CEN ISO/TR 19905-2:2013

Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 2: Jack-ups commentary and detailed sample calculation (ISO/TR 19905-2:2012)

ISO/TR 19905-2:2012 provides a commentary to some clauses of ISO 19905-1 including background information, supporting documentation, and additional or alternative calculation methods as applicable and also provides a detailed sample 'go-by' calculation. ISO 19905-1 specifies requirements and guidance for the site-specific assessment of independent leg jack‑up units for use in the petroleum and natural gas industries.

Erdöl- und Erdgasindustrie - Offshore Anlagen; Beurteilung von mobilen Offshore Einheiten bezüglich ihres Einsatzgebietes - Teil 2: Hubinseln, Erläuterungen (ISO/TR 19905-2:2012)

Industries du pétrole et du gaz naturel - Évaluation liée au site des unités marines mobiles - Partie 2: Compléments sur les plates-formes auto-élévatrices (ISO/TR 19905-2:2012)

Industrija za predelavo nafte in zemeljskega plina - Ocenjevanje mobilnih naftnih ploščadi na področju postavitve - 2. del: Dvižne ploščadi, razlaga in podroben vzorčen izračun (ISO 19905-2:2012)

General Information

• Status: Published
• Publication Date: 17-Dec-2013
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 18-Dec-2013
• Completion Date: 18-Dec-2013
• Ref Project: SIST-TP CEN ISO/TR 19905-2:2014 - Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 2: Jack-ups commentary and detailed sample calculation (ISO/TR 19905-2:2012)

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2014
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD2FHQMHYDQMHPRELOQLKQDIWQLK
SORãþDGLQDSRGURþMXSRVWDYLWYHGHO'YLåQHSORãþDGLUD]ODJDLQSRGUREHQ
Y]RUþHQL]UDþXQ,62
Petroleum and natural gas industries - Site-specific assessment of mobile offshore units -
Part 2: Jack-ups commentary and detailed sample calculation (ISO/TR 19905-2:2012)
Erdöl- und Erdgasindustrie - Offshore Anlagen; Beurteilung von mobilen Offshore
Einheiten bezüglich ihres Einsatzgebietes - Teil 2: Hubinseln, Erläuterungen (ISO/TR
19905-2:2012)
Industries du pétrole et du gaz naturel - Évaluation liée au site des unités marines
mobiles - Partie 2: Compléments sur les plates-formes auto-élévatrices (ISO/TR 19905-
2:2012)
Ta slovenski standard je istoveten z: CEN ISO/TR 19905-2:2013
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN ISO/TR 19905-2
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
December 2013
ICS 75.180.10
English Version
Petroleum and natural gas industries - Site-specific assessment
of mobile offshore units - Part 2: Jack-ups commentary and
detailed sample calculation (ISO/TR 19905-2:2012)
Industries du pétrole et du gaz naturel - Évaluation liée au Erdöl- und Erdgasindustrie - Offshore Anlagen; Beurteilung
site des unités marines mobiles - Partie 2: Compléments von mobilen Offshore Einheiten bezüglich ihres
sur les plates-formes auto-élévatrices (ISO/TR 19905- Einsatzgebietes - Teil 2: Hubinseln, Erläuterungen (ISO/TR
2:2012) 19905-2:2012)
This Technical Report was approved by CEN on 11 May 2013. It has been drawn up by the Technical Committee CEN/TC 12.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TR 19905-2:2013 E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (CEN ISO/TR 19905-2:2013) has been prepared by Technical Committee ISO/TC 67
“Materials, equipment and offshore structures for petroleum, petrochemical 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of ISO/TR 19905-2:2012 has been approved by CEN as CEN ISO/TR 19905-2:2013 without any
modification.
TECHNICAL ISO/TR
REPORT 19905-2
First edition
2012-12-15
Petroleum and natural gas industries —
Site-specific assessment of mobile
offshore units —
Part 2:
Jack-ups commentary and detailed
sample calculation
Industries du pétrole et du gaz naturel — Évaluation liée au site des
unités marines mobiles —
Partie 2: Compléments sur les plates-formes auto-élévatrices

