Hi All, I am designing a hollow rotating drum equipment which will be filled with specialized media for wastewater purification. I need help to design the shaft diameter for the entire assembly. The Drum will be hollow with a diameter of 1.77 meter and length of 2.5 filled with some kind of material in it. It will be submerged in the liquid at 50% level and will be rotating at 2.7 RPM with peripheral velocity of 15 m/min. The total weight of the drum would be round 1555 kgs. The length of shaft will be 5 meter and mounted with bearing on one end and drive unit on other end. Kindly let me know what can be the shaft diameter and how can We calculate it?