How to calculate torque and power for diabolo rollers

[zarghami]

Hi everybody
I'm designing a diabolo roller station for centeralizing of pipe consist of 2 rubber coated diabolo.the max weight of pipe is 22 tons and rpm is 30.
i need to calculate torque for selecting of hydromotor.
i appreciate if help me.

 

[billy_joule]

You will need to provide a lot more information.

This thread was about a very similar calculation:
https://www.physicsforums.com/threads/torque-and-power-requirement-for-roller.767049/