Rank: Forum user 
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We operate in the field of geological surveying and place probes (~2m long) into pre-drilled holes (diameter <5cm). These probes weight less than 5kg. The cables used to lower the probe can be between 750 to 1500m in length and are wound, under tension onto a wooden reel (pretty much standard stuff). Do the cables need to be examined on a regular basis? If so, how frequent? What type of examination is required? Visual only? or some type of testing? Since the probes are lowered underground there are no safety risks if the cables fail - just loss of expensive equipment. The operator is in close proximity to the winch and witnesses all actions.
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Rank: Super forum user 
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You say there are no safety risks if the cables fail, but couldn't a cable snap and then whip around?
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Rank: Super forum user
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Another question - you don't really mean 750 to 1500m do you?
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Rank: Super forum user
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Hi Evans Have you asked around members of the Association of Geotechnical and Geoenvironmental Specialists and/or British Drilling Association?
Might possibly depend on whether the winching is done by hand or using power + how much of the cable is above ground. Greatest risk is perhaps if the hole hasn't been drilled as well as it should have been or the ground fractures, releasing a bit of blockage into the hole, such that when you try to retrieve the probe, you are lifting probe, cable and some of the ground around. BUT as you say in the event of failure you lose the probe, but probably without risk to human health UNLESS there is enough cable above ground to whiplash.
Edited by user 15 October 2024 10:06:58(UTC)
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