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jeremy11
Oct 6, 2008, 5:27 PM
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I have seen steel biners break, but that was rigging a 1'000 foot zipline of 1/2" aircraft cable at a canopy tour. We were pulling it up with a tractor and one biner broke when the cable got stuck on a tree branch. Reset and tried again, then another carabiner broke. In one the notch on the gate broke, on the other the hinge pin broke. both were rated to about 30 kN and were quite old and beat up from ropes course building abuse. tri-loading was also a possibility with how it was rigged.
point being, steel biners are pretty bomber.
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NJSlacker
Oct 8, 2008, 12:33 AM
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jeremy11 wrote: both were rated to about 30 kN.
30kN steel? I have 25kN aluminum. My steel is 60kN. You need some real steel biners
jeremy11 wrote: point being, steel biners are pretty bomber.
that's not the point I got from your story...
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jeremy11
Oct 8, 2008, 12:45 AM
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NJSlacker wrote: jeremy11 wrote: both were rated to about 30 kN. 30kN steel? I have 25kN aluminum. My steel is 60kN. You need some real steel biners jeremy11 wrote: point being, steel biners are pretty bomber. that's not the point I got from your story...
they are bomber: here is what it took to break them
- old and abused by construction
- low rated for steel biners
(they exist and are on the market right now)
- possible tri-load (I didn't rig that part)
- 1000 feet of 1/2 inch aircraft cable
- pulled under tension by a tractor
- cable ran through a pulley at the top of the 60 foot tower, through a pulley at the bottom of the tower, then to the tractor
- this worked fine until the cable snagged on a tree limb
Point being THIS IS WHAT IT TOOK to break an old, beat up, low rated steel biner!
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shaun_the_conqueror
Oct 8, 2008, 12:55 AM
Post #79 of 83
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Note to self:
Check rigging before ever going on a canopy tour...
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jeremy11
Oct 8, 2008, 1:09 AM
Post #80 of 83
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shaun_the_conqueror wrote: Note to self: Check rigging before ever going on a canopy tour...
this was the tensioning.
the finished product is a pole wrap with three fist grips, multiple guylines, as bomber as it gets and full in accordance with Association for Challenge Course Technology standards.
Its not like the canopy tour is in Costa Rica or anything
Feel free to inspect all you want though.
(This post was edited by jeremy11 on Oct 8, 2008, 1:14 AM)
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shaun_the_conqueror
Oct 9, 2008, 4:38 PM
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Well apparently they need to learn a thing or two about inspecting and retiring gear.
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dynosore
Oct 9, 2008, 5:01 PM
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Do you drive your car with the motor screaming at 6500 rpm redline constantly? Just because a mechanical component is rated for a certain strength doesn't mean you should constantly load it to the brink! Ever hear of a safety margin? Steel biners are a lot cheaper than broken ankles!
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USnavy
Oct 27, 2008, 9:46 AM
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majid_sabet wrote: I wonder how they guys really stay alive doing what they do. I took this photo in my gym for reference to point out biner cross loading. [IMG]http://b.imagehost.org/0621/04-06-07_2000.jpg[/IMG] [IMG]http://b.imagehost.org/0621/04-06-07_1957.jpg[/IMG] [IMG]http://b.imagehost.org/0621/04-06-07_1959.jpg[/IMG]
Triaxial loading, not crossloading. That’s not an example of crossloading.
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