STEEL WIRE ROPE SLINGS
Wire Rope Slings are made
from quality wire ropes and end fittings, These slings are available
against orders only with very short delivery period. Ropes are largely
being converted into slings as slings find variety of applications in
engineering industries, construction and material handling. In addition to
standard slings, tailor made slings are made to cater specific
applications. Slings are usually made out of high tensile ropes to make
them light and incorporate high carrying capacity. Standards are available
for the users to refer for fabrication, installation, usage and
maintenance of slings.
Wire rope consist of
three basic components, while few in number, these vary in both complexity
and configuration so as to produce ropes for specific purposes or
characteristics, The three basic components of a standard wire rope design
1) Wires that form the
2) multi-wire strand: laid helically around a core, and
3) the core
slings are constructed
to meet nearly every need. Of course, there are many special situations,
which require the use of a specialty sling. These are also available when
ordering a specialty sling be sure to consider:
- Maximum load
- Type of material to
- Condition of
- Lifting attachments
- Dimensions of load
- Height of lift
- Headroom and
working space available
- Distribution of
- Load center of
- Number of sling
- Ordering wire rope
When ordering slings
specify the sling Diameter and length are required ; the dimensions and
fittings indicated will be supplied. When variations are necessary full
dimensions must be specified. For example alloy oblong links are standard
or most bridle slings, and these will be supplied unless otherwise
specified. If oblong or pear-shaped carbon Inks are desired, full link
dimensions should be included.
Rated capacities suggested for Lifting slings are based on sound
engineering practices and ample design factors. And are in accordance with
Occupation Safety and Health Administration standards. Rated capacities
are only applicable for new slings under normal conditions. As a standard
practice to avoid confusion.
Wire rope construction
Wire ropes, which are regularly used in Lifting slings, are either 6 x 19
Class 0r 6 x 37 Class. Generally. Ropes with diameters tip to 1 1/8 in.
inclusive are 6 x l9 Class and ropes with larger diameters are 6 x 37
Class. The choice between the two classes may also depend upon the
application of the sling, and the characteristics that are most desirable
in the sling. For example, if resistance to abrasion is of prime
importance, the 6 x 19 Class is chosen because wires of large diameter
provide a high degree of wear resistance. On the other hand, if
flexibility is desired, the 6 x 37 Class is more satisfactory because of
the large number of smaller wires in the rope Other constructions may be
available. but they are rarely used and will not be supplied unless
of lifting angle on Lifting Capacity
capacity of a multiple leg sling is directly affected by the angle of the
sling leg with the vertical. As this angle increases, the stress on each
leg increases with the same load. If the sling angle is known, the
capacity can be readily determined by multiplying the sling's vertical
capacity by the appropriate load angle factor from the table below.
A multiple leg sling with a rated capacity of 2000 Kgs. will have a
capacity of 1000 Kgs. (2000 x 0.500) when sling legs are at angle of 60°
Wire rope sling inspection
Conditions such as
the following should be sufficient reasons for consideration of sling
broken wires in one rope lay.
For cable laid and
braided slings of less than 8 parts, twenty (20) randomly distributed
broken strand per sling.
For braided slings of
8 parts or more, forty (40) randomly distributed broken wires in one
braid, or two (2) broken stands per sling.
abrasion or scraping.
bird caging or any other damage resulting in distortion of the wire
Evidence of heat
damage or if a wire rope sling having a fiber core is exposed to
temperatures un excess of 200°F, if a wire rope sling having a
fiber core is exposed to temperatures in excess of 200oF, or if a wire
rope sling having a steel core is used at temperatures above 400°F or
below minus 60°F.
End attachments that
are cracked, deformed, or worn.
Hooks that have been
opened more than 15% of the normal throat opening measured at the
narrowest point or twisted more than 10° from the plane of the unbent
Corrosion of the rope
or end attachments.
Unlaying or opening
up of a tucked splice.