Petroleum and natural gas industries Site-specific assessment of mobile offshore units Part 2: Jack-ups commentary and detailed sample calculation




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ISO/PDTR 19905-2.3

ISO TC 67/SC 7 N WG7-52

Date:   2012-06-08

ISO/PDTR 19905-2.3

ISO TC 67/SC 7/WG 7

Secretariat:   BSI

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 spécifique au site d'unités mobiles en mer — Partie 2: Plates-formes auto-élévatrices commentaire et calcul détaillé d'échantillon

Date

Name

Details

2010-10-15

ISO-DIS_19905-2_(E) 2010-10-15

Initial compilation - Much ISO-ising remains to do.
Need to agree sub-heading approach/structure.

2011-04-18

ISO-DIS_19905-2_(E) 2011-04-18

For review during OTC week meetings

2011-06-08

ISO-DIS_19905-2_(E) 2011-06-08

Incorporating comments from OTC week meetings and subsequent contributions from panels & editor.

2012-04-28

ISO_TR_19905-2_(E)-2011-06-08-accepted-2012-01-03.doc

Updates from & subsequent to Sept 11 Panel meetings

2012-05-15

ISO_TR_19905-2_(E)-2012-05-15.doc

With updates to resolve lat remaining issues.

2012-06-08

ISO_TR_19905-2_(E)-2012-06-08.doc

With updates to resolve comments on updated "go-by"

Copyright notice

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Contents Page

Foreword vi

Introduction viii

1 Scope 1

2 References 1

3 Definitions 1

4 Symbols and abbreviated terms 1

4.1 Symbols 1

4.1.1 Symbols for clause 6 1

4.1.2 Symbols for clause 7 3

4.1.3 Symbols for clause 8 5

4.1.4 Symbols for clause 9 6

4.1.5 Symbols for clause 10 6

4.1.6 Symbols for clause 12 8

4.2 Abbreviated terms 8

5 Commentary on clauses 5 and A.5 of ISO 19905-1 8

6 Commentary on clauses 6 and A.6 of ISO 19905-1 8

TR.6.4.1 Metocean data - general 8

TR.6.4.2 Waves 9

TR.6.4.2.2 Extreme wave height 9

TR.6.4.2.3 Deterministic waves 9

TR.6.4.2.3.1 Comparison of wave loads obtained using different wave theories for regular and irregular wave analyses 11

TR.6.4.2.4 Wave crest elevation 13

TR.6.4.2.5 Wave spectrum 13

TR.6.4.2.6 Airy wave height correction for stochastic analysis 16

TR.6.4.2.8 Short-crested stochastic waves 18

TR.6.4.2.8.1 Directional spreading functions according to SNAME 18

TR.6.4.2.8.2 Directional spreading functions according to ISO 19901-1 19

TR.6.4.2.8.3 Comparison of directional spreading functions in SNAME and ISO 19901-1 20

