The properties of fiber-rope hawsers used to moor tankers to single-point moorings (SPM) were studied in the late 1970s and early 1980s. It was found that wet nylon rope had a relatively short cyclic fatigue life. Marine yarn finishes, however, greatly improved nylon rope's fatigue characteristics. SPM hawsers typically have a life of one to two years when left floating in the sea and up to five years when used on the stern of a tandem offtake if stored on a reel. However, due to short fatigue life, nylon cannot be designed for permanent moorings of around a 20-year life.
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