I am looking for a motor that meets the following requirements:
Spin about a 50 gallon tank filled with liquid
Tank of about Diameter 12 in, height 16 in
The motor needs to start the tank from sitting still
and spin it for about 20 minutes at a decent speed

I have been looking at gear motors, torque motors ect...but I am unsure how to determine what motor to use. When looking at gear motors - How should I calculate the startup torque? (been using I*Alpha is this correct? I got about 25 in-lbs) and the constant torque required once it it spinning? ??

******the process is being used to separate one mixture into 2 liquidsI have been looking at gear motors, torque motors ect...but I am unsure how to determine what motor to use. When looking at gear motors - How should I calculate the startup torque? (been using I*Alpha is this correct? I got about 25 in-lbs) and the constant torque required once it it spinning? ??