The document describes a coupled analysis of hose loadings during an offloading operation between a 269m FPSO and 269m DP-Shuttle Tanker connected by a 129.8m offloading hose. The analysis models the vessel motions using SIMO and hose loads using RIFLEX in a coupled simulation under environmental conditions of current, waves, and wind. The modeling process involves importing vessel models into SIMO, setting up the coupled RIFLEX analysis, defining the environment, importing the hose properties, connecting the vessels and hose, and specifying calculation parameters.

1. Coupled analysis of hose loadings in a tandem
offloading operation
Carlos Eduardo Souza – Research Scientist, MARINTEK do Brasil
Rio de Janeiro, 03/12/2012
Norwegian Marine Technology Research Institute

2. Description
• Objective: evaluation of hose loads during an offloading operation
• System description:
− 269 m FPSO (mean load) – catenary mooring system
− 269 m DP-Shuttle Tanker (ballasted)
− 129.8 m offloading hose
• Coupled analysis:
Vessels motions Hose loads
simulated with simulated with
SIMO RIFLEX

3. Description
• Initial vessels positions correspondent to the hose stress free condition
Tanker FPSO
• DP system leads the tanker to the final position

4. Modeling in SIMA environment
1. Import SIMO sys-files for each of the ships
− Catenary moored FPSO
− DP shuttle tanker
2. Create a RIFLEX coupled task
3. Create environment
− Current (Vc = 0.5 m/s, α = 155°)
− Waves (Hs = 2.5 m, Tp = 9.0 s, β = 170°)
− Wind (Vw = 12 m/s, γ = 170º)
4. Import RIFLEX input files
− Cross section, line type and supernodes for the hose
5. Finalize coupled system
− Create supernodes on both vessels CG’s.
− Make hose supernodes slave of the CG supernodes
− Create dummy cross section, dummy line type and dummy lines
− Create AR connection for each ship
6. Calculation parameters

5. Modeling in SIMA environment
1. Import SIMO sys-files for each of the ships
− Catenary moored FPSO
− DP shuttle tanker
2. Create a RIFLEX coupled task
3. Create environment
− Current (Vc = 0.5 m/s, α = 155°)
− Waves (Hs = 2.5 m, Tp = 9.0 s, β = 170°)
− Wind (Vw = 12 m/s, γ = 170º)
4. Import RIFLEX input files
− Cross section, line type and supernodes for the hose
5. Finalize coupled system
− Create supernodes on both vessels CG’s.
− Make hose supernodes slave of the CG supernodes
− Create dummy cross section, dummy line type and dummy lines
− Create AR connection for each ship
6. Calculation parameters

6. Modeling in SIMA environment
1. Import SIMO sys-files for each of the ships
− Catenary moored FPSO
− DP shuttle tanker
2. Create a RIFLEX coupled task
3. Create environment
− Current (Vc = 0.5 m/s, α = 155°)
− Waves (Hs = 2.5 m, Tp = 9.0 s, β = 170°)
− Wind (Vw = 12 m/s, γ = 170º)
4. Import RIFLEX input files
− Cross section, line type and supernodes for the hose
5. Finalize coupled system
− Create supernodes on both vessels CG’s.
− Make hose supernodes slave of the CG supernodes
− Create dummy cross section, dummy line type and dummy lines
− Create AR connection for each ship
6. Calculation parameters

7. Modeling in SIMA environment
1. Import SIMO sys-files for each of the ships
− Catenary moored FPSO
− DP shuttle tanker
2. Create a RIFLEX coupled task
3. Create environment
− Current (Vc = 0.5 m/s, α = 155°)
− Waves (Hs = 2.5 m, Tp = 9.0 s, β = 170°)
− Wind (Vw = 12 m/s, γ = 170º)
4. Import RIFLEX input files
− Cross section, line type and supernodes for the hose
5. Finalize coupled system
− Create supernodes on both vessels CG’s.
− Make hose supernodes slave of the CG supernodes
− Create dummy cross section, dummy line type and dummy lines
− Create AR connection for each ship
6. Calculation parameters

8. Modeling in SIMA environment
1. Import SIMO sys-files for each of the ships
− Catenary moored FPSO
− DP shuttle tanker
2. Create a RIFLEX coupled task
3. Create environment
− Current (Vc = 0.5 m/s, α = 155°)
− Waves (Hs = 2.5 m, Tp = 9.0 s, β = 170°)
− Wind (Vw = 12 m/s, γ = 170º)
4. Import RIFLEX input files
− Cross section, line type and supernodes for the hose
5. Finalize coupled system
− Create supernodes on both vessels CG’s.
− Make hose supernodes slave of the CG supernodes
− Create dummy cross section, dummy line type and dummy lines
− Create AR connection for each ship
6. Calculation parameters

9. Modeling in SIMA environment
1. Import SIMO sys-files for each of the ships
− Catenary moored FPSO
− DP shuttle tanker
2. Create a RIFLEX coupled task
3. Create environment
− Current (Vc = 0.5 m/s, α = 155°)
− Waves (Hs = 2.5 m, Tp = 9.0 s, β = 170°)
− Wind (Vw = 12 m/s, γ = 170º)
4. Import RIFLEX input files
− Cross section, line type and supernodes for the hose
5. Finalize coupled system
− Create supernodes on both vessels CG’s.
− Make hose supernodes slave of the CG supernodes
− Create dummy cross section, dummy line type and dummy lines
− Create AR connection for each ship
6. Calculation parameters

10. Thank you!
Carlos.Souza@marintek.com.br