Suc Brasil 2012 : Sesam for SURF

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Presentation of Sesam modules for SURF (subsea, umbilcals, risers, flowlines), delivered by Joe Zhang from DNV at SUC.

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Suc Brasil 2012 : Sesam for SURF

  1. 1. SesamSesam for Subsea Umbilicals Risers Flowlines (SURF)Ole Jan Nekstad, Product Director Sesam3 December 2012
  2. 2. SURF - Subsea Umbilicals Risers Flowlines Umbilicals – Multi-purpose service lines Flexible riser Flowlines & pipelines Subsea installationSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 2
  3. 3. Sesam coverage of SURF Subsea - Sesam GeniE & Usfos for structural analysis - Sesam Marine for marine operations Umbilicals and flexible risers - Sesam DeepC for global analysis (ULS & FLS) - UmbiliCAD for drawing & cross section design - Helica for cross section stress and fatigue analysis - Vivana for VIV analysis Risers - Sesam DeepC for riser design - Vivana for VIV analysis Flowlines and pipelines - FatFree for free-span calculations according to DNV RP-F105 - StableLines for pipeline on-bottom stability according to DNV RP-F109 - DNV-OS-F101 Code Compliance for submarine pipeline systems - PET (Pipeline Engineering Tool) for early phase pipeline assessment - Vivana for VIV analysisSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 3
  4. 4. Subsea coverageSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 4
  5. 5. Subsea coverage Structural analysis (ULS, FLS, ALS) - Linear structural analysis - Sesam GeniE product line - Code checks well equipped to cater for the hydrodynamic pressures - Accidental (non-linear) analysis - Usfos: Bottom impact, dropped objects, explosions, fish trawlers….. - Sima: Pipeline installations Marine operations - Sima for lifting & transportation - Manifold or subsea structure lowering….Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 5
  6. 6. Umbilical coverage - Component design - Cross section analysis - ULS analysis (100 year scenario) - Fatigue analysis - VIVSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 6
  7. 7. Umbilicals – characterized by their flexibility Power cable/umbilical Steel tube umbilical Control umbilicalSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 7
  8. 8. Umbilicals - UmbiliCAD A tailor-made drawing and cross section design tool - It will help you make drawings and capacity curves Drawings within hours in stead of days - no need to be a skilled draftsman Early cross section analysis – first results within hours in stead of days - Linear analysis with no stick/slip UmbiliCAD is developed by UltraDeep and marketed by DNVS Capacity Curve Parameter Valu e Un it 1200 100% Utilisation Outer Diameter 1 33 .2 [mm] 1100 80% Utilisation Mass Emp ty 3 5.9 [k g/m] 1000 Mass Filled 3 9.4 [k g/m] 900 Mass Filled And Flo od ed 4 2.4 [k g/m] 800 Sub merged Weigh t Emp ty 2 1.6 [k gf/m] Tension [kN] 700 Sub merged Weigh t Filled 2 5.1 [k gf/m] Sub merged Weigh t Filled An d Flo od ed 2 8.1 [k gf/m] 600 Specific Weig ht Ratio 3 .0 [-] 500 Sub m. Weigh t. Dia. Ratio 2 10 .8 [k gf/m^2 ] 400 Axial Stiffness 6 77 .3 [MN] 300 Ben din g Stiffness 2 1.3 [k Nm^2 ] 200 Ben din g Stiffness (frictio n free) 1 6.7 [k Nm^2 ] 100 Torsion Stiffness 2 7.5 [k Nm^2 ] 0.0 Ten sion /Torsion Facto r 0 .00 [d eg/m/k N] 0.0 0.04 0.08 0.12 0.16 0.2 0.24 0.28 Curvature [1/m]Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 8