TR.6.4.3 Current 21

TR.6.4.4 Water depths 21

TR.6.4.5 Wind 22

7 Commentary to clauses 7 and A.7, actions of ISO 19905-1 25

TR.7.1 Scope 25

TR.7.3.2 Hydrodynamic model 25

TR.7.3.2.1 - General 25

TR.7.3.2.1.1 Length of members 25

TR.7.3.2.1.2 Spudcan 25

TR.7.3.2.1.3 - Shielding and solidification 25

TR.7.3.2.2 'Detailed’ leg model 26

TR.7.3.2.3 'Equivalent’ leg model 26

TR.7.3.2.3.1 Equivalent drag coefficient 26

TR.7.3.2.3.2 Equivalent Inertia coefficient 27

TR.7.3.2.4 Drag and inertia coefficients 27

TR.7.3.2.5 Marine growth 49

TR.7.3.3 Wave and current actions 50

TR.7.3.3.2 Hydrodynamic actions 50

TR.7.3.3.2.2 Drag action 50

TR.7.3.3.2.3 Inertia actions 52

TR.7.3.3.3 Wave models 53

TR.7.3.3.3.1 Deterministic waves 53

TR.7.3.3.3.2 Stochastic waves 54

TR.7.3.3.4 Current 57

TR.7.3.3.4.1 - General 57

TR.7.3.3.4.2 Combination with wave particle velocities 57

TR.7.3.3.4.3 Reduction of current by the actuator disc formula 57

TR.7.3.3.4.4 Current stretching 58

TR.7.3.4 Wind actions 58

TR.7.8 Other considerations 58

APPENDIX TR.7.A : Example of equivalent model computations 60

APPENDIX TR.7.B : Comparison cases to assess implications of the ISO 19905-1 formulation 65

APPENDIX TR.7.C : Comparison of test results for chords 69

8 Commentary to clauses 8 and A.8 of ISO 19905-1 72

TR A.8.8.6 Derivation of the alternative simplified negative stiffness correction term for P-Δ effects 72

TR A.8.8.6.1 Summary 72

TR A.8.8.6.2 Description of the method 72

TR A.8.8.6.3 Basis for the method 72

TR A.8.8.6.4 Derivation of the simplified correction term 73

Determine effect on stiffness 75

Effect on total jack-up stiffness: 75

TR A.8.8.6.5 Verification against an 'exact' solution 76

9 Commentary to clauses 9 and A.9 of ISO 19905-1 80

TR.9.3.6.2 Derivation of the limiting horizontal reaction given in ISO 19905-1, Table A.9.3.7 80

10 Commentary to clauses 10 and A.10 of ISO 19905-1 82

TR.10.4.2.1 Natural period - general 82

TR.10.4.2.2 Derivation of Ke , effective stiffness used to calculate the jack-up natural period 85

TR.10.4.3.3 Hysteretic damping 98

TR.10.4.3.4 Vertical radiation damping in earthquake analysis 99

TR.10.5.3.4 / C.2.4 Guidance on the fourth method of ISO 19905‑1, Table A.10.5.1, Application of the drag-inertia method. 99

11 Commentary to clauses 11 and A.11 of ISO 19905-1 100

12 Commentary to clauses 12 and A.12 of ISO 19905-1 101

TR.12.6.2.2 Nominal Bending Strength 101

TR.12.6.2.2.1 Example 101

TR.12.6.3.2 Background for  in interaction equation approach 102

13 Commentary to Annex C of ISO 19905-1 104

TR.C.2.4 Guidance on the fourth method of ISO 19905-1 Table A.10.5.1: Application of the drag-inertia method. 104

Annex A (informative) Detailed example calculation 105

A.1 Introductory comments 106

A.1.1 General points 106

A.1.2 How to use the document 106

A.1.3 Navigation within the document 107

A.1.4 Key to Symbols 108

A.2 Initial steps in the analysis of the “typical jack-up” 109

A.2.1 Initial route, introduction and overall considerations 109

A.2.2 Overall analysis FLOW CHART as given in Figure 5.2-1 of ISO 112

A.3 Data Assembly 113

A.3.1 Obtain jack-up data 113

A.3.2 Obtain site and metocean data 115

A.6.4.2.3 Deterministic waves 116

A.6.4.2.4 Wave crest elevation: 117

A.6.4.2.5 Wave spectrum: 117

A.6.4.2.7 Peak and zero upcrossing periods 117

A.6.4.2.8 Short crestedness 117

A.6.4.2.9 Maximizing the wave/current response 117

A.6.4.3 Current 118

A.6.4.4 Waterdepth 118

A.6.4.5 Marine growth 119

A.6.4.6 Wind 119

A.6.4.6.2 Wind Profile 119

A.3.3 Obtain geotechnical data 119

A.4 Other limiting aspects 121

A.5 Establish assessment configuration and situation(s) 122

A.5.1 Determine hull elevation 122

A.5.2 Select conditions for ULS 123

A.5.3 Assessment situation 124

A.5.4 Exposure level 126

A.5.5 Estimate leg penetrations 126

A.6 Assessment of leg length 133

A.7 Review existing calculations 134

A.8 Establish actions, prepare analysis and foundation models 135

A.8.1 Establish actions 135

A.8.2 Prepare analysis models 152

A.8.3 Determine foundation models 176

9.3.1 Introduction 176

A.9.3.3.2 Ultimate vertical/horizontal/rotational capacity interaction function. 176

