Four new contracts for DragflowContracts & Tenders // January 12, 2017
The last quarter of the 2016 was a busy time for Dragflow as the company secured four contracts for custom-made dredgers.
A contract for five model DRH300E23 dredgers has won for sand and gravel extraction in Middle East. The dredgers are equipped with a Dragflow hydraulic pump, model HY300, and a CAT C13 engine. They will operate at a depth of -40m and deliver material over a distance of 1km via a 350mm hose.
A second contract has been signed with a leader in processing aggregates for concrete, cement and asphalt production, with facilities in 90 countries. The company selected a DRP120 remote controlled dredge equipped with a Dragflow EL1204 eletric pump with EXEL20 excavators to dredge a settlement pond, fed by the aggregates washing plant.
"Our dredging system is unique thanks to the compact dimensions that still guarantee optimal performances. Based on the client's request, the Dragflow dredge can be controlled remotely or through the on-board panels, and it includes a PLC that supervises all parameters and the dredge location during the operation. In case the side excavators are blocked with material or large objects, these can be unblocked automatically by the PLC inverting the cutter heads rotational direction. The dredging unit can also work partially outside the water, thanks to the custom-designed water cooling system of the dredge. The dredge is also equipped with a high-pressure water jet-ring system to dredge the mud also when the water level is minimum," the company said.
One of the world's largest mining companies ordered a DRH85/160E22 dredge for an iron ore mine in Brazil. The iron ore, mixed with water, is pumped from the mine to the shore for more than 500km through a mineral duct pipeline. Once the mineral arrives at the port terminal it is separated from the water and loaded on barges for ocean transportation. Along this long pipeline there are some booster stations and speed control valves. When those are under maintenance they need to stop the pumping to the shore and material coming from the plant is diverted and discharged into tailing pond. This is where the dredge will be positioned.
The iron tailings will be dredged and returned to the circuit going to the coast. It is crucial for the project to maintain the maximum capacity of this pond in case they need to deal with emergencies. The tailings have a high iron content, with specific gravity up to 4,9 kg/dm3. Only a super duty dredging pump with an oversize motor could do the job. The dredging unit consists of a HY85/180 hydraulic pump with two EXHY20 hydraulic excavators and jet-ring system. The hydraulic power pack on the dredge is equipped with an electric motor and the power cord is floating from the shore to the power pack. The dredge can be controlled by one operator inside the control cabin or directly from the shore through a wireless joystick.
Dragflow also recently delivered two DRP60 remote controlled dredges to the largest phosphate mining company in Morocco. The dredgers have a capacity of 400m3/h as well as a water jets system to help break the settled material and increase the overall efficiency of the project. The dredgers will be used on two tailing dams to pump processed phosphate ore back the plant for reprocessing. The dredgers are part of a slurry pipeline in which three other Dragflow pumps are being used, including a 300hp electric submersible slurry pump.