ULTRA-DEEP SUBSEA CRANEWITH FIBER ROPE

HUISMAN EQUIPMENT

IMCA CONFERENCE AMSTERDAM

27-09-2018

HUISMAN - EQUIPMENT

Table of content

1. Introduction fiber rope

2. Fiber rope for subsea installation

3. Huisman subsea crane with fiber rope

4. Huisman fiber rope research

5. Summary

ULTRA-DEEP SUBSEA CRANE WITH FIBER ROPE

1. INTRODUCTION

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1. INTRODUCTION FIBER ROPE

More than 10 years fiber rope development Huisman

Research Spooling system Heat development Rope lifetime Subsea block stability Rope selection End connection Rope monitoring

Applications Round slings Stays Tuggers

Subsea installation system

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1. INTRODUCTION FIBER ROPE

Stays Stays for super flyjib in 2012 to reduce weight and increase handling speed Fibremax with Teijin Technora fibre

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1. INTRODUCTION FIBER ROPE

Fiber rope on crane tuggers

Increased safety: Lighter Less stiffness Easier handling

Increased handling speed: Lighter Lower bending stiffness Torsion free

Maintenance, inspection and transport: Not sensitive to corrosion No need for lubrication Easy inspection On-board in-line splicing possible

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1. INTRODUCTION FIBER ROPE

Benefits fiber rope compared to steel wire rope Increased subsea capacity due to buoyancy of the rope Not sensitive to corrosion No lubrication required Can be inspected internally Torque free Lower weight to ease handling and transport Repair of mid rope sections by splicing Lower (axial) stiffness

Disadvantages fiber rope compared to steel wire rope Maximum operational temperature is 70oC (HMPE) Lower bending lifetime More sensitive to abrasion, sharp edges Low friction (e.g. traction winch systems) Low radial stiffness and lack of shape (e.g. cutting-in and-stick slip on winch)

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2. FIBER ROPE FOR SUBSEA INSTALLATION

Subsea capacity fiber and steel rope

Deploy 150mt in air at 4km of water depth

350mt crane using steel wire rope

150mt crane using fiber rope

Fiber rope results in

reduced power consumption during AHC

a smaller crane

smaller vessel size

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2. FIBER ROPE FOR SUBSEA INSTALLATION

Torque properties fiber versus steel rope Steel wire rope will rotate when loaded

Protrusion of the rope

Lower block instability

Fiber rope is torque neutral

Allows multi-fall operation

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Torque neutral fiber rope

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Low-spin steel wire rope

3. HUISMAN FIBER ROPE CRANE

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3. HUISMAN FIBER ROPE CRANE

Huisman design philosophy

Treat fiber rope as an asset and ensure operation is safe and reliable

Limit fiber rope temperature during heave compensation

Maximum operational temperature of the rope is 70oC (HMPE)

Rope temperature increases significantly when heave compensated

Rope cooling will be part of the safety system

Fiber rope is treated as an asset

Maximize Lifetime of the valuable fiber rope

Bending lifetime is halve that of steel wire rope

A reduced operational rope temperature and smaller diameter increases the rope lifetime

Avoid heave compensation on the fiber rope

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3. HUISMAN FIBER ROPE CRANE

Hybrid fiber rope crane

ULTRA-DEEP SUBSEA CRANE WITH FIBER ROPE

Features Rope transfer to improve lifetime of fiber and steel rope Single line operation with steel and fiber rope

No heave compensationon fiber rope winch

Heave compensationon steel wire rope winch

Sheave notRotating during AHC

Sheave rotatingbut water cooled

SheaveRotating during AHC

Rope spacer for block stability during subsea operation

Patent pending11

Single line operation with steel wire rope to increase lifetime fiber rope

3. HUISMAN FIBER ROPE CRANE

Hybrid fiber rope crane

ULTRA-DEEP SUBSEA CRANE WITH FIBER ROPE

Fiber rope

Steel wire rope

Connection fiber and wire rope

Steel wire rope winchFiber rope winchwith cover for UV protection

Dual fall block

Slip-less traction winch (with cover)

Storage winch

SpoolerPatent pending

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3. HUISMAN FIBER ROPE CRANE

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Fiber and steel wire rope have their unique benefits

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Topic Fiber Rope Steel Wire RopeDeepwater lowering + +Remaining capacity at deepwater + +/-Corrosion resistance + -Inspection + +/-In-line splice + -Torque free + +/-Heave compensation / heat resistance - +Price of rope (CAPEX & OPEX) - +Rope fatigue lifetime - +Resistance to sharp corners - +Proven technology - +

