Steel Wire Rope Construction(6×7+FC)

Steel Wire Rope Construction(6×7+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)
2	1.40	1.38	1.55	2.08	2.25	2.22	2.4	2.35	2.54	2.48	2.69	2.6	2.81
3	3.16	3.10	3.48	4.69	5.07	4.99	5.4	5.29	5.72	5.59	6.04	5.86	6.33
4	5.62	5.50	6.19	8.34	9.02	8.87	9.59	9.4	10.2	9.93	10.7	10.4	11.3
5	8.78	8.60	9.68	13	14.1	13.9	15	14.7	15.9	15.5	16.8	16.3	17.6
6	12.6	12.4	13.9	18.8	20.3	20	21.6	21.2	22.9	22.4	24.2	23.4	25.3
7	17.2	16.9	19	25.5	27.6	27.2	29.4	28.8	31.1	30.4	32.9	31.9	34.5
8	22.5	22.0	24.8	33.4	36.1	35.5	38.4	37.6	40.7	39.7	43	41.7	45
9	28.4	27.9	31.3	42.2	45.7	44.9	48.6	47.6	51.5	50.3	54.4	52.7	57
10	35.1	34.4	38.7	52.1	56.4	55.4	60	58.8	63.5	62.1	67.1	65.1	70.4
11	42.5	41.6	46.8	63.1	68.2	67.1	72.5	71.1	76.9	75.1	81.2	78.7	85.1
12	50.5	49.5	55.7	75.1	81.2	79.8	86.3	84.6	91.5	89.4	96.7	93.7	101
13	59.3	58.1	65.4	88.1	95.3	93.7	101	99.3	107	105	113	110	119
14	68.8	67.4	75.9	102	110	109	118	115	125	122	132	128	138
16	89.9	88.1	99.1	133	144	142	153	150	163	159	172	167	180
17	101	99.4	112	151	163	160	173	170	184	179	194	188	203
18	114	112	125	169	183	180	194	190	206	201	218	211	228
20	140	138	155	209	225	222	240	235	254	248	269	260	281
22	170	167	187	252	273	268	290	284	308	300	325	315	341
24	202	198	223	300	325	319	345	338	366	358	387	375	405
26	237	233	262	352	381	375	405	397	430	420	454	440	476
28	275	270	303	409	442	435	470	461	498	487	526	510	552
30	316	310	348	469	507	499	540	529	572	559	604	586	633
32	359	352	396	534	577	568	614	602	651	636	687	666	721
34	406	398	447	603	652	641	693	679	735	718	776	752	813
36	455	446	502	676	730	719	777	762	824	805	870	843	912
38	507	497	559	753	814	801	866	849	918	896	969	940	1020
40	562	550	619	834	902	887	959	940	1020	993	1070	1040	1130
42	619	607	683	919	994	978	1060	1040	1120	1100	1180	1150	1240
44	680	666	749	1010	1090	1070	1160	1140	1230	1200	1300	1260	1360
46	743	728	819	1100	1190	1170	1270	1240	1340	1310	1420	1380	1490
48	809	793	892	1200	1300	1280	1380	1350	1460	1430	1550	1500	1620
50	878	860	968	1300	1410	1390	1500	1470	1590	1550	1680	1630	1760

   

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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