Rotation-resistant wire ropes are specially designed to re-sist spin or rotation while under load.
Due to their design, they have certain restrictions on their application and special handling requirementsthat are unnecessary with other constructions
The rotation-resistant characteristics are attained by a design of two or more layers of strands having differing (right and left) directions of lay, as shown
Under load, one layer’s directional rotation is counteracted by the tendency of the other layer(s) to rotate in the opposite direction. To impart greater resistance to rotation, these ropes are designed with a greater number of smaller diameter strands (when compared with the design of 6- strand constructions).
The combination of smaller diameter strands and differing rope lays makes for a very delicate balance which can easily be “unbalanced” at anytime.
Detail of 18-7
Detail of 35W-7
Detail of 18-7
Construction |
||||||||||
Nominal Diameter |
Approximate Weight |
Minimum Breaking Load Corresponding To Rope Grade Of |
||||||||
Fiber Core |
Steel Core |
1570 |
1770 |
1960 |
2160 |
|||||
FC |
IWS |
FC |
IWS |
FC |
IWS |
FC |
IWS |
FC |
IWS |
|
MM |
KG/100M |
KG/100M |
KN |
KN |
KN |
KN |
KN |
KN |
KN |
KN |
6 |
14 |
15.5 |
17.5 |
18.5 |
19.8 |
20.9 |
21.9 |
23.1 |
24.1 |
25.5 |
7 |
19.1 |
21.1 |
23.8 |
25.2 |
26.9 |
28.4 |
29.8 |
31.5 |
32.8 |
34.7 |
8 |
25 |
27.5 |
31.1 |
33 |
35.1 |
37.2 |
38.9 |
41.1 |
42.9 |
45.3 |
9 |
31.6 |
34.8 |
39.4 |
41.7 |
44.4 |
47 |
49.2 |
52.1 |
54.2 |
57.4 |
10 |
39 |
43 |
48.7 |
51.5 |
54.9 |
58.1 |
60.8 |
64.3 |
67 |
70.8 |
11 |
47.2 |
52 |
58.9 |
62.3 |
66.4 |
70.2 |
73.5 |
77.8 |
81 |
85.7 |
12 |
56.2 |
61.9 |
70.1 |
74.2 |
79 |
83.6 |
87.5 |
92.6 |
96.4 |
102 |
13 |
65.9 |
72.7 |
82.3 |
87 |
92.7 |
98.1 |
103 |
109 |
113 |
120 |
14 |
76.4 |
84.3 |
95.4 |
101 |
108 |
114 |
119 |
126 |
131 |
139 |
16 |
99.8 |
110 |
125 |
132 |
140 |
149 |
156 |
165 |
171 |
181 |
18 |
126 |
139 |
158 |
167 |
178 |
188 |
197 |
208 |
217 |
230 |
20 |
156 |
172 |
195 |
206 |
219 |
232 |
243 |
257 |
268 |
283 |
22 |
189 |
208 |
236 |
249 |
266 |
281 |
294 |
311 |
324 |
343 |
24 |
225 |
248 |
280 |
297 |
316 |
334 |
350 |
370 |
386 |
408 |
26 |
264 |
291 |
329 |
348 |
371 |
392 |
411 |
435 |
453 |
479 |
28 |
306 |
337 |
382 |
404 |
430 |
455 |
476 |
504 |
525 |
555 |
30 |
351 |
387 |
438 |
463 |
494 |
523 |
547 |
579 |
603 |
638 |
32 |
399 |
440 |
498 |
527 |
562 |
594 |
622 |
658 |
686 |
725 |
34 |
451 |
497 |
563 |
595 |
634 |
671 |
702 |
743 |
774 |
819 |
36 |
505 |
557 |
631 |
667 |
711 |
752 |
787 |
833 |
868 |
918 |
38 |
563 |
621 |
703 |
744 |
792 |
838 |
877 |
928 |
967 |
1020 |
40 |
624 |
688 |
779 |
824 |
878 |
929 |
972 |
1030 |
1070 |
1130 |
42 |
688 |
759 |
859 |
908 |
968 |
1020 |
1070 |
1130 |
1180 |
1250 |
44 |
755 |
832 |
942 |
997 |
1060 |
1120 |
1180 |
1240 |
1300 |
1370 |
Detail of 35W-7
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