Progressive cavity pumps are widely used in wastewater treatment for conveying media such as wet sludge and flocculants. Selecting the appropriate pump and ensuring standardized operation are crucial for achieving economical, reasonable, safe, and reliable system performance.
In terms of pump selection, emphasis should be placed on equipment quality and cost-effectiveness. Priority should be given to products with low rotational speed, long pitch, superior material for key components, and a long rated service life. Rotational speed significantly impacts the operational efficiency and service life of the pump: although higher speeds can increase flow rate and head to some extent, they lead to a notable rise in power consumption and accelerate wear between the rotor and stator, thereby shortening the pump's lifespan. In contrast, a low-speed design can extend the equipment life multiple times. Therefore, in practical applications, a reduction gear is often employed to maintain the speed within a reasonable range.
During operation, it is essential to prevent debris from entering the pump chamber to avoid damaging the stator. Installing protective devices such as screens or filters at the inlet is recommended, and these should be cleaned regularly to prevent clogging.
Furthermore, the pump should be equipped with a run-dry protection device. In the event of feed loss, the pump must automatically shut down to prevent dry running, which causes severe wear, high temperatures, and potential burnout of the equipment. Maintaining a constant outlet pressure during operation and strictly avoiding overload use are also necessary to ensure long-term, safe, and stable pump operation.