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  1. Burnham

    Breaking strength ratings, misc. life support hardware

    Quick phone call might be a cheaper way...:|: :D
  2. Burnham

    Breaking strength ratings, misc. life support hardware

    That's a new one to me, Stephen...never heard of the company either. Doesn't say what diameter rope it's designed for... Wonder if the quick release pin can be replaced with a bolt? Pretty inexpensive compared to most of the competition.
  3. Burnham

    Breaking strength ratings, misc. life support hardware

    What you just described works just as well, so long as you have enough lanyard, Gary.
  4. Burnham

    Breaking strength ratings, misc. life support hardware

    Agreed, Justin. Again, I'm really not concerned about these devices, or D rings either, being safe. I am looking for a way to address their lower than OSHA requirement breaking strengths in language I can defend.
  5. Burnham

    Breaking strength ratings, misc. life support hardware

    Gary, I might use this when I want to counter the pull of the lifeline...say my tie in is above and off to the left and I want to cut on my left. If I can cinch the lanyard to a limb off to the right, exerting pull on my right D ring, I keep from having to fight the lifeline's pull on me...
  6. Burnham

    Breaking strength ratings, misc. life support hardware

    Some meet 5,000 lbs. and some don't, Justin. The Petzl Macrograb is 6,000, but the Micro is 3,500. There are 3 different versions of the Gibbs, only one exceeds 5,000. The Positioner, Trango Cinch, and the Ushba don't meet 5,000...best as I can ascertain. CMI Ropewalker does exceed...7,500...
  7. Burnham

    Breaking strength ratings, misc. life support hardware

    Now we're getting somewhere. Thanks very much, Justin. Any bright ideas about the lanyard adjusters?
  8. Burnham

    Breaking strength ratings, misc. life support hardware

    I don't have any rub with the dicotomy of 5,000 lb. vs. 22kN specs...we have written that exception to the Z into the FS climbing regs. Those two numbers are so close as to be materially identical. Where I'm in real conflict is how to manage language in the FS Treeclimbing Guide to allow use...
  9. Burnham

    Breaking strength ratings, misc. life support hardware

    Also, my main question doesn't revolve around whether these items work, or are safe...it's a question of is my interpretation of the Z correct, and are they therefore non-compliant. Look in any arbo catalog...there are quite a few products sold in applications that seem to me to not meet the BS...
  10. Burnham

    Breaking strength ratings, misc. life support hardware

    I'll cede your point in that application and situation, Brian. But there are several other failure scenarios for ascenders that have nothing to do with dynamic loads. How about the lanyard adjusters?
  11. Burnham

    Breaking strength ratings, misc. life support hardware

    How about useing the Micrograb as a lanyard adjuster, and the Positioner...neither meets the 5,000 lb. standard. I'll bet the Trango Cinch doesn't either, though I don't know.
  12. Burnham

    Breaking strength ratings, misc. life support hardware

    Good point, Brian...and here's a rub. I am liking the heck out of backing up my double handle, two rope Kong ascender with the Micrograb. Doesn't appear to be a compliant arrangement, even though I KNOW it's safe.
  13. Burnham

    Breaking strength ratings, misc. life support hardware

    Ok, I have some questions that keep bugging me. And some of these subjects keep rearing their ugly heads during my discussions with my peers on the USFS tech. advisory group. Not interested in safety police action here. Just want to hear opinions of where we stand meeting recommended...
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