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gravelMAX Centrifugal Slurry Pump

The gravelMAX™ centrifugal slurry pump has a unique patented design developed to handle larger particles.

gravelmax dredge slurry pump
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Casing - designed for minimum slurry turbulence and even wear. Includes integral wear ring, carrier, and adjustment screws for on-line adjustment and elimination of suction side recirculation.

Wear Ring - adjustable wear ring assembly to permit closing of suction side impeller clearance during operation. This reduces slurry recirculation and lowers pressure at the suction area, thereby maintaining flow and reducing wear.

Impeller - designed for high slurry efficiency and hydraulic performance. Machined surface at the eye for wear ring adjustment and high expelling vanes

Backliner (dependent on pump size) - designed for close clearance at the back. Matching full impeller diameter and profile for close operating clearance. 

Wear Parts
- designed hydraulically to wear evenly. Constructed of high chrome at 680/720 Brinell hardness. 

Power Frame
- heavy duty cast iron pedestal with external bearing assembly adjustment mechanism. Drilled for overhead motor mounting assembly. 

Bearing Assembly
- heavy duty shaft and indirect fitted taper roller bearings rated at 100,000 hrs B-10 life minimum. Bearing arrangement designed to prevent over greasing and ingress of slurry.

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Design Advantages

High Radial Vanes

  • Clears large solids
  • Prevents solids from being crushed
  • Reduces casing slurry pressure at the eye of the impeller
  • Reduced power consumption


External Wear Adjustment Screw

  • Four screws for on-line wear clearance adjustment
  • Adjusted while the pump is operating
  • Adjusted six to eight times during the life of the pump


Adjustable Wear Ring

  • Allows a higher percentage of solids pumped and maintained throughout the life of pump
  • Adjusted during operation
  • Reduces suction side recirculation
  • Maintain hydraulic performance


millMAX™ Power Frame

  • Heavy duty cast pedestal
  • External bearing assembly adjustment
  • Wide bearing centers
  • Heavy duty shaft and bearings
  • Double clamp


Reverse Taper Roller Bearings

  • Increases effective load span to improve life
  • Main bearing failure is due to over-greasing
  • Pumping action of taper rollers discharges grease to the outside, preventing ingress of slurry or over greasing of bearing cartridge

Increase Power & Reduce Cost

Krebs millMAX™ Pumps treat the cause of pump wear and loss of efficiency, whereas competitive pumps treat the symptoms through materials or predictive uneven wear rates.

The gravelMAX™ Pump has a unique patented design developed for severe abrasive slurries.

The gravelMAX™ Pump features a patented on-line wear clearance adjustment, which minimizes the cost-per-ton pumped compared to conventional hard metal and rubber lined slurry pumps through:

  • Pump higher percent solids
  • Maintenance of suction vacuum
  • Increase deposit life by digging deeper
  • Reduce power costs
  • Reduce the cost per ton
  • Adjust pump while running
  • Longer wear life of parts


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Total Cost of Ownership

In most established millMAX™ installations, wear life of parts has been even and in the majority, overall wear life has generally improved by 50% to 100%. This increase in wear life is achieved together with a reduction in power, generally in the 10% to 20% or greater range.

The reduction in power can then be taken as a cost savings, or through additional pumping capacity with the same installed motor.

With the millMAX™ Hybrid Suction Sealing System, the front clearance is adjusted while the pump is running, and takes only five minutes to perform. This clearance is adjusted normally six to eight times throughout the life of the wet end parts.

  Markets & Applications

  • Aggregates (Sand Plants, Cyclone Feed, Tailings)
  • Dredging
  • Coal - Especially DMCF
  • Froth (where air disbursement is a priority)
  • Heavy-duty abrasive slurries
  • Any application requiring the passage of large particles


Please click the link and a Sales Representative will get back to you as soon as possible.  KREBS Inquiry Form


FLSmidth Krebs, Inc.  (Main Office)
5505 W. Gillette Rd.
Tucson, AZ 85743-9501 U.S.A.

Phone: +1-520-744-8200
Fax: +1-520-744-8300

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millMAXTM Pumps 

Add a millMAXTM pump to your separation process and watch your pumping costs drop.  As a leader in cyclones technology, we make sure your pumping system optimizes your separation requirements.

KREBS gMAXTM Hydrocyclones     

Optimum cyclone performance relies on minimizing turbulence while maximizing tangential velocity. Krebs primary focus is proper design, selection and application of hydrocyclone systems to provide the best product to our customers.

TechnequipTM Valves 

The Technequip knife gate valve is a true bi-directional slurry knife gate valve. It's massive rubber sleeves were designed to seal and withstand the harsh abrasive duty inherent in mining and milling facilities.


gravelmax dredge slurry pump