SIST EN ISO 19901-7:2006

SLOVENSKI STANDARD
SIST EN ISO 19901-7:2006
01-september-2006
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Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
(ISO 19901-7:2005)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen an Offshore-Bauwerke - Teil 7:
Betriebssysteme für die Stationsunterhalte schwimmender Anlagen und mobiler Offshore
-Einheiten (ISO 19901-7:2005)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 7: Systemes de maintien en position des structures en mer flottantes et
des unités mobiles en mer (ISO 19901-7:2005)
Ta slovenski standard je istoveten z: EN ISO 19901-7:2005
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
SIST EN ISO 19901-7:2006 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 19901-7:2006

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SIST EN ISO 19901-7:2006
EUROPEAN STANDARD
EN ISO 19901-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2005
ICS 75.180.10

English Version
Petroleum and natural gas industries - Specific requirements for
offshore structures - Part 7: Stationkeeping systems for floating
offshore structures and mobile offshore units (ISO 19901-
7:2005)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Spezielle Anforderungen an
spécifiques relatives aux structures en mer - Partie 7: Offshore-Bauwerke - Teil 7: Betriebssysteme für die
Systèmes de maintien en position des structures en mer Stationsunterhalte schwimmender Anlagen und mobiler
flottantes et des unités mobiles en mer (ISO 19901-7:2005) Offshore-Einheiten (ISO 19901-7:2005)
This European Standard was approved by CEN on 14 November 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-7:2005: E
worldwide for CEN national Members.

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SIST EN ISO 19901-7:2006

EN ISO 19901-7:2005 (E)





Foreword


This document (EN ISO 19901-7:2005) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 "Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries", the secretariat of which is
held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by June 2006, and conflicting national
standards shall be withdrawn at the latest by June 2006.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 19901-7:2005 has been approved by CEN as EN ISO 19901-7:2005 without any
modifications.

2

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SIST EN ISO 19901-7:2006

INTERNATIONAL ISO
STANDARD 19901-7
First edition
2005-12-01


Petroleum and natural gas industries —
Specific requirements for offshore
structures —
Part 7:
Stationkeeping systems for floating
offshore structures and mobile offshore
units
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 7: Systèmes de maintien en position des structures en mer
flottantes et des unités mobiles en mer





Reference number
ISO 19901-7:2005(E)
©
ISO 2005

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SIST EN ISO 19901-7:2006
ISO 19901-7:2005(E)
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©  ISO 2005
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ii © ISO 2005 – All rights reserved

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SIST EN ISO 19901-7:2006
ISO 19901-7:2005(E)
Contents Page
Foreword. vi
Introduction . viii
1 Scope. 1
2 Normative references. 2
3 Terms and definitions. 2
4 Symbols and abbreviated terms . 7
4.1 Symbols. 7
4.2 Abbreviated terms. 8
5 Overall considerations. 9
5.1 Functional requirements. 9
5.2 Safety requirements. 9
5.3 Planning requirements. 10
5.4 Inspection and maintenance requirements .10
5.5 Analytical tools. 10
6 Design requirements . 10
6.1 Exposure levels. 10
6.2 Limit states . 11
6.3 Defining design situations. 11
6.4 Design situations. 12
7 Actions. 14
7.1 General. 14
7.2 Site-specific data requirements . 14
7.3 Environmental actions on mooring lines . 15
7.4 Indirect actions . 16
7.4.1 General. 16
8 Mooring analysis. 18
8.1 Basic considerations. 18
8.2 Floating structure offset. 19
8.3 Floating structure response . 20
8.4 Mooring line response. 22
8.5 Line tension. 23
8.6 Line length and geometry constraints. 24
8.7 Anchor forces. 24
8.8 Typical mooring configuration analysis and assessment. 24
8.9 Thruster-assisted moorings. 25
8.10 Transient analysis of floating structure motions . 26
9 Fatigue analysis. 27
9.1 Basic considerations. 27
9.2 Fatigue resistance. 28
9.3 Fatigue analysis procedure . 30
10 Design criteria. 35
10.1 Floating structure offset. 35
10.2 Line tension limit . 35
10.3 Grounded line length. 35
10.4 Anchoring systems. 36
10.5 Fatigue safety factor. 38
10.6 Corrosion and wear . 38
© ISO 2005 – All rights reserved iii

