Table One Sling Capacity Reduction Factors Largest Angle

Table One – Sling Capacity Reduction Factors Largest Angle Any Leg At Horizontal 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Rated Capacities – Tons, 2000 lbs S/F 5 to 1 Rope Dia. VERTICAL Inches 1 9. 8 1 1/8 12 1¼ 15 1 3/8 18 1½ 21 1 5/8 24 1¾ 28 2 37 2¼ 46 2½ 56 Capacity Reduction Factor (Cosine) 1. 00. 996. 985. 966. 940. 906. 866. 819. 766. 707. 643. 574. 500. 423. 342. 259. 174. 087. 000

DEGREE COSINE ÷ TANGENT × 30° . 8660 . 5774 35° . 81915 . 70020 45° . 7071 1. 00 50° . 64278 1. 19175 55° . 57357 1. 42814 60° . 50 1. 73205

7, 000 lbs Poly - Yarn PSI Max Effective Contact With Bow Shackles. 75% - ECW 3 ¼ " SPA v/s FTO 3 SWL 8, 400 lbs E = 2" ECW DIA. SQ. 1. 50 X. 75 = 1. 13 LOAD 8, 400 lbs divide 1. 50 = 5, 600 lbs = YES 2" SPA v/s FT 010 SWL 66, 000 lbs E = 5. 75" ECW DIA. SQ. 4. 32 X 2 = 8. 64 LOAD 66, 000 lbs divide 8. 64 = 7, 638. 89 lbs = NO 8, 400 lbs divide 1. 13 = 7, 433. 63 lbs = NO 7/8" SPA v/s FTO 3 SWL 8, 400 lbs 2" SPA v/s FHPZ 60 SWL 60, 000 lbs. = E = 5. 25 Underload = 4' = Yes E = 2. 28" Note: High performance sling shall not exceed E dimension under load ECW DIA. SQ. 1. 71 X. 875 = 1. 50 LOAD

Strength Loss of Wire Rope Over Stationary Sheaves or Pins Rope breaking strength is determined in a standard test wherein fittings are attached to the ends of the rope and the rope is pulled in a straight line. If, however, the rope passes over a curved surface (such as a sheave or pin) its strength "is decreased. " The amount of such reduction will depend on the severity of the bend as expressed by the D/d ratio. For example, a rope bent around a pin of its own diameter will have only 50% of the strength attributed to it in the standard test. This is called "50% efficiency" (Fig. 38). Even at D/d ratios of 40, there may be a loss of up to 5%. At smaller D/d ratios, the loss in strength increases quite rapidly. The angle of bend need not be 180º, 90º, or even 45º; relatively small bends can cause considerable loss. All discussion of strength pre-supposes a gradually applied load not to exceed one inch per minute.