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​MOORING LINE SELECTION
FACTORS TO CONSIDERASB_MooringLines_OnWinch2_CM2012.jpg
A number of factors should be considered when selecting a Samson mooring line, such as
          >    intended use or application,
          >    potential abrasion issues,
          >    surface preparation,
          >    rope design/construction,
          >    chafe protection,
          >    proper installation procedures,
          >    inspection schedule, and
          >    retirement criteria.

Samson works with you to ensure that there is a comprehensive understanding of each of these considerations to ensure a long service life and mitigate unnecessary failure. 

Understanding Abrasion
Abrasion is one of the biggest culprits of line destruction. There are two types of abrasion: internal abrasion caused by the relative movement of internal and external yarns; and external abrasion caused by contact with external surfaces, such as roller and panama leads. External abrasion is usually easy to see on any rope, while internal abrasion is easier to inspect in a single braid rope. When a rope moves over an abrasive surface, both factors cause the outer surface to move slower, while the internal fibers continue along their original path. This type of friction causes heat, and heat is an enemy of synthetic fibers.

Mitigating the Effects of Abrasion
Vessels and equipment that have traditionally used wire rope often have sustained significant damaged caused by fishhooks, broken strands, etc., which come in contact with the deck and other equipment. These conditions can damage or significantly reduce the life expectancy of ropes made with Dyneema®. However, an owner/operator can take preventative measures to mitigate these issues by repairing all rope contact points to a smooth and consistent surface.

The addition of chafe protection utilized on the areas of the line most likely to suffer from abrasion is critical for the rope’s longevity. These are either sleeves that slide on the rope or spliced into a line, depending on the construction of the rope and its use.

Line Installation
After surfaces have been prepped, the working line should be installed on the winch with significant back tension. The device used to create the tension should have a smooth and consistent surface, and the installation speed or tension applied should not generate excessive heat buildup on the rope. 
As the line is wound onto the winch, it should be closely packed to minimize areas where the rope may “dive” or bury into the layers of the winch. Install each layer in the valleys of the previous layers or crossed over each other to support each subsequent layer. Never stack the layers on top of each other.

When the line is used, eight to ten wraps must always remain on the tension side of the split-drum winch at the line’s full extension. Every precaution needs to be taken to prevent twist from being introduced into the line during use. Twist is often overlooked as a contributing factor in the reduced life of Samson high-performance mooring line. 


Rope Design and Construction
One of the best ways to combat unforeseen situations and prevent failure is to select the mooring line and tail, or pendant, appropriate for your vessel. Many ship owners, managers, and terminal operators are aware of the advantages of Dyneema® and have become accustomed to asking for jacketed mooring lines. However, the advantages of nonjacketed lines are numerous: they are stronger than jacketed lines size-for-size and are easy to inspect and repair. Unlike jacketed lines, which can rupture in the areas that suffer the greatest abrasion and have to be replaced, only the chafe protection on a nonjacketed rope has to be replaced, saving time and money. A 12-strand mooring line system such as AmSteel®-Blue with Saturn Dynalene chafe protection provides the ultimate in cut and abrasion resistance, and the rope maintains its strength for the long-term.
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Proper selection of the mooring pendant also affects the performance of the mooring line. Recent studies have included the effects of tail length with varying materials. Depending on their application, there has been some success with increased tail lengths of 72 feet (22 meters), and nylon or polyester pendants have been found to
be beneficial due to their increased elastic elongation.

Inspection Schedules and Residual Strength Testing
For the best use of Samson high-performance mooring lines, it is essential that crewmembers be trained on proper rope-handling and safety procedures. This includes rope inspection, the use of chafe gear, rope repair, and splicing techniques.

Samson is the only rope manufacturer to provide this service. We call it The Samson Advantage, which includes training conducted by qualified technicians, periodic in-field inspections of the line and associated equipment, and a program of residual strength testing to help determine inspection and retirement criteria.
 
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The Samson Advantage includes training conducted by
qualified technicians, periodic in-field inspections, and
residual strength testing.