A.9 Apply actions and determine response 184

A.9.1 Application of actions 184

A.9.2 Determine responses - foundation response 191

A.9.3 Determine responses - structural response 193

A.9.4 Determine dynamic response 202

A.9.5 Determine quasi-static response 215

A.9.6 Effect of fixity on dynamic response 222

A.10 Structural and overturning assessment 223

A.10.1 Acceptance criteria 223

A.10.2 Structural strength assessment 224

A.10.3 Spudcan strength assessment 255

A.10.4 Overturning stability assessment 256

A.11 Assessment of foundation 258

A.12 APPENDIX A.A Guidance on Additional Dynamic Loadcase Calculations for Tn/Tp>0.9 - per A.10.5.2.2.3 271

A.13 APPENDIX A.B Data sheet for the “typical jack‑up” 279

A.13.1 Example contents list for typical site assessment report (Annex G) 280

A.13.2 Example data sheets used as basis for this assessment attached: 282

A.13.3 Metocean conditions 286

Annex B (informative) SIPM "drag-inertia method" for dynamic analysis and estimation of extreme response for jack-ups 287

Bibliography 317

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.

In exceptional circumstances, when a technical committee has collected data of a different kind from that which is normally published as an International Standard (“state of the art”, for example), it may decide by a simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be reviewed until the data it provides are considered to be no longer valid or useful.

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/TR 19905-2 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

ISO 19905 consists of the following parts, under the general title Petroleum and natural gas industries — Site-specific assessment of mobile offshore units:

  • Part 1: Jack-ups

  • Part 2: Jack-ups commentary and detailed sample calculation (Technical Report)

The following part is under preparation:

  • Part 3; Floating units

ISO 19905 is one of a series of International 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 19901-1, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 1: Metocean design and operating considerations

  • ISO 19901-2, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 2: Seismic design procedures and criteria

  • ISO 19901-3, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 3: Topsides structure

  • ISO 19901-4, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 4: Geotechnical and foundation design considerations

  • ISO 19901-5, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 5: Weight control during engineering and construction

  • ISO 19901-6, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 6: Marine operations

  • ISO 19901-7, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units

  • ISO 19901-81), Petroleum and natural gas industries — Specific requirements for offshore structures — Part 8: Marine soil investigation

  • ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures

  • 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, semi-submersibles and spars

  • ISO 19904-21), Petroleum and natural gas industries — Floating offshore structures — Part 2: Tension leg platforms

  • ISO 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore units — Part 1: Jack‑ups

  • ISO TR 19905-2, Petroleum and natural gas industries — Site-specific assessment of mobile offshore units — Part 2: Jack‑ups commentary and detailed sample calculation

  • ISO TR 19905-31), Petroleum and natural gas industries — Site-specific assessment of mobile offshore units — Part 3: Floating units

  • ISO 19906, Petroleum and natural gas industries — Arctic offshore structures

Introduction

The series of International Standards applicable to types of offshore structures, ISO 19900 to ISO 19906, addresses design requirements and assessments for all offshore structures used by the petroleum and natural gas industries worldwide. Through their application, the intention is to achieve reliability levels appropriate for manned and unmanned offshore structures, whatever the type of structure and the nature or combination of the materials used.

It is important to recognize that structural integrity is an overall concept comprising models for describing actions, structural analyses, design or assessment rules, safety elements, workmanship, quality control procedures and national requirements, all of which are mutually dependent. The modification of one aspect of the design or assessment in isolation can disturb the balance of reliability inherent in the overall concept or structural system. The implications involved in modifications, therefore, need to be considered in relation to the overall reliability of offshore structural systems.

