Centrifugal pumps dominate the industrial fluid transportation field due to their high efficiency and stability. This guide simplifies the pump selection process through three key aspects—media analysis → parameter matching → structural optimization.
· Clean liquids (water/kerosene): Use closed impeller pumps (efficiency: 70-90%) for particle-free fluids.
· Particle-laden liquids (mineral slurry/sewage): Adopt open/semi-open impellers (clearance: 5-10mm/3-5mm) for anti-clogging performance, with efficiency ranging from 50-70%.
· High-viscosity liquids (heavy oil/slurry): Choose positive displacement pumps (e.g., screw pumps) to prevent impeller slippage.2. Corrosiveness· Mildly corrosive media (dilute acid/brine): Use stainless steel impellers + fluororubber seals, with anti-corrosion coatings sprayed on the surface.
· Strongly corrosive media (concentrated acid): Prioritize magnetic drive pumps or duplex steel mechanical seal pumps to eliminate leakage risks.3. Temperature· Normal-temperature media (-20°C~80°C): Cast iron/aluminum alloy pump casings are sufficient.
· High-temperature media (>100°C): Employ cast steel casings + center-supported structures to ensure thermal stability.
· Low-temperature media (<-20°C): Use 316L stainless steel + double mechanical seals to prevent embrittlement.
· Toxic/inflammable media: Select zero-leakage magnetic drive pumps or configurations with explosion-proof motors + anti-static impellers.
Determine the flow rate based on actual production requirements, with a 10%-20% margin reserved for operational fluctuations.
Calculate the head by comprehensively considering the transportation height, terminal pressure, and pipeline resistance.
The design pressure should be set at 1.2-1.5 times the working pressure to ensure a safety margin.
· Closed impellers: High efficiency but prone to clogging, suitable for clean fluids.
· Open impellers: Anti-clogging with lower efficiency, suitable for particle-containing media.
· Semi-open impellers: Balance efficiency and anti-clogging performance, suitable for medium-concentration slurries.
· Foot support: Low cost and suitable for low-pressure/normal-temperature scenarios, but with poor thermal stability.
· Center support: Stable shafting under high temperature and pressure, requiring precise alignment for harsh working conditions.3. Sealing Types· Packing seals: Low cost with a leakage rate of 10-20 drops per minute, suitable for non-critical media.
· Mechanical seals: Leakage <5 drops per minute, with a service life of 8,000-12,000 hours. Double-end face seals are optional for corrosive media.
We hope this guide helps you quickly master the core logic of centrifugal pump selection. If you encounter challenges in actual selection or have customized needs, please feel free to contact TEFFIKO—we offer a full range of pump products compliant with international standards and a technical team with years of industry experience, providing end-to-end professional support from scheme design and model matching to installation and debugging. Let’s explore the path of precise selection in the industrial fluid field together!
Website: //www.teffiko.com Email: sales@teffiko.com
