EVALUATION OF PULLING ROPE WEAR AND COEFFICIENT OF FRICTION FOR PIPE-TYPE CABLES

The coefficient of friction between the pulling rope and cable pipe fo r a high-pressure fluid-filled cable was determined in order to charac terize the effects of pulling tension and sidewall pressure on this pa rameter. Pipe wear was also measured. The study found that variations in pulling tension were more strongly affected by pulling rope wear th an pipe wear. The coefficient of friction of the pulling rope varied f rom 0.27 to 0.75. Pipe wear of 1.52mm (60 mils) was measured during 43 0m (1425 ft.) of pulls at 1414 kgf/m (950 lbs/ft.) sidewall pressure a nd 1.02mm (40 mils) of wear was measured during 290m (950 ft.) of pull s at 610 kgf/m (410 lbs./ft.) sidewall pressure.