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 TB 55-1900-232-10
B-8 INSPECTION
CAUTION
In general, one should wear gloves when handling wire rope except when it is moving
under load. The gloves, if snagged, can drag the hands into dangerous locations.
B-8 1
GENERAL. Inspect the rope thoroughly as it is being wound after each use The inspection criteria for general-
usage running rope are as follows:
a. Reduction of nominal rope diameter due to loss of core support, internal or external corrosion or wear of individual
outside wires
b.
Number of broken outside wires and degree of distribution or concentration of broken wires
c.
Corroded, pitted or broken wires at end connection
d.
Corroded, cracked, bent, worn or improperly- applied end connections
e.
Severe kinking, crushing or distortion of rope structure
f.
Evidence of heat.
B-8.2 SPECIFIC. Detailed steps for inspection and maintenance of wire rope are specified in NSTM 613
The principal steps in wire rope inspection are:
a.
Refer to Figure B-6 for nomenclature of wire rope and Figure B-7 for measuring wire rope.
b.
Clean wire rope by wire brushing and wiping with r gs.
a
c.
Inspect wire rope for rust, deterioration, corrosion, wear or flattening, broken strands and weakened splices.
d.
Count number of broken or protruding wires in each wire rope lay length.
e.
Measure wire rope diameter with vernier calipers.
f.
Replace wire rope when one or more of the follow- ing conditions exists.
(1) The nominal rope diameter is reduced by more than the amount shown in Figure B-7 for the applicable size
rope for measuring rope diameter
(2) Six broken wires in one rope lay length or three broken wires in one strand lay length
(3) One broken wire within one rope lay length of any end fitting
(4) Wear of one-third the original diameter of outside individual wires
(5) Evidence of pitting due to corrosion
(6) Evidence of heat damage
(7) Kinking, crushing or any other damage resulting in distortion of the rope structure.
B-9 SPECIFIC PRECAUTIONS
WARNING
It is extremely important that wire rope used in critical or potentially dangerous
applications such as towing be properly maintained.
Wire rope must be properly maintained when used in critical or potentially dangerous situations It should not be subjected
to any of the following common abuses:
a.
Chafing
b.
Impact loads or rapidly changing loads
c.
Incorrect size of groove on drum or sheave
B-7
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