How Are Chemical Pumps Classified? Complete Classification Methods and Selection Guide for Chemical Pumps

Chemical pumps are core equipment used in chemical, petrochemical, pharmaceutical and environmental protection industries to transport corrosive, high-viscosity, particle-laden, flammable and explosive media. Many technical procurement personnel tend to confuse pump models during type selection. Omron Tech Pumps, an expert in fluid equipment, has sorted out a complete classification and selection framework based on practical working conditions.

I. Classification by Working Principle and Structure

This is the most widely adopted industry classification standard, which divides pumps into three categories: vane pumps, positive displacement pumps and special pumps.

1. Vane Pumps

Vane pumps deliver media by centrifugal or axial force generated by rotating impellers. They feature stable flow rates and easy maintenance, making them the mainstream pump type in factories.

• Centrifugal pumps: General-purpose basic models, suitable for clean water and slightly corrosive low-viscosity liquids, applied to conventional processes with large flow rates and medium-low heads;
• Vortex pumps: Low flow rate and high head, used for micro pressurization in fine chemical processes; mixed flow pumps balance flow rate and head with strong versatility; axial flow pumps are designed for large-flow low-pressure circulating water supply;
• Magnetic pumps and canned motor pumps: Shaft-seal-free with zero leakage, applicable for toxic, explosive and high-risk media. Omron Tech Pumps’s leak-free series boasts mature applications under such working conditions;
• Anti-corrosion centrifugal pumps: Lined with fluoroplastic or made of stainless steel, for transporting strongly corrosive liquids such as acids and alkalis.

2. Positive Displacement Pumps

Positive displacement pumps transfer materials through volume variation of pump chambers. They deliver high pressure and precise flow rates, and are not affected by medium viscosity.

Reciprocating pumps withstand high pressure for high-pressure precision batching; gear pumps are suitable for grease transportation; screw pumps operate smoothly without flow pulsation, ideal for high-viscosity materials including resins and coatings. Omron Tech Pumps provides mature screw pump solutions for high-viscosity working conditions; diaphragm pumps feature particle resistance and corrosion resistance, widely used in sewage treatment and fine chemical industries.

3. Special-Type Pumps

Designed for niche extreme working conditions: electromagnetic pumps for conductive liquid media; jet pumps for vacuum suction; air lifts for easily crystallizable materials; liquid ring pumps matched with vacuum production lines.

II. Classification by Practical Application

1. Process pumps: Core equipment of production lines, including feeding pumps, circulation pumps, sewage pumps and finished product transfer pumps running through the entire production process;
2. Utility pumps: Supporting factory equipment such as cooling tower circulation pumps, fire pumps and water intake pumps to guarantee basic factory operation;
3. Auxiliary pumps: Unit lubricating oil pumps and seal oil pumps for equipment lubrication and pressure stabilization;
4. Pipeline transfer pumps: Booster pumps for long-distance raw material transportation and vehicle loading/unloading.

III. Classification by Wetted Material

The wetted material directly determines corrosion and temperature resistance:

1. Metallic pumps: Made of 304/316L stainless steel or cast iron with cost advantages, suitable for clean water and mild acid-alkali media;
2. Non-metallic pumps: Constructed from fluoroplastic or PP, resistant to strong acids and alkalis, the preferred choice for pickling and fine chemical processes;
3. Special alloy pumps: Fabricated from duplex steel or titanium alloy, resistant to high temperature and high pressure. Omron Tech Pumps offers special alloy pumps for high-end special working conditions.

IV. Classification by Transported Medium

• Anti-corrosion pumps: For acids, alkalis and organic solvents;
• High-viscosity pumps: Mainly screw pumps, diaphragm pumps and gear pumps;
• Leak-free pumps: Magnetic pumps and canned motor pumps for flammable, explosive and toxic media;
• Particle-handling pumps: Diaphragm pumps and slurry pumps with anti-clogging and wear-resistant performance;
• High/low temperature pumps: With excellent sealing and temperature resistance for heat transfer oil and low-temperature liquefied gas.

V. Classification by Seal Structure

1. Mechanical seal pumps: Low cost, suitable for common non-highly toxic media;
2. Magnetic seal-less pumps: Zero leakage, safe and environmentally friendly;
3. Canned motor pumps: Fully enclosed structure, applicable for high-pressure and ultra-high-risk working conditions.

VI. Quick Selection Comparison Table

1. Large flow rate and conventional media: Centrifugal pumps, mixed flow pumps, axial flow pumps;
2. High-viscosity, high-pressure and quantitative transportation: Screw pumps, gear pumps, diaphragm pumps;
3. Toxic and explosive media: Magnetic pumps, canned motor pumps;
4. Strongly corrosive media: Fluorine-lined pumps, stainless steel pumps, special alloy pumps;
5. Vacuum and special conductive media: Jet pumps, electromagnetic pumps.

Conclusion

Chemical pumps can be classified from five major dimensions: structural principle, application scenario, wetted material, medium characteristics and seal structure. Each working condition corresponds to a dedicated pump model. Improper pump selection may lead to leakage, clogging, shutdown and other failures, disrupting stable production. Contact Omron Tech Pumps’s technical team for professional solutions if you have any questions about pump selection.