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www.onrope1.com/Myth9.htm
Not sure how scientific this was, but its on the Internet so it has to be true..... right?
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Which reads:
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Jim Kovach, in an exhaustive 8 month study in Ohio, and reported to/by ITRS (International Technical Rescue Symposium) including using rope as a doormat for months, and then driving over the same rope while it lay on beds of broken chards of bricks and a glazer’s pile of broken glass. Then the rope was pull tested! Although the kernmantle showed minor signs of wear, in testing no loss of strength was seen. There is no evidence that stepping on a rope will grind dirt past the kernmantle into the core.
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So, it's hardly very scientific. The argument against walking
on rope was that it got grit into it, and the grit would
weaken the rope in use. The test above goes to extremes
on the first part--the grinding in grit--, but omits the
"in use" part, where action on the rope, say, through a
rappel device or being bent over a 'biner on a fall or
lowering, might see the grit have effect. YMMV.
Ropes in many application areas see some abuse, and they
sometimes pay the price. As others have remarked, stepping
upon rope seems a reasonable thing to avoid, at least for
smaller ropes & climbing lines (which, as was remarked
above, don't have the tight mantle of most kernmantle
ropes for protection). If the rush of the job sees the
odd footprint on the rope, a shrug might be the right
response--no biggie--; but if needless, just careless,
"Why?" parades over the rope occur, maybe it's time to
see how well it works qua whip! --it's not like folks
are always checking to SEE what's on their soles, either.
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There are many "myths" that have grown up in the absence
of light from intelligent studies or better educated
speculation. There are SAR groups, allegedly, who can
require retirement of metal gear dropped even from short
heights (and the old microfractures myth from climbing)
--I recall getting into a heated debate on one of the
treeclimbing forums with SRT et al. who worried about
even the impact of a 'biner on the end of a line tossed
over a tree limb (!).
Will gasoline hurt the rope? Well, sadly, this myth
isn't so cleanly answered: no, for the petrol, pure;
but uncertain re whatever additives might be in it
(was a response from one ropemaker I got).
*kN*