A cutter suction sand dredger is a hydraulic driven dredger that uses centrifugal pumps with a rotating cutter head to loosen, lift and transport slurry material.
Cutter suction sand dredgers may have a pontoon hull without a means of propulsion (non-propelled), or be self-propelled, sea-going specially designed vessels. Whether self-propelled or not, the cutter will be moored with spuds or anchors while at work, then the dredging operation takes place with the cutter in a stationary position.
CUTTER HEAD
The cutter suction sand dredger is equipped with a cutting device known as a cutter head. The cutter head is a mechanical rotating tool, which is able to cut hard soil or rock into fragments. It is mounted in front of the suction head and rotates along the axis of the suction pipe. This rotation disaggregates, i.e., separates, and excavates the soil which is then drawn into the suction pipe as a solid/water slurry and pumped to the surface.
Different cutter heads are designed for specific types of soil, because hard soil, non-cohesive or cohesive soils have different requirements. Dredging in hard soils will cause wear and tear so that cutter teeth need to be replaced regularly.
SPUD POLE
During operation the dredger moves around a spud pole by pulling and slacking on the two fore sideline wires. At the same time they cut with an accurate profile because of their movement around the spud. The spud stays in the same spot allowing the dredger to make concentric circles during swinging.
TRANSPORT OF MATERIAL
The material dredged by a cutter is usually transported hydraulically through a pipeline, although some cutters have barge-loading facilities as well.
The dredge pumps produce the flow required to lift the dis-aggregated material from the bed, then a water-soil slurry can be to transported through a pipeline from the dredger to a discharge point. By use of dredge booster pumps in the discharge lines, they can transport and place materials at considerable distances from the work site.
ADVANTAGES
The most powerful cutters can dredge hard rock effectively on a continuous basis. The self-propelled CSDs can travel long distances and be deployed in remote locations, far from their home port, making them flexible to be used all over the world. They can work in shallow waters and they also have flexible discharge alternatives.
Small and medium size Cutter Suction Sand Dredgers can be dis-mountable and transportable over land. The hull is then comprised of a series of pontoons, with the one pontoon containing the machinery.
TYPES OF MATERIAL
Cutters are powerful and are capable of dredging all kinds of material including hard rock. They are able to effectively dredge silts, clays, sand, gravel, cobbles, fractured rocks and sound (unfractured) rocks.
LIMITATIONS
Cutter suction dredges are sensitive to rough seas and are not easily moved whilst working.
PRODUCTION RATES
Cutter Suction Sand Dredgers characteristically have high production rates and the ability to effectively handle a wide range of materials. The production capacity designed is, of course, directly related to the hardness of the material that the cutter is going to dredge.
PROJECT APPLICATIONS
Cutter Suction Sand Dredgers are used wherever the seabed is hard to dredge. They are used for larger dredging projects such as navigation channels and port development and maintenance and land reclamation.
About OCEAN Pump
Tai’an Ocean Pump (OCEAN Pump) Co., Ltd. is the leading sand pump and sand dredger solutions manufacturer, supplier and exporter in China. We have more than 30 talented sand pump experts and 15,000 square meters factory. More than 4 series 20 kinds of dredge pumps, slurry pumps, sand dredger machines and related parts had been manufactured to satisfy your pumping requirements.
Product innovation and customer satisfaction are our continuous commitment to all our partners. OCEAN Pump is the Certification of New Hi-tech Enterprises by the Government. We provide our customers with a complete set of sand, slurry, gravel pumping solutions and related parts. They are widely used in mining, metallurgy, coal washing, power plants, sewage water treatment and dredging in such industries as mine, chemical and petroleum. We are looking for pump dealers all over the world.
