Cable clamp inspection 1

[JAE]

I've got a structure that uses wire rope, or some sort of galvanized exterior strand, and is connected to other cables and plates with a thimble, looping back and lapping on itself and connected with multiple cable clamps - "U" shaped clamps that bolt the two laps together.

My question:

Over time, the cables and clamps have been exposed to weather. Other than visually examining the clamps for obvious deterioration, rusting, etc. are there other means of testing these clamps to verify their continued servicability and holding strength? After X years in service, do you simply go back and re-tighten the clamps?

Any experience or links would be helpful.

 

[SlideRuleEra]

If the clips were properly installed to begin with and have not corroded, I would leave them alone (only visual inspection, as you have noted). Over time, normally problems occur with the wire rope itself, not the clips.

"US Steel Wire Rope Engineering Hand Book", available on my website home page, covers proper use of the clips on page 76 (including tightening after initial loading). Care of wire rope and common causes of wire rope failure are covered beginning on page 113.

The 480 page Department of Energy "Hoist & Rigging Standard" (free .pdf download) may offer guidance, but I have not "dug" thru it. Here is the link

http://www.eh.doe.gov/techstds/Standard/std1090-04/toc.html

http://www.SlideRuleEra.net

 

[kslee2006]

1. Visual inspection can tell the tears & wears (section loss), and NDT can identify cracks. Any doubt in mind, replace the clamps and tighten to the specified level.

2. If clamps are in good shape, and no indication of cable slipage, I don't think there is a need for re-tightening.