Cobra Cutterhead - Powerful & Efficient
Crisafulli
engineered the Cobra with dual opposing auger sections and hardened
steel replaceable digging tines. Two high-torque, low speed hydraulic
motors, each with 5,500 inch/pounds of digging torque, drive the Cobra
cutterhead, for a total of 11,000 inch/pounds of torque in the optional
dual drive Cobra (19,000 inch/pounds in the new Rotomite-8000).
Cobra’s
design incorporates a shroud to minimize water intrusion, and opposing
augers (which drive dredged material directly to the center, directly
in front of the pump intake) to maximize solids capture.
To
dredge compacted or hardened settled wastes, such as fly ash,
sediments, or mine tailings, select the Cobra Cutterhead, whose cutting
teeth are stronger and sharper than those on horizontal auger
cutterheads built by competitors. Less of each Cobra cutter tooth
contacts the material to be dredged to concentrate digging torque over
a smaller surface area. To ensure extended wear life, Crisafulli
hardens the surface of the leading edge of the Cobra’s cutter teeth,
the edge that does the real cutting work.
Depending
on horsepower and pump size, a Cobra Cutterhead on a FLUMP or
Rotomite-6000 can process up to 150 cubic yards of sludge per hour,
and, on the Rotomite-8000, a Cobra Cutterhead can process up to 325
cubic yards of sludge per hour. Crisafulli believes its Cobra
Cutterhead is the most effective horizontal auger cutterhead offered by
any manufacturer worldwide.
Shown
above is the 8.5 foot Cobra Cutterhead. Notice the shroud above and
behind the auger. Optionally. the cutterhead can have a special coal
tar epoxy coating. Notice, too, the hydraulic motor mounted on the end
of the cutterhead that drives the auger. The Cobra Cutterhead helps
make FLUMPs and Rotomites powerful and efficient sludge removal systems.
Weed Cutterhead - Auger Style
When your canal or pond is choked
with aquatic vegetation, and you must also remove the sediment, sludge or silt
which has settled to the bottom, Crisafulli provides the perfect solution. You
can handle weeds & wastes at the same time, with a Weed Handling Cutterhead
mounted on your SRS dredge. Designed to cut, dredge and pump simultaneously,
this weed handling system is designed to be self-cleaning. As the cutting teeth
pass through a steel comb assembly, the comb actually removes the weeds from
the teeth & feeds them to the pump. Of course, both the teeth & combs
are easily replaceable, for minimal maintenance and optimum performance. This
Crisafulli Weed Handling Cutterhead is available in 96 inch and 102 inch dth
configurations, for use on Crisafulli FLUMPs and ROTOMITEs.
Reel Type Weed Cutterhead
To deal with the widespread problem of removing
or harvesting aquatic vegetation, in collaboration with a vendor with years of
experience with reel type lawn mowers, Crisafulli developed a unique and
patented weed cutterhead for Rotomites and FLUMPs. Crisafulli’s new and improved weed handling cutterhead incorporates
a proven
“rotating reel” design which shears material along the length of an adjustable
bed knife to ensure uniform handling and shearing. The Weed Cutterhead utilizes
no vertical tines, virtually
eliminating grabbing and wrapping of weeds and
stringy, fibrous materials.
The cutterhead integrates an open intake feature
that ensures passage of solids and sheared materials and prevents clogging.
Crisafulli offers the new Weed Cutterhead in single or dual motor
configurations with cutting torque of up to 11,000 inch/pounds. See image above.
Vacuum Cutterhead
Engineered very much like the suction head on a vacuum cleaner you might have at home, the
Crisafulli
Vacuum Front-End comes in a range of sizes to meet the customer’s
needs. The dimensions of the siphon width and opening are engineered to
customer specifications and will depend on the application. The suction
is influenced by the depth of the cutterhead below the surface of the
water. The Vacuum Cutterhead can process up to 100 cubic yards of
sludge per hour with near zero turbidity. The Vacuum Cutterhead is
designed to work only with the Crisafulli Pond Liner Protection System,
and is most effective when used in applications where the solids are
only loosely settled on the pond bottom.
Shown
above is a vacuum “cutterhead” attached to a FLUMP under construction
on the Shop floor in Glendive, Montana. The pump is visible directly
behind the triangular vacuum head, which, in turn, is mounted on the
Crisafulli Pond Liner Protection System - i.e., the two wheels
connected by an axle.
The Vacuum Cutterhead shown above attached to a FLUMP built in 2003 for a major US industrial company.
Siphon Manifold Front End
Commissioners of Public Works, City of Charleston, South
Carolina purchased a standard duty FLUMP and
removed and replaced the
cutterhead with a siphon manifold. The modified FLUMP enabled the City to
remove solids from its Hanahan Water Treatment Plant at a rate of
300 to 500 gallons per minute on a daily basis without affecting water quality.
Thereafter the City purchased a second FLUMP and made the same modification to
the cutterhead. The two units enabled the City to solve two major problems at its
Hanahan Water Treatment Plant - (a) keeping the two major basins in service
while removing solids on a continuous basis, and (b) eliminating a frequent
solids loading problem enabling the City’s solids handling facility to function
as designed without overload. Now, with the use of the modified standard duty
FLUMPS, the City only drains the basins annually for a scheduled routine
cleaning and maintenance. See Siphon Manifold.
Pond liner protection system
Since many municipal and industrial settling ponds are lined with an impermeable membrane
rather
than concrete, Crisafulli engineered a pond liner protection system
that prevents the cutterhead from cutting or damaging the pond liner.
The Crisafulli Pond Liner Protection System (“PLPS”) can be attached to
any Crisafulli cutterhead. Comprised of two small wheels mounted on an
axle, the PLPS raises the cutterhead a few inches above the pond liner
and enables the cutterhead to roll along the pond bottom. See image on
right showing Pond Liner Protection System on a FLUMP.