| |
|
| |
| Data
on commonly used wire rope slings and fittings |
| |
| Penco
slings are constructed to meet nearly every need.
Of course, there are many special situations,
which require the use of a speciality sling.
These are also available when ordering a speciality
sling be sure to consider:
|
 |
Maximum
load |
|
Type
of material to be handled |
|
Condition
of material |
|
Lifting
attachments |
|
Dimensions
of load |
|
Height
of lift |
|
Headroom
and working space available |
|
Distribution
of load weight |
|
Load
center of gravity |
|
Number
of sling legs required |
|
| |
| Ordering
wire rope slings |
| |
| When
ordering slings shown in this catalog the sling
Diameter and length are required unless otherwise
specified; 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. In applications
where corrosion is a factor, Amerian Lifting's Engineering
Department should be consulted before wire rope
is ordered. |
| |
| Rated
capacities |
| |
| Rated
capacities suggested for American 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, alt sling
angles in this catalog are measured from the vertical. |
| |
| 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 specified. |
| |
| Effect
of angles on sling capacities |
| |
|
The rate
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.
|
| |
| Single
Angle |
|
Load
Angle Factor |
| 0(Vertical) |
1.000 |
| 15o |
0.966 |
| 30 |
0.866 |
| 45 |
0.707 |
| 60 |
0.500 |
| 75 |
0.259 |
|
| |
| Example: |
| A
multiple leg sling with a rated capacity of 2000
lb. will have a capacity of 1000 lb. (2000 x 500)
when sling legs |
are
at angle of 60
with vertical |
| |
| Wire
rope sling inspection |
| |
| Conditions
such as the following should be sufficient reasons
for consideration of sling replacement. |
|
|
| 1. |
For strand laid
and single part slings, ten (10) randomly
distributed broken wires in one rope lay.
|
|
|
| 2. |
For cable laid
and baided slings of less than 8 parts, twenty
(20) randomly distributed broken strand per
sling. |
|
|
| 3. |
For
braided slings of 8 parts or more, forty
(40) randomly distributed broken wores in
one braid, or two (2) broken stands per
sling. |
|
|
| 4. |
Seavere localized
abrasion or scraping. |
|
|
| 5. |
Kinking, Crushing,
birdcaging or any other damage resulting in
distorsion of the wire rope structure. |
|
|
|
| 6. |
Evidence
of heat damage or if a wire rope sling having
a fiber core is exposed to temperatures
un excess of |
|
|
| |
200F
if a wire rope sling having a fibre core is
exposed to temperatures in excess of 200F,
or if a wire rope |
| |
sling having
a stell core is used at temperatures above
400F
or below minus 60F.
|
|
|
| 7. |
End attachments
that are cracked, deformed, or worn. |
|
|
| 8. |
Hooks
that have been opened more than 15% of the
normal throat opening measured at the narrowest
point |
| |
or twisted more
than 10o from the plane of the unbent hook. |
|
|
| 9. |
Corrosion of
the rope or end attachments. |
|
|
| 10. |
Unlaying or
opening up of a tucked splice. |
|