  9. 9. Umbilicals - Helica Cross-sectional load sharing analysis - Load-sharing between elements considering axis-symmetric analysis - Cross-sectional stiffness properties from UmbiliCAD (axial, torsional and bending stiffness) - Helix element bending performance analysis to describe stresses in helix elements during bending considering stick/slip behaviour due to interlayer frictional forces Short-term fatigue analysis - To assess the fatigue damage in a stationary short-term environmental condition considering fatigue loading in terms of time-series of simultaneous bi-axial curvature and effective tension produced by global dynamic response analysis - Helica uses results from Sesam DeepC as the response database for time domain global dynamic analysis as loading Long-term fatigue analysis - To assess the long-term fatigue damage by accumulation of all short-term conditions vr vx vθSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 9
  10. 10. Design of umbilicals – a typical process UmbiliCAD, Helica, Sesam DeepC Parameter Valu e Unit Ou ter Diameter 13 3 .2 [mm] Mass Empty 35 .9 [k g/m] Mass Filled 39 .4 [k g/m] Mass Filled And Floo d ed 42 .4 [k g/m] Su b merged Weig ht Empty 21 .6 [k gf/m] Su b merged Weig ht Filled 25 .1 [k gf/m] Su b merged Weig ht Filled And Floo d ed 28 .1 [k gf/m] Sp ecific Weig ht Ratio 3.0 [-] Su b m. Weig h t. Dia. Ratio 21 0 .8 [k gf/m^2 ] Ax ial Stiffn ess 67 7 .3 [MN] Ben din g Stiffness 21 .3 [k Nm^2] Ben din g Stiffness (friction free) 16 .7 [k Nm^2] To rsio n Stiffness 27 .5 [k Nm^2] Ten sio n /To rsion Facto r 0.0 0 [d eg /m/k N]Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 10
  11. 11. Why UmbiliCAD and Helica? It is quick and simple to design and draw umbilical cross-sections with UmbiliCAD The Helica cross-section model is automatically generated by UmbiliCAD (mass & stiffness) Automatic generation of capacity curves (linear & with stick/slip) Consistently handling the internal friction in fatigue calculations Very high numerical performanceSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 11
  12. 12. Riser coverage, based on results from - a global coupled analysis - a refined approach using results from global coupled analysis or known displacements (time-series) - vortex induced vibrationsSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 12
  13. 13. Riser configurations handled by Sesam DeepC Configuration according to principle for compensation of floater motions Compliant/flexible risers - Floater motions absorbed by change in configuration geometry Hybrid risers - Free standing vertical riser column de-coupled from dynamic floater motions by means of compliant jumpers Top tension/vertical risers - Vertical risers supported by top tension. Heave compensators allowing for relative riser/floater heave motionSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 13
  14. 14. Types of analysis covered ULS - Deflections, forces, stresses and code check results - Sesam DeepC (Simo + Riflex) FLS - Global and refined fatigue - Sesam DeepC (Simo + Riflex) VIV - Response frequencies and fatigue damage - Cross-flow and in-line - VivanaSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 14
  15. 15. VIV - Vivana Vivana is developed by Marintek and NTNU and marketed by DNVS Closely related to Riflex which is part of Sesam DeepC The fluid structure interaction is described by empirical, coefficient based models Finite element method is used to model the structure Marintek tests for Norsk HydroSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 15
