presentation - ihc - deep water installation with fibre rope; technical...

Deep Water Installation with Fibre Rope;technical and market perspective

Erik van der Woude | Royal IHC

• Deep Water Installation with Fibre Rope; technical and market perspective • IHC | Erik van der Woude •

Slide 1

IS THIS WHAT WE NEED?


DEEP WATER INSTALLATION: LIMITS OF STEEL CABLE

Exponential increase of weight of steel cable raises costs of installation operations at larger water depths:• Size and weight of mission equipment• Weight of steel wire rope• Required power

Example:Lifting 150 mT @ 1.5 m/s from 2,500 m water depth

Steel wire rope:Line pull: 260 mTPower: 4,000 kW

Fibre rope:Line pull: 150 mTPower: 2,250 kW

Slide 2

Required line pull and power for steel cable and fibre rope for lifting a 150mT structure with 1.5m/s


POLYMER FIBRE; AN OBVIOUS BUT CHALLENGING ALTERNATIVE

Slide 3

0

1

2

3

4

5

6

7

8

9

0

0,5

1

1,5

2

2,5

3

3,5

Steel 1960 Steel 2160 HMPE Aramids LCP

Specific gravity

[kg/dm

^3]

Ultimate Tensile

Stren

gth [GPA

]

MATERIALSUTSSpecific gravity

Sea water


FIBRE ROPE CHALLENGES

• a lower axial stiffness• more sensitive to temperature• has a lower heat-transfer coefficient • shows viscoelastic and viscoplastic behaviour

These challenges can result in excessive wear of fibre rope when applied on conventional winch systems designed for steel wire rope

Slide 4

New, used and severely abraded fibre rope


FAILURE MECHANISMS

Lifespan of fibre ropes determined by:• Temperature

Mainly caused by the heat generated inside or at the surface of the rope • Abrasion

Caused by contact stresses combined with slip between 2 surfaces

Amount of dissipated energy is practical indicator for amount of abrasion.

• Source of energy dissipation: Hysteresis effect due to viscoelasticity of rope material Friction internal and external

• Location

• Amount

• Time derivative

Slide 5


SIMULATION OF ROPE HANDLING; A VIRTUAL MODEL

• Investigate the individual contribution of different phenomena • Built up from yarn to strand to rope• Adaptable and scalable to different materials and rope constructions• Amount of dissipated energy due to internal friction can be calculated

Slide 6


SIMULATION OF ROPE HANDLING; RESULTS

Dissipation of elastic energy U• Due to slipping and surface traction• Generating heat • Causing abrasion

Influenced by:• Number of winch stages• Diameter sheaves• Torque distribution

Slide 7


RESEARCH CONCLUSIONS

For best technical performance:

• Lowering and equalization of dissipated elastic energy over the total trajectory of winches stages

• Optimized Torque distribution control of individual winch stages

For best overall (commercial) performance:

• Complexity

• Reliability

• Compactness & weight

Slide 8


Dissipated

ene

rgy

20% SWL 40% SWL 60% SWL 80% SWL 100% SWL0

2 drum traction winchIHC IDsisIndividually driven sheaves

IDsis FIBRE ROPE TRACTION WINCH

• 2 sheaves (grey) + 2 drums (black), each individually driven• Sheaves bear largest force transfer• DDTC (Dynamic Distributed Torque Control)

Slide 9

Line pull maximum 500 kNRope ø 65 mmSheave and drum ø 1300 mm


WAY FORWARD; THE NEXT STEPS

• Focus on dissipated energy for: Analytics and further development of multi-physics FEA models Lifting Mission Equipment designs and concept developments

• Focus on temperature measurement during testing of ropes

• Increase rope testing activities but keep them agile and opportunity driven; faster results at lower costs

Slide 10


WAY FORWARD; ANALYTICS AND MULTI-PHYSICS FEA MODELS

• Lifting mission equipment and rope interaction

• Detailed macro & micro operational cycle narratives and data

• Mapping that against the whole bucket of opportunities

Slide 11


WAY FORWARD; ROPE AND WINCH TESTING

• Detailed and in depth temperature measurements on rope and winch

• Heat mitigation methods (cooling of rope and winch)

• Correlation between temperatures and observed rope deterioration

• Test equipment and programs geared towards: Validating analytics and FEA models Provide evidence to reduce safety factor and extend rope life time

Slide 12


CONCLUSION AND FINAL WORDS

• Users, mission equipment builders and rope + fibre manufacturers seek vertical integration on very specific business opportunities

• Mission equipment builders take the lead in development projects

• Users empower the mission equipment builders with opportunities and their cyclic narratives and data

• Integrate Classification Authorities where needed for governance and risk mitigation for insurance

Slide 13

Fibre (rope) based lifting mission equipment shall enable economic growth where steel wire rope based equipment can’t

Thank you very much for your attention !!

Questions?

Erik van der Woude | Royal IHC

presentation - ihc - deep water installation with fibre rope; technical...

Documents