The series of International Standards applicable to the various types of offshore structure is intended to provide a wide latitude in the choice of structural configurations, materials and techniques without hindering innovation. Sound engineering judgement is therefore necessary in the use of these International Standards.

ISO 19905-1 was developed from SNAME T&R Bulletin 5-5A, but has been considerably altered from that original document. Some of the alterations have involved a restructuring and modification of terminology, but there have been additional changes of greater technical consequence. New material has been added based on studies undertaken since the original development of SNAME T&R 5-5A; new calculation techniques have been addressed because of improved computational capabilities allowing more complex assessments; gaps that existed in the original SNAME T&R 5-5A have been filled, thereby ensuring a more thorough assessment; and changes have been made to align ISO 19905-1 with other standards within the 19900 series. A description of the more important changes, along with the reasoning for the changes, can be found in a series of papers published in 2012 by Offshore Technology Conference. These papers can be of considerable value in helping the analyst, particularly those who are familiar with SNAME T&R 5-5A, in understanding ISO 19905‑1. The papers, part of the Technical Session "ISO 19905-1: A Site-Specific Assessment of Mobile Jack-Up Units“ are titled:

Background to the ISO 19905-Series and an Overview of the New ISO 19905-1 for the Site-Specific Assessment of Mobile Jack-Up Units, M.J.R. Hoyle, GL Noble Denton; J.J. Stiff, ABSG Consulting; R.J. Hunt, Shell E&P UK , OTC 2012, 23047

Environmental Actions in the New ISO for the Site-Specific Assessment of Mobile Jack-Up Units, M.J. Dowdy, Rowan Companies; M. Hoyle, GL Noble Denton; J.J. Stiff, ABS Consulting, OTC 2012, 23342

Structural Modeling and Response Analysis in the New ISO Standard for the Site-Specific Assessment of Mobile Jack-Up Units, P. Tan, B. Mobbs, Cameron International Corporation; M. Perry, Keppel Offshore & Marine Technology Center; J.J. Stiff, ABSG Consulting; D.J. Stock, Digital Structures, OTC 2012, 23040

Foundation Modeling and Assessment in the New ISO Standard 19905-1, P.C. Wong, ExxonMobil Development Company; J.S. Templeton III, SAGE USA; O.A. Purwana, Keppel Offshore & Marine; H. Hofstede, GustoMSC Engineers; M.J. Cassidy, M.S. Hossain, University of Western Australia; H. Hugo, GustoMSC; C. Martin, Oxford University, OTC 2012, 23521

Long-Term Applications in the ISO Standard for Site Specific Assessment of Mobile Jack-Up Units and the Use of Skirted Spudcans, G. Kudsk, H. Stadsgaard, Maersk Drilling, OTC 2012, 23337

Structural Acceptance Criteria in the New ISO for the Site-Specific Assessment of Mobile Jack-Up Units, P.A. Frieze, PAFA Consulting Engineers; D.R. Lewis, Lewis Engineering Group; J.J. Stiff, ABSG Consulting, OTC 2012, 23071

The Benchmarking of the New ISO for the Site-Specific Assessment of Mobile Jack-Up Units, J.J. Stiff, ABSG Consulting; D.R. Lewis, Lewis Engineering Group, OTC 2012, 22949

This part of ISO 19905, which has been developed from SNAME T&R5-5A[3], provides a commentary to some clauses of ISO 19905-1[1] including background information, supporting documentation, and additional or alternative calculation methods as applicable and also provides a detailed sample 'go-by' calculation in Annex A. The reader should recognize that the information presented herein should only be taken in conjunction with ISO 19905-1 and that the cautions and limitations discussed in ISO 19905-1 apply.

Petroleum and natural gas industries — Site-specific assessment of mobile offshore units — Part 2: Jack-ups commentary and detailed sample calculation
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