Emerging technology: DPX jacketed mooring lines

The use of high modulus polyethylene (HMPE) fiber is gaining popularity in the cordage industry due to such excellent properties as high strength, low weight, fatigue resistance, and UV resistance. However, the low coefficient of friction (COF) of HMPE fiber presents a challenge when used on winches, capstans, H-bitts and other types of hardware that rely on friction for proper performance. Another challenge preventing some users from switching to synthetic rope is the rough condition of equipment that has deteriorated due to many years of wire rope use. Better protection of the strength member can extend the life of a synthetic line. Samson engineering has developed a blended yarn, DPX, to significantly change the surface characteristics of traditional HMPE ropes. DPX is a unique blend of Dyneema® fiber and polyester that provides a "pre-fuzzed" appearance and grips better than any HMPE fiber. This paper discusses the characteristics and performance improvements achieved using DPX fiber technology, the supporting lab data and field evaluation results.