What Are The Three Types Of Centrifugal Pumps?

Centrifugal pumps can be divided into three kinds according to its structure, application and working principle. Each type varies in application scenarios and performance characteristics:
I. Classification by structural form
1.Single-Stage Centrifugal Pump
Structural Characteristics: contains only one impeller, through the impeller liquid only works once.
Performance Characteristics: Low head of water (typically ≤150 meters) but high flow (up to several thousand m3/h).
Simple structure, convenient maintenance and low cost.
High efficiency, suitable for low pressure and high flow rate.
Typical application:
Clearwater transportation (e.g., urban water supply, farmland irrigation).
Industrial water recycling systems (such as cooling tower toner).
Air conditioning, cooling, water circulation.
2. Multistage Centrifugal Pump
Structural Characteristics: Contains multiple impellers; liquid works its way through each impeller in turn, with the head increasing with each stage.
Performance Characteristics: Water head height (up to kilometre grade, such as deep well water extraction).
Low flow rate (limited by the number of impeller stages).
The structure is complex and requires axial force balance (for example, the use of balance plates or balance rollers).
Typical application:
water supply for high-rise buildings (gravity-driven heads are required).
Boiler feedwater (high pressure is required to deliver water to boilers).
Mine drainage (deep well water extraction).
3. Double-suction centrifugal pump
Structural characteristics: the the impeller is flanked by air intakes and liquid enters the impeller from both ends.
Performance Features:
Large flow rate (1.5-2 times that of a single suction pump of the same specification).
Low NPSH (double suction design reduces liquid velocity and lowers NPSH requirements).
Symmetrical structure, stable operation, low vibration.
Typical application:
High-flow clean water transportation (e.g., power plant circulating water, water conservancy projects).
Flood control and drainage in cities (requires a lot of rainwater to drain quickly).
Industrial cooling water system.
ii. By Principle of Work (Supplementary Explanation)
While structural classification is a mainstream approach, some applications are further subdivided according to working principle:
1. Vortex Pump (sometimes classified as a special centrifugal pump)
Structural Characteristics: The impeller is open or semi-open, radially arranged blades, forming vortex movement between the impeller and pump casing.
Performance Characteristics: Small flow rate, high water head (up to several hundred metres, flow rate only a few cubic metres perhour).
Strong self-absorption ability (no self-absorption is required to start).
Low efficiency (typically ≤35%), suitable for short-term operations.
Typical application:
Laboratory liquid transfer (e.g.
Car wash (high pressure sprinkler).
Small fountain equipment.
2. Magnetic Drive Centrifugal Pump
Structural Characteristics: power transmission through magnetic coupling, no mechanical seal, to achieve zero leakage.
Performance Characteristics:
Good sealing performance (suitable for corrosive or toxic media).
High maintenance costs (magnetic coupler needs to be replaced periodically).
Less efficient (energy loss occurs during magnetic transport).
Typical application:
Chemical Industry (transport of hydrochloric acid, sulfuric acid, etc.)
Pharmaceutical industry (avoid cross-contamination)
Nuclear Power Plant Cooling Systems (protection against radioactive leakage).
III. By Application (by Industry)
Centrifugal pumps can be further specialized according to the medium being transported:
1. Clean Water Pumps
Structure: Standard single-stage or multi-stage centrifugal pumps, made of cast iron or stainless steel.
Uses: urban water supply, agricultural irrigation, industrial cooling.
2. Chemical Pumps
Structure: Corrosion resistant materials (such as fluorine plastics, Hastelloy), sealing in various methods (such as double end mechanical sealing).
Purpose: Conveying corrosive media such as acid, alkali and organic solvent.
3. Oil Pumps
Structure: Optimized impeller design made of cast steel or stainless steel (e.g. open impellers to reduce blockage).
Uses: Crude oil transportation, fuel refueling, lubricating oil cycle.
4. Sewage Pumps
Structure: Open or semi-open impellers equipped with tearing device (e.g., carbide blades) capable of handling liquids containing solid particles or fibers. Uses: Municipal sewage treatment, factory wastewater discharge, river dredging.
Overview: Core Classification Logic of Centrifugal Pumps
Structure drive: singlestage, multi stage, double stage pump is the most commonly used classification methods in industry, directly related to pump performance parameters (pump head, flow rate).
Principle Supplement: Vortex pumps, magnetic pump, etc., through special design to meet special needs (such as high pressure, zero leakage).
Application Refinement: Select special pump type according to the characteristics of medium (corrosivity, corrosiveness, viscosity, solids content) can improve reliability and service life.