Manitowoc UTC 1700 JBT Crane

ROYCE said:
I agree a load chart should be present on the crane. It is actually a law. The other concern is that even though a crane can take that big piece and not tip over, or bend your boom you could be working way over the structural stability of the crane. Think of it as a rigging line that is rated for a MBS of 20K pounds. You don't go out and take a 20K pound piece, it will break. You take lots of smaller pieces over a longer period of time to keep the cycles to failure low.
A load chart or an LMI keeps you safely in these boundaries. But honestly a load chart is useless in tree care because you have to have something to tell you what the piece you just cut weighed.
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Is it practical to place those rock exotica enforcers in your rigging systems? It looks like they can even run in parallel on a single sling with the creative use of rigging plates. I don't do crane work, so I could be way off with this. Each one records up to 20kN. How many kN do your crane picks generate?
 
Steve, like Deevo said, your no where near green horn status. One thing to remember with crane picks, or even rope work, trees weigh differently throughout the seasons. In other words, trees that retain mucho water will be heavier after long periods of rain compared to a dry spell. Also, in the pine family, sap is abundant in the July & August months. After a couple of jobs with the guy you will be a well oiled machine with him.
 
96coal449 said:
Steve, like Deevo said, your no where near green horn status. One thing to remember with crane picks, or even rope work, trees weigh differently throughout the seasons. In other words, trees that retain mucho water will be heavier after long periods of rain compared to a dry spell. Also, in the pine family, sap is abundant in the July & August months. After a couple of jobs with the guy you will be a well oiled machine with him.
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Do you have any reference to support that statement? I remember reading that they weigh more or less the same throughout the year.
 
Levi.CO said:
Do you have any reference to support that statement? I remember reading that they weigh more or less the same throughout the year.
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No, just a common sense approach. I've watched Chinese Elm piss water from the larger diameter cuts and wet down the landing zone. Water weighs almost 7 lbs per gal, so it's just my assumption. You could very well be correct Levi. Guess this opens another discussion. Anyone else's knowledge on this is greatly appreciated.
 
96coal449 said:
I'm wrong again. Time to get out of this conversation. :aburrido:
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Hold on, stay in this conversation because you bring up some really good points.

I do not have any research data to back this up either but can say from experience that certain species do weigh more when there is more water present in their cells. This certainly true in the spring just as the leaves have emerged and the tree starts to transpire and pull up water from the roots.
I have done a bit of crane work and we always have the scale to check the weights. This spring we took out a beech tree top that we estimated to be approx. 3500 pounds. Upon cutting it the weight was closed to 5K. If you looked at the size of this piece you would of been amazed. There was water dripping odd the butt end of the log. water weight!!
Another point I will make is a large mature crown right after a rain storm will have added weight from the water in the leaves. You wouldn't think this would matter but in my experience it adds a bit more weight.
 
Levi.CO said:
I'm not convinced, let me see what I can dig up...
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Why are you not convinced? Your feeling like the water that a tree takes in would not amount to that much weight? Or, that a tree is constantly taking in the same amount of water so their fore it would always weight the same?

Do you happen to burn cordwood in a wood stove? I only ask because when I stack green wood it is much heavier then when I go back to the wood shed and grab the dried wood.
 
Steve Connally said:
Hey the only reason I know that is because of the fire department and calculating foreground hydraulics and building loads during firefighting.
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Ahhh Steve, glad your on top of that. Another pound/ gal adds up quick. My dyslexic brain crosses info from time to time. Fuel oil weighs in around 6.5 lbs/gal. Somewhere around there anyway.
 
A little bit of both Royce. I think Bartlett has done a study on this. From what I remember it was determined that the weight was virtually the same, year round. I do smoke a lot of grass though.... so, you know...
 
Levi.CO said:
A little bit of both Royce. I think Bartlett has done a study on this. From what I remember it was determined that the weight was virtually the same, year round. I do smoke a lot of grass though.... so, you know...
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Ha, well you got me thinking so!! I would like to see some research on it though. Are you smoking right now:)
 
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