What is plain suction dredger?
The characteristic of a plain suction dredger is that it is a stationary dredger, consisting of a pontoon anchored by one or more wires and with at least one sand pump, that is connected to a suction pipe. The discharge of the dredged material can take place via a pipeline or via a barge-loading installation.
How deep can a suction dredge work?
The dredging depth is usually limited; the biggest suction dredger can reach depths between 25 and 30 m. The minimum dredging depth is usually determined by the draught of the pontoon.
How deep can a dredge go?
Deep Dredging to approximately 150 feet is possible, however, it does present some technical challenges that can be effectively overcome with skill and knowledge. Custom Dredge Works has tremendous experience with engineering long ladder dredges with powerful underwater ladder mounted pumps.
What is a suction dredger ship?
The trailing suction hopper dredgers (TSHDs) of Boskalis are oceangoing vessels that can collect sand and silt from the seabed and transport it over large distances. The mixture of sand and water is pumped into the hopper of the dredging vessel. Excess water flows out through so-called overflows.
How does a suction dredger work?
A Cutter Suction Dredger is a stationary dredger which makes use of a cutter head to loosen the material to be dredged. It pumps the dredged material via a pipeline ashore or into barges. The loosened material then enters the suction mouth, passes through the suction pipe and pump (or pumps) and into the delivery line.
What are the types of dredging?
There are two methods of dredging: mechanical excavating and hydraulic excavating. Mechanical excavating is applied to cohesive soils. The dredged material is excavated and removed using mechanical means such as grabs, buckets, cutter heads or scoops.
How does a cutter suction dredger work?
A cutter suction dredger cuts hard soil into fragments with a rotating cutter head. The material is sucked up by dredge pumps and discharged to a deposit area through pipelines across sea and land. During the dredging works, a spud is lowered in the seabed to secure the vessel.
How much does it cost to make a gold dredge?
The Lerners estimate rebuilding cost more than $1 million, but say that building a new dredge, presuming you could, would cost over $4 million.
How much power does a cutter suction dredger have?
The cutter suction dredger can tackle almost all types of soil, although of course this depends on the installed cutting power. Cutter suction dredgers are built in a wide range of types and sizes, the cutting head power ranges between 20 kW for the smallest to around 4,000 kW for the largest.
What kind of dredger has trailing suction pipes?
Trailing suction hopper dredgers, commonly known simply as ‘hoppers’ or ‘trailers’, have a hull in the shape of a conventional ship, and are both highly seaworthy and able to operate without any form of mooring or spud. They are equipped with either single or twin (one on each side) trailing suction pipes.
What kind of pump does a profile dredger have?
Profile or Plain Suction Dredger In its most simple form the Profile or Plain Suction Dredger consists of a pontoon able to support a pump and suction pipe and to make the connection to the offloading pipe. More sophisticated vessels have separate suction and delivery pumps, water jets at the suction inlet and articulated suction pipes.
What do you need to know about a dredger?
In its most simple form the Profile or Plain Suction Dredger consists of a pontoon able to support a pump and suction pipe and to make the connection to the offloading pipe. More sophisticated vessels have separate suction and delivery pumps, water jets at the suction inlet and articulated suction pipes.