Industrial pumping

Reliable pumping for municipal grit and sludge

Prevent clogging and reduce wear in your headworks and sludge handling circuits with heavy-duty KREBS® pumps. Originally designed for the toughest mining slurries, our recessed impeller and heavy-duty centrifugal pumps easily handle abrasive grit, large solids and stringy materials found in municipal wastewater plants.

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Key benefits of municipal grit and sludge pumps

Our grit and sludge pump solutions

KREBS® hMAX (Recessed impeller pump)

The KREBS® hMAX is the primary choice for headworks, grit removal and scum pumping, where large solids and stringy materials cause standard pumps to clog. Its recessed impeller ensures that most solids do not even touch the rotating vanes.

Models

Compare grit and sludge pump solutions

hMAX
hMAX
millMAX
millMAX™
Primary duty
Grit removal, scum, rags, digester circulatio
Abrasive grit transport, high-pressure sludge transfer
Solids handling capability
Handles large, fibrous solids without clogging
Handles fine to medium abrasive solids efficiently
Impeller type
Recessed impeller (vortex action)
Closed impeller with wear ring technology
Efficiency profile
Minimal particle degradation
Lowest power cost per tonne pumped

Performance & compliance of municipal pumps 

Performance standards

KREBS® pumps are rated for continuous duty in harsh environments. The heavy-duty bearing assemblies are designed for a minimum L10 life of 100,000 hours, far exceeding typical municipal specifications. The recessed impeller design allows the pumping of slurries with high entrained air contents (up to 30%) without air-locking, common in digester and scum applications.​

ISO certifications

Manufactured under ISO 9001 quality standards. Available with documentation for municipal tender compliance.

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Technical suitability for municipal pumps

1. Materials and media handled

  • Grit & sand: Handles highly abrasive inorganic solids (specific gravity > 2.5) typical of grit chamber underflow.​
  • Rags & fibres: Large internal clearances in hMAX models pass stringy materials and wipes found in raw sewage and scum.​
  • Shear-sensitive sludge: Gentle hydraulic action preserves floc structures in RAS/WAS lines.

2. Operating and environmental conditions

  • Suction conditions: Excellent NPSH performance; hMAX resists air-binding in foamy or gas-entrained fluids (digesters).​
  • Installation: Suitable for dry-pit installation; robust frames tolerate vibration and variable loading better than standard water pumps.

3. Tolerances and protection

  • Wear protection: Thicker liners and impellers (high-chrome or rubber) provide wear life 2–3x longer than standard cast iron sewage pumps.

 

Maintenance & service

Simple, field-friendly maintenance with global support

Designed for simple maintenance in the field. The millMAX™ features an externally adjustable wear ring that allows operators to restore pump efficiency in minutes while the pump is running, without needing to shim the impeller.​ Back-pull-out designs allow the rotating assembly to be removed without disconnecting piping. Our global distributor network ensures rapid access to spares and wear parts near your facility.​

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Frequently asked questions

FAQs for froth pumps

Mining pumps are built for extreme abrasion. In grit and headworks applications, they last significantly longer than standard non-clog sewage pumps, reducing lifecycle costs.

Yes. The KREBS® hMAX features a fully recessed impeller that leaves a large open passage through the casing, allowing rags and fibrous solids to pass without catching on vanes.​

The hMAX recessed impeller creates a vortex that naturally separates air from the fluid, allowing it to pump slurries with up to 30% entrained gas without locking.

Answer