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Table of classification methods, types, and characteristics of centrifugal pumps. There are many ways to classify centrifugal pumps, which are categorized based on their different structural features. I. Classification by the number of working impellers 1. Single-stage pump: That is, there is only one impeller on the pump shaft. 2. Multi-stage pump: This type of pump has two or more impellers on its shaft; the total head produced by the pump is the sum of the heads generated by each of these impellers. II. Classification by working pressure 1. Low-pressure pumps: Pressure below 100 meters of water column ； 2. Medium-pressure pump: Pressure ranging from 100 to 650 meters of water column ； 3. High-pressure pump: Pressure higher than 650 meters of water column. III. Classification by the water inlet method of the impeller 1. Single-sided water inlet pump: Also known as a single-suction pump, it has only one water inlet on the impeller ； 2. Double-sided inlet pump: Also known as a double-suction pump, it features an inlet on each side of the impeller. Its flow rate is twice that of a single-suction pump; it can be considered as two single-suction pump impellers placed back to back. IV. Classification by the type of joint in the pump casing: 1. Horizontal split-case pumps: Those with a joint located in the horizontal plane that passes through the axis of the pump. 2. Vertical joint surface pump: that is, the joint surface is perpendicular to the axis line. V. Classification by pump shaft position 1. Horizontal pumps: The pump shaft is in a horizontal position. 2. Vertical pump: The pump shaft is in a vertical position. VI. Classification by the way in which the water exiting the impeller is directed to the discharge chamber: 1. Volute pump: After exiting the impeller, the water enters the pump casing, which has a spiral shape. 2. Vane pump: After exiting the impeller, the water enters the vanes located outside it, and then proceeds to the next stage or flows into the inlet and outlet pipes. When we say that a certain water pump is a multi-stage pump, it refers to the number of impellers it has. Based on other structural characteristics, it could also be a horizontal pump, a pump with vertical joint surfaces, an impeller-type pump, a high-pressure pump, or a pump with water intake on one side, among others. So, depending on the criteria, it has different names. Additionally, they can also be classified by their purpose, such as oil pumps, water pumps, condensate pumps, ash discharge pumps, circulation water pumps, etc.