caribeana fail !!

[baileyben]

we are back on the job tomororow if i find it i will post pictures. .

[defenderjack]

was a steel karibeaner and was rated at 30kn and it wasnt a huge piece of tree really. . we had lowered the same size/weight section out of an other ash tree on the same job yeasterday. . . . . it could have just been the shock of the tree was too much for it. . . or we were abusing it? . .just seemed a bit extreme to me. . . btw we still havnt found the karibener to see how it broke. . .

 

do you mean it was on the end of the lowering line that went round the limb and clipped back on to itself ?? and when you say shock of the tree do mean it was snatching on it ?

[Tony Croft aka hamadryad]

overloading, get your eyes on the rr668 doc and do some homework!

[Tony Croft aka hamadryad]

RR668: Evaluation of current rigging and dismantling practices used in arboriculture

[Sully]

i do a half hitch before the krab on the piece im lowering, rope takes the shock not the knot or krab.. did you do this?

[Mark Bolam]

Sounds like operator error rather than carabiner failure to me.

 

Prove me wrong by explaining what happened properly and providing pics.

[Dowden]

At what point in the procedure did it fail?

 

If you were shock loading or snatching? If so, thats probably caused the failure.

[Rupe]

I still dont get it!! Was the lowerign line going through the karabiner or was the biner attached to the end of the lowering line and clipped to the lowered section?

 

Basially it sounds like you dont know what you were doing. No karabiners, even steels, should be used in shock loading situations unless the loads a very small. If you were using blocks attached without karabiners and a lowerign line tied to your lowered piece you would have been fine.

 

If you were natural crotching then that makes everything worse, too much friction at the crotch places more load on the line between it and the lowered section rather than disipating the load through the entire length of the line.

 

Back to school for you me thinks!

[3dogs]

Was it dirty? probably just needed a good wash and it would have been fine:sneaky2:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Just couldn't resist. sorry:laugh1:

[skyhuck]

Was it dirty? probably just needed a good wash and it would have been fine:sneaky2:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Just couldn't resist. sorry:laugh1:

 

:lol: