(232f) Turbulent Power Draw During Abnormal Agitator Operation

On occasion, agitators are operated abnormally, either intentionally or by accident. For example, two of the more common modes of abnormal operation are running in reverse rotation and mounting the impeller upside-down. It is important for both equipment vendors and users to understand the effects of operating abnormally on agitator power draw. In the case of intentional abnormal operation, knowledge of the power draw effect can be used to ensure proper design for all modes of operation that will be encountered. For unintentional abnormal operation, knowledge of the power draw effect can be useful in diagnosing the cause of unexpected power draw. This presentation documents the effects of reverse rotation, upside-down impeller mounting, and other abnormal operating conditions on the turbulent power draw for a number of impellers, including both axial and radial-flow styles.