How is critical speed determined during pump design?

During pump design, critical speed is determined by maintaining speeds within a certain range of the rated speed, which is typically set at 20%. This is essential because operating a pump too far from its rated speed can lead to various operational issues, including increased vibration and potential cavitation. The concept of critical speed relates to the rotational speed at which the forces on the pump become unbalanced, potentially leading to excessive wear or failure.

Staying within 20% of the rated speed ensures that the pump operates efficiently and safely, minimizing risks of mechanical failure and maintaining optimal performance. This careful speed consideration is a core aspect of pump design, ensuring that the necessary hydraulic performance is achieved while adhering to safety margins.

Rather than focusing solely on temperature limits, flow rates, or power consumption, maintaining a speed range that adheres to the rated specifications provides a more comprehensive approach to avoiding problems associated with resonance and imbalance within the pump system.