Part N
umber
6410T0006
Version 4/23/2010
24
INSPECTIONS
WIRE ROPE INSPECTION
All wire ropes will wear out eventually and gradually lose work capability throughout their service life.
That’s why periodic inspections are critical. Applicable industry standards such as ASME B30.2 for
overhead and gantry cranes or federal regulations such as OSHA refer to specific inspection criteria for
varied applications.
Three purposes for inspection
Regular inspection of wire rope and equipment should be performed for three good reasons:
It reveals the rope’s condition and indicates the need for replacement.
It can indicate if you’re using the most suitable type of rope.
It makes possible the discovery and correction of faults in equipment or operation that can cause
costly accelerated rope wear.
How often
All wire ropes should be thoroughly inspected at regular intervals. The longer it has been in service or the
more severe the service, the more thoroughly and frequently it should be inspected. Be sure to maintain
records of each inspection.
Appoint a qualified person to inspect
Inspections should be carried out by a person who has learned through special training or practical
experience what to look for and who knows how to judge the importance of any abnormal conditions the
may discover. It is the inspector’s responsibility to obtain and follow the proper inspection criteria for
each application inspected.
What to look for
Here’s what happens when a wire breaks under tensile load exceeding its strength. It’s typically
recognized by the “
cup and cone
” appearance at the point of
failure. The necking down of the wire at the point of failure to
form the cup and cone indicates failure has occurred while the
wire retained its ductility.
This is a wire with a distinct
fatigue break
, It’s recognized by
the
square end
perpendicular to the wire. This break was
produced by a torsion machine that’s used to measure the
ductility. This break is similar to wire failures in the field
caused by fatigue.
Summary of Contents for RAPID-ROLL 570
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