Under what circumstances are high-speed centrifugal pumps generally used?

Basic knowledge about high-speed centrifugal pumps (partial-flow pumps): A high-speed centrifugal pump consists of three components: a drive motor, a speed increaser, and the pump itself. Its vertical structure is widely used, with a power range of 7.5~132kW ； When the drive power exceeds 160 kW, a horizontal structure is used. Both the pump and the gearbox are of enclosed design, allowing them to be used outdoors. The impeller of high-speed centrifugal pumps is of the fully open type, without front or rear cover plates; its blades are radial and straight. There are two structural types: ordinary impellers and impellers equipped with an inducer ； The impeller is mounted cantileveredly on the pump shaft, which is directly connected to the high-speed shaft of the gearbox. High-speed pumps are generally suitable for applications involving high head and low flow rates, as well as media containing solid particles and high viscosity.

From low pressure to high pressure, it can generally be achieved using positive displacement pumps, multi-stage centrifugal pumps, and high-speed centrifugal pumps. In the petrochemical industry, high-speed centrifugal pumps or multi-stage pumps are generally used as feed pumps and injection pumps in hydrogenation units.

Centrifugal pumps are generally used in applications with relatively clean media, low viscosity, and moderate flow rates and head pressures. If the medium to be transported contains no fibers or large solid particles, has a viscosity of 0–200 cp, a flow rate ranging from 5–1000 m3/h, and a head of 10–80 m, a single-stage centrifugal pump can be used. When the head exceeds 80 m, a multi-stage centrifugal pump is appropriate.

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High-speed centrifugal pumps are generally used to transport clean materials, and they are applied in situations where there is a low flow rate, high pressure, and a requirement for stable flow. Higher pressure or lower flow rate requirements can be met using reciprocating pumps. For materials with low pressure requirements but high flow rates, a single-stage centrifugal pump can be used. For high pressure and large flow rates, multi-stage centrifugal pumps can be considered. Of course, the specific situation needs to be calculated in order to determine which pump to use.

I’ve only seen them in person; I don’t know when one should choose them in such situations..

Domestic equipment offers good value for money, provided it is obtained through legitimate supply and procurement channels. Otherwise, the so-called domestic equipment purchased by some of our organizations has a short lifespan and poor corrosion resistance; such products are a detriment to the reputation of domestic goods – it’s better to avoid them