The environmental dredger is
suitable for dredging contaminated siltation and other pollutions which affect the environment. With
environmental concerns at the forefront and heart of the future of
dredging, the environmental dredger provides a cost effective and
efficient solution to environmental problems.
The Environmental Dredger, known as ED, was developed
through extensive research and trials in Venice, Italy, and it was found
that a concentration of up to 90% of solids could be removed, thus making
the system ideal for the removal of siltation from lakes, rivers, harbours
etc.
•Material can be pumped almost
insitu into containers for treatment •One man operation of dredger •No winch wires required - easier dredging
•Self propelled •Automatic adjusting •Environmentally acceptable in confined places
•Reservoir desilting with minimum water removal •Canal cleaning (unless heavily dumped, in which case combined machines may be
required) •Able to work in less than 0.8m of water •Running costs less than any other known system of dredging
•Acoustically covered for noise control •Full service back up
The machine is designed to dredge solid siltation and
sands with a maximum stone size up to 50mm, with the minimum of water and up to 80/90%
concentration of solid material, and to remove hydrosoil at a controlled rate which is
essential in the de-silting of reservoirs and canals etc.
To enable the machine to be completely mobile and able to work in closed environments where the use of anchors and winch wires are prohibited, specially designed
thruster units are fitted to provide the thrust for dredging in water. These units
can also be used in the local propulsion of the unit. Where water levels are
limited, dredging can still be achieved by the use of the variable speed screw head with
automatic adjusting ability.
The machine is of one-man operation, with a possible "in built" characteristic
of becoming computer controlled for operation in environments where manual operators are
prohibited.
Features, Advantages and Benefits of the
Environmental Dredger
Uses Positive Displacement pump Can pump very high concentrations of material solids, 80 -
90%, compared to 10 - 25% with centrifugal pump
Material can be pumped at a low velocity and under control, for example into containers
for ease of examination and treatment Easier to transport away, because of less water
Ideal for toxic material as less to treat or dump
Cost savings
Head can be pushed under the material Very little disturbance around the head
Less disturbance to surrounding environment
Minimal re-suspension
of contaminated material
Cost savings
Does not need winches Ideal for tight situations, e.g. canals, Marinas, Ports,
where winches hinder other traffic and manoeuvrability.
No need to re-accommodate craft in Marina whilst cleaning up
Cost savings, less inconvenience for craft owners
Has its own propulsion units No need for tug boat or workboat. Gives increased
manoeuvrability
Save on cost of workboat and on cost of manpower to operate same
Has a low draft, and no Spuds, and uses
thrusters to stay in position Easier access to places at low water, means continuity of
operation
Increased productivity
SPECIFCATION
Overall length
14.3m
Dredge pump
is hydraulically operated positive displacement pump with twin cylinder pistons to give
the following duty: output where at 45 bar 100 c/m per hr (220 tonnes) dry material
Output where at 70 bar 70 c/m per hr (140 tonnes) dry material.
Main engine and prime mover - total maximum horse power
requirements for all systems. Volvo TID 121L air cooled developing 310 kw at 1800
rpm. Acoustically covered for noise control in confined spaces.
Overall height
3.3m
Hull length
13.0m
Hull width
3.5m
Hull depth
1.35m
Mean draught
0.8m
Max dredge depth
7.0m
Total weight
25 tonnes
External pipeline
178mm
Internal pipeline
153mm
Systems Automatic
hydraulic through engine mounted 4 way splitter gearbox with independent systems for
dredgepump, jet thrusters, cutter drive (variable), arm lift.
Thrust/propulsion units twin thruster jet units
developing 10675 N thrust at 950 RPM at 150 BHP
Systems automatic hydraulic through engine
mounted 4 way splitter gearbox with independent systems for dredgepump, jet thrusters,
cutter drive (varibale) arm lift.
Thrust propulsion units twin thruster jet
units developing 10675 N thrust at 950 RPM at 150 BHP.
Dredge arm dredge pump rigid steel
construction with integral positive displacement double acting dredge pump, controlled
through hydraulic lift cylinders.
Control Cabin completely sound insulated,
with control panel containing all engine, hydraulic pressure, propulsion and screw head
speeds. The dredger is controlled by electro hydraulic joy sticks which operate all
the systems from one position, i.e. thrust, speed and direction, port and starboard and
astern, dredge pump control, arm lift and lower and cutter head speed.
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