ANDRITZ OEM Precision Sand Casting Slurry Pulp Pump Semi Open Impeller

Our technical brand delivers complete fluid machinery solutions under a single accountable partner — covering component supply, system integration, and international field support. The product portfolio includes pumps, frequency converters, servo drives, PLC-HMI automation platforms, motor control centers, electric motors and gearboxes, mechanical seals and assemblies, couplings, and gear transmissions. Field services include overseas FARO 3D scanning, laser alignment, pump commissioning, and on-site troubleshooting by our own engineers.

ANDRITZ Semi-Open Impeller is a hybrid impeller design featuring vanes attached to a back shroud, with a partial front shroud covering only the hub region rather than the full vane tip width. This configuration occupies a middle ground between the fully open impeller (no front shroud) and the fully closed impeller (full front shroud over the entire vane profile).

The semi-open design provides a combination of attributes that make it particularly suitable for ANDRITZ pumps handling fluids with moderate solids content:

• The partial front shroud improves hydraulic efficiency over a fully open design by reducing tip recirculation losses
• The exposed vane tips at the OD retain solids passage capability that would be restricted by a full front shroud
• The back shroud provides mechanical strength to the vane structure, reducing vibration and fatigue failure risk under variable flow conditions
• Limited axial adjustment is still possible (though less effective than a fully open impeller), as the partial shroud restricts axial repositioning range

Our ANDRITZ semi-open impellers are reverse-engineered from original parts using FARO 3D scanning, with the partial shroud profile, vane angles, and bore dimensions verified on CMM before dispatch.