OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

• The ends of a wire should be periodically reversed in order to evenly distribute the wear.


• When points of wear develop on wire lines, the wire up to and including the worn sections
  should be cut off and removed.

B.2 INSPECTION OF WIRE LINES AND

GUIDELINES FOR REMOVAL FROM SERVICE

Since wire lines deteriorate in service, regular inspec.tion is necessary to as sess damage to the wire
and to perform remedial action. FoUowing are some guidelines for inspection:

• The wire diameter should be checked. A marked decrease in wire diameter is a sign tbat the
  line should be removed from service. Reasons for the decrease could be core deterioration,
  internal wear and wire failure, or internal corrosion.

• The wires of the outer layer should be inspected for wear and breaks. If lubrication has been

good and operating conditions such that the inside wirC'> are inLact, the reserve strength of tbe

inside wires will be maintained. In Ihie case, only a strength reduction corresponding to the

broken outer layer wires need be deducted from the rope stTength.

• Wires should be cbecked for abrasion. If the outside wires show a considerable loss of metallic

area, the line should be removed from service.

• Individual wires on the strand crowns should be inspected for fatigue brcaks. These are char-
  acterized by squared-off ends perpendjcular to t he broken wire. I f I hese wire breaks occur at
  the st-rand crowns, ~he residual wire line strength may be estimated by counting the number
  of breaks in the Length of ODe lay and subtracting these from Ihe numbe.r of wire stra.nds in
  the line in order to delermjne the number of remaining unbroken strands. A wire lay is the
  diSLance parallel 10 Ihe longitudinal axis of t he rope in which a strand makes a complete rurn
  about the axis of the line. One wire lay has bcen selected as the lengtb for which to note Ihe
  breaks because the loss due 10 a broken wire is effective for approximalely this distance.

• Look for fatigue breaks at or near the valley positions of the strands. If onc fatigue break of

this cype is nOled. the Line should be removed from service, since further deterioration of this

type will doubtlessly have taken place where. it cannot be easilY dctccted.

• Remove the wire up to and including the kinked or cut sections.


• An inspection should be nlade for corrosion and lbe line sbould be retired from service if
  corrosion bas penetrated below the surface of the wires.