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SIST EN ISO 19901-7:2006
ISO 19901-7:2005(E)
10.7 Clearances. 39
10.8 Supporting structures . 39
11 Mooring hardware. 39
11.1 Mooring line components . 39
11.2 Winching equipment. 40
11.3 Monitoring equipment . 40
12 In-service inspection, monitoring and maintenance. 41
12.1 General. 41
12.2 Mobile moorings . 41
12.3 Permanent moorings. 41
13 Dynamic positioning system . 43
13.1 Basic considerations . 43
13.2 Design and analysis. 44
13.3 Design, test and maintenance . 45
13.4 Operating personnel . 45
13.5 Determination of stationkeeping capability . 45
14 Synthetic fibre rope mooring. 45
14.1 Basic considerations . 45
14.2 Fibre rope mooring analysis. 46
14.3 Fatigue analysis. 46
14.4 Creep analysis. 46
14.5 Design criteria. 47
14.6 Model testing. 48
Annex A (informative) Additional information and guidance. 49
A.1 Scope. 49
A.1.1 General. 49
A.1.2 Spread moorings (catenary, taut-line and semi-taut-line) . 49
A.1.3 Single point moorings . 50
A.1.4 Dynamic positioning (DP) systems. 51
A.1.5 Thruster-assisted moorings. 51
A.1.6 Permanent and mobile stationkeeping systems. 51
A.1.7 Mooring line components . 51
A.2 Normative references. 58
A.3 Terms and definitions. 59
A.4 Symbols and abbreviated terms. 59
A.5 Overall considerations. 59
A.5.1 Functional requirements . 59
A.5.2 Safety requirements. 59
A.5.3 Planning requirements . 61
A.5.4 Inspection and maintenance requirements. 61
A.5.5 Analytical tools. 61
A.6 Design requirements . 62
A.6.1 Exposure levels. 62
A.6.2 Limit states . 62
A.6.3 Defining design situations . 62
A.6.4 Design situations . 62
A.7 Actions. 64
A.7.1 General. 64
A.7.2 Site-specific data requirements. 64
A.7.3 Environmental actions on mooring lines . 65
A.7.4 Indirect actions. 66
A.8 Mooring analysis. 67
A.8.1 Basic considerations . 67
A.8.2 Floating structure offset. 67
A.8.3 Floating structure response. 68
A.8.4 Mooring line response. 69
A.8.5 Line tension . 71
iv © ISO 2005 – All rights reserved

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SIST EN ISO 19901-7:2006
ISO 19901-7:2005(E)
A.8.6 Line length and geometry constraints. 71
A.8.7 Anchor forces. 71
A.8.8 Typical mooring configuration analysis and assessment. 71
A.8.9 Thruster-assisted moorings. 73
A.8.10 Transient analysis of floating structure motions . 80
A.9 Fatigue analysis. 80
A.9.1 Basic considerations. 80
A.9.2 Fatigue resistance. 82
A.9.3 Fatigue analysis procedure . 84
A.10 Design criteria. 86
A.10.1 Floating structure offset. 86
A.10.2 Line tension limit . 87
A.10.3 Grounded line length. 87
A.10.4 Anchoring systems. 87
A.10.5 Fatigue safety factor. 95
A.10.6 Corrosion and wear . 95
A.10.7 Clearances. 95
A.10.8 Supporting structures . 95
A.11 Mooring hardware. 95
A.11.1 Mooring line components . 95
A.11.2 Winching equipment. 98
A.11.3 Monitoring equipment . 100
A.12 In-service inspection, monitoring and maintenance. 100
A.12.1 General. 100
A.12.2 Mobile moorings . 100
A.12.3 Permanent moorings. 100
A.13 Dynamic positioning system . 102
A.13.1 Basic considerations. 102
A.13.2 Design and analysis . 102
A.13.3 Design, test and maintenance . 103
A.13.4 Operating personnel. 104
A.13.5 Determination of stationkeeping capability . 104
A.14 Synthetic fibre rope mooring. 104
A.14.1 Basic considerations. 104
A.14.2 Fibre rope mooring analysis. 105
A.14.3 Fatigue analysis. 106
A.14.4 Creep analysis. 106
A.14.5 Design criteria. 108
A.14.6 Model testing. 108
Annex B (informative) Regional information . 109
B.1 Introduction . 109
B.1.1 General comments to the regional information. 109
B.1.2 Specific comments to the regional information . 109
B.2 Offshore Norway. 109
B.2.1 Description of region. 109
B.2.2 Regulatory framework. 109
B.2.3 Technical information.
...