| name | orcaflex-jumper-analysis |
| version | 1.0.0 |
| category | engineering |
| description | Rigid and flexible jumper modelling in OrcaFlex covering installation analysis, in-place analysis, VIV screening, and fatigue assessment. |
| type | reference |
| invocation | /orcaflex-jumper-analysis |
| applies-to | ["Codex","codex","gemini"] |
| auto_generated | true |
| source | incoming/digitalmodel/orcaflex-jumper-analysis |
| promoted | "2026-02-18T00:00:00.000Z" |
| capabilities | [] |
| requires | [] |
| see_also | [] |
| tags | [] |
OrcaFlex Jumper Analysis Skill
Description
Rigid and flexible jumper modelling in OrcaFlex — covers installation analysis (crane lift, lowering, landing), in-place analysis (VIV, fatigue, extreme response), and parametric studies across environmental headings and sea states.
When to Use
- Jumper installation analysis (SZ/DZ, AHC on/off)
- Rigid jumper stress analysis and VIV screening
- Flexible jumper fatigue assessment
- Multi-section pipe modelling with buoyancy modules
- Three-point lift rigging design
- Parametric heading/sea-state studies
Key Concepts
Multi-Section Pipe
- Jumpers typically have 15-25 OrcaFlex line sections with alternating line types
- Line types: bare coated pipe, buoyancy modules, strake sections, insulation
- Each section has distinct OD, wall thickness, mass, and bending stiffness
- Section lengths vary: short connector sections (1-2m) to long pipe runs (50-100m)
M-Shape Buoyancy Layout
- Mid-span buoyancy modules create characteristic M-shape in water column
- Module dimensions: typically 10m blocks, density ~0.694 te/m3
- Buoyancy placement defined by arc-length ranges along jumper
- Net buoyancy per module determines equilibrium shape
Rigid End Connectors
- Modelled as separate short OrcaFlex lines with very high bending stiffness
- Typical: OCS 200-V connectors, OD ~1.8m, length ~0.5-1.0m
EndBxBendingStiffness: 1.0e+307 (effectively rigid)- Connected to main jumper via end connections
Installation Rigging Chain
The full lift system from vessel to jumper, modelled as linked OrcaFlex objects:
- Vessel — Installation vessel with RAOs
- Crane Pedestal — 6DBuoy at vessel crane location
- Crane Boom — Constraint object (boom geometry)
- Crane Wire — Winch object (main hoist)
- Sling — Line from winch to masterlink
- Masterlink — 3DBuoy (central connection point)
- Slings — Lines from masterlink to spreader bar ends
- Spreader Bar — 6DBuoy (~120ft / 36.6m)
- Lift Slings + Turnbuckles — Lines from spreader bar to clamp points
- Clamps — Attached to jumper at pickup arc lengths
