SRS Crisafulli, Inc.

Dredging Q+A: Top 8 Questions Answered


Courtesy of Courtesy of SRS Crisafulli, Inc.

We strive to provide our customers with as much information as they need to make informed decisions about the dredging equipment they choose.

So we compiled some of the questions (and answers!) asked most frequently for your quick review.

Q: What kinds of dredges does SRS Crisafulli make?

A: SRS Crisafulli produces hydraulic dredges with horizontal auger cutterheads in two model groups - i.e., self-propelled, steerable, operator on-board diesel powered Rotomites, and remote-controlled, cabled, electrically powered, unmanned FLUMP dredges. 

Q:  What sizes do SRS Crisafulli dredges come in?

A:  The remote-controlled FLUMP comes in two sizes:  the 3-inch (standard or  severe-duty), and 4 inch severe-duty. The Rotomote SD-110 is equipped with a 4-inch pump and six-inch discharge.

The Rotomite 6000 and Rotomite 6000C models are 6x8 (a six-inch pump with an eight-inch discharge.

Q: What is a FLUMP?

A: FLUMP stands for “Floating Lagoon Pumper”.  An operator runs the FLUMP from a hand-held radio remote control, or from a shore panel connected by wire to the FLUMP.

Q: What is a Rotomite dredge? How is it different from the FLUMP?

A: The Rotomite Dredge series includes manned (“operator onboard,”) self-propelled, steerable dredges which can operate without a support vessel.  Normally, these models are diesel-hydraulic powered, although a few are offered in all-electric customized versions.

Unlike the FLUMP, the Rotomite doesn’t require a cabled traverse system to control dredge movement.  For the customer’s convenience and to increase versatility, Rotomites are designed to operate as either cabled or free-floating (not cabled,) dredges.

Q:  How deep can I dredge with a SRS 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.  SRS Crisafulli's newest model, the Rotomite 6000C, reaches a depth of 23 feet.  Greater depths are available as custom models.

Q:  How much material can be dredged with a SRS Crisafulli dredge?

A:  FLUMPs can dredge 25 to 80 cubic yards of settled solids per hour and Rotomites can dredge up to 150 cubic yards of settled solids 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, depending on the site conditions and the slurry.

Q: What is a good application for a Crisafulli dredge? Is it right for my needs?

A: SRS Crisafulli dredges are installed in some of the world’s most demanding environments, and dredge a wide variety of materials in both industrial and municipal settings.

SRS Crisafulli dredges are frequently used in the following applications:

-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

If you have a question that wasn’t answered in this list go to: Dredge Q+A

Learn more about our dredges here:

Unmanned, remote controlled electric dredges for industrial and municipal lagoon maintenance

Self-propelled diesel dredges can dredge about anywhere without cumbersome cabling

Self-propelled, manned, 6' diesel dredge for abrasive slurrries

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