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Synthetic Slings and Cargo Tie-Down
Assemblies
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PERFORMANCE CHARACTERISTIC
OF WEBBING
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Nylon
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Polyester
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| The most widely used general
purpose synthetic web sling, is unaffected by grease and oil. It
has good chemical resistance to aldehydes, ethers, and strong alkalies,
but is not suitable for use with acids and bleaching agents or at temperatures
in excess of 194 degrees F (90° C). Stretch at rated capacity
is approximately 8-10%. |
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Used mainly where acid conditions
are present or a minimum stretch is desired, polyester is unaffected by
common acids and hot bleaching agents. It is not suitable for use
with concentrated sulfuric acids, alkaline or at temperatures in excess
of 194 degrees F (90° C). Stretch at rated capacity is approximately
3% (untreated). |
* Disintegrated by concentrated
sulfuric acid.
** Degraded by strong
alkalies at elevated temperatures.
For specific temperature,
concentration and time factors, please consult Safeway Sling
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When you lift a load with a
leg or legs of a sling at an angle,
you can calculate the load
per leg and the slings rated capacity by using the following formula example:
1. Total Load is 1,000 lbs.,
divided by 2 legs = 500 lbs (load per leg)
2. Suppose sling angle is
60°
3. Multiple 500 lbs. x 1.154
(load factor from table) = 577 lbs. (actual load per leg)
You will need a sling rated
at 1154 lbs in basket capacity to safety lift this 1,000 lb. load. |
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Inspection Frequency
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Three important factors
need to be reviewed to determine your sling inspection frequency:
 Sling
Usage: The more frequently a sling is used, the more often it requires
inspection.
Use
Environment: The harsher the working environment the sling is
used in, the more often it requires inspection.
Sling
Service Life: Base your conclusions on your previous experience
in using slings.
The individual handling
your slings should visually inspect all slings before each lift.
Additional inspections should be made at least once a year by a qualified
individual, and permanent records should be kept. OSHA mandates that
"Each day before being used, the sling and all fastenings and attachments
shall be inspected for damage or defects by a competent person designated
by the employer. Additional inspections shall be performed during
sling use, where service conditions warrant." |
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Replacement Guidelines
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If you see damage such as
the following listed below, remove slings (including round slings) immediately
from service. Return them to service only when approved by a qualified
individual. Following are the removal criteria established by ANSI
B30.9:
1. Acid
or caustic burns.
2. Melting
or charring of any part of the sling.
3. Holes,
tears, cuts or snags.
4. Broken
or worn stitching in load-bearing splices.
5. Excessive
abrasive wear.
6. Knots
in any part of the sling.
7. Excessive
pitting or corrosion, or cracked, distorted or broken fittings.
8. Other
visible damage that causes doubt as to the strength of the sling.
In addition, Safeway Sling
USA recommends four other important reasons to remove slings from service;
1. If
you see our Red Core warning yarns.
2. Distortion
of the sling.
3. The
sling has an identification tag that is in anyway unreadable.
4. Anytime
a sling is loaded beyond its rated capacity, for any reason.
While these standards are
quite specific regarding reasons for removal, others require your good
judgement and common sense. Critical areas to watch are wear to the
body of the sling, the selvage edge of the webbing, and the condition of
the eyes. |
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Samples of Hitches
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Greendale, WI 53129 
