ELECTROMAGNETIC
TESTING
OF
WIRE
ROPE
Electromagnetic non-destructive testing (NDT)
of
wire rope can be an extremely
valuable tool for the evaluation
of
the condition
of
a wire rope.
NDT
is frequently
used on wire ropes used in underground mines, material and passenger tramways,
and aerial lifts. The NDT devices in use today are capable
of
detecting localized
faults such as wire breaks and damage and loss
of
metallic area (LMA). A strip
chart can be produced by the device which provides a visual display and location
of
anomalies from a baseline reading. The rope can then be visually inspected for con-
firmation and assessment
of
the actual condition.
It is recommended that any new length
of
wire rope which will be assessed by
NDT equipment be inspected as soon as it is installed. This inspection will then be
the baseline for future
NDT
inspections from which LMA and other anomalies can
be assessed.
NDT inspection should not be, and is not intended to be, the only means
of
inspection.
NDT
inspections should always be considered an aid or supplement to a
careful and proper visual inspection. The output
of
an NDT will indicate areas
of
the rope that need closer inspection.
None
of
the NDT devices in use can measure loss
of
strength. Any attempt to
estimate the loss
of
strength should be based on the actual rope breaking strength
and not on the rope's minimum breaking force.
It
is very difficult and often mis-
leading to estimate loss
of
strength based solely on LMA.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth
Edition·
83
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