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

1. Sesam
Sesam for Subsea Umbilicals Risers Flowlines (SURF)
Ole Jan Nekstad, Product Director Sesam
3 December 2012

2. SURF - Subsea Umbilicals Risers Flowlines
Umbilicals – Multi-purpose service lines
Flexible riser
Flowlines & pipelines
Subsea installation
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 2

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 analysis
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 3

4. Subsea coverage
Sesam
3 December 2012
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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….
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 5

6. Umbilical coverage
- Component design
- Cross section analysis
- ULS analysis (100 year scenario)
- Fatigue analysis
- VIV
Sesam
3 December 2012
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7. Umbilicals – characterized by their flexibility
Power cable/umbilical Steel tube umbilical Control umbilical
Sesam
3 December 2012
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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]
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 8

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 vθ
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 9

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]
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 10

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 performance
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 11

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 vibrations
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 12

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 motion
Sesam
3 December 2012
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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
- Vivana
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 14

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 Hydro
Sesam
3 December 2012
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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 only
Sesam
3 December 2012
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17. Pipeline design based on the
DNV standards
- FatFree, RP-F105
- StableLines, RP-F109
- Code compliance, OS-F101
- PET (Pipeline Engineering Tool)
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 17

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 intervention
Sesam
3 December 2012
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19. Analyse before you install
Typical example on fatigue damage of pipeline
Sesam
3 December 2012
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20. FatFree, RP-F105
Sesam
3 December 2012
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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-F105
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 21

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)
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 22

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 1,00
1,2
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-Flow
0,8 Comb.(In-Line) Wave Modelling Wave Sheet Name KL 1,592E+07 γon,CF 1,00
0,6 No Wave Wave-template KV,S 5,300E+05 ΨR 1,00
0,4 STRUCTURAL MODELLING
0,2 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 153
5,0
RM(cross-flow)*4 RESULTS
4,0
RM(inline)*10 FATIGUE LIFE DYNAMIC STRESS [MPa]
3,0
In-line (Response Model) 1,09E+03 yrs Cross-flow Inline
2,0
Cross-Flow 1,00E+06 yrs Peak Von Mises Peak Von Mises
1,0 σx(1 year) 0,0 158,2 σx(1 year) 7,2 135,2
0,0 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) 26,1 148,6
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 23

24. StableLines, RP-F109
Sesam
3 December 2012
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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
FR
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 25

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 = 0
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved.

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 storm
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved.

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]
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 28

29. StableLines - Output
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved.

30. Code compliance, OS-F101
Sesam
3 December 2012
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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 X
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 31

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 user
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 32

33. DNV OS-F101 – Easy to use and easy to understand
All input at a glance & Output in engineering terms
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 33

34. PET (Pipeline Engineering Tool) – or
(Pipeline EarlyDesign Tool)
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 34

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 studies
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 35

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.
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 36

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 resistance
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 37

38. PET – End Expansion
Report – print to paper or *.pdf
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 38

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 conservative
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 39

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-E305
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 40

41. PET – Fatigue Screening
Critical span length according to
VIV on-set screening criterion in
DNV-RP-F105
In-line
Cross-flow
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 41

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?
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 42

43. PET – Reel Packing
Amount of pipe on given reel
according to
- Volume restriction and
- Weight restriction
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 43

44. PET – J-Lay (also applicable for reeling)
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 44

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.
approximate
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 45

46. PET – S-Lay
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 46

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. approximate
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 47

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 spacing
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. Slide 48

49. Sesam has a high coverage for
- Subsea
- Umbilicals
- Risers
- Flow and pipelines
Sesam
3 December 2012
© Det Norske Veritas AS. All rights reserved. 49

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 VIV
Sesam
3 December 2012
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51. Safeguarding life, property
and the environment
www.dnv.com
Sesam
3 December 2012
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