How should you run your agitator with respect to viscosity and boil-off?

“Boil-off” is the term that refers to the ambient heat input used to remove impurities from a process. During boil-off, the agitator should not operate at full speed, especially if the product increases in viscosity. If the agitator is to be run during boil-off due to process requirements and the product does experience an increase in viscosity, the agitator must be slowed down to at least half speed.