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Characteristics of Wire Rope
Kinks

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 13-7.-Correct and incorrect methods of measuring wire rope. at  least  5  feet  apart.  Use  the  average  of  the  three measurements as the diameter of the rope. NOTE:  A  crescent  wrench  can  be  used  as  an expedient  means  to  measure  wire  rope. WIRE ROPE SAFE WORKING LOAD The term safe working load  (SWL) of wire rope means the load that can be applied and still obtain the most efficient service and also prolong the life of the rope. The  formula  for  computing  the  SWL  of  a  wire rope is the diameter of the rope squared, multiplied by 8 (D x D x 8 = SWL in tons). Example: The wire rope is 1/2 inch in diameter. Compute the SWL for the rope. The first step is to convert the 1/2 into decimal number by dividing the bottom number of the fraction into the top number of the fraction: ( 1 divided by 2 = .5). Next, compute the SWL formula: (.5 x .5 x 8 = 2 tons). The SWL of the 1/2-inch wire rope is 2 tons. NOTE: Do NOT downgrade the SWL of wire rope due to being old, worn, or in poor condition. Wire rope in  these  conditions  should  be  cut  up  and  discarded. WIRE ROPE FAILURE Some of the common causes of wire rope failure are the following: l l l l size l Using incorrect size, construction, or grade Dragging  over  obstacles Lubricating  improperly Operating over sheaves and drums of inadequate Overriding or crosr winding on drums .   Operating   over   sheaves   and   drums   with improperly fitted grooves or broken flanges . Jumping off sheaves l  Exposing  to  acid  or  corrosive  liquids  or  gases . Using an improperly attached fitting .  Allowing  grit  to  penetrate  between  the  strands, promoting  internal  wear .  Subjecting  to  severe  or  continuing  overload l  Using  an  excessive  fleet  angle HANDLING  AND  CARE  OF  WIRE  ROPE To render safe, dependable service over a maximum period  of  time,  you  should  take  good  care  and  upkeep that is necessary to keep the wire rope in good condition. Various ways of caring for and handling wire rope are listed  below. Coiling and Uncoiling Once a new reel has been opened, it maybe coiled or faked down, like line, The proper direction of coiling is counterclockwise   for left  lay  wire  rope  and clockwise  for right lay  wire rope. Because of the general toughness and resilience of wire, it tends now and then to resist being coiled down. When this occurs, it is useless to fight the wire by forcing down the turn because it will only spring up again. But if it is thrown in a back turn, as shown in figure 13-8, it will lie down properly. A wire rope, when faked down, will run right Figure 13-8.—Throwing a back turn. 13-5







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