Six "front-end" configurations are offered with the FLUMP and Rotomite sludge removal systems – (1) the powerful "Cobra" cutterhead; (2) an Auger type weed cutterhead, (3) a Reel type weed cutterhead, (4) a siphon manifold, (5) a vacuum or suction system, and (6) a pond liner protection system. Each front-end is offered in a range of sizes, materials, and coatings. For example, the Cobra cutterhead is available in widths of 4 feet, 8.5 feet, and 11 feet. Crisafulli builds the Cobra from carbon steel used in most applications, or stainless steel for highly caustic environments. In addition, each front-end is offered with or without a pond liner protection system. Each front-end is engineered for maximum efficiency, reliability, and effectiveness.

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 below is the 8.5 foot Cobra Cutterhead after a day’s work at a customer’s dredging site. Notice the shroud above and behind the auger. This cutterhead has 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.