What should be ensured before commencing pump operation?

Before commencing pump operation, it is crucial to ensure that the impeller is immersed in fluid. This is essential because if the impeller is not submerged, the pump will attempt to draw air instead of liquid. This can lead to cavitation, which can damage the impeller and decrease the efficiency of the pump. Furthermore, running a pump dry can lead to severe overheating and mechanical failure.

While ensuring that the motor is at full speed, the oil reservoir is drained, or the discharge valve is fully open may be important for other aspects of pump operation, they do not directly address the fundamental requirement of achieving flow. Ensuring the impeller is submerged guarantees that the pump will operate correctly and effectively, thus protecting both the pump and the system it serves.