Started by Russell Lewis Jun 2, 2012.
Started by BRENT WEIR Sep 15, 2011.
Started by Tom Bradley. Last reply by Dave Van Holstyn Nov 29, 2010.
Comment
Hello:
I was wondering if anyone can help to shed some light on some questions I've been having regarding the safety factors on a rescue system. When we look at a typical high angle rescue system composed of:
- A main line made up of: a bombproof anchor, 40KN rated rope, steel biners, and a rescue rack or scarab
- A Belay line made up of: Bombproof Anchor, Load release hitch, steel carabiners, 40KN rope and triple-wrap, 8-mm tandem Prusiks on the rope.
- Litter & Attendant tie-ins to the rope with all equipment rated to the according safety factor (15:1).
If I take into consideration that a SF of 15:1 for a two person rescue load (600lb) is 9000Lbs or 40 KN when wouldn't a belay system like the one mentioned above fail to meet this safety factor? It is my understanding that tandem prusiks will slip somewhere around 20KN to 25KN on slow pull tests not dynamic events which I can only assume would be much lower than 20KN. So even if we considered that in a catastrophic loss of the mainline we only saw 20KN on the belay due to fall then we would only be a SF of less than 8:1. Am I missing something here? what other part of the system comes into effect at this point that pushes this to 15:1 or event 10:1?
My department is fortunate. Staffing, equipment and training is not an issue. As far as progression, we are really starting to get the newest and greatest stuff: MPD, OMNI pulleys, etc.
Does anybody have a annual Tech rescue training plan that their department uses and are willing to share.
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