BS EN ISO 19905-1:2012
$215.11
Petroleum and natural gas industries. Site-specific assessment of mobile offshore units – Jack-ups
| Published By | Publication Date | Number of Pages |
| BSI | 2012 | 322 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 11 | 1 Scope |
| 12 | 2 Normative references 3 Terms and definitions |
| 23 | 4 Symbols and abbreviated terms 4.1 Symbols |
| 24 | 4.2 Abbreviated terms |
| 25 | 5 Overall considerations 5.1 General 5.1.1 Competency 5.1.2 Planning 5.1.3 Assessment situations and associated criteria |
| 26 | 5.1.4 Reporting 5.1.5 Regulations 5.2 Assessment approach |
| 28 | 5.3 Selection of limit states 5.4 Determination of assessment situations 5.4.1 General |
| 29 | 5.4.2 Reaction point and foundation fixity 5.4.3 Extreme storm event approach angle 5.4.4 Weights and centre of gravity 5.4.5 Hull elevation 5.4.6 Leg length reserve 5.4.7 Adjacent structures |
| 30 | 5.4.8 Other 5.5 Exposure levels 5.5.1 General 5.5.2 Life-safety categories |
| 31 | 5.5.3 Consequence categories |
| 33 | 5.5.4 Determination of exposure level 5.6 Analytical tools |
| 34 | 6 Data to assemble for each site 6.1 Applicability 6.2 Jack-up data 6.3 Site and operational data 6.4 Metocean data |
| 35 | 6.5 Geophysical and geotechnical data |
| 36 | 6.6 Earthquake data 7 Actions 7.1 Applicability 7.2 General |
| 37 | 7.3 Metocean actions 7.3.1 General 7.3.2 Hydrodynamic model 7.3.3 Wave and current actions 7.3.4 Wind actions |
| 38 | 7.4 Functional actions 7.5 Displacement dependent effects 7.6 Dynamic effects 7.7 Earthquakes 7.8 Other actions 8 Structural modelling 8.1 Applicability 8.2 Overall considerations 8.2.1 General |
| 39 | 8.2.2 Modelling philosophy 8.2.3 Levels of FE modelling 8.3 Modelling the leg 8.3.1 General 8.3.2 Detailed leg 8.3.3 Equivalent leg (stick model) |
| 40 | 8.3.4 Combination of detailed and equivalent leg 8.3.5 Stiffness adjustment 8.3.6 Leg inclination 8.4 Modelling the hull 8.4.1 General 8.4.2 Detailed hull model 8.4.3 Equivalent hull model 8.5 Modelling the leg-to-hull connection 8.5.1 General 8.5.2 Guide systems 8.5.3 Elevating system |
| 41 | 8.5.4 Fixation system 8.5.5 Shock pad – floating jacking systems 8.5.6 Jackcase and associated bracing 8.5.7 Equivalent leg-to-hull stiffness 8.6 Modelling the spudcan and foundation 8.6.1 Spudcan structure 8.6.2 Seabed reaction point 8.6.3 Foundation modelling |
| 42 | 8.7 Mass modelling 8.8 Application of actions 8.8.1 Assessment actions 8.8.1.1 General |
| 43 | 8.8.1.2 Two-stage deterministic storm analysis 8.8.1.3 Stochastic storm analysis 8.8.1.4 Earthquake analysis |
| 44 | 8.8.2 Functional actions due to fixed load and variable load 8.8.3 Hull sagging 8.8.4 Metocean actions 8.8.5 Inertial actions |
| 45 | 8.8.6 Large displacement effects 8.8.7 Conductor actions 8.8.8 Earthquake actions 9 Foundations 9.1 Applicability 9.2 General |
| 46 | 9.3 Geotechnical analysis of independent leg foundations 9.3.1 Foundation modelling and assessment 9.3.2 Leg penetration during preloading |
| 47 | 9.3.3 Yield interaction 9.3.4 Foundation stiffnesses 9.3.5 Vertical-horizontal foundation capacity envelopes |
| 48 | 9.3.6 Acceptance checks |
| 49 | 9.4 Other considerations 9.4.1 Skirted spudcans 9.4.2 Hard sloping strata |
| 50 | 9.4.3 Footprint considerations 9.4.4 Leaning instability 9.4.5 Leg extraction difficulties 9.4.6 Cyclic mobility 9.4.7 Scour 9.4.8 Spudcan interaction with adjacent infrastructure |
| 51 | 9.4.9 Geohazards 9.4.10 Carbonate material 10 Structural response 10.1 Applicability 10.2 General considerations 10.3 Types of analyses and associated methods |
| 52 | 10.4 Common parameters 10.4.1 General 10.4.2 Natural periods and affecting factors 10.4.2.1 General |
| 53 | 10.4.2.2 Stiffness 10.4.2.3 Mass 10.4.2.4 Variability in natural period 10.4.2.5 Cancellation and reinforcement 10.4.3 Damping |
| 54 | 10.4.4 Foundations 10.4.5 Storm excitation 10.5 Storm analysis 10.5.1 General |
| 55 | 10.5.2 Two-stage deterministic storm analysis |
| 56 | 10.5.3 Stochastic storm analysis 10.5.4 Initial leg inclination 10.5.5 Limit state checks |
| 57 | 10.6 Fatigue analysis 10.7 Earthquake analysis 10.8 Accidental situations |
| 58 | 10.9 Alternative analysis methods 10.9.1 Ultimate strength analysis 10.9.2 Types of analysis 11 Long-term applications 11.1 Applicability 11.2 Assessment data |
| 59 | 11.3 Special requirements 11.3.1 Fatigue assessment 11.3.2 Weight control 11.3.3 Corrosion protection 11.3.4 Marine growth 11.3.5 Foundations |
| 60 | 11.4 Survey requirements 12 Structural strength 12.1 Applicability 12.1.1 General 12.1.2 Truss type legs |
| 61 | 12.1.3 Other leg types 12.1.4 Fixation system and/or elevating system 12.1.5 Spudcan strength including connection to the leg 12.1.6 Overview of the assessment procedure 12.2 Classification of member cross-sections 12.2.1 Member types 12.2.2 Material yield strength 12.2.3 Classification definitions |
| 62 | 12.3 Section properties of non-circular prismatic members 12.3.1 General 12.3.2 Plastic and compact sections 12.3.3 Semi-compact sections |
| 63 | 12.3.4 Slender sections 12.3.5 Cross-section properties for the assessment 12.4 Effects of axial force on bending moment 12.5 Strength of tubular members 12.6 Strength of non-circular prismatic members 12.7 Assessment of joints |
| 64 | 13 Acceptance criteria 13.1 Applicability 13.1.1 General 13.1.2 Ultimate limit states 13.1.3 Serviceability and accidental limit states |
| 65 | 13.1.4 Fatigue limit states 13.2 General formulation of the assessment check 13.3 Leg strength assessment |
| 66 | 13.4 Spudcan strength assessment 13.5 Holding system strength assessment 13.6 Hull elevation assessment 13.7 Leg length reserve assessment |
| 67 | 13.8 Overturning stability assessment 13.9 Foundation integrity assessment 13.9.1 Foundation capacity check |
| 68 | 13.9.2 Displacement check 13.10 Interaction with adjacent infrastructure |
| 69 | 13.11 Temperatures |
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