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The choice of mooring line is critical in terms of performance and safety and will of course also be led by economical factors.
BEXCO can offer ropes in almost any material and construction and as an example we recommend various alternatives for following types of vessels :
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tankers
Our BEXCOLINE COMPOSITE ROPES are particularly suitable for general mooring on bitts or on mooring drums.
- Bexcord :
- melted mix of polypropylene and polyethylene
- better abrasion resistance
- much higher strength than standard polypropylene ropes
- BexcoFloat and BexcoFlex
- are produced with polyester fibres covering a polyolefin core
- superior abrasion and friction resistance
- much higher strength than traditional polyamide (nylon) and polyester ropes
For larger tankers, like LNG carriers, ULCC & VLCC we have developed our ULTRALINE® DYNEEMA® ropes :
- load-bearing cores with Dyneema® and a cover of polyester composite yarn.
- the cover is optimised for wear and abrasion resistance
- the cores are optimised for strength
- the lifetime under fatigue loads is extraordinary
Containerships and Ferries
Our BEXCOLINE COMPOSITE ROPES offer a reliable and cost effective solution for safe and quick mooring :
- Bexcord :
- melted mix of polypropylene and polyethylene
- better abrasion resistance
- much higher strength than standard polypropylene ropes
- BexcoFloat and BexcoFlex
- are produced with polyester fibres covering a polyolefin core
- superior abrasion and friction resistance
- much higher strength than traditional polyamide (nylon) and polyester ropes
For larger container ships and ferries, our 6 strand ATLAS® and CAESAR ropes are the ideal choice :
- 6-strand construction
- ropes made from hightenacity polyamide, whereby mono- and multi-filaments are combined in the strands.
- the hardwearing monofilaments give the ropes excellent dimensional stability and abrasion resistance.
- the ropes are very compact and are designed for use as winch-mounted lines
- the splicing technique for Atlas is very similar to that of wire-ropes.
Cruise ships
Our BEXCOLINE COMPOSITE ROPES are particularly suitable for general mooring :
- Bexcord :
- melted mix of polypropylene and polyethylene
- better abrasion resistance
- much higher strength than standard polypropylene ropes
- BexcoFloat and BexcoFlex
- are produced with polyester fibres covering a polyolefin core
- superior abrasion and friction resistance
- much higher strength than traditional polyamide (nylon) and polyester ropes
For the biggest and most modern cruise ships we have developed our ULTRALINE® DYNEEMA® ropes :
- load-bearing cores with Dyneema® and cover of polyester composite yarn.
- the cover is optimised for wear and abrasion resistance
- the cores are optimised for strength
- the lifetime under fatigue loads is extraordinary
Navy and Inland shipping
Our BEXCOLINE COMPOSITE ROPES (see higher) are perfectly suitable as a reliable and cost effective mooring line.
For quick moorings, 8 or 12-strand ropes with DYNEEMA® offer many economic and safety advantages : they are stronger, lighter, easier to handle, safer, require less maintenance and are more durable.
SINGLE POINT MOORING HAWSERS (SPM)
For a Single Point Mooring (SPM) system a synthetic rope is used to connect an offloading tanker to a buoy. This hawser connects the relative small buoy to the large offloading tanker. In a heavy sea the hawsers need elasticity to compensate for the large movements of the buoy relative to those of the tanker. For this application nylon is a well-established material because of its excellent stretch characteristics. Its properties are influenced by water, however alternative SPMs are based on polyester composite fibres. These have a lower stretch but are not sensitive to hydrolysis and possess an excellent fatigue life.
The Catenary Anchor Leg Mooring (CALM) system is a flexible, cost-effective, safe and reliable offshore loading/offloading system that satisfies most offshore loading and offloading requirements. This concept has been used for a wide range of applications, water depths and for vessels ranging from smallest to the largest product carriers.
Single point mooring to a CALM buoy in shallow water has been the most important offloading option for many years. Nowadays it is also the preferred option for a lot of deep water field developments in combination with an FPSO for production and storage.
See also our section on SPM ropes for configuration and SPM types.
DEEP WATER MOORING LINES
Today, two basic systems are used in deep water mooring :
Taut-leg mooring :
As water depth increases conventional, catenary systems become less and less economical. For permanent systems a cost-effective, synthetic alternative has been developed: Taut Leg Mooring.
In this system each line is strung out directly to the seabed typically at an angle of 45°.
Insert Catenary mooring :
For temporary systems either a DeepRope® Polyester taut-leg or a catenary mooring with Dyneema® insert lines are a cost effective alternative for dynamically positioned rigs.
The choice between these two alternatives is driven by cost of the mooring versus operational limitations.
See also our section on DeepRope® for more information on the different configurations.