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BS EN ISO 19905-1:2016

BS EN ISO 19905-1:2016

$215.11

Petroleum and natural gas industries. Site-specific assessment of mobile offshore units – Jack-ups

Published By Publication Date Number of Pages
BSI 2016 334
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PDF Catalog

PDF Pages PDF Title
4 European Foreword
11 1 Scope
12 2 Normative references
3 Terms and definitions
23 4 Symbols and abbreviated terms
4.1 Symbols
25 4.2 Abbreviated terms
26 5 Overall considerations
5.1 General
5.1.1 Competency
5.1.2 Planning
5.1.3 Assessment situations and associated criteria
5.1.4 Reporting
5.1.5 Regulations
5.2 Assessment approach
29 5.3 Selection of limit states
30 5.4 Determination of assessment situations
5.4.1 General
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
31 5.4.6 Leg length reserve
5.4.7 Adjacent structures
5.4.8 Other
5.5 Exposure levels
5.5.1 General
5.5.2 Life-safety categories
32 5.5.3 Consequence categories
34 5.5.4 Determination of exposure level
35 5.6 Analytical tools
6 Data to assemble for each site
6.1 Applicability
6.2 Jack-up data
6.3 Site and operational data
36 6.4 Metocean data
37 6.5 Geophysical and geotechnical data
6.6 Earthquake data
7 Actions
7.1 Applicability
38 7.2 General
7.3 Metocean actions
7.3.1 General
7.3.2 Hydrodynamic model
7.3.3 Wave and current actions
39 7.3.4 Wind actions
7.4 Functional actions
7.5 Displacement dependent effects
7.6 Dynamic effects
7.7 Earthquakes
7.8 Other actions
40 8 Structural modelling
8.1 Applicability
8.2 Overall considerations
8.2.1 General
8.2.2 Modelling philosophy
8.2.3 Levels of FE modelling
41 8.3 Modelling the leg
8.3.1 General
8.3.2 Detailed leg
8.3.3 Equivalent leg (stick model)
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
42 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
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
43 8.6.2 Seabed reaction point
8.6.3 Foundation modelling
8.7 Mass modelling
44 8.8 Application of actions
8.8.1 Assessment actions
8.8.1.1 General
8.8.1.2 Two-stage deterministic storm analysis
45 8.8.1.3 Stochastic storm analysis
8.8.1.4 Earthquake analysis
8.8.2 Functional actions due to fixed load and variable load
46 8.8.3 Hull sagging
8.8.4 Metocean actions
8.8.5 Inertial actions
8.8.6 Large displacement effects
8.8.7 Conductor actions
8.8.8 Earthquake actions
47 9 Foundations
9.1 Applicability
9.2 General
9.3 Geotechnical analysis of independent leg foundations
9.3.1 Foundation modelling and assessment
48 9.3.2 Leg penetration during preloading
9.3.3 Yield interaction
49 9.3.4 Foundation stiffnesses
9.3.5 Vertical-horizontal foundation capacity envelopes
9.3.6 Acceptance checks
51 9.4 Other considerations
9.4.1 Skirted spudcans
9.4.2 Hard sloping strata
9.4.3 Footprint considerations
9.4.4 Leaning instability
52 9.4.5 Leg extraction difficulties
9.4.6 Cyclic mobility
9.4.7 Scour
9.4.8 Spudcan interaction with adjacent infrastructure
9.4.9 Geohazards
9.4.10 Carbonate material
53 10 Structural response
10.1 Applicability
10.2 General considerations
10.3 Types of analyses and associated methods
54 10.4 Common parameters
10.4.1 General
10.4.2 Natural periods and affecting factors
10.4.2.1 General
10.4.2.2 Stiffness
10.4.2.3 Mass
55 10.4.2.4 Variability in natural period
10.4.2.5 Cancellation and reinforcement
10.4.3 Damping
10.4.4 Foundations
56 10.4.5 Storm excitation
10.5 Storm analysis
10.5.1 General
10.5.2 Two-stage deterministic storm analysis
57 10.5.3 Stochastic storm analysis
58 10.5.4 Initial leg inclination
10.5.5 Limit state checks
10.6 Fatigue analysis
10.7 Earthquake analysis
59 10.8 Accidental situations
10.9 Alternative analysis methods
10.9.1 Ultimate strength analysis
60 10.9.2 Types of analysis
11 Long-term applications
11.1 Applicability
11.2 Assessment data
61 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
11.4 Survey requirements
62 12 Structural strength
12.1 Applicability
12.1.1 General
12.1.2 Truss type legs
12.1.3 Other leg types
12.1.4 Fixation system and/or elevating system
63 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
64 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
12.3.4 Slender sections
12.3.5 Cross-section properties for the assessment
65 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
13 Acceptance criteria
13.1 Applicability
13.1.1 General
66 13.1.2 Ultimate limit states
13.1.3 Serviceability and accidental limit states
13.1.4 Fatigue limit states
13.2 General formulation of the assessment check
67 13.3 Leg strength assessment
13.4 Spudcan strength assessment
13.5 Holding system strength assessment
68 13.6 Hull elevation assessment
13.7 Leg length reserve assessment
13.8 Overturning stability assessment
69 13.9 Foundation integrity assessment
13.9.1 Foundation capacity check
70 13.9.2 Displacement check
13.10 Interaction with adjacent infrastructure
13.11 Temperatures

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BS EN ISO 19905-1:2016
$215.11