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Published byCarla Smallridge Modified over 2 years ago

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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 Capacity Reduction Factor (Cosine) 1.00.996.985.966.940.906.866.819.766.707.643.574.500.423.342.259.174.087.000 Rated Capacities – Tons, 2000lbs S/F 5 to 1 Rope Dia.VERTICAL Inches 1 9.8 1 1/8 12 1 ¼ 15 1 3/8 18 1 ½ 21 1 5/8 24 1 ¾ 28 2 37 2 ¼ 46 2 ½ 56

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DEGREECOSINE ÷ TANGENT × 30° 35° 45° 50° 55° 60°.8660.81915.7071.64278.57357.50.5774.70020 1.00 1.19175 1.42814 1.73205

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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 1.13 = 7,433.63 lbs = NO 7/8" SPA v/s FTO 3 SWL 8,400 lbs E = 2.28" ECW DIA. SQ. 1.71 X.875 = 1.50 LOAD 8,400 lbs divide 1.50 = 5,600 lbs = YES 2" SPA v/s FT010 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 2" SPA v/s FHPZ60 SWL 60,000 lbs. = E = 5.25 Underload = 4' = Yes Note: High performance sling shall not exceed E dimension under load

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Strength Loss of Wire Rope Over Stationary Sheaves or PinsRope 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.

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