Posted by T_Bone on October 24, 2007 at 11:02:36 from (4.240.42.150):
In Reply to: OT-- Crane Accidents posted by El Toro on October 24, 2007 at 09:20:44:
Hi Hal,
I too have seen this photo several years back and it just has to many things wrong in the photo.
I've rigged many cranes, both hydro and stick cranes, and I have yet seen where the operator would try and pick 1/10 the load rating from the side of the crane. It just isn't done as it can't be done.
Then there's the headache ball (the lack of) right up against the end of the boom as the load is clearing the water. From here the only thing the operator could do is boom up thus would have to lower the headache ball while booming up. As rigged this creates even a heavier bind on the sea wall.
The headache ball is missing. This is a counter weight for the lifting cable. Without the headache ball the cable will not feed out from the spool and the cable would then rat nest on the spool, just like line on a fishing reel does.
The load center of gravity is all wrong for where the rigging is attached. The load would be more vertical had it been picked this way.
The crane is too small for the water weight it has to pick and mush less not considering the weight of #1 crane.
I've was the master rigger on a 250ton stick crane where the jib boom broke. It was the crane owners fault for exceeding the load rating of the jib boom (a smaller lighter weight rated boom). That was a 11,000lb load on a 250ton rated crane. Were very lucky that no one got hurt.
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