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3.1
Rope information
USE ONLY LOW STRETCH 12 OR 13 MM ( 1/2'' ) DIAMETER
PORTABLE WINCH CO. DOUBLE BRAIDED POLYESTER
ROPE WITH A MINIMAL BREAKING POINT OF 3150 KG
( 6945 LB ) WITH THIS WINCH. PLEASE CONTACT US FOR
OTHER ROPE TYPE'S SUITABILITY.
DO NOT USE 3-STRAND POLYPROPYLENE YELLOW
ROPE!
POLYPROPYLENE AND POLYETHYLENE ROPES ARE DANGEROUS FOR
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WINCHING BECAUSE OF THEIR GREAT ELASTICITY AND LOW MELT POINT.
MAKE SURE THE ROPE IS NOT DAMAGED AND THAT IT OFFERS AN
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ADEQUATE RESISTANCE TO PULL THE LOAD.
STRETCH = DANGER!
A STRETCHED ROPE CAN RECOIL AND CAUSE SERIOUS BURNS AS THE ROPE
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LEAVES YOUR HAND.
ALL ROPES STRETCH: A LONGER ONE MORE THAN A SHORTER ONE. THE
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MORE YOU PULL, THE MORE IT STRETCHES.
A STRETCHED ROPE CAN ALSO MOVE THE LOAD IN AN UNPREDICTABLE OR
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DANGEROUS WAY.
A STRETCHED ROPE CAN RECOIL AND BRING YOUR HAND TOWARDS THE
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WINCH CAUSING SEVERE INJURIES. NEVER WRAP THE ROPE AROUND YOUR
HAND.
ALWAYS WEAR GLOVES.
3.1.1
Rope usage
Use rope properly; do not abuse or shock load it. Observe
recommended usage factors for bending and work loads. Keep
ropes clean and eliminate abrasion whenever possible.
1) Working loads are the loads that a rope is subjected to in
everyday activity. For lifting purposes we recommend a
minimum safety factor of 7 (app. 15% of the rope minimum
break strength) when the rope has a spliced termination. If the
rope is knotted with a bowline, we recommend a safety factor
of 10.
2) Any sharp bend in a rope under load decreases rope strength
substantially and may cause permanent damage and failure.
Sheave diameters should be 8 times the rope diameter.
3) Knots are known to reduce rope strength but they are a
convenient way to accomplish rope attachment. The strength
loss is a result of the sharp bends that occur in the knots. If you
must use a knot, use the bowline or double bowline
described in section 3.1.3.
4) Keep rope clean and as dry as possible. Grit and dirt will work
its way inside the rope and degrade it rapidly. You can wash it
in the washing machine and hang to dry.
5) Store the rope in a rope bag or in a pail. Coiling the rope will
induce twists and knots.
6) Shock loads are a sudden change in tension from a relaxed
state or low load to one of high load. Any sudden load that
exceeds the work load by more than 10% is considered a
shock load. The further an object falls, the greater the impact.
Synthetic fibers have a memory and retain the effects of being
overloaded and can fail at a later time even though loaded
within the work load range.
3.1.2
Rope inspection and maintenance
VISUALLY INSPECT YOUR ROPE BEFORE EACH USAGE. IF
IT SHOWS ANY SIGN OF DETERIORATION ( CUT
STRANDS, EXCESSIVE ABRASION ) , REPLACE IT.
IF YOUR ROPE IS DIRTY, WASH IT. DIRTY ROPES
DETERIORATE FASTER AND CAUSE PREMATURE WEAR
OF THE PARTS IN CONTACT WITH THE ROPE SUCH AS
THE CAPSTAN DRUM AND ROPE GUIDE.
Any rope that has been used for any period will show normal wear
and tear. Some characteristics of a used rope will not reduce
strength while others will. Below are the conditions that should be
inspected on a regular basis.
Double braid ropes consist of a cover or jacket braided
over a separately braided core. The strength of the double braid
rope is shared between the cover and the core. Damage to the
cover also usually affects the core and ultimately the strength of
the rope.
Rope inspection is done by running both hands over the entire
length of the rope while turning it in order to see all around. It is a
visual as well as a touch feeling process.
TWIST:
Every time you set the rope over the capstan drum you are twisting
the rope. Depending on the length of the rope, and what percentage
of the rope you use, you will sooner or later have a twisted rope with
reduced capacity because the strands are not loaded evenly. You
can un-twist the rope by spinning the rope to a free end. It is a good
practice to reverse the rope - use both ends. In addition to help with
the twist problem, the rope will also wear more evenly.
REDUCED VOLUME:
The rope can get smaller because of abrasion and cyclic tension
wear. If the rope volume is reduced by 50%, the rope shall be
retired. For a 12 mm diameter rope, that means that a rope with a
circumference of 19 mm (Ø6 mm). Shall be retired. Circumference
measurement is easier than trying to measure the diameter.
If the rope shows fused fibers, visibly charred and melted fibers,
yarns and/or strands, is extremely stiff and is unchanged by flexing,
it shall be retired.
GREY COLOR:
This comes from aluminium residues
from the friction on the capstan drum.
Your hands will get dirty but this does
not damage the rope.
CUT STRANDS:
A strand is made of one, two or more
groups of twisted yarn. Braided ropes
are typically 16-, 24- or 32-strand.
They can get cut by abrasion against
sharp edges or surfaces, or by cyclic
tension wear.
If three or more adjacent strands are
cut, the rope shall be retired.
MELTED OR GLAZED
FIBERS:
The friction of the rope on the
capstan drum generates heat. If the
rope is subject to high friction heat
for a long period - for example when
the load is greater than the winch
capacity - it can get damaged very
quickly.
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