Compaction Strand Wire Rope Construction(18×K7-WSC)
Product Description
Compaction Strand Wire Rope Construction(18×K7-WSC)
- Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Nominal Diameter | Approx.Weight | Nominal Tensile Strength of Rope (MPA) | ||||||||||||
1570 | 1670 | 1770 | 1870 | 1960 | ||||||||||
Minimum Breaking Load of Rope | ||||||||||||||
FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | |||
mm | kg/100m | KN | ||||||||||||
14 16 18 20 22 24 26 28 | 83.7 190 138 171 207 246 289 335 | 92.1 120 152 188 227 271 318 368 | 108 141 178 220 266 317 371 431 | 114 149 188 232 281 335 393 455 | 115 150 189 234 283 337 395 458 | 121 158 200 247 299 356 418 484 | 121 159 201 248 300 357 419 486 | 128 168 212 262 317 377 443 513 | 128 168 212 262 317 377 442 513 | 136 177 224 277 335 399 468 542 | 134 176 222 274 332 395 464 538 | 142 186 235 290 351 418 490 569 | ||
30 32 34 36 38 40 42 44 46 48 | 384 437 494 553 617 683 753 827 804 984 | 423 481 543 609 679 752 829 910 995 1080 | 495 456 635 712 793 879 969 1060 1160 1270 | 523 595 672 753 839 929 1020 1120 1230 1340 | 526 599 676 758 844 935 1030 1130 1240 1350 | 556 633 714 108 892 989 1090 1200 1310 1420 | 558 634 716 803 895 991 1090 1200 1310 1430 | 589 671 757 849 946 1050 1160 1270 1390 1510 | 589 670 757 848 945 1050 1150 1270 1380 1510 | 623 709 800 897 999 1110 1220 1340 1460 1590 | 617 702 793 889 911 1100 1200 1330 1450 1580 | 653 743 838 940 1050 1160 1280 1400 1530 1670 | ||
50 52 54 56 58 60 | 1070 1150 1250 1340 1440 1540 | 1180 1270 1370 1470 1580 1690 | 1370 1490 1600 1720 1850 1980 | 1450 1570 1690 1820 1950 2090 | 1460 1580 1700 1830 1970 2100 | 1540 1670 1800 1940 2080 2220 | 1550 1680 1810 1940 2080 2230 | 1640 1770 1910 2050 2200 2360 | 1640 1770 1910 2050 2200 2360 | 1730 1870 2020 2170 2330 2490 | 1720 1850 2000 2150 2310 2470 | 1810 1960 2110 2270 2440 2610 |
Note: the minimum aggregate breaking force = minimum breaking load × 1.283.
Hitches
1. Vertical- The Vertical, or straight, attachment is simply using a sling to connect a lifting hook or other device to a load. Full rated load of the sling may be used, but never exceeded. A tagline should be used on such a lift to prevent rotation, which can damage the sling. A wire rope sling with a hand-tucked splice can unlay and fail if the sling is allowed to rotate.
2. Choker- Choker Hitch configurations reduce the rated capacity of a sling by 20 to 25 percent. If a load is hanging free, the normal choke angle is approximately 135°. When the choke angle is less than 120°, an adjustment in the choker rated capacity must be made(see illustration below). Extreme care should be taken to determine the choke angel as accurately as possible. As indicated in the table below, the decrease in rated capacity is dramatic.
Choker Hitch
RATED CAPACITY ADJUSTIMENT
Choke IWRC and Fiber Core Rope
Angle Percent of
(Degrees) Choker Rated Capacity
Over 120 100
90-120 87
60-89 74
30-59 62
Up to 29 49
Angle Adjustment
Rated capacity adjustment for slings in choker hitch when angle is less than 120°. Choke angles greater than 135° are unstable and should not be used.
3. Basket- Basket hitched distribute a load equally between the two legs of a sling, within limitations imposed by the angles at which legs are rigged to the load(see discussion of sling angles).
Basket Hitch
CAPACITY ADJUSTMENT
Angle Percent of Single Leg
(Degrees) Capacity
90 200
60 170
45 140
30 100
Angle
A basket hitch has twice the capacity of a sling leg only if legs of sling are vertical, and only if D/d ratio is 25:1 and it is vertical. D/d>25:1 per ANSI B30.9.
WARNING: Do not use, or allow the use of the products in this catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.
Reeving
Revving through connections to load increases load on connections fitting by as much as twice.
Do not reeve.
Triple and Quad Leg Slings
Triple leg slings have 50% more capacity than double leg only if the center of gravity is in center of connection points and the legs are adjusted properly(equal share of the load)
Quad leg slings offer improved stability but do not provide increased lifting capacity.
Center of Gravity(COG)
The location of the center of gravity to the pick points is an important consideration.
COG and Sling Loading
When lifting vertically, the load will be shared equally if the center of gravity is spaced equally between the pick points, as in the first illustration at right. If the weight of the load is 10,000 lbs., then each sling will have a load of 5,000 lbs. and each shackle and eyebolt will also have a load of 5,000 lbs.
When the center of gravity is not equally spaced between the pick points, as in the second illustration, the slings and fittings will not carry an equal share of the load. The sling connected to the pick point closest to the center of gravity will carry the greatest share of the load. Sling 2 is closest to COG. It will have the greatest share of load.
Sling 2 = 10,000 × 8 /(8+2)= 8,000
Sling 1 = 10,000 × 2 /(8+2)= 2,000
WARNING: Do not use, or allow the use of the products in the catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.
Sling Angle
Sling angle (also called angle of loading) is the angle measured between a horizontal plane and the sling leg or body. This angle is very important and can have a dramatic effect on the rated capacity of the sling (see illustration below) . As illustrated at right, when this angle decreases, the load on each leg increases. This principle applies whether one sling is used to pull at an angle, in a basket hitch, or for multilegged bridge slings. Sling angles of less than 30° shall not be used.
Angles and Load
Angles and Load
Angles and Stress
How do you carry two buckets of water? These illustrations typify the stresses imposed on slings when the legs are attached to the load at various angles.
Load Angle Factor
Sling Angle Load Angle
Degrees(A°) Factor =L/H
90 1.00
60 1.155
50 1.305
45 1.414
30 2.00
LOAD ON EACH LEG OF SLING=
(Load/2)×LOAD ANGLE FACTOR
ANSI B30.9 recommends against the use of a horizontal sling angle smaller than 30°.
WARNING: Do not use, or allow the use of the products in the catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.
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