3. HUISMAN FIBER ROPE CRANE

Topic Fiber Rope Steel Wire Rope Huisman HybridDeepwater lowering + + +Remaining capacity at deepwater + +/- +Corrosion resistance + - +Inspection + +/- +In-line splice + - +Torque free + +/- +Heave compensation / heat resistance - + +Price of rope (CAPEX & OPEX) - + +Rope fatigue lifetime - + +Resistance to sharp corners - + +/-Proven technology - + +

ULTRA-DEEP SUBSEA CRANE WITH FIBER ROPE

Dual fall crane combines the benefits of fiber and steel wire rope

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4. FIBER ROPE RESEARCH

Huisman research fiber rope for subsea installation Huisman started research in fiber rope in 2006 Varying test equipment developed for testing fiber rope Integration of the fiber rope into the crane system to manage rope temperature and

lifetime

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4. FIBER ROPE RESEARCH

Hoist system - multi-layer spooling of a fiber rope

Tension variations results in:

cutting-in

stick slip resulting in shock loading

Special spooling techniques are very sensitive to errors

Fiber rope lifetime on drum with high tension is lower than steel

Jacketed rope does not improve spooling behavior with a direct winch

Storage winch with constant tension is the most robust solution

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Traction winch design Heat due to slip is negligible if traction winch is designed for the fiber rope

Groove design depends on rope properties Torque is controlled per drum

The drums function as a heat sink for the fiber rope and has a much larger cooling capacity than air

Traction winch optimized for fiber rope based onstandard and proven design

4. FIBER ROPE RESEARCH

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4. FIBER ROPE RESEARCH

Fiber rope has a limited operating temperature

Maximum operational rope temperature of HMPE is 70oC

At 70oC the fiber rope has lost more than 20% of its strength

Bending lifetime of a fiber rope reduces a factor of 2 per 20oC increase

Limited margin with an environmental temperature of 45oC

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Rope failure due to overheating

Source: Samson Ropes

Measurement of rope temperature

Rope core temperature can be 20oC higher than exterior rope temperature during heave compensation

Inaccuracy temperature sensors is +-5oC

Location temperature sensor is not necessarily the hottest spot on the rope’s exterior

Heave compensation using fiber rope not preferred

4. FIBER ROPE RESEARCH

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Limits and accuracies Temperature

Temperature limit (HMPE) 70oC

Sensor inaccuracy +-5oC

Temperature difference with rope core 20oC

Inaccuracy location of measurement +-5oC

Temperature limit measurement by sensor 40oC

Rope temperature control Rope temperature easily exceeds 70oC temperature limit during heave compensation

Significant active cooling measures required which will be part of the crane’s safety system

4. FIBER ROPE RESEARCH

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4. FIBER ROPE RESEARCH

Block rotation with steel wire rope Steel wire rope will induce torque when loaded Twist in the rope will generate a torque on the

lower block Sea current on the load and block

Rope spacer field proven for steel wire rope Fiber rope is torque neutral due to its braided

construction Easier to prevent twisting for fiber rope

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4. FIBER ROPE RESEARCH

Rope usage monitoring

Determines the consumed lifetime of the steel and fiber rope

based on the actual usage

Optimization of the steel and fiber rope lifetime using auto

transfer

3D Rope vision system (patent pending)

Reconstruction of the rope section along the complete rope

Measurement of the rope profile diameter, fluffiness, etc.

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SUMMARY

Subsea operation with fiber rope Full crane capacity at water depth Corrosion and lubrication free fiber rope In-line repairs of the rope for increases lifetime or increased rope length

Slip-less traction and storage winch No risk of cutting-in of the fiber rope No-stick slip effects on winch during large tension variations Robust spooling pattern Limited heat development Improved rope lifetime Storage winch and sheave will be covered for UV protection

Non-jacketed rope Internal and external visual inspection possible Higher strength Easier to splice No relative motion between jacket and load bearing material

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SUMMARY

Heave compensation on steel wire rope winch No heat build-up in fiber rope No active cooling required and is no part of safety system Significant increase lifetime of valuable fiber rope Rope lifetime optimized by rope transfer steel wire and fiber rope

Dual fall operation Torsion free fiber rope Smaller rope diameter increasing lifetime, easing handling, reducing

cost Single line fiber rope to double the water depth (without AHC)

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QUESTIONS

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