cosalt/bexco offshore mooring systems single point moorings mark brooks ieng miie business...

Cosalt/Bexco Offshore Mooring Systems

Single Point Moorings

Mark Brooks IEng MIIEBusiness Development Manager

for operational performance, reliability, safety & on-time delivery



The major business activities of

Cosalt: safety & protection

Rope – Fibre, Wire & Combination

Rigging & Lifting

Marine Safety Equipment

Life Saving Appliance Servicing

Fire Fighting & Inspection

“the complete marine service provider”



Cosalt: safety & protection

Cosalt plc turnover ~ £Stg 151 million

Cosalt: Safety & Protection ~ £Stg 35 million

18 UK Businesses in port based locations

The markets of Cosalt: safety & protection

Onshore17%

Retail & Cash Sale5%

Offshore, Ocean & Coastal31%

Industrial & Waterside

23%

Harbour & Rivers24%

Major Rope Constructions

3-Strand 6-Strand

Circular Braided - Ultraline 8-Strand

12-Strand



Double Braided (2-in-1)

Fibres & Ranking

Polypropylene

Polyester / Nylon

Aramid

UHMPE





Rope Properties – Wear & TearFiber type Cut

resistanceabrasion resistance

dry wetDyneemapolyester

nylonPP

aramid

++++++++

+++

++++

+++++

++++++o-

Testing rope wear is

always machine

dependent

Tests can be used to rank

materials & rope

constructions

Static load

rope on metal



Yarn on Yarn or Rope on ropelong lengths chafing against each other:- type of wear (abrasive, melting)- environment (dry, wet)

Yarn on metal or Rope on metallong lengths chafing over an object:- type of wear (abrasive, melting)- environment (dry, wet)- protection

rope on rope

rope on metal

Rope Testing - Abrasion

Marine Finish is used to improve the Safe Working Life in marine environment

Test conform ASTM D6611-00

Yarn-on-Yarn Abrasion

10

100

1000

10000

100000

0% 2% 4% 6%

Applied Tension (N/tex)

cycl

es to

fai

lure

Marine Finish

standard

Marine Finish



Advantages of 8-strand rope:+ efficient construction+ torque-free+ easy to handle+ easy to splice

Points of attention:- yarns can be pulled- in winching: only on a split

drum

8-Strand Multiplait Rope Construction



Advantages :better abrasion resistance; smooth surface (strands/yarns will not get caught easily) rope is round : visual aspect easy to use on the winch (no burying because of round

construction) non-rotating endless ropes possible very easy to splice ideal for lifting with free end (non rotating + round)

12-Strand Multiplait Rope Construction



Ultraline Construction

Rope Construction

Typical penetration of UV

into rope is 1-2 mm

cores

cover

- Cover not only protects against abrasion, but also UV- Small repairs are possible if inner strength has not been ccompromised – strength will not be affected.

- All rope strength is contained within central cores.



Double Braided Construction

Rope Construction

- Strength is shared 50/50 between braided core and braided cover / sheath- Most common type of rope used for SPM mooring hawsers





OCIMF GUIDELINES

Type approval of nylon SPM Hawsers is conducted under the OCIMF 2000 Guidelines, 1st Edition

Major Difference between OCIMF 1987 and OCIMF 2000

Number of tests required

Should be repeated every 5 years

Larger than 20” ropes are to now be tested

Quantification of the behaviour of the marine finish

TCLL values (8 strand): polypropylene 52% polyamide (standard) 55% steel (laid) 60%

polyester 70% Ultraline® Nylon 75% Double Braid Nylon

69.1% Deltaflex 80%

Dyneema > 100%

Oil Companies Int. Marine Forum standard fatigue test

Thousand Cycle Load Level

40

50

60

70

80

90

0 1000 2000 3000 4000 5000 6000

cycles

% M

BL

TCLL is an accelerated fatigue test to obtain a quick comparison between ropes and materials





tension-tension fatigue life

0%

20%

40%

60%

80%

100%

1 10 100 1000 10000 100000 100000 1E+07

cycles to failure

Peak load (% MBL)

BL3

Other

TR

TCLL values

The effect of different TCLL values is translated back to load levels representative for practical loading conditions (here these are assumed to be less than 40% of the MBL).

Following the OCIMF the cyclic fatigue curve is represented as the peak load versus the logarithmic of the cycles to failure.

As recommended the cyclic curve is represented by a linear line, going through 1 cycle @100% and the TCLL load value obtained for a 1 000 cycles.

