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Hi dear PF'ers,

I have to develop a tank lifting system similar to the picture : http://www.astanks.com/Lifting%20method.JPG [Broken]. The lifting would be distributed evenly over a dozen of chain hoists pulled by motors.

Each chain hoist has a maximal load of 5 metric tons. Because the motors may not lift evenly, the tank might tilt a bit and the force distribution would not be equal.

The tanks that are to be lifted vary in diameter and height. The weight goes from 10 to 40 metric tons.

I would like to define maximal circular interval between each jack as well as the maximal tilt angle of the tank, as a function of tank dimension, so that each jack carries no more than 2.5t (a security factor of 2 seems appropriate). I do not know where to start... Should I use a simulation program ? Is wind negligible ? Any gut feeling on how the force distribution compares to the horizontal situation ?

Thank you for help !

Basile

I have to develop a tank lifting system similar to the picture : http://www.astanks.com/Lifting%20method.JPG [Broken]. The lifting would be distributed evenly over a dozen of chain hoists pulled by motors.

Each chain hoist has a maximal load of 5 metric tons. Because the motors may not lift evenly, the tank might tilt a bit and the force distribution would not be equal.

The tanks that are to be lifted vary in diameter and height. The weight goes from 10 to 40 metric tons.

I would like to define maximal circular interval between each jack as well as the maximal tilt angle of the tank, as a function of tank dimension, so that each jack carries no more than 2.5t (a security factor of 2 seems appropriate). I do not know where to start... Should I use a simulation program ? Is wind negligible ? Any gut feeling on how the force distribution compares to the horizontal situation ?

Thank you for help !

Basile

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