The specifications of the pump chosen are determined by the nature and flow rate, as well as the pressure of the fluid being conveyed. The pump's speed is selected based on the viscosity and corrosivity of the fluid, with these being key parameters, to ensure the reliable operation of the pump. For reference, see Figure 2.

Pump designs permit higher speeds when handling clean water or non-corrosive liquids similar to clean water. In actual use, due to variations in medium properties and lifespan requirements, the speed is typically lower than the designed speed. For high-viscosity and particulate mediums, the speed is usually set at 1/2 to 1/3 of the design speed or less. Lower speeds are beneficial for reducing pump wear, but as the stator wears down, flow decreases, necessitating a slight increase in speed to compensate for the reduced flow, which is a common practice. The temperature of the medium being transported should be between -10℃ and 80℃, with special cases reaching up to 120℃.

Each stage of the pump (a winding of the stator) operates at a normal pressure of 0.6 Mpa, allowing up to 0.8 Mpa for short durations (not exceeding 30 minutes). As wear occurs, the volumetric efficiency must gradually decrease at the same output pressure.

During water pumping, the recommended maximum suction lift is 6.5 meters, as the maximum achievable is 8 meters. When pumping high-viscosity media, positive pressure suction should be employed.