When translating the differences in TCLL to load levels encountered in practical situations, their importance becomes clear.

Based on the result for the OCIMF TCLL test a Cosalt/Bexco ULTRALINE BL3 will last some 10 000 000 cycles when cycling to 40% of its MBL. A.N. OTHER with a TCLL of 68% will last some 380 000 cycles for examples, and ropes with a lower TCLL even less cycles

Components



Typical SPM Assembly

- Buoy / FPSO Chafe Chain

- Heavy Duty Shackles

- Rope Thimbles

- Mooring Hawser

- FPSO / Shuttle Tanker Chafe Chain

- Support Buoy / Pick-up Buoy

- Pick-up Ropes / Messenger Lines

- Load Monitoring Systems

Components



Buoy / FPSO & FPSO / Shuttle Tanker Chafe Chains

- Vetted & approved suppliers only - ISO 9001/9002

- Close working partnership

- Majority is European Manufacture / Far Eastern can be supplied if requested

- Production Range 16mm - 120mm Diameter in various grades

- Laboratory & testing facilities

Components



Heavy Duty Shackles & Thimbles



- European Manufacture


Components



Heavy Duty Shackles

- Forged alloy steel

- Finish painted / Galvanised

- Double nuts & S/S cotter pins

- MBL is 5 x SWL

Components



SPM Cast Thimble

- High strength cast corrosion

resistant steel (Galvanised)

- Stainless steel

- Shackle retaining bar

Components



Tubular Thimble

- Fabricated construction

- Mild steel

- Finish galvanised / plastic coated

Components



Bellmouth Thimble

- Reusable

- Mild steel (galvanised)

- Stainless steel

Components



Mooring Hawsers

- Manufactured by BEXCOropes

- All hawsers supplied manufactured & supplied to OCIMF 2000

- Over 8 years experience, SPM hawsers

- Reference history

Selection of mooring hawser

- Repeat loading

- OCIMF TCLL value

- Abrasion resistance

- Energy absorption

Constructions available

- BL3 Ultraline Nylon

- DB12 Double Braid Nylon

- DF8 Deltaflex Composite

Enhancements

- PU coating

- Additional protection sleeves

- Tubular rope floats

Components



Support Buoy / Pick-up Buoy

- Vetted & approved supplier only


- UK Manufacture

Cylindrical Chain Support Buoy

- Central steelwork

- Galvanised swivel ends

- Resiliant closed cell foam

Components






- UK Manufacture

Cylindrical Through Chain Support Buoy

- Through steel tube

- Chain lock plate one end

- Resiliant closed cell foam

Components






- UK Manufacture

Pick-up Buoy

- Fixed eye each end

- Central steelwork

- Resilient closed cell foam

Components



Pick-up Ropes / Messenger Lines

- Nutech brand

- High strength co-polymer yarn

- High visibility yellow colour*

- Permanent flotation - SG 0.91

- Non-rotating, torque-free rope

- Fully UV stabilised

- Excellent abrasion resistance

- Flexible, easy to handle & splice* other colours available on request

Available in 8 or 12 strand construction

Also available SPUNSTAPLE POLYPROPYLENE

Components



Load Monitoring Systems



- European Manufacture


Benefits of Load Monitoring

- Safe operation

- Hawser life prediction

- Optimise hawser service life

- ‘Bells & whistles’!!



Mooring Hawser Supply

31

76

25

6757

68 63

90

141

113

0

20

40

60

80

100

120

140

160

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

Manufacturing hawsers since 1997

Active Areas / Representation

Operation & Maintenance Guidelines



“To achieve optimum life operators need to develop inspection, handling and

maintenance procedures based on local conditions”

We are here to help you with this

IF THERE IS ANY DOUBT ABOUT THE CONDITION

OF A ROPE IT SHOULD BE REJECTED



Supporting Documentation

FactFile [Bulletin No.14]

Offshore Mooring Systems


“Total System Management”

also on CD-Rom


www.cosalt.co.uk /

www.bexco.be

Cosalt International LimitedFish Dock Road Grimsby N.E. Lincolshire DN31 3NW

United Kingdom

Telephone 44 (0) 1472 504258 Facsimile 44 (0) 1472 504257e-mail: [email protected]



Any questions?

Photographs courtesy of Bluewater Engineering BV & Geolitel Corporation

cosalt/bexco offshore mooring systems single point moorings mark brooks ieng miie business...

Documents

rope rope

strand rope

rope strength

time delivery slide

safety protection rope

time delivery rope properties

operational performance

time delivery cosalt