  16. 16. VIV – Vivana, analysis types Static and dynamic analysis - Uses the model and static analysis from Sesam DeepC (Riflex) Pure IL Combined - Finite element method response IL and CF - Non-constant properties; e.g. diameter, stiffness - Sheared current - Uneven seafloor - 3D response; sag and current deflection included VIV analysis - Frequency domain - Discrete response frequencies - Response frequencies are assumed to be eigen-frequencies found with adjusted added mass - VIV loads from semi-empirical coefficient based models - Cross-Flow (CF) VIV excitation only - In-Line (IL) VIV excitation onlySesam3 December 2012© Det Norske Veritas AS. All rights reserved. 16
  17. 17. Pipeline design based on the DNV standards - FatFree, RP-F105 - StableLines, RP-F109 - Code compliance, OS-F101 - PET (Pipeline Engineering Tool)Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 17
  18. 18. Free span analysis – to avoid VIV and fatigue problems Avoid costly repair Predict stable delivery of oil or gas Prevent pollution Avoid seabed correction and span intervention Rule based (DNV) or VIV analysis (Vivana) Free spans Uneven Free span with Scour seabed span interventionSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 18
  19. 19. Analyse before you install Typical example on fatigue damage of pipelineSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 19
  20. 20. FatFree, RP-F105Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 20
  21. 21. Pipeline free spans Free spans can cause problems and must be taken seriously The problem is fatigue which is caused by cyclic loads from VIV VIV is a classic fluid-structure interaction problem and the response is caused by resonance between the vortex shedding frequency and the natural frequency of the span. Fatigue damage for a given span under defined environmental conditions can be calculated by FatFree, which is based on RP-F105Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 21
  22. 22. Failure Modes Fatigue Limit State Ultimate Limit State .. accumulated damage from stress cycles .. over-stress (local buckling) due to: caused by: Static Bending (weight & current) (DNV OS-F101) Vortex Induced Vibrations (in-line & cross-flow) (RP-F105) VIV & Wave Loads (RP-F105) Direct Wave Loads (RP-F105) Pressure Effects (DNV OS-F101) Axial Force (DNV OS-F101) Trawl interference (GL 13)Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 22
  23. 23. FatFree, based on DNV-RP-F105 UPDATE SHEET OPTIONS 12.06.2006 Programmed by DNV Deep Water Technology CALCULATE USER HELP FATFREE Vers. 10.0 Kim Mørk (Kim.Mork@dnv.com ) FATIGUE ANALYSIS OF FREE SPANNING PIPELINES Olav Fyrileiv (Olav.Fyrileiv@dnv.com) SPAN RUNS PRINT RESULTS DNV version Expiry date: 31.12.2007 Release Note Muthu Chezhian (Muthu.Chezhian@dnv.com) FATFREE IS READY Project: Date: 12.06.2006 Calculations by No Wave Case References: verification of version Verified by Calculation options Code Free Span Scenario Response Data Soil Properties SN-Curves Safety Factors Single-mode RP-F105 Flat sea-bed RP-F105 Span User Defined F1 (free corrosion) User Defined Return Period Values Directionality h [m] 300 fo(in-line) 0,773 ζstruc 0,000 m1 3 Well defined Automatic Generated Discrete - C dir. L [m] 40 fo(cr-flow) 0,798 ζsoil (in-line) 0,000 m2 3 η 1,00 Current Modelling Current Sheet Name e [m] 2,69 Ain (in-line) 446 ζsoil (cr-flow) 0,000 Log(C1) 11,222 γk 1,00 Uc Histogram Current d [m] 0 Acr (cr-flow) 461 ζh,RM 0,000 Log(C2) 11,222 γf,IL(inline) 1,00 Damage distribution vs direction θpipe 0,0 λmax 940 KS(in-line) 0,00 logNsw 8,00 γf,CF(cr-flow) 1,00 D [m] 0,612 δ/D 0,24 KS(cr-flow) 0,00 S0 [MPa] 0,00 γS 1,001,2 RM (In-Line)1,0 FM (In-Line) L/D 65 Seff/PE -0,23 KV 2,105E+07 SCF 1,00 γon,IL 1,10 Cross-Flow0,8 Comb.