Classification of Centrifugal Pumps

It's interesting when we talk about centrifugal pumps, this is a centrifugal pump, this is a centrifugal pump, this turns out to be a centrifugal pump. They are very different in shape and size, but they would still be collectively referred to as centrifugal pumps. Centrifugal pumps are a big category, and we classify centrifugal pumps according to their internal structure or other characteristics.

Centrifugal pumps are widely used in modern industry and daily life. Centrifugal pumps are found in all areas of fluid transport.

Centrifugal pumps are divided into many types according to different structural characteristics.

■  According to the number of working impeller: there are single stage pumps and multistage pumps;

■  According to the working pressure: there are low pressure pumps, medium pressure pumps, high pressure pumps;

■   According to the suction type: there are single suction pumps and double suction pump;

■  According to the pump casing joint form: there are horizontal split casing pumps and vertical joint pumps;

■    According to the discharge type: there are volute pumps and guide vane pumps.

For example, we sometimes say one pump belongs to a multistage pump according to the impeller stage number, then observe its structural characteristics, and it may be horizontal pump, or vertical combined surface pump, or guide vane pump, or high pressure pump, or single-side water pump, etc.

■  According to the different position of the pump shaft: there are horizontal pumps and vertical pumps. Horizontal centrifugal pump are the most widely used in petrochemical industry.

■    Horizontal centrifugal pumps according to the pump casing split form: there are radial split horizontal centrifugal pumps and axial split horizontal centrifugal pumps

■   According to the number of pump casing: there are single casing pumps and double casing pumps  (cylinder type);

■   According to the bearing support type: there are cantilever centrifugal pumps and between-bearings centrifugal pumps.

The chart below is simple and clear and very easy to understand the classification of centrifugal pumps.

Pump type			Orientation		Type code
Centrifugal pumps	Cantilever	Flexibly coupled	Horizontal	Foot-mounted	OH1
				Centerline-supported	OH2
			Vertical in-line with bearing bracket		OH3
		Rigidly coupled	Vertical in-line		OH4
		Closed-coupled	Vertical in-line		OH5
			High-speed integrally geared		OH6
	Between-bearings	Single-stage and two-stage	Axially split		BB1
			Radially split		BB2
		Multistage	Axially split		BB3
			Radially split	Single casing	BB4
				Double casing	BB5
	Vertically suspended	Single casing	Discharge through column	Diffuser	VS1
				Volute	VS2
				Axial flow	VS3
			Separate discharge	Line shaft	VS4
				Cantilever	VS5
		Double casing	Diffuser		VS6
			Volute		VS7