Reference number
ISO/TR 19905-2:2012(E)
©
ISO 2012
ISO/TR 19905-2:2012(E)
©  ISO 2012
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
ISO's member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
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Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO/TR 19905-2:2012(E)
Contents Page
Foreword .v
Introduction.vii
1 Scope.1
2 References .1
3 Terms and definitions .1
4 Symbols.1
4.1 Symbols for Clause 6.1
4.2 Symbols for Clause 7.3
4.3 Symbols for Clause 8.5
4.4 Symbols for Clause 9.6
4.5 Symbols for Clause 10.6
4.6 Symbols for Clause 12.8
5 Commentary on ISO 19905-1:2012, Clauses 5 and A.5 .8
6 Commentary on ISO 19905-1:2012, Clauses 6 and A.6 .8
TR.6.4.1 Metocean data — General.8
TR.6.4.2 Waves .8
TR.6.4.3 Current.20
TR.6.4.4 Water depths.20
TR.6.4.5 Wind .21
7 Commentary to ISO 19905-1:2012, Clauses 7 and A.7 .24
TR.7.1 Scope .24
TR.7.3.2 Hydrodynamic model .24
TR.7.3.2.1.1 Length of members .24
TR.7.3.2.1.2 Spudcan.24
TR.7.3.2.1.3 Shielding and solidification.24
TR.7.3.2.2 “Detailed” leg model .25
TR.7.3.2.3 “Equivalent” leg model .25
TR.7.3.2.3.1 Equivalent drag coefficient.25
TR.7.3.2.3.2 Equivalent inertia coefficient.26
TR.7.3.3 Wave and current actions.48
TR.7.3.4 Wind actions .57
TR.7.8 Other considerations.57
APPENDIX TR.7.A : Example of equivalent model computations.58
APPENDIX TR.7.B: Comparison cases to assess implications of the ISO 19905-1 formulation .63
APPENDIX TR.7.C: Comparison of test results for chords.67
8 Commentary to ISO 19905-1:2012, Clauses 8 and A.8 .70
TR A.8.8.6 Derivation of the alternative simplified negative stiffness correction term for P-∆
effects .70
9 Commentary to ISO 19905-1:2012, Clauses 9 and A.9 .77
TR.9.3.6.2 Derivation of the limiting horizontal reaction given in ISO 19905-1:2012, Table A.9.3.7 .77
10 Commentary to ISO 19905-1:2012, Clauses 10 and A.10 .79
TR.10.4.2.1 Natural period — General .79
TR.10.4.2.2 Derivation of K , effective stiffness used to calculate the jack-up natural period.82
e
TR.10.4.3.3 Hysteretic damping .95
TR.10.4.3.4 Vertical radiation damping in earthquake analysis .96
TR.10.5.3.4 / C.2.4 Guidance on the fourth method of ISO 19905-1:2012, Table A.10.5.1 —
Application of the drag-inertia method .96
ISO/TR 19905-2:2012(E)
11 Commentary to ISO 19905-1:2012, Clauses 11 and A.11.96
12 Commentary to ISO 19905-1:2012, Clauses 12 and A.12.96
TR.12.6.2.2 Nominal bending strength .96
TR.12.6.2.2.1 Example .96
TR.12.6.3.2 Background for η in interaction equation approach.97
13 Commentary to ISO 19905-1:2012, Annex C .98
TR.C.2.4 Guidance on the fourth method of ISO 19905-1:2012, Table A.10.5.1 — Application of
the drag-inertia method.98
Annex A (informative) Detailed example calculation.99
Annex B (informative) SIPM “drag-inertia method” for dynamic analysis and estimation of
extreme response for jack-ups.266
Bibliography .295

iv © ISO 2012 – All rights reserved

ISO/TR 19905-2:2012(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
a
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