HMPE Rope v Wire NC

7/31/2019 HMPE Rope v Wire NC

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HMPE Rope v Wire



Why Wire?

Cheaper

Tried and tested

Deterioration is visible with regular checks

Hard wearing

Tough resistance to bad handling Short elongation

Easily sourced globally for supply



Benefits of Synthetic / HMPE

Synthetic Lines have a number of advantages• Light weight

• Easier to handle, reduced crew injuries

• No grease involved in the maintenance – No environmental impact

– No grease on decks to make them slippy – Keeps mooring areas in clean appearance.

• Floats

• Comparable strength to wire

• High strength to line diameter

• Quoted as being longer rope life Many types of Branded Synthetic lines are available,

made from HMPE, Aramid’s, Polyimides and Nylons, • Each will have its advantages and disadvantages



Some other Synthetic line issues

20% is quoted by certain manufacturers as been the designed workingload

140t x 0.2 = 28t

This should be the normal working load on the lines.

QFlex vessels have OPTIMOOR mooring studies done to show that the

loads do not exceed 50% MBL (70t)

Routine loads on a Qflex whilst moored are normally 20-30t

Comparable more expensive than a wire, but should last longer



Advantage - Disadvantages

MATERIAL ADVANTAGES DISADVANTAGES

Polypropylene

•Floats

•Inexpensive

•Not sensitive to chemical attack

•Tough, abrasion resistant

•Resists wetting

•No loss of strength in water

Would not be considered for mooring lines•Degrades in UV

•Not very strong

•Stiff, knots come undone (some softer braids are made)

•Low melting point

•Stretches (not as much as Nylon)

Nylon

Perlon

•Good UV Resistance

• Absorbs shock (stretches)

•Good chemical resistance

•Moderately priced

•Would not be considered for mooring lines, used in Tails •Very stretchy

•Weaker in when wet

•Smoke is harmful (cyanide)

Polyester

•Excellent UV resistance•Moderate stretch

• Abrasion resistant


•Keeps strength when wet

•Moderately priced

•Not unpleasant to handle

•Sinks

•Quite stiff

(HMPE)

Spectra, Dyneema,

Nomex

•Strong

•Doesn't wet

•Very Chemically resistant

• Abrasion Resistant

•UV resistant•Light and floats

•Good flex fatigue resistance

•Slippery

•Low melting point

•Creeps under constant load

•Expensive

Aramid

Kevlar, Twaron,

Technora

•Very Strong

•Low stretch

•Low creep

•Fire Resistant


•Cut resistant

•UV sensitive

•Sensitive to shock loads

•Sensitive to Chlorine

•Poor flex/fatigue resistance

•Weakened by knots

•Sensitive to internal friction

•Expensive



Katradis

Name - SPECTRA

• HMPE (SPECTRA, Honeywell)

• Single or double braid

• NON Jacket

• Floats• 42mm single = 144t MBL

• 46mm double = 149t MBL

Used on very few LNG vessels

No positive feedback from OSG offices or other users

Uses Koronakis rope making facility



Bridon

Name -

Steelite UHMPE fibre ropes• 12 strand

• Jacketed

• 44mm = 146mt MBL

• Bridon are quoting for a larger rope 44mm

• Is this due to them under sizing the original spec?• Does this allow a larger amount of HMPE material to be in the rope?



Samson

AMSTEEL BLUE

• HMPE

• 12 strand single braid

• Non jacket

• 42mm = 139t MBL

• Samson ropes are the most expensive in the selection

• Good customer relations

• Normally play a good role in shipboard training and assistance



Lankhorst

LANKO FORCE

• Dyneema HMPE

• Non Jacket

• 12 strand braid

• 42mm = 144MBL – 2% elongation @ 50% MBL

STRONGLINE

POLYESTER

68mm = 144t MBL

10% elongation

@50%MBL

Jacketed

• Lankhorst supply other lines and cordage to other OSG vessels, but not

presently mooring lines

• Has some positive feed back from other users

• 2nd most expensive in Dyneema products



Koronakis

KAPANEEMA – PLUS

• HMPE (Dyneema)

• Jacket

• Floats

• 42mm = 140t MBL

• Middle of the price range, with perhaps some more room to get down?

• Good Customer feedback from other users.



Rope Failures by Manufacturer

Bridon57%

Bridon/Marlow

30%

Koronakis3% samson

10%

Bridon, 48%

Bridon/Marlow, 25%

Koronakis,2%

samson, 24%

One item not clear is each manufacturers market

share, how many vessels have their rope on-board;

this value is the share of the reported failures

Total Failures of lines reportedExcluding noted heavy weather events, where thereport has evidence of heavy ship movement



Which one to choose?

• Bridon are the present manufacturer on-board• Bridon ropes perhaps caused the investigation to be started into the rope

failures

• OSG has suffered 6 failures on 4 vessels in 4 years

• Bridon show poor customer relations

• Bridon have not been very proactive in answering customers relating to

causes of failures

‒ Samson are the most expensive with no real strong justification for the

price.

Katradis are the cheapest but with little customer base in the LNG sector.

• Lankhorst offer a comparable product to Koronakis but at a higher price

• Lankhorst, Katradis and Koronakis share the facility in Greece.

• Koronakis present a product that has recommendations at a competitive

price.

• No one is going to give a guarantee of zero failures, or length of service.

HMPE Rope v Wire NC

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