Wiring rope retirement criteria
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The standards for discarding steel wire ropes mentioned there are too literal and somewhat difficult to understand. Could someone explain them in simpler terms? This post was last edited by limingshuguang on 2008-1-5 at 10:36
Thank you, I’ve learned it. You’ve worked hard
The standard specifies 12 scenarios for scrapping, detailing the criteria for scrapping such as broken wires, wear, corrosion, and deformation.
The replacement standard for a steel wire rope is when the number of broken wires within one lay length reaches 10% of the total number of wires in the rope； When the wear or corrosion of the steel wire rope exceeds 10% of its original diameter, it should be replaced with a new rope. For details, please refer to Tables 1-9 and 1-10 on page 45 of \"Safety Production Technology\" (the 2005 edition of the safety examination textbook)
I also have the book, but I’m not quite clear on what the concept of \"1 twist pitch\" means. Could you explain it in more detail?
http://hiphotos.baidu.com/steelwirerope/pic/item/4ae6cc0748719cc87a89473a.jpg
The \"one lay pitch\" of a steel wire rope refers to the distance between two corresponding points on each strand of the rope as it rotates one full circle (360 degrees) around the core. During measurement, select any strand on the surface of the steel wire rope that is parallel to the diameter passing through the center line of the rope and mark it as 1; then mark the subsequent strands as 2, 3, 4, 5, …, and for a rope with six strands, mark them up to 7. The distance between measurement marks 1 to 7 is the lay length of the steel wire rope. This post was last edited by Li Xuegang on 2008-1-13 at 14:51.]