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HMPE Ropes:Benefits to the Trawl Industry
HMPE-Synthetic Wire RopeHMPE fiber rope has been effectively used as wire rope replacement for applications that require manual handling or reduced weight.Today’s Trawl Applications
Gilson LinesTrawl Net BridlesFraming RopesCod End Rib LinesLifting Straps
Presentation Overview
Current uses in Trawl industryHMPE wire rope replacementEconomic ValueBenefits over Tradition fiber ropes
HMPE Fiber PropertiesRope PropertiesRetirement
Major Uses of HMPE ropesWire Rope Replacement
Gilson LinesTrawl Net Bridles
Chain replacementCod End Rib Lines
Traditional Synthetic Rope Replacement
Framing ropes
Wire Replacement: Key benefit
Economic Value
HandlingRigging Hardware costsLongevityMiscellaneous
Economic Value: Handling.Size-for-Size
Economic Value: Handling.Weight
1” 12 Strand HMPE Rope
21.8 lbs for 100 feet
1” IWRC Wire Rope
185 lbs for 100 feet
Economic Value: HandlingWeight
Economic Value: Rigging CostsHardware
Reduction of components:
FlatlinksG-HooksHammerlocks
Elimination of components
Swivel Rollerbearing
Lifetime cost reduction
Economic Value: Longevity.TCLL Test Method
TCLL – Level of load that fatigues rope to break at the 1000th cycle
- fatigue resistance test
1. 50% of rope’s breaking strength – 1000 cycles2. 60% of rope’s breaking strength – 1000 cycles3. 70% of rope’s breaking strength – 1000 cycles.4. …..continue the procedure at 10% incremental of
breaking strength till rope breaks.
The results are then used to calculate a TCLL value which theoretically represents the load (expressed as a % of the breaking strength) at which the rope would fail at exactly 1000 cycles.
Economic Value: Longevity.TCLL Test Results
Economic Value: Longevity.
Economic Value: Longevity.Bending Fatigue (D/d = 25)
Economic Value: Miscellaneous
Lubricating wireDamage to the vessel
Wire Rope Replacement Economic Value:
Reduced InjuriesReduced crew fatigueReduced Seasonal Hardware costsIncreased lifetimeLess Maintenance
Traditional Rope Replacement.Key Benefits
Increased LifetimeWeightBetter Abrasion resistance
Abrasion Resistance
HMPE fibers
High Modulus Polyethylene FiberDyneema-DSM High Performance Fibers, The NetherlandsSpectra-Honeywell, USA
DyneemaSK-60SK-75
SpectraSpectra-900Spectra-1000
3.4
0.97
1300
35
1150
Spectra1000
3.63.64.4Elongation%
Cross-section
Densityg/cc
Weightdenier
Strengthg/denier
Modulusg/denier
0.970.970.97
160016001600
403227
12801020720
DyneemaSK-75
DyneemaSK-60
Spectra900
HMPE fiber properties
HMPE fiber ropesImportant Rope Properties
Strength• Initial Strength• Strength after usage
WeightAbrasion resistance
Measurements of Properties
Rope properties are a function of the test method used to measure them.
WeightRelaxed weightReference load weight
Initial Rope StrengthISO Standard-measures un-terminated rope strengthCI Standard-measures spliced rope strength
Measurements of Properties
Rope strength after usageAll material generally get weaker with use.
Abrasion TestingNot directly comparable to real world environments.Used to qualitatively compare materials
HMPE Fiber Ropes Properties:Initial Strength
Rope DesignRope ConstructionTwist LevelsPick AngleCoating
Optimize Construction for Application
HMPE Fiber Ropes Properties:Initial Strength
Post-ProcessingHeatTension
Increase strength up to 25% and reduce diameter by 20%
Post Processing Effects:Initial strength vs Longevity
Post Processing Effects:Initial strength vs Longevity
Rope Performance: Mechanisms influencing Longevity
New Rope:ConstructionProcessing
Used RopeAbrasionImpact/Shock LoadingDrum compressionCyclic fatigueInduced Twist
Effects of Abrasion
At t = 0
Reference 31.500 kg 100 %
At t = 4190 cycles @ 60% Reference
1. Drum layer 1 24.860 kg 79 %
2. Drum layer 2 24.260 77 %
3. Drum layer 3 26.610 84 %
4. Buried rope 26.750 85 %
5. Horizontal part 31.920 101 %
6. Bending point 30.550 97 %
Horizontal part = Tensile Fatigue not an issue
Effects of Tensile Fatigue
Develop Retirement Criteria
Retirement
Current Retirement: Gilson lines- 1-2 seasonsBridles- 4 seasonsFraming Ropes –Not defined (3+ seasons)
Retirement based on usage/residual strength
Conclusions
HMPE ropes provide sound economic value over wire rope.
Reduced InjuriesReduced crew fatigueReduced Seasonal Hardware costsIncreased lifetimeLess Maintenance
Not all HMPE fibers are the sameNot all HMPE ropes are created equalRetirement Guidelines based on usage