| Introduction
to Nylon Web Slings |
• Care
& Use of Nylon Web Slings
• Rated Capacities
of Nylon Web Slings
Synthetic web slings are generally constructed
of nylon, or less frequently, polyester material and offer several
attractive features which promote their popularity among rigging pro-ducts.
They are often selected when expensive, highly polished, fragile or
delicate loads must be lifted. The softness of the web will not mar,
deface or scratch loads, while its flexibility assures a firm, secure
grip around the item being lifted. The light weight of the material,
combined with superb flexibility allow the slings to be quickly and
safely handled by riggers.
Web slings have the ability to elongate, absorbing and minimizing
the effects of heavy shock loads. Nylon slings may stretch 6-8% at
rated capacity, while polyester slings limit stretch to approximately
3% under similar circumstances. Long life cycles may be experienced
since synthetic web is unaffected by moisture, mildew, rot and certain
chemicals. Polyester should be used in the presence of acids and nylon
should be used where alkalis exist.
Synthetic web slings are manufactured from light or heavy duty material
that has been surface "treated" to improve abrasion resistance,
seal out moisture, and prevent grit from penetrating the web and causing
internal wear. Slings can be fabricated from single or multiple plies,
may include accessories such as edgeguard, wear pads or sleeves, and
are available in several configurations: |
Type 1 : Triangle & Choker
(TC) - Hardware on each end produces the most effective choker hitch.
Can also be used in vertical and basket hitches. |
|
Type 2 : Triangle & Triangle
(TT) - Hardware on each end for use in basket or vertical hitch. |
|
Type 3 : Flat Eye & Eye
(EE) - Popular, versatile sling used in vertical, choker & basket
hitches. Easy to remove from underneath loads. |
|
Type 4 : Twisted Eye &
Eye (EE) - Eyes turned at a right angle to sling body. Forms superior
choker hitch & allows better fit on crane hook in basket hitch. |
|
Type 5 : Endless (EN) - Economical
& adaptable sling with no fixed wear points. Used in all hitches. |
|
Type 6 : Reversed Eye (RE)
- Extremely strong & durable for continuous &/or abusive applications.
Wear pads on both sides of body. |
|
The following system is used to identify different types of web slings:
|
|
|
Therefore
an EE1-802 is a heavy duty, 2" wide, single ply Eye & Eye
sling. Relative to other types of slings, web slings are best in strength/weight
ratio, poorest in abrasion and cut resistance, excellent with regard
to flexibility and elongation, and poor in temperature extremes.
|
| Every
Lift Uses 1 of 3 Basic Hitches |
 |
Vertical Hitch
This hitch is made directly from the crane hook
to the load, usually attached by means of a hook.
|
 |
Choker Hitch
The sling passes entirely around the load with
one loop passing through the other to form a slip noose or "choker". |
 |
Basket Hitch
This hitch is made by passing the sling under
the load and having both eyes going to the crane hook. |
|
