Finite Element Analysis of seawater intake hoses Danyi Antal, Domonkos Imre, Bétéri Gyula, Dr. Katona Tamás Simday 2012, Budapest
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Members of Oil & Marine Dunlop Oil & Marine Ltd Grimsby / Ashington UK Eddelbüttel + Schneider Hamburg Germany ContiTech Rubber Industrial Ltd Szeged Hungary ContiTech Beattie Corp. Houston USA ContiTech Oil & Marine Singapore
Flexible hoses for offshore application - rotary/cement - choke & kill - well test - BOP control - utility Supply hoses Crude oil offloading Production hoses Seawater Intake System Sub-sea production hoses
Floating low pressure oil hose in service
Production hose in service
Flexible hoses for offshore application - rotary/cement - choke & kill - well test - BOP control - utility Supply hoses Crude oil offloading Production hoses Seawater Intake System Sub-sea production hoses
8 Extreme size of dredge hose
9 Vessel model with seawater intake hose lines
10 Needed to answer by modeling Check the minimal bend radii in case of 100 year weather conditions Define the utilization of the structural parts Life time calculation The used tools Concentrate parametric modeling OrcaFlex software Distributed parametric modeling Marc Mentat softwares
11 Subtasks Bend stiffness Modeling of the bending test process to define the bend stiffness Vessel and hose motions Vessel main particulars (sizes, LCG-VCG, RAO, mooring sys.) and environmental conditions are given The hose motions are modeled and the reaction forces are post-processed Stress distribution Define the maximal stress values and utilization factors in the structural parts in case of extreme load cases Define the stress loading factors Fatigue life prediction Fatigue damage is cumulated using SLF, weather conditions and S-N curves
12 Subtasks solved by Marc Mentat Bend stiffness Modeling of the bending test process to define the bend stiffness Vessel and hose motions Vessel main particulars (sizes, LCG-VCG, RAO, mooring system) and environmental conditions are given The hose motions are modeled and the reaction forces are post-processed Stress distribution Define the maximal stress values and utilization factors in the structural parts in case of extreme load cases Define the stress loading factors (SLF) Fatigue life prediction Fatigue damage is cumulated using SLF, weather conditions and S-N curves
13 Subtasks solved by Marc Mentat Bend stiffness Modeling of the bending test process to define the bend stiffness
14 Typical SWU hose geometry
15 FEM model Axi-symmetric sequence
16 FEM model Axi-symmetric sequence
17 FEM model Rebar elements
18 FEM model Axi-symmetric element types
19 FEM model 3D hose model
20 FEM model 3D flange and bumper model
21 Bending test process based on GOMPHOM (OCIMF) standard Guide to Manufacturing and Purchasing Hoses for Offshore Mooring, 2009, Section 2, Ch.2.1.7
22 Bending test process based on GOMPHOM (OCIMF) standard Guide to Manufacturing and Purchasing Hoses for Offshore Mooring, 2009, Section 2, Ch.2.1.7
23 FEM model Boundary conditions
24 Results Deformed shape
25 Results Deformed shape
26 Curvature [1/m] IxE [knm2] Results Bend stiffness Curvature Bend stiffness 0.3500 0.3000 hose body flange 350 300 hose body flange 0.2500 bumper 250 bumper 0.2000 200 Iso-moment lines 0.1500 150 0.1000 100 0.0500 50 0.0000 0 5 10 15 20 25 30 35 Bend moment [knm] 0 0.00 0.10 0.20 0.30 0.40 Curvature [1/m]
27 IxE [kgm2] Validation 50000 45000 40000 Measured and simulated bend stiffness values Measured Simulated 35000 30000 25000 20000 15000 10000 5000 0 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 R k 3 Third power of mean radii [m 3 ]
28 Subtasks Vessel and hose motions Vessel main particulars (sizes, LCG-VCG, RAO, mooring system) and environmental conditions are given The hose motions are modeled and the reaction forces are post-processed
29 Vessel motions
30 Curvature along the hose length
31 Subtasks Stress distribution Define the maximal stress values and utilization factors in the structural parts in case of extreme load cases Define the stress loading factors (SLF)
32 Axi-symmetric FEM model of flange
33 Axi-symmetric FEM model of flange BC s
34 Results
35 Results
36 Results
37 Results 0.4 0.372 Utilization of components 0.3 0.2 0.179 0.166 0.1 0.056 0.069 0 0.015 Textile cord Rubber Vorplate Lamella Flange Ring
38 Results Stress Loading Factors 50 40 Tension Bending 30 20 10 0 Steel plate Lamella Flange Ring in neck Ring in bumper Ring in body
39 Subtasks Fatigue life prediction Fatigue damage is cumulated using SLF, weather conditions and S-N curves
40 Thank you for your attention