National Crane
PUBLISHED 04-26-2019 CONTROL # 113-09
2-27
600E2 OPERATOR MANUAL
SAFETY PRECAUTIONS
2
where it is no longer usable. Refuse to work with worn or
damaged hoist rope.
During regular inspections, operator shall ensure that
equipment surfaces such as wear pads, sheaves, etc have
not been damaged in a manner that can then damage the
synthetic hoist rope.
Example: if usage of a wire rope has cut grooves with sharp
edges in a wear pad, they need to be addressed before the
synthetic hoist rope is used in that same position.
Wire Rope
Use
only
the rope specified by National Crane as indicated
on the equipment’s
Load Chart
. Substitution of an alternate
rope may require the use of a different permissible line pull
and, therefore, require different reeving.
NOTE:
Rope may be purchased by contacting Manitowoc
Crane Care.
Always make daily inspections of the rope, keeping in mind
that all rope will eventually deteriorate to a point where it is
no longer usable. Refuse to work with worn or damaged
rope. Rope shall be taken out of service when any of the
following conditions exist:
•
For rotation-resistant running ropes: more than two (2)
broken wires in a length of rope equal to six (6) times the
rope diameter, or more than four (4) broken wires in a
length of rope equal to thirty (30) times the rope
diameter.
•
For running ropes other than rotation resistant: six (6)
broken wires in one rope lay or three (3) broken wires in
one strand.
•
One valley break where the wire fractures between
strands in a running rope is cause for removal.
•
Abrasion of the rope resulting in a 5% reduction in the
original wire diameter.
•
Any kinking, bird caging, crushing, corrosion, or other
damage resulting in distortion of the rope structure.
•
Rope that has been in contact with a live power line or
has been used as a ground in an electric circuit (eg.
welding) may have wires that are fused or annealed and
must be removed from service.
•
In standing ropes, more than three (3) breaks in one
rope lay in sections beyond the end connection or more
than two (2) broken wires at an end connection.
•
Core deterioration, usually observed as a rapid
reduction in rope diameter, is cause for immediate
removal of the rope.
The following is a brief outline of the basic information
required to safely use wire rope.
•
Wire ropes wear out. The strength of a rope begins to
decrease when the rope is put to use and continues to
decrease with each use. Rope will fail if worn-out,
o ve r lo a de d , m is u s ed , d a m a g ed or i m pr op e r l y
maintained.
•
The nominal strength, sometimes called catalog
strength, of a rope applies only to a new, unused rope.
•
The nominal strength of a rope should be considered the
straight line pull which will actually break a new unused
rope. The nominal strength of a rope should never be
used as its working load.
•
Each type of fitting attached to a rope has a specific
efficiency rating which can reduce the working load of
the rope assembly or rope system.
•
Never overload a rope. This means never use the rope
where the load applied to it is greater than the working
load determined by the rope manufacturer.
•
Never “shock load” a rope. A sudden application of force
or load can cause both visible external and internal
damage. There is no practical way to estimate the force
applied by shock loading a rope. The sudden release of
a load can also damage a rope.
•
Lubricant is applied to the wires and strands of a wire
rope when it is manufactured. The lubricant is depleted
when the rope is in service and should be replaced
periodically. Refer to the
Service Manual
for more
information.
•
In the U.S.A., regular inspections of the rope and
keeping of permanent records signed by a qualified
person are required by OSHA for almost every rope
application. The purpose of the inspection is to
determine whether or not a rope may continue to be
safely used on the application. Inspection criteria,
including number and location of broken wires, wear and
elongation, have been established by OSHA, ANSI,
ASME and similar organizations. See the
Service
Manual
for inspection procedures.
When inspecting ropes and attachments, keep all parts
of your body and clothing away from rotating hoist drums
and all rotating sheaves. Never handle the wire rope
with bare hands.
Some conditions that lead to problems in wire rope
systems include:
-
Sheaves that are too small, worn or corrugated
cause damage to a rope.
-
Broken wires mean a loss in strength.
-
Kinks permanently damage a rope and must be
avoided.
-
Ropes are damaged by knots. Rope with knots must
never be used.
Fo
r
Reference
Only
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