Synthetic Slings and Cargo Tie-Down
Assemblies
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PERFORMANCE CHARACTERISTIC
OF WEBBING |
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Nylon |
xxx |
Polyester |
| 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 |
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 |
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 |
x |
Greendale, WI 53129