|
IMPORTANT
WARNINGS AND PROPER CARE OF ROPE
NEVER EXCEED THE WORK LOAD
LIMIT OF ROPE
Use Work Load Limits as guidelines only. Work Load Limit
may have to be reduced when life, limb or valuable property
are at risk, or other than new rope is used. When using
multiple leg rope slings, the Work Load Limit of each
leg will have to be reduced considerably. Consult industry
recommendations for information. Work Load Limit does
not apply if rope has been subjected to severe dynamic
loading, which may not be visible.
AVOID
OVERHEATING
Exposure to high temperatures will cause ropes to lose
strength rapidly. Even temperatures as low as 150' F
(66' C) can reduce the strength of some ropes by 50%.
When using synthetic rope, be careful to avoid excessive
friction which heats, melts and fuses the outer fibers
of the rope.
KEEP
OUT FROM UNDER A RAISED LOAD
Never stand in the line of rope under strain - if rope
breaks, it will recoil with considerable force.
AVOID
SHOCK LOADS
Rope that is strong enough to withstand a steady pull
can be broken with a sudden jerk. Be aware of all possible
dynamic loading situations. Avoid them when possible
and allow for strong enough rope when they cannot be
avoided.
DESTROY,
RATHER THAN DISCARD, ROPE TO BE RETIRED
It might be used again by someone not aware of the hazard
of the defect. This is best achieved by cutting it up
into short pieces.
AVOID
ABRASION AND UNNECESSARY WEAR
Outer fibers as well as inner fibers contribute to a
rope's strength. When outer fibers are worn by chafing
or dragging over splintered, buried, rough or gritty
surfaces, the rope is worn and weakened.
AVOID
SUSTAINED LOADS
Natural fiber ropes such as Manila and Sisal have less
ability to take sustained loads than synthetic fiber
ropes such as nylon or polypropylene. Never exceed the
Work Load Limit and do not subject fiber rope to sustained
loads.
AVOID
RUST
Rust can cause rapid loss of strength, sometimes in
as short a time as one to two weeks.
KEEP
ROPE AWAY FROM CHEMICALS
Strong acids, alkalis and solvents can damage any rope.
Natural fiber rope is extremely vulnerable to all
chemicals and solvents.
AVOID
THE USE OF SWIVELS IN ROPES UNDER LOAD
A loss of turn will cause permanent damage to the rope.
NEVER
USE A NYLON LINE WHICH HAS A HIGH STRETCH FACTOR IN
COMBINATION WITH ANOTHER ROPE OF LOW STRETCH.
The nylon line will stretch and not carry its proportionate
share of the load, thus putting extra strain on the
other lines.
STORE
ROPE PROPERLY
Rope is best stored in a dry, unheated place where air
circulates freely, off the floor, and away from direct
sunlight and other contact with the elements. Keep in
mind that synthetic ropes will deteriorate in direct
sunlight due to
the exposure to ultraviolet radiation.
KEEP
ROPE CLEAN
Dirt on the surface of rope can become imbedded inside
and act as an abrasive on fibers.
DO
NOT EXCEED WORK LOAD LIMIT OR 20% OF THE PRODUCT'S BREAK
STRENGTH.
ROPE
FIBER COMPARISON
WARNING:
This guide is designed for GENERAL REFERENCE ONLY. The
construction comparisons assume using the same rope
fiber and size. Expert advice should be sought when
choosing a rope where protection of life or property
is involved.
| ROPE
CONSTRUCTION SELECTION GUIDE |
|
Characteristics
|
Solid
Braid |
Hollow
Braid |
Double
Braid |
Maypole/
Diamond Brain |
Twisted |
| Number
of starnds or carriers |
9,
12, or 18 |
8,
12, or 16 |
16,
20, 24, OR 32 |
8,
12, OR 16 |
3 |
| Spliceable |
NO |
YES
|
YES |
NO |
YES |
| Strength
to weight (Best-1, poorest-5) |
5
|
1
|
2
|
4 |
3 |
| Flexibility
(Best-1, Poorest-5) |
3
|
1
|
2 |
4 |
5
|
| Flattens
under load |
NO |
YES |
NO
|
YES
|
NO |
| Rotates
under load |
NO
|
NO
|
NO
|
NO
|
YES |
| Mechanical
elongation (High-1, Low-5) |
1
|
4
|
5
|
3
|
2 |
| Cost
per size (High-1, Low-5) |
2
|
4
|
1 |
3 |
5 |
| Working
Load (% of tensile) |
5-20% |
5-20% |
5-20% |
5-20% |
5-20% |
| Abrasion
Resistance (Best-1, Poorest-5) |
1
|
5
|
2
|
3
|
5 |
 |
| FIBER
TYPE |
Nylon |
Polyester |
Polypropylene |
Manila |
| Strength
(Best-1, Poorest-5) |
1
|
2
|
3
|
4
|
| Wet
Strength vs. Dry Strength |
85%
|
100%
|
100%
|
115%
|
| Shock
Load Ability (Best-1, Poorest-5) |
1
|
3
|
2
|
4 |
| Floats
or Sinks in Water |
Sinks
|
Sinks |
Floats |
Sinks |
| Elongation
at Break (Approximate) |
20%-34%
|
15%-20%
|
15%-20%
|
10%-15%
|
| Water
Absorption |
6%
|
<1%
|
Zero
|
100% |
| Melting
Point |
480°F
|
500°F
|
330°F |
Does Not Merit Chars
at 350° F |
| Abrasion
Resistance (Best-1, Poorest-5) |
2
|
1
|
4
|
3 |
| Degradation:
Resistance to Sunlight |
Good
|
Excellent
|
Poor
|
Good |
Degradation:
Resistance to Rot
|
Excellent
|
Excellent
|
Excellent
|
Poor
|
| Degradation:
Resistance to Acids |
Poor
|
Good
|
Good
|
Poor |
| Degradation:
Resistance to Alkalis |
Good
|
Poor
|
Good
|
Poor |
| Degradation:
Resistance to Oil & Gas |
Good
|
Good
|
Good
|
Poor |
| Electrical
Conductivity Resistance |
Poor
|
Good
|
Good
|
Poor |
| Flexing
Endurance (Best-1, Poorest-5) |
1
|
2
|
3
|
4 |
| Specific
Gravity |
1.14
|
1.38
|
.90
|
1.38 |
| Storage
Requirements |
Wet
or Dry |
Wet
or Dry |
Wet
or Dry |
Dry
Only |
|