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Furthermore, you have a limited number of fairly standard length slings, not an infinite number of lengths and diameters. Ask them what this limit is, and if they expect it to be zero, they should furnish the spreaders and slings tuned to their exact CG's and out of level lifting criteria. The vendor gives you a weight and CG, within what error limits or tolerances? They should expect some lateral load input into their lifting lugs and skid structure due to field lifting (your 5° or less from vertical, maybe should or could be 10°), unless they furnish the rigging equipment to prevent this. can be calculated, but the real world keeps getting in the way.
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I'm sure an exact sling force, length, elongation, (the latter two are desertfox's compatibility items) etc. You may be kinda beating a dead horse here. RE: Rigging CG calculations in Excel desertfox (Mechanical) 26 Apr 10 00:40 I am trying to figure out a way to calcualte the length of the longer slings to hoist the load level. More often there are shackles added to the lighter sides of the slings that attach to the lifting eyes causing them to be longer.
Crane lift calculator xls how to#
I know how to figure the upper sling adjustments but this is rarely done since if it was not correct then the whole assembly of lifting equipment would be lowered to the ground. This can be done to the upper slings off of the spreader bars to move the hoisting hook over the center of gravity so the load is picked level or it can be done with the 4 vertical slings that attach to the picking eyes from the bottom of the lower 2 spreader bars. So if the center of gravity is not perfectly centerd between all of these 4 pick points then there has to be adjustment made. Off of the bottom of these 15 foot bars will be vertical slings that will attach to your trunions or lifting eyes located typically at the bottom of the skid or module. These will attach with 2 slings off the top to the bottom of each end of the 40 feet bar. Off the bottom of that upper bar will be 2 15 foot bars, one on each end. The upper bar will have 2 slings on it and be 40 feet long to give the long spread. You will have a 3 spreader bar configuration to pick it. So imagine a box that is 40 feet long 15 feet wide and 15 feet tall. What I am tlalking about is picking up a skid or module based structure. As far as calculating the sling length or tension with the use of a 4 way that is a differnet situation. If you have a solution please advise and I will try to implement and share the file as I generate it. This can be compounded if the CG moves in both horizontal directions. The idea is to lengthen the slings with the use of a shackle or 2 on one or 2 slings while the other ones stay the original length. If it moved to one side horizontally then the 2 slings on the heavy side would have to stay the nominal length while the 2 on the light side would have to get longer (20' + 1ea 25ton shackle). If the CG was perfect between 4 pick points then all slings would be the same length (lets say 20'). The idea is so people actually doing the work can understand how to figure the new sling length. If possible can we leave out the beta's and alpha lingo since all it requires is simple math equations. I have been using excel to generate lift plans for 6 years and I would like help for this equation. This is for hoisting equipment where the load on each sling is calculated from the vendor which in turn gives an accurate center of Gravity. What I am trying to figure out is how to make it so I adjust the 4 lower vertical sligs by adding shackles to come up with the CG adjustment. I have been using a CG calculation that adjusts the Y part of the upper spreader bars to move the crane hook over the center of gravity. On another note I am trying to figure out the equation to adjust the vertical slings on a 4 point pick with 3 spreader bars. You can input the Weight and angles and it will calculate the tensions. I have made this simple spread sheet to calc it. Itwas what is the tension on a sling with the load and angle known. There was a question in a thread that is now closed but there was no solution to the Rigging question that was asked.