Common Questions about Dredges

Q:  What kinds of dredges does Crisafulli make?
A:  Hydraulic dredges with horizontal auger cutterheads; diesel-hydraulic and electrically powered models.

Q:  What sizes do Crisafulli dredges come in?
A:  Remote-controlled FLUMP is available in 3" (standard and severe-duty) and 4 inch (severe-duty) pump sizes x 4" or 6" discharge, respectively.  The Rotomite SD-110 is equipped with a 4" pump x 6" discharge.  The Rotomite 6000 and the Rotomite 6000C are equipped with a 6" pump x 8" discharge.

Q:  What is a FLUMP?
A:  FLUMP stands for "Floating Lagoon Pumper".  It is a remote-controlled dredge.  An operator runs the FLUMP from a hand held radio remote control.  It is described as an "unmanned" system because no operator is on the floating platform.  FLUMPs are typically electric powered.

Q:  What is a Rotomite dredge?  How is it different from the FLUMP?
A:  Rotomite dredges are manned ("operator on-board") self-propelled, steerable dredges that can operate without a support vessel.  Normally, these models are Diesel-Hydraulic powered, though a few are offered in "all-electric" customized versions.

Unlike the FLUMP, and most conventional dredges, the Rotomite does not require a cabling traversing system for movement.  For the customer's convenience and to increase versatility, Rotomites are designed to operate as either cabled or free standing (not cabled) dredges.

Q:  How deep can I dredge with a Crisafulli dredging system?
A:  Dredging depths are 10 feet with a standard duty FLUMP and 12 feet with a severe duty FLUMP.  The Rotomite SD-110 will dredge up to 12 feet and the Rotomite 6000 will dredge up to 20 feet.  Crisafulli's newest model, the Rotomite 6000C reaches a depth of 23 feet.  Greater depths are available as custom dredges. 

Q:  How much material can be dredged with a Crisafulli dredge?
A:  FLUMPs can dredge 25 to 80 cubic yards per hour and Rotomites can dredge up to 150 cubic yards per hour.

Q:  How far can the dredged slurry be pumped without a booster pump?
A:  Typically Crisafulli dredges will pump slurried material up to 1,500 feet, dependent of course upon the site conditions and slurry.

Q:  What is a good application for a Crisafulli dredge?  Is it right for my needs?
A:  Crisafulli dredges are used to dredge a wide variety of materials in both industrial and municipal settings.  Crisafulli dredges are installed in some of the world's most demanding environments.

Common applications for Crisafulli Dredges:

  • Residuals from potable water treatment plants
  • Biosolids from wastewater treatment plants
  • Runoff ponds, basins and lagoons
  • Mines (for the management of tailings)
  • Power plants (for fly ash ponds and sedimentation ponds)
  • Refinery and petrochemical wastes
  • Processing plants (Food processing; Rendering; Slaughterhouses)
  • Metal processing wastes
  • Chemical sludges
  • Marina and canal maintenance

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