|
!!WARNING!!
The capacity of a sling to lift weight
DECREASES as the angle of the sling moves
away from being vertical. If the angle
of the sling is not taken into consideration
before selecting a sling to lift a load,
SERIOUS INJURY OR DEATH COULD RESULT from
the load being dropped
|
Sling Angle Capacities
If you know the lifting angle of the sling being
used, you can apply the Capacity Reduction Factor
A or the Load Multiplier B in the Sling Angle
chart. If you don't know the angle:
Attach the sling(s)
Apply lift until the slings are taut and the
load is ALMOST ready to leave the ground (BUT
DO NOT LIFT THE LOAD OFF THE GROUND!!)
Measure the length of the sling between the
lift point and the load
Measure the height between the lift point and
the load (see Fig. 1 below)
|
SLING ANGLE CHART
|
|
Angle
from
Horizontal
|
A
Capacity
Reduction
Factor
|
B
Load
Multiplier
|
|
90
|
1.00
|
1.00
|
|
85
|
.996
|
1.005
|
|
80
|
.985
|
1.016
|
|
75
|
.966
|
1.036
|
|
70
|
.940
|
1.064
|
|
65
|
.906
|
1.104
|
|
60
|
.866
|
1.155
|
|
55
|
.819
|
1.222
|
|
50
|
.766
|
1.306
|
|
45
|
.707
|
1.415
|
|
40
|
.643
|
1.556
|
|
35
|
.574
|
1.743
|
|
30
|
.50
|
2.00
|
Situation 1
Capacity Reduction Factor |
Situation 2
Load Multiplier |
When you know the appropriate
rated capacity of the sling, and you need
to calculate its actual capacity (based
on the sling angle), follow the instructions
below: (The example uses a measured length
of 12 feet and a measured height of 8 feet.)
Measured Length (L): 12 feet
Measured Height (H): 8 feet
Reduction Factor (RF) = H/L=8/12 = 0.667
Rated Capacity* of sling = 1,000 lbs.
Actual Capacity of sling = Rated Capacity
x RF =
1,000 X 0.667 = 677 lbs. |
When you know the actual weight
of the load, and you need to calculate the
appropriate rated capacity (based on the
sling angle) of the sling to lift the load,
follow the instructions below: (The example
uses a measured length of 12 feet and a
measured height of 8 feet.)
Measured Length (L): 12 feet
Measured Height (H): 8 feet
Load Multiplier (LM) =L/H=12/8 = 1.5
Load weight: 1000 lbs.
Necessary Rated Capacity* of sling = Load
Weight x LM =
1,000 X 1.5 = 1,500 lbs. |
| Example: Polyester Roundsling
size no. 1(purple) without fittings, 5,200
lb. vertical basket hitch rating used in
a basket hitch at a 60° angle. |
 |
|
5200 lbs
|
X
|
0.866
|
=
|
4500 lb Rated Capacity
|
|
Roundsling Rating
Vertical Basket
|
|
Factor from
Sling Angle Chart
|
|
Rated Capacity
|
|
Inspection Criteria
for Twintex® Roundslings
|
| Remove from Service
When: |
| *Cuts to sling cover expose red-striped
white core yarns |
| *Holes, tears, snags or abrasions expose
red-striped white core yarns |
| *End fittings are pitted or corroded,
cracked, distorted or broken |
| *The sling shows signs of melting, charring,
or chemical damage |
| *Capacity tag is illegible or missing
|
| *Other visible damage which causes doubt
as to the strength of the sling |
| *Note: Do not expose roundslings to temperatures
exceeding 194° F. |
|
|
Chemical
Resistance Chart
|
| Chemical |
Polyester |
Nylon |
| Acid |
* |
NO |
| Alcohols |
OK |
OK |
| Aldehydes |
NO |
OK |
| Strong Aldihydes |
** |
OK |
| Bleaching Agents |
OK |
NO
|
| Dry Cleaning Solvents |
OK |
OK |
| Ethers |
NO |
OK |
| Halogenated Hydrocarbons |
OK |
OK |
| Hydrocarbons |
OK |
OK |
| Ketones |
OK |
OK |
| Oils, Crude |
OK |
OK |
| Oils, Lubricating |
OK |
Ok |
| Soap and detergents |
OK |
OK |
| Water and Seawater |
OK |
OK |
| Weak Alkalis |
OK |
OK |
|
THIS
IS A GENERAL GUIDELINE ONLY
|
| *Disintegrated by concentrated
sulphuric acid |
| **Degraded by strong alkalis
at elevated temperatures |
|
| |
|
