SlideShare a Scribd company logo
Do They Really matter?
www.cpnl.eu
ProductDiameters
The Short answer is YES they do.
A section exposed to dynamic influences will
experience drag induced forces.
Based on Hydrodynamics the formula for
Drag is defined as:
Where:
As area is directly related to diameter we would
expect the diameter to influence resulting drag
forces
Simple Explanation
www.cpnl.eu
ProductDiameters
Plastic System OD : 400mm
CPNL System OD : 260mm (Max)
Area of Drag for 4m Length : 1.6m2
Area of Drag for 4m Length : 1.04m2
Reduction in Drag Area of 35%
400mm
260mm
The Result
www.cpnl.eu
ProductDiameters
From the equation, the resulting drag force is directly
proportional to the area exposed to moving fluid.
Water Velocity (kts)
DragForce(kgF)
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5
Plastic System
CPNL System
Figures based on force applicable on a 4.3m length cylinder
Conclusion
www.cpnl.eu
ProductDiameters
A larger OD diameter will increase forces associated
with Drag, vs a smaller OD System.
These systems require thicker walls, which increase
thermal insulation of the power cable
The increase in forces invariably results in a need for
additional material to prevent failure.
More material, results in higher likelyhood of issues
during plastic production process, not to mention cost.
These increased forces will be present throughout the
lifetime of the system, but cannot be designed out in a
plastic system due to material limitations.

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Drag comparison for Offshore Power Cables

  • 1. Do They Really matter? www.cpnl.eu ProductDiameters The Short answer is YES they do. A section exposed to dynamic influences will experience drag induced forces. Based on Hydrodynamics the formula for Drag is defined as: Where: As area is directly related to diameter we would expect the diameter to influence resulting drag forces
  • 2. Simple Explanation www.cpnl.eu ProductDiameters Plastic System OD : 400mm CPNL System OD : 260mm (Max) Area of Drag for 4m Length : 1.6m2 Area of Drag for 4m Length : 1.04m2 Reduction in Drag Area of 35% 400mm 260mm
  • 3. The Result www.cpnl.eu ProductDiameters From the equation, the resulting drag force is directly proportional to the area exposed to moving fluid. Water Velocity (kts) DragForce(kgF) 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 Plastic System CPNL System Figures based on force applicable on a 4.3m length cylinder
  • 4. Conclusion www.cpnl.eu ProductDiameters A larger OD diameter will increase forces associated with Drag, vs a smaller OD System. These systems require thicker walls, which increase thermal insulation of the power cable The increase in forces invariably results in a need for additional material to prevent failure. More material, results in higher likelyhood of issues during plastic production process, not to mention cost. These increased forces will be present throughout the lifetime of the system, but cannot be designed out in a plastic system due to material limitations.