(In-Line) Wave Modelling Wave Sheet Name KL 1,592E+07 γon,CF 1,000,6 No Wave Wave-template KV,S 5,300E+05 ΨR 1,000,4 STRUCTURAL MODELLING0,2 Coating data Functional Loads Pipe Dimensions [m] Constants Densities [kg/m3]0,0 kc 0,33 Heff [N] 2,00E+05 Ds 0,5000 ν 0,30 ρsteel 7850 θ 0 20 40 60 80 100 fcn (MPa) 45 p [bar] 105 tsteel 0,0132 α [oC-1] 1,17E-05 ρconcrete 2240 ∆T [oC] 0 tconcrete 0,0500 E [N/m2] 2,07E+11 ρcoating 1300 pdf for omnidirectional current tcoating 0,0060 CD(current) 1,00 ρcont 1535,0 RM(cross-flow)*4 RESULTS4,0 RM(inline)*10 FATIGUE LIFE DYNAMIC STRESS [MPa]3,0 In-line (Response Model) 1,09E+03 yrs Cross-flow Inline2,0 Cross-Flow 1,00E+06 yrs Peak Von Mises Peak Von Mises1,0 σx(1 year) 0,0 158,2 σx(1 year) 7,2 135,20,0 velocity In-line (Force Model) - yrs σx(10 year) 0,0 158,2 σx(10 year) 16,7 141,4 0,0 0,2 0,4 0,6 0,8 1,0 In-line (Combined) - yrs σx(100 year) 0,0 158,2 σx(100 year) 26,1 148,6Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 23
  24. 24. StableLines, RP-F109Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 24
  25. 25. StableLines based on DNV-RP-F109 (2007) Making safe decisions on necessary weight simpler Three lateral stability methods are covered; - Absolute stability, No pipeline movement - Generalized stability with 0.5xOD or 10xOD displacement Any parameter may be varied, to help designers create good criteria for the relevant conditions of their projects. Important sensitivity studies are performed and reported automatically Pipelines and umbilicals on the seabed are influenced by hydrodynamic forces generated by waves and currents The only resisting forces are due to Fcurrent seabed interaction Fwaves Fhydrodynamic > Fsoil resistance = Unstable pipeline FRSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 25
  26. 26. Soil conditions Clay - Friction coefficient set to µ = 0.2 - Pipe penetration automatically calculated - Sensitive to undrained shear strength, su Sand - Friction coefficient set to µ = 0.6 - Pipe penetration automatically calculated - Insensitive to submerged unit soil weight, γs’ Rock - Friction coefficient set to µ = 0.6 - Pipe penetration = 0Sesam3 December 2012© Det Norske Veritas AS. All rights reserved.
  27. 27. Metocean/Environmental data Waves - Based on observation of the waves in the area of the pipeline - Scatter diagram used to derive statistical wave models. - Most important statistical values: - Significant wave height, Hs - Peak period, Tp - Surface waves transferred down to the seabed by a transfer function - Oscillating water particle velocity Current - Usually assumed to be constant for a given RPV - Constant current speed (water particle velocity) given RPV - Return Period Value - 1, 10 or 100 year stormSesam3 December 2012© Det Norske Veritas AS. All rights reserved.
  28. 28. StableLines – easy to making safe and good decisions Sensitivities to the most critical design parameters are presented in curves, which allow the designer to assess the implications of inaccuracies with ease Easy to understand curves for good decision making on important design choices Concrete thickness vs. Water depth 0.12 0.1 Concrete thickness [m] 0.08 0.06 Empty condition Operational 0.04 condition 0.02 0 -0.02 40 50 60 70 80 90 100 Water depth [m]Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 28
  29. 29. StableLines - OutputSesam3 December 2012© Det Norske Veritas AS. All rights reserved.
