I have been trying to figure out the starting torque needed to start rotating a pipe and valve in a weld fixture. The pipe is 304 stainless 24 inches outside diameter and has an inside diameter of 23.625 inches. The length of pipe varies but so far all of the lengths of pipe get a valve welded on, the valve itself weighs 12000lbs. From the center of the pipe diameter to top of the valve is 78 inches. The total weight of the weldment is 22000lbs but they want to be able to weld weldments that weigh 44000lbs.(adsbygoogle = window.adsbygoogle || []).push({});

The weldment is attached to the gearbox that has a 50:1 ratio and 7HP motor with a VFD, and is supported by pipe roller stands. I am just wondering how do I calculate the torque needed to start rotating a 22000lb object disregarding any losses due to the roller stands.

Any help is greatly appreciated.

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# Calculating Starting Torque

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