Long Line

Introduction

The long line is a heavy-duty rope made from high-strength, synthetic fiber with (or optionally without) electrical conductors. The long line is rated to carry a 6000 pound load with a 5-fold safety factor. In standard tensile tests the ultimate strength of the cable exceeds 30,000 lbs. The stretch at failure is only 5%, making this a light-weight, high-strength, low-stretch cable.

The core of the long line is composed of two types of synthetic fiber--Dyneema^® and Technora^®.  Dyneema fibers are gel-spun, high-molecular-weight polyethylene. Technora fibers are a type of nylon, consisting of linked benzene rings and amide bonds. The lubricity of the Dyneema core yarns provide excellent abrasion resistance, while the Technora core yarns eliminate any tendency of the rope to creep under sustained high loads. These fibers are, pound-for-pound, 8 to 10 times stronger than steel.

The long line has a 16 strand, double braid construction. Sixteen strands are braided into a rope which is then covered with a heavy-duty polyester braided jacket and coated with bright orange urethane. The primary strands are torque-balanced so that the final rope is "torque-free." The weight of the rope is 22.5 lbs/100 feet or 33.5 kg/100 m. The electric long line is fitted with shielded cable containing 4 (14 AWG) conductors. The weight of the electric conductor is 12.5 lbs/100 feet.

Useful Links to Other Sites

Dyneema fiber at the DSM website

Technora fiber at the Teijin website

Molecular structure of Technora fiber

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