  30. 30. Code compliance, OS-F101Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 30
  31. 31. Scenarios and failure modes Propagating Ovalisation Scenario Ratcheting Combined Collapse Fracture Bursting buckling Loading Fatigue Dent Pressure X X X X Installation X X X X X X X Free-span (x) X X Global Buckling (x) X X X X Trawling (x) X X X On bottom (x) X X X X X stability Pipeline Walking X X X XSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 31
  32. 32. DNV OS-F101 Code compliance with DNV OS-F101 Supported code checks - Burst (pressure containment) related to both system test condition and operation - Collapse for an empty pipeline - Propagating buckling for an empty pipeline - Load controlled load interaction (moment, axial force and external/internal overpressure) - Displacement controlled load interaction (axial strain and external/internal overpressure) The program calculates - The minimum required wall thickness for the given conditions - Utilisation based on a wall thickness given by the userSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 32
  33. 33. DNV OS-F101 – Easy to use and easy to understand All input at a glance & Output in engineering termsSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 33
  34. 34. PET (Pipeline Engineering Tool) – or (Pipeline EarlyDesign Tool)Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. 34
  35. 35. PET – Pipeline Engineering Tool PET – a calculation tool for early phase pipeline assessment - DNV-OS-F101 Design Checks - Weight and Volume - End Expansion - Upheaval Buckling - On-Bottom Stability - Fatigue Screening - Reel Straining - Reel Packing - J-Lay - S-Lay - Cathodic Protection FatFree, StableLines, DNV OS-F101 are used for more thorough studiesSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 35
  36. 36. PET – Weight and Volume Calculates volume, mass and dry weight of the components that constitute a pipeline, i.e. steel, coating layers and content. Volume, mass and dry weight are calculated individually and totally, per metre pipeline and totally for a given length of the pipeline.Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 36
  37. 37. PET – End Expansion A pipeline with internal pressure and temperature increase will want to expand axially Pipe soil interaction will reduce/prevent axial expansion Effective axial force increases Maximum effective axial from zero to force, no axial expansion maximum due to soil resistance Free end will expand Anchor length Soil resistanceSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 37
  38. 38. PET – End Expansion Report – print to paper or *.pdfSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 38
  39. 39. PET – Upheaval Buckling Safety level for given input Temperature, internal pressure and imperfection height that will trigger upheaval buckling Cover height to prevent upheaval buckling for a given safety level Simple and approximate, not necessarily conservativeSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 39
  40. 40. PET – On-Bottom Stability Safety level for given input Weight coating required to ensure stability for a given safety level and Steel wall thickness required to ensure stability for a given safety level. Calculations according to DNV-RP-E305Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 40
  41. 41. PET – Fatigue Screening Critical span length according to VIV on-set screening criterion in DNV-RP-F105 In-line Cross-flowSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 41
  42. 42. PET – Reel Straining Installation by reeling: What is the maximum strain and ovality on the reel? Is the criterion in DNV-OS-F101 satisfied? How much plastic strain accumulates?Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 42
  43. 43. PET – Reel Packing Amount of pipe on given reel according to - Volume restriction and - Weight restrictionSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 43
  44. 44. PET – J-Lay (also applicable for reeling)Sesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 44
  45. 45. PET – J-Lay Calculates: Top tension Curvature and moment in sag bend including utilisation ratio according to DNV-OS-F101 Distance from touch down to barge Length of pipe in the free span Minimum horizontal lay radius Note: Catenary calculations, i.e. approximateSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 45
  46. 46. PET – S-LaySesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 46
  47. 47. PET – S-Lay Calculates: Top tension Strain on stinger including utilisation ration according to DNV-OS-F101 Curvature and moment in sag bend including utilisation ratio according to DNV-OS-F101 Distance from touch down to barge Length of pipe in the free span Minimum horizontal lay radius Catenary calculations, i.e. approximateSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 47
  48. 48. PET – Cathodic Protection Calculated anode requirement according to DNV-RP-F103 to ensure: - sufficient anode material to cover mean loss throughout the design life. - sufficient current at the end of design life for de-polarisation. - maximum spacingSesam3 December 2012© Det Norske Veritas AS. All rights reserved. Slide 48
  49. 49. Sesam has a high coverage for - Subsea - Umbilicals - Risers - Flow and pipelinesSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 49
  50. 50. Concluding remarks Pipeline engineering tools Structural analysis & according to DNV practices marine operations Global analysis, cross section design, fatigue and VIV Strength assessments, fatigue and VIVSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 50
  51. 51. Safeguarding life, property and the environment www.dnv.comSesam3 December 2012© Det Norske Veritas AS. All rights reserved. 51

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