Document r6NQ0LDQ9nz9e6JxQRLbXnjea

HOPES, CHAINS, AND SLINGS TABLE 21-A. BREAKING STRENGTHS AND SAFE LOADS OF MANILA, NYLON, DACRON, POLYPROPYLENE, THREE-STRAND, STANDARD LAY ROPE Piam Cm ) 3/16 1/4 6/16 3/8 7/16 15/32 1/2 9/16 5/8 3/4 13/16 7/8 1 11/18 11/8 11/4 15/16 11/2 16/8 13/4 2 21/8 21/4 21/2 26/8 2 7/8 3 31/4 3 5/8 4 Circum ference (in ) 5/8 3/4 1 11/8 11/4 13/8 11/2 13/4 2 21/4 21/2 23/4 3 31/4 31/2 3 3/4 4 41/2 5 51/2 6 61/2 7 71/2 8 81/2 9 10 11 12 Average weight per 100 ft (pounds) 'Average breaking strength (pounds) Manila Nylon Dacron Polypro Manila Nylon Daeroo Polypro. 16 20 29 41 53 62 76 10 4 133 167 196 226 270 313 360 418 480 600 74 4 896 108 125 146 167 191 215 242 299 367 436 10 16 26 38 54 66 85 106 150 205 270 360 400 460 660 67 0 79 6 900 1100 130 0 1500 165 0 2100 2600 3100 370 0 135 216 31 43 65 71 110 184 265 3 70 82 102 133 17 4 4 75 61 77 110 250 306 15 4 187 405 450 644 670 820 990 117 0 1380 159 0 182 0 2050 2600 315 0 3800 4650 237 272 30 8 390 47 9 683 690 817 935 108 0 1210 137 0 153 0 1910 2320 2750 460 600 1,000 1,350 1,760 2,250 2,660 3,460 4,400 6.400 6,500 7,700 9,000 10,500 12,000 13,500 15,000 18 600 22,500 26,600 31,000 36,000 41.000 46,500 62,000 58.000 64,000 77,000 91,000 105.000 1,100 1,850 2,850 4,000 6 500 860 1,380 2,100 2,950 4,100 800 1300 1,900 2,750 3.600 6,200 8,350 10,500 14 200 5,300 6,800 8,800 12000 4300 6,000 6,600 8300 19 000 18 300 11300 24,600 19,800 14,000 34,000 25,900 18,300 38,000 27,600 20,700 43,000 29300 23,600 55.000 41,400 29,700 64.000 49,800 36300 77,600 61300 43,900 91,000 73.200 53,000 105,000 84.200 62.000 125.000 97300 70,000 145,000 111,000 80300 165.000 123 600 90,000 102,000 205,000 156 000 114,000 250.000 192,000 137.000 300,000 234 000 162,000 350.000 276,000 190,000 *Recommended eafe working load u 20% of the minimum breaking strength. Care of rope Rope should be cleaned before being stored It may be washed with a moderate hose stream, and remaining dirt may be shaken out when the rope has dried Rope deteriorates if saturated with water and not properly dried A wet rope should be hung up or laid in a loose coil in a dry place until it is thoroughly dry A wet rope should never be left where it may freeze Rope should not be left in contact with radiators, steam pipes, or other sources of heat, which may dry out the oil in the fiber Alternate wetting and drying causes more rapid deterioration than constant wetness The use of wet rope or of rope reinforced with metalhc strands near power lines and other electrical equipment is dangerous The adding of twists to rope, or removal of twists, destroys its balance, increased twist also causes a rope to kink Removal of turns in the rope may cause the strands to backtuin, and, if loads are then applied, the rope may be permanently damaged Pe riodic balancing of the twist will lengthen rope life If a fiber rope is well made and given proper care, lubrication other than that 21-3