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ISO 19901-7:2005

(Main)

Petroleum and natural gas industries — Specific requirements for offshore structures — Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units

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 specifies methodologies for a) the design, analysis and evaluation of stationkeeping systems for floating structures used by the oil and gas industries to support production, storage, drilling, well intervention and production, production and storage, drilling, well intervention, production and storage, and b) the assessment of stationkeeping systems for site-specific applications of mobile offshore units (e.g. mobile offshore drilling units, construction units, and pipelay 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

General Information

Status
Withdrawn
Publication Date
06-Dec-2005
Withdrawal Date
06-Dec-2005
ICS
75.180.10 - Exploratory, drilling and extraction equipment
Technical Committee
ISO/TC 67/SC 7 - Offshore structures
Drafting Committee
ISO/TC 67/SC 7 - Offshore structures
Current Stage
9599 - Withdrawal of International Standard
Completion Date
26-Apr-2013
Ref Project

Relations

Revised
ISO 19901-7:2013 - Petroleum and natural gas industries — Specific requirements for offshore structures — Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
Effective Date
12-Feb-2011
Consolidates
ISO/IEC ISP 10609-34:1995 - Information technology — International Standardized Profiles TB, TC, TD and TE — Connection-mode Transport Service over connection-mode Network Service — Part 34: Definition of profile TC43111
Effective Date
06-Jun-2022
Revises
ISO/TR 13637:1997 - Petroleum and natural gas industries — Mooring of mobile offshore drilling units (MODUS) — Design and analysis
Effective Date
15-Apr-2008

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ISO 19901-7:2005 - Petroleum and natural gas industries -- Specific requirements for offshore structuresISO 19901-7:2005 - Petroleum and natural gas industries -- Specific requirements for offshore structures
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ISO 19901-7:2005 - Petroleum and natural gas industries -- Specific requirements for offshore structures
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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

---------------------- Page: 1 ----------------------
ISO 19901-7:2005(E)
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©  ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
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ii © ISO 2005 – All rights reserved

---------------------- Page: 2 ----------------------
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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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

---------------------- Page: 4 ----------------------
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. 110
B.2.4 Technical commentary. 112
B.2.5 Additional national requirements. 112
Bibliography . 113

© ISO 2005 – All rights reserved v

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ISO 19901-7:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 19901-7 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore structures.
This first edition of ISO 19901-7 cancels and replaces ISO/TR 13637:1997, of which it constitutes a technical
revision.
ISO 19901 consists of the following parts, under the general title Petroleum and natural gas industries —
Specific requirements for offshore structures:
⎯ Part 1: Metocean design and operating considerations
⎯ Part 2: Seismic design procedures and criteria
⎯ Part 4: Geotechnical and foundation design considerations
⎯ Part 5: Weight control during engineering and construction
⎯ Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
The following parts are under preparation:
⎯ Part 3: Topsides structure
⎯ Part 6: Marine operations
ISO 19901 is one of a series of standards for offshore structures. The full series consists of the following
International Standards.
⎯ ISO 19900, Petroleum and natural gas industries — General requirements for offshore structures
⎯ ISO 19901 (all parts), Petroleum and natural gas industries — Specific requirements for offshore
structures
vi © ISO 2005 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 19901-7:2005(E)
1)
⎯ ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
1)
⎯ ISO 19903, Petroleum and natural gas industries — Fixed concrete offshore structures
⎯ ISO 19904-1, Petroleum and natural gas industries — Floating offshore structures — Part 1: Monohulls,
2)
semi-submersibles and spars
⎯ ISO 19904-2, Petroleum and natural gas industries — Floating offshore structures — Part 2: Tension leg
3)
platforms
⎯ ISO 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
3)
units — Part 1: Jack-ups
⎯ ISO/TR 19905-2, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
3)
units — Part 2: Jack-ups commentary
3)
⎯ ISO 19906, Petroleum and natural gas industries — Arctic offshore structures

1) To be published.
2) To be published.
3) Under preparation.
© ISO 2005 – All rights reserved vii

---------------------- Page: 7 ----------------------
ISO 19901-7:2005(E)
Introduction
The series of International Standards applicable to types of offshore structure, ISO 19900 to ISO 19906,
constitutes a common basis covering those aspects that address design requirements and assessments of all
offshore structures used by the petroleum, petrochemical and natural gas industries worldwide. Through their
application the intention is to achieve reliability levels appropriate for manned and unmanned offshore
structures, whatever type of structure and nature or combination of materials used.
It is important to recognize that structural integrity is an ove
...

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ISO 19904-1:2019(Main)
Petroleum and natural gas industries — Floating offshore structures — Part 1: Ship-shaped, semi-submersible, spar and shallow-draught cylindrical structures

This document provides requirements and guidance for the structural design and/or assessment of floating offshore platforms used by the petroleum and natural gas industries to support the following functions: — production; — storage and/or offloading; — drilling and production; — production, storage and offloading; — drilling, production, storage and offloading. NOTE 1 Floating offshore platforms are often referred to using a variety of abbreviations, e.g. FPS, FSU, FPSO (see Clauses 3 and 4), in accordance with their intended mission. NOTE 2 In this document, the term "floating structure", sometimes shortened to "structure", is used as a generic term to indicate the structural systems of any member of the classes of platforms defined above. NOTE 3 In some cases, floating platforms are designated as "early production platforms". This term relates merely to an asset development strategy. For the purposes of this document, the term "production" includes "early production". This document is not applicable to the structural systems of mobile offshore units (MOUs). These include, among others, the following: — floating structures intended primarily to perform drilling and/or well intervention operations (often referred to as MODUs), even when used for extended well test operations; — floating structures used for offshore construction operations (e.g. crane barges or pipelay barges), for temporary or permanent offshore living quarters (floatels), or for transport of equipment or products (e.g. transportation barges, cargo barges), for which structures reference is made to relevant recognized classification society (RCS) rules. This document is applicable to all possible life-cycle stages of the structures defined above, such as: — design, construction and installation of new structures, including requirements for inspection, integrity management and future removal, — structural integrity management covering inspection and assessment of structures in-service, and — conversion of structures for different use (e.g. a tanker converted to a production platform) or re‑use at different locations. The following types of floating structure are explicitly considered within the context of this document: a) ship-shaped structures and barges; b) semi-submersibles; c) spars; d) shallow-draught cylindrical structures. In addition to the structural types listed above, this document covers other floating platforms intended to perform the above functions, consisting of partially submerged buoyant hulls made up of any combination of plated and space frame components. These other structures can have a great range of variability in geometry and structural forms (e.g. tension leg platforms) and, therefore, can be only partly covered by the requirements of this document. In other cases, specific requirements stated in this document can be found not to apply to all or part of a structure under consideration. NOTE 4 Requirements for topsides structures are presented in ISO 19901-3. In the above cases, conformity with this document requires the design to be based upon its underpinning principles and to achieve a level of safety equivalent, or superior, to the level implicit in it. NOTE 5 The speed of evolution of offshore technology often far exceeds the pace at which the industry achieves substantial agreement on innovation in structural concepts, structural shapes or forms, structural components and associated analysis and design practices, which are continuously refined and enhanced. On the other hand, International Standards can only capture explicit industry consensus, which requires maturation and acceptance of new ideas. Consequently, advanced structural concepts can, in some cases, only be partly covered by the requirements of this document. This document is applicable to steel floating structures. The principles documented herein are, however, considered to be generally applicable to structures fabricated in materials other

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