Line Contacted Wire Rope Construction (6×19S+FC)

Line Contacted Wire Rope Construction (6×19S+FC)
- 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
D	NF	SF	IWR/IWS	FC	IWR/IWS	FC	IWR/IWS	FC	IWR/IWS	FC	IWR/IWS	FC	IWR/IWS
mm	kg/100m			(KN)
5	9.22	9	10.1	13	14	13.8	14.9	14.6	15.8	15.4	16.6	16.2	17.4
6	13.3	13	14.6	18.7	20.1	19.8	21.4	21	22.7	22.2	24	23.3	25.1
7	18.1	17.6	19.9	25.4	27.4	27	29.1	28.6	30.9	30.2	32.6	31.7	34.2
8	23.6	23	25.9	33.2	35.8	35.3	38	37.4	40.3	39.5	42.6	41.4	44.7
9	29.9	29.1	32.8	42	45.3	44.6	48.2	47.3	51	50	53.9	52.4	56.5
10	36.9	36	40.5	51.8	55.9	55.1	59.5	58.4	63	61.7	66.6	64.7	69.8
11	44.6	43.5	49.1	62.7	67.6	66.7	71.9	70.7	76.2	74.7	80.6	78.3	84.4
12	53.1	51.8	58.4	74.6	80.5	79.4	85.6	84.1	90.7	88.9	95.9	93.1	101
13	62.3	60.8	68.5	87.6	94.5	93.1	101	98.7	107	104	113	109	118
14	72.2	70.5	79.5	102	110	108	117	115	124	121	131	127	137
15	82.9	81	91.2	117	126	124	134	131	142	139	150	146	157
16	94.4	92.1	104	133	143	141	152	150	161	158	170	166	179
18	119	117	131	168	181	179	193	189	204	200	216	210	226
19	133	130	146	187	202	199	215	211	228	223	240	234	252
20	147	144	162	207	224	220	238	234	252	247	266	259	279
22	178	174	196	251	271	267	288	283	305	299	322	313	338
24	212	207	234	298	322	317	342	336	363	355	384	373	402
26	249	243	274	350	378	373	402	395	426	417	450	437	472
28	289	282	318	406	438	432	466	458	494	484	522	507	547
30	332	324	365	466	503	496	535	526	567	555	599	582	628
32	377	369	415	531	572	564	609	598	645	632	682	662	715
34	426	416	469	599	646	637	687	675	728	713	770	748	807
36	478	466	526	672	724	714	771	757	817	800	863	838	904
38	532	520	586	748	807	796	859	843	910	891	961	934	1010
40	590	576	649	829	894	882	951	935	1010	987	1070	1030	1120
42	650	635	715	914	986	972	1050	1030	1110	1090	1170	1140	1230
44	714	697	785	1000	1080	1070	1150	1130	1220	1190	1290	1250	1350
46	780	762	858	1100	1180	1170	1260	1240	1330	1310	1410	1370	1480
48	849	829	934	1190	1290	1270	1370	1350	1450	1420	1530	1490	1610
50	922	900	1010	1300	1400	1380	1490	1460	1580	1540	1660	1620	1740
52	997	973	1100	1400	1510	1490	1610	1580	1700	1670	1800	1750	1890
54	1080	1050	1180	1510	1630	1610	1730	1700	1840	1800	1940	1890	2030
56	1160	1130	1270	1620	1750	1730	1860	1830	1980	1940	2090	2030	2190
58	1240	1210	1360	1740	1880	1850	2000	1960	2120	2080	2240	2180	2350
60	1330	1300	1460	1870	2010	1980	2140	2100	2270	2220	2400	2330	2510
62	1420	1380	1560	1990	2150	2120	2290	2250	2420	2370	2560	2490	2680
64	1510	1470	1660	2120	2290	2260	2440	2390	2580	2530	2730	2650	2860
66	1610	1570	1770	2260	2430	2400	2590	2540	2740	2690	2900	2820	3040
68	1700	1660	1870	2400	2580	2550	2750	2700	2910	2850	3080	2990	3230
70	1810	1760	1990	2540	2740	2700	2910	2860	3090	3020	3260	3170	3420
72	1910	1870	2100	2690	2900	2860	3080	3030	3270	3200	3450	3350	3620
74	2020	1970	2220	2840	3060	3020	3260	3200	3450	3380	3650	3540	3820
76	2130	2080	2340	2990	3230	3180	3430	3370	3640	3560	3850	3740	4030
78	2240	2190	2470	3150	3400	3350	3620	3550	3830	3750	4050	3940	4250
80	2360	2300	2590	3320	3580	3530	3800	3740	4030	3950	4260	4140	4470

 

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 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°.

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