Centrifugal pump KREBS® series

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Overview
FLS KREBS® gravelMAX™ and UMD™ pumps feature large internal clearances that enable handling of slurries with large, abrasive solids without in-pump grinding. The designs deliver increased solids-passing capability, longer wear life, maintained hydraulic performance near BEP, and lower cost per tonne pumped.

Key benefits

• Adjustable wear ring technology to control suction-side clearance in service, preventing recirculation and avoiding grinding.
• Extended wet-end wear life by eliminating in-pump grinding and maintaining performance close to best efficiency point (BEP).
• Improved solids passage from large internal clearances, wide-diameter impellers and increased cutwater clearance.

Models
gravelMAX™
Designed to prevent in-pump grinding of coarse solids with a large impeller-to-suction clearance, wide-diameter impeller and increased cutwater clearance to allow solids to pass through the pump. Offers reduced cost per tonne pumped and significantly longer wear life compared with conventional slurry pumps.

• Handles large and abrasive solids.
• Reduces cost per tonne pumped.
• Up to 100% longer wear life versus conventional slurry pumps.

UMD™ (Ultimate Mill Discharge) pumps
Optimised for mill discharge duties with hydraulics designed for high efficiency and uniform wear in abrasive mining environments. Options include wide-flow casings and multiple sizes and wear-liner materials.

• Hydraulics optimised for efficiency and even wear.
• Wide-flow casing option for broad operational duty ranges.
• Available in multiple sizes and wear-liner choices.

Features & technology

• Adjustable wear ring for quick in-service control of suction-side clearance to maintain pump performance without increasing speed.
• Large internal clearances to eliminate in-pump grinding of coarse solids.
• Wide-diameter impellers and increased cutwater clearance to improve solids passage.
• Metal wear-liner options (e.g. high-chrome alloys) recommended for coarse, abrasive slurries; selection depends on slurry and operating conditions.
• Designs suitable for quarrying and aggregate applications (sand, gravel, crushed stone).

Maintenance & service
FLS offers global service and spare-parts support, fast offsite rebuilds and on-site service engineers for performance monitoring, upgrades and operating recommendations. Services include operation and maintenance training (including wear-ring adjustment) and digital tools for condition monitoring and optimisation.

• Global availability of spare and wear parts and offsite rebuild services.
• On-site engineers for performance monitoring and recommendations.
• Operation and maintenance training, including wear-ring adjustment procedures.
• Field-friendly features such as quick-release systems and belt-tensioning to reduce maintenance time; SiteConnect mobile monitoring for real-time data and alerts.

Specifications / technical data

• Product series: KREBS® (gravelMAX™ and UMD™ models).
• Application: pumping slurries with large, abrasive solids; mill discharge; large-solids transfer; quarrying and aggregate processing.
• Key technologies: adjustable wear ring; large internal clearances; wide-diameter impeller; increased cutwater clearance; wide-flow casing option (UMD™).
• Performance: up to 100% longer wear life (gravelMAX™ vs conventional slurry pumps); up to ~10% lower power consumption in some UMD™ applications.
• Wear options: metal liners (high-chrome and other alloys) and multiple wear-liner choices per slurry characteristics.
• Maintenance features: KREBS Quick Release™ system; belt-tensioning system for quick belt changes; SiteConnect mobile monitoring for remote condition data and alerts.
• Designed to maintain hydraulic performance close to BEP throughout wear life to reduce power consumption and cost per tonne pumped.