Which type of pump is typically used as the priming pump for a centrifugal pump?

A rotary pump is often used as the priming pump for a centrifugal pump due to its ability to effectively and quickly evacuate air from the suction line. This is essential for a centrifugal pump to function properly, as these pumps require a continuous column of liquid to create the necessary pressure to draw fluid.

Rotary pumps work by trapping fluid in pockets and pushing it through the system, making them suitable for overcoming the initial air in the system. They maintain a steady flow and can create a vacuum, which helps in enhancing the performance of the centrifugal pump once it is primed and ready to operate. This capability is crucial because if air remains in the suction line, the centrifugal pump will not be able to generate the required suction pressure.

Other types of pumps, while they have their own specific applications, may not be as effective for this priming purpose. For example, diaphragm pumps are generally used for applications requiring precise flow control, such as transferring delicate fluids, and may not effectively evacuate air in the same manner. Gear pumps are mainly used for high-viscosity fluids and wouldn’t provide the necessary suction for priming a centrifugal pump. Piston pumps are more suited for delivering high-pressure fluids and can also handle varying fluid viscosities, but