What wire rope can really do.

egilson1

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Technora will do that too; and yet, people wonder why riggers are so uptight on occasion. ;)
 
Had a theater that was open for 6 years that had a sprinkler pipe close to the head block for the main curtain. Six years of the wire rope sagging and rubbing up along the sprinkler pipe and they had cut themselves into the sprinkler pipe and had a leak open up all over a few stacks of their counterweights that rusted up in no time.
 
Seen these all the time doing inspections. Doesn't even always happen where the line has come off the pulley, the spacers between the cheeks can still end up in contact with the rope, depending on the angle the rope goes into/out of the pulley.

Sadly inexperienced people don't realise the importance of tightening slack lines. They get as far as wondering if a slack line means the ones in tension are overloaded, but seldom act on the fact that a slack line can hop off a pulley entirely and cut through the bolt that holds the pulley in place - which could of course cause the whole pulley to fail.
 
Theater I work at had a couple of linesets that were making a strange noise, upon inspection, several lift lines were in process of cutting sprinkler pipes in half, lucky for us, none of the pipes had to be replaced.... just moved the pipe hangers over and shifted the entire system over enough to clear all lift lines...
disaster averted....

Sean...
 

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