PREN ISO 19905-1 : DRAFT 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms and symbols
   4.1 Abbreviated terms
   4.2 Symbols used in Clause 8
   4.3 Symbols used in Clause 9
   4.4 Symbols used in Clause 10
   4.5 Symbols used in Clause 12
   4.6 Symbols used in Clause 13
5 Overall considerations
   5.1 General
   5.2 Assessment approach
   5.3 Selection of limit states
   5.4 Determination of assessment situations
   5.5 Exposure levels
   5.6 Analytical tools
6 Data to be assembled for each site
   6.1 Applicability
   6.2 Rig data
   6.3 Site data
   6.4 Metocean data
   6.5 Geophysical and geotechnical data
   6.6 Earthquake data
7 Actions
   7.1 Applicability
   7.2 General
   7.3 Metocean actions
   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
   8.3 Modelling the leg
   8.4 Modelling the hull
   8.5 Modelling the leg/hull connection
   8.6 Modelling the spudcan and foundation
   8.7 Mass modelling
   8.8 Application of actions
9 Foundations
   9.1 Applicability
   9.2 General
   9.3 Geotechnical analysis of independent leg foundations
   9.4 Other considerations
10 Structural response
   10.1 Applicability
   10.2 General considerations
   10.3 Types of analyses and associated methods
   10.4 Common parameters
   10.5 Storm analysis
   10.6 Fatigue
   10.7 Earthquake
   10.8 Accidental situations
   10.9 Alternative analysis methods
11 Long-term applications
   11.1 Applicability
   11.2 Assessment data
   11.3 Special requirements
   11.4 Survey requirements
12 Structural strength
   12.1 Applicability
   12.2 Classification of member cross-sections
   12.3 Section properties
   12.4 Effects of axial force on bending moment
   12.5 Strength of tubular members
   12.6 Strength of prismatic members
   12.7 Assessment of joints
13 Acceptance criteria
   13.1 Applicability
   13.2 General formulation
   13.3 Leg strength
   13.4 Spudcan strength
   13.5 Holding system strength
   13.6 Hull elevation
   13.7 Leg length reserve
   13.8 Overturning stability
   13.9 Foundation Integrity
   13.10 Temperatures
Annex A (informative) - Recommendations and information
   A.1 Scope
   A.2 Normative references
   A.3 Terms and definitions
   A.4 Symbols
   A.5 Overall considerations
   A.6 Data to be assembled for each site
   A.7 Actions
   A.8 Structural modelling
   A.9 Foundations
   A.10 Structural response
   A.11 Long-term applications
   A.12 Structural strength
   A.13 Acceptance checks
Annex B (normative) - Summary of partial action and
        resistance factors
Annex C (informative) - Structural modelling and response
        analysis - additional information
   C.1 Guidance on 8.5: Modelling the leg/hull
         connections
   C.2 Guidance on A.10.4.2.1: General
   C.3 Guidance on A.10.4.2.4: Variability in natural period
   C.4 Guidance on A.10.4.3.3: SDOF hysteretic damping
   C.5 Guidance on A.10.5.3.2: Methods for determining
         the MPME
Annex D (informative) - Foundations: Recommendations for the
        acquisition of site specific geotechnical data
   D.1 Recommendations for the acquisition of
         site specific geotechnical data
Annex E (informative) - Foundations: Additional information
        and alternative approaches
   E.1 Guidance on A.9.3.2.3: Penetration in clays - bearing
         capacity factors of Houlsby and Martin
   E.2 Guidance on A.9.3.2.4: Penetration in silica sands
   E.3 Guidance on A. 9.3.2.7.4: Punch-through on: Sand
         overlying clay: further details on alternate methods
Annex F (informative) - Informative annex on A.12: Structural
        strength
   F.1 Guidance on A.12.6.2.4: Axial compressive column
         buckling strength
   F.2 Guidance on A.12.6.3.2: The interaction equation
         approach - determination of eta
   F.3 Guidance on A.12.6.3.3: The interaction surface approach
Annex G (informative) - Contents list for typical site assessment
        report
   G.1 General
   G.2 Jack-up and location:
   G.3 Data check:
   G.4 Site assessment results summary
   G.5 Jack-up data:
   G.7 Arrangements at location
   G.9 Metocean conditions
   G.11 Site investigation
   G.12 Site hazards
   G.13 Soils
   G.14 Analysis path/route/assumptions
   G.16 Spudcan fixity used in analysis
   G.18 Earthquake analysis
   G.19 Accidental situations
   G.20 Intermediate results
   G.21 Analysis results (utilisation checks)
Bibliography

Describes requirements and guidance for the site-specific assessment of independent leg jack-up units for use in the petroleum and natural gas industries.