3 Sec.2
— A200: Chain qualities R4S and R5 are included in the standard.
— G200: Requirements added regarding in-service condition assessment for fibre ropes.
DET NORSKE VERITAS
Offshore Standard DNV-OS-E301, October 2010
Page 4 – Contents
CONTENTS
CH. 1 INTRODUCTION .............................................................................................................................. 9
Sec. 1
A.
A
A
A
General .............................................................................................................................................. 10
General .......................................................................................................................................................................... 10
100 Introduction......................................................................................................................................................... 10
200 Objectives ........................................................................................................................................................... 10
300 Scope and application ......................................................................................................................................... 10
B. Normative References................................................................................................................................................... 10
B 100 General................................................................................................................................................................ 10
C. Informative References ................................................................................................................................................. 11
C 100 General................................................................................................................................................................ 11
D. Definitions..................................................................................................................................................................... 11
D 100 Verbal forms ....................................................................................................................................................... 11
D 200 Terms .................................................................................................................................................................. 12
E. Abbreviations and Symbols .......................................................................................................................................... 13
E 100 Abbreviations...................................................................................................................................................... 13
E 200 Symbols .............................................................................................................................................................. 13
F. Documentation .............................................................................................................................................................. 16
F 100 General................................................................................................................................................................ 16
CH. 2 TECHNICAL PROVISIONS.......................................................................................................... 17
Sec. 1