prEN ISO 19901-7

SLOVENSKI STANDARD
oSIST prEN ISO 19901-7:2018
01-januar-2018
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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/DIS 19901-7:2017)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen an Offshore-Anlagen - Teil 7:
Betriebssysteme für das Positionshalten schwimmender Anlagen und mobiler Offshore-
Einheiten (ISO/DIS 19901-7:2017)
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 (ISO/DIS 19901-7:2017)
Ta slovenski standard je istoveten z: prEN ISO 19901-7
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
oSIST prEN ISO 19901-7:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 19901-7:2018

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oSIST prEN ISO 19901-7:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 19901-7
ISO/TC 67/SC 7 Secretariat: BSI
Voting begins on: Voting terminates on:
2017-11-06 2018-01-29
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
ICS: 75.180.10
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 19901-7:2017(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2017

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oSIST prEN ISO 19901-7:2018
ISO/DIS 19901-7:2017(E) ISO/DIS 19901-7:2017(E)

Contents Page
1 Scope.8
2 Normative references.9
3 Terms and definitions .9
4 Symbols and abbreviated terms .15
4.1 Symbols.15
4.2 Abbreviated terms .16
5 Overall considerations.18
5.1 General requirements .18
5.2 Functional requirements.18
5.3 Safety requirements .18
5.4 Planning requirements.19
5.5 Rules and regulations.20
5.6 Independent verification.20
5.7 Analytical tools .20
6 Design requirements.20
6.1 Exposure levels .20
6.2 Limit states.21
6.3 Defining design situations.21
6.4 Design situations.21
7 Actions.25
7.1 General .25
7.2 Site-specific data requirements .25
7.3 Environmental actions on mooring lines.27
7.4 Indirect actions .27
8 Mooring analysis .30
8.1 Basic considerations .30
8.2 Actions considerations.31
8.3 Floating structure response.32
8.4 Floating structure offset .37
8.5 Mooring line response .38
8.6 Line tension .38
8.7 Line length and geometry constraints .39
8.8 Anchor forces .40
8.9 Typical mooring configuration analysis and assessment .40
8.10 Thruster-assisted moorings.41
8.11 Transient analysis of floating structure motions.43
9 Fatigue analysis.44
9.1 Basic considerations .44
9.2 Tension-tension (T-T) fatigue.45
COPYRIGHT PROTECTED DOCUMENT
9.3 Bending-Tension (B-T) fatigue.53
9.4 Other types of fatigue loading .55
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
10 Design criteria.56
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
10.1 Floating structure offset .56
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
10.2 Line tension limit .56
the requester.
10.3 Grounded line length .56
ISO copyright office
10.4 Anchoring systems .57
Ch. de Blandonnet 8 • CP 401
10.5 Mooring line fatigue safety factor.59
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
10.6 Corrosion and wear.59
Fax +41 22 749 09 47
10.7 Clearances .60
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
© ISO 2017 – All rights reserved iii

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oSIST prEN ISO 19901-7:2018
ISO/DIS 19901-7:2017(E)
Contents Page
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Symbols and abbreviated terms . 15
4.1 Symbols . 15
4.2 Abbreviated terms . 16
5 Overall considerations . 18
5.1 General requirements . 18
5.2 Functional requirements . 18
5.3 Safety requirements . 18
5.4 Planning requirements . 19
5.5 Rules and regulations . 20
5.6 Independent verification . 20
5.7 Analytical tools . 20
6 Design requirements . 20
6.1 Exposure levels . 20
6.2 Limit states . 21
6.3 Defining design situations . 21
6.4 Design situations . 21
7 Actions. 25
7.1 General . 25
7.2 Site-specific data requirements . 25
7.3 Environmental actions on mooring lines . 27
7.4 Indirect actions . 27
8 Mooring analysis . 30
8.1 Basic considerations . 30
8.2 Actions considerations . 31
8.3 Floating structure response . 32
8.4 Floating structure offset . 37
8.5 Mooring line response . 38
8.6 Line tension . 38
8.7 Line length and geometry constraints . 39
8.8 Anchor forces . 40
8.9 Typical mooring configuration analysis and assessment . 40
8.10 Thruster-assisted moorings . 41
8.11 Transient analysis of floating structure motions . 43
9 Fatigue analysis . 44
9.1 Basic considerations . 44
9.2 Tension-tension (T-T) fatigue . 45
9.3 Bending-Tension (B-T) fatigue . 53
9.4 Other types of fatigue loading . 55
10 Design criteria . 56
10.1 Floating structure offset . 56
10.2 Line tension limit . 56
10.3 Grounded line length . 56
10.4 Anchoring systems . 57
10.5 Mooring line fatigue safety factor . 59
10.6 Corrosion and wear . 59
10.7 Clearances . 60
© ISO 2017 – All rights reserved iii

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oSIST prEN ISO 19901-7:2018
ISO/DIS 19901-7:2017(E)
10.8 Supporting structures . 60
10.9 Installation considerations . 61
11 Mooring hardware . 61
11.1 Mooring line components . 61
11.2 Winching equipment. 63
11.3 Winches should meet the provisions specified in internationally recognized design
standards, see A.11.2 and the requirements of a RCS.Monitoring equipment . 63
12 In-service inspection, monitoring and maintenance . 64
12.1 General . 64
12.2 Mobile moorings . 64
12.3 Permanent moorings . 65
13 Dynamic positioning system . 67
13.1 Basic considerations . 67
13.2 Design and analysis . 68
13.3 Design, test and maintenance . 68
13.4 Operating personnel . 69
13.5 Determination of stationkeeping capability . 69
14 Synthetic fibre rope mooring . 69
14.1 Basic considerations . 69
14.2 Fibre rope mooring analysis . 70
14.3 Fatigue analysis . 70
14.4 Creep analysis . 71
14.5 Design criteria . 71
14.6 Model testing . 72
Annex A (informative) Additional information and guidance . 73
A.1 Scope . 73
A.2 Normative references . 82
A.3 Terms and definitions . 82
A.4 Symbols and abbreviated terms . 83
A.5 Overall considerations . 83
A.6 Design requirements . 87
A.7 Actions . 90
A.8 Mooring analysis. 100
A.9 Fatigue analysis . 125
A.10 Design criteria . 132
A.11 Mooring hardware . 161
A.12 In-service inspection, monitoring and maintenance . 172
A.13 Dynamic positioning system . 174
A.14 Synthetic fibre rope mooring . 177
Annex B (informative) Regional information . 182
B.1 Introduction . 182
B.2 Offshore Norway . 182
B.3 Canada . 186
B.4 Russia . 187

iv © ISO 2017 – All rights reserved

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oSIST prEN ISO 19901-7:2018
ISO/DIS 19901-7:2017(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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/XXX
This second/third/. edition cancels and replaces the first/second/. edition (), [clause(s) / subclause(s) /
table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.
ISO XXXX consists of the following parts. [Add information as necessary.]

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 third edition cancels and replaces the second edition (ISO 19901-7:2013), which has been technically
revised.
© ISO 2017 – All rights reserved v

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oSIST prEN ISO 19901-7:2018
ISO/DIS 19901-7:2017(E)
This third edition of ISO 19901-7 includes several changes. The largest changes are the deletion of
informative sections related to geotechnical design of anchors to incorporate the same in 19901-4 and the
inclusion of OPB fatigue guidance.
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 3: Topsides structure
 Part 4: Geotechnical and foundation design considerations
 Part 5: Weight control during engineering and construction
 Part 6: Marine operations
 Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
 Part 8: Marine
...