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Pearce Pump Supply, Inc.
Special bearings for underwater operation

Pearce Pump Supply Inc.’s 14PF-N41.5UW underwater centrifugal dredge pump features a 14-inch suction, 14-inch discharge, and 41.5 inch impeller, and has been designed with special bearings for underwater operation. The “wet end” is made of 28 percent chrome alloy for extreme abrasion resistance. According to the manufacturer, the pump is highly efficient because of high tolerances in the pump design. It is capable of operating against heads of more than 200 feet and of producing in the range of 8,000 to 14,000 gallons per minute.

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Dredging Supply Co.
Works on land and water

The Amphibious dredge from Dredging Supply Co., in partnership with Wilco Marsh Buggies, is self-propelled over land and water and has a distributed track area weight of about 7 psi. The swinging ladder makes the dredge efficient and a high producer, according to the manufacturer. The dredge features an 8-by 8-inch dredge pump configuration with a 19-1/2-inch impeller size. High-strength, low-alloy, weathering plate steel is used in the construction of the pontoons. A diesel engine powers the pontoon tracks and main hydraulic pumps. The dredge can travel up to 2.5 mph on hard, dry surfaces and up to 1.0 mph in the water.

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Jonco Inc.
Separates sand from slime

The Retriever cutterhead dredge from Jonco Inc. is designed to separate the sand from the slimes and send each to a different location, according to the manufacturer. The 30,000-pound dredge is 8-feet wide and designed to be portable. It has an optimum digging depth of 26 feet below water, and can maintain up to 40 pond systems per year.

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Ellicott/Baltimore Dredges LLC
Produces 400 to 450 tons per hour

The 670 series Hydraulic pipeline dredge from Ellicott, a division of Baltimore Dredges, LLC, can produce 400 to 450 tons per hour of sand being pumped approximately 1,500 feet to duel cyclone separators, and stacked more than 80-feet high.

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Metso Minerals-Thomas Pumps
Major redesign for efficiency

Metso Minerals’ line of Thomas Dredge Pumps has undergone a major redesign to improve the overall efficiency and performance of the pump. The pump wet-end features a cantilevered design that eliminates the case feet and results in reduced assembly time and better wet-end support and pump alignment, according to the manufacturer. The cantilevered design allows for a reduction in the impeller overhang. The bearing cartridge also has been eliminated. The housing remains as a one-piece design to ensure its sealing capability for the life of the pump, and the shafts have been redesigned to make a stiffer shaft to reduce deflection. The bearing uses to double-row spherical roller bearings and a steep angle spherical roller-thrust bearing, allowing the submersible dredge pumps to have the same head capabilities as the deck-mounted pumps.

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Lovejoy Inc.
No special tools required

The S-Flex Couplings from Lovejoy Inc., with applications for pumps and dredges, doesn’t require any special tools for installation and removal. The coupling’s design is composed of three parts. Two flanges with internal teeth engage an elastomeric flexible sleeve with external teeth. Each flange is attached to the respective shaft of the driver and torque is transmitted across the flanges through the sleeve. Misalignment and torsional shock loads are absorbed by shear deflection in the sleeve. No lubrication is need for the couplings, and they dampen vibration and control shock, according to the manufacturer. Flexible sleeves for the couplings come in three designs —one-piece solid, one-piece split, and a two-piece with retaining ring design. Thirteen sizes are available with torque capabilities that range from 60- to 72,800-inch-pounds.

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Supreme Manufacturing Inc.
Works 200 feet below water

Supreme Manufacturing, Inc.’s 8-yard modular dredge features the latest state of the art equipment and can get material 200 feet below the water level. Floating conveyors can be arranged in combinations from 100 to 400 feet individual lengths and total lengths from 1,000 or more feet. The dredge can be assembled in two weeks, making it easy for a producer to move it to several locations each year, according to the manufacturer. The special design of the dredge makes most loads legal size for ease of moving and handling on the highway. Options for the dredge include crushers and hydraulic hammers, and portable generators or commercial electric power can power it. The dredge is also capable of feeding directly to a processing plant, stockpile, or truck load-out bin.

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Innovative Material Systems
System that ‘walks’

Innovative Material Systems (IMS) a division of LWT, LLC, offers two high-production, one-truck transportable sand dredges. The Model 5012 HP (pictured) is powered by a 325-horsepower diesel power unit and equipped with a GIW 8- by 10-inch submersible dredge pump. It can dredge down to 22 feet. The Model 7012 HP is powered by a 425-horsepower diesel power unit and equipped with a GIW 10- by 12-inch submersible dredge pump. It can dredge down to 30 feet. Both dredges are self-propelled with a self-propulsion system, which “walks” the dredge forward on the bottom surface.

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Rohr Corp.
Fully automatic system

Rohr Corp.’s LJ-400 luffing jib clamshell system is capable of recovering 450 tons per hour at a depth of 80 feet. The fully automatic system, however, can mine up to a maximum depth of 150 feet. It has a bucket capacity of 8 cubic yards and its hoist drive system is run by a DC variable speed. Manufactured with a modular design, this system can be easily relocated, making it idea for producers who have multiple dredging sites, according to the manufacturer. Optional features include bucket monitoring and diagnostics, one- and two-way rake grizzlies, onboard primary crushing systems, and fine sand recovery.

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Twinkle Co.
Linear cutter

Twinkle Co.’s 12-foot Crusader class sand and gravel dredge features a linear cutter rated at a 35,000-pound maximum cutter force, using a 9-inch pitch ablative digger chain. The dredge has an overall length of 154 feet and an overall width of 33 feet. Its total displacement is 314,000 pounds. The main power unit has 705 continuous horsepower at 1,800 rpm, with an accessory power unit that has 275 horsepower at 1,800 rpm. The power units are mounted on anti-vibration mounts. The dredge’s hydraulic system runs as a variable flow, 150-gallon reservoir with electro-hydraulic proportional valves.

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Reprinted from Aggregates Manager Magazine
April 2006