the ultimate dredging solutions provider

Proceedings of Western Dredging Association and

Texas A&M University Center for Dredging Studies

"Dredging Summit and Expo 2015"

Monday, July 13, 2015 © Dragflow 2015. All Rights Reserved. 1

The ultimate dredging

solutions providerENVIRONMENTAL DREDGING AT HIGH DEPTH

DAM DREDGING




Dredging Projects


Dredging is becoming a crucial activity for thedevelopment of our society.

Some applications include:

• Maintain efficient harbor networks

• Restore a dam’s capacity

• Open safe and efficient water-ways

However, new challenges demand not onlyefficient dredging solutions but solutions that alsoassure environmental protection.





Dredging projects cause a high and complexenvironmental impact.

Sediments under water can be pollutedby different materials:• Metals• Hydrocarbons

Therefore, if the sediments are re-suspendedwithout any type of control we put in danger thesurrounding flora and fauna.

• Bacteria• Chemical substances

Dredging Projects




Dragflow Pumps


Our advanced dredging systems achieve a highsolid concentration while maintaining low turbiditylevels during dredging operations

For more than 25 years we have been focused onthe manufacture of SUBMERSIBLE PUMPS withagitator blades, taking care of every possible detailin the functioning of these machines.

With our pumps it’s possible to handle heavymixtures, increasing the dredging efficiency andminimizing operation costs.




Our Technology


• Along the years, DRAGFLOW has become a respected andreliable name in the Dredging and Mining industriesproviding pumping solutions for clients working inspecialized sectors and under extreme conditions.

• Thanks to the experience in leading technology projects,Dragflow continuously enhances its ability to deliver high-quality products.

WE ARE CERTIFIED

DRAGFLOW invested in ISO9001 QUALITY CERTIFICATIONand in its information systems, because believes in theimportance of business processes management, not only forimproving efficiency but also to provide excellent service toCustomers.




WHY SUBMERSIBLE PUMPS?


EfficiencyThe presence of a double blade agitator directly incontact with the material enables DRAGFLOWpumps to create around the suction really highconcentrated mixture containing up to 70% byweight and 50% by volume solid concentration.

Higher solid concentrations means using theenergy to move solids instead of water.

This translates into:

• Smaller Diesel engines • Smaller discharge pipes • Lower environmental impact

• Reduced operating costs • Smaller machines • Higher solid production





Zone of low

pressure

Agitator

Mixture “cloud”

around the suction

Zone of high

pressure

How it works:

1) The AGITATOR not only preventssolids from blocking the pump inletby mixing them with the liquid, butwith its rotation with pump shaft itcreates a downward flow thatgenerates a HIGH PRESSURE AREAin front of the pump that put thesettled material in suspension thuscreating a cloud of slurry around thepump suction.

2) Above the agitator, inside thestrainer, a LOW PRESSURE AREA iscreated. This together with theaction of the impeller allows topump a high concentration of solids.

3) The SIDE CUTTERS run at low rpmand at every rotation they bringadditional material to the suction.




WHY SUBMERSIBLE PUMPS?


Versatility

Due to the own weight of the pump, it can belowered into the water simply using a hoist with asteel cable.

This together with the pressure compensator kitallows Dragflow pumps with no limitations onworking depth.

At Dragflow we also introduced an innovative double cutting system in which cutter heads turn inopposite directions cancelling the torsion as the dredging unit is balanced even if is suspendedfrom a single cable.




Environmental Dam Cleaning


Anti-Turbidity Bell

A few consequences of turbidity when dredging atdams could be:• Damage to Hydroelectric turbines due to fine

solids in suspension• Contamination of potable water sources

Dragflow’s anti turbidity bell limits the turbidity deriving fromthe dredging process to a circumscribed area.

Therefore, the disturbance of the aquatic environment is keptat an absolute minimum.




Other High Depth Systems


Pump and Cutters

Dragflow has developed a line of hydraulic andelectric pumps for high depth applications.

These pumps are equipped with a pressurecompensation system based on a hydraulicaccumulator that equals the pressure inside theseal chamber to the high external waterpressure.

A second hydraulic system mounted on the pump and cutter motors prevents abrupt interruptions of oilflow, protecting the motors and internal components.






High Depth Jet-Ring System

For additional cutting power, Dragflow pumpscan be equipped with a compensated highpressure water Jet-Ring system.

The system is composed by two main elements:

• Jet-Ring Frame with nozzles for high pressurewater jets around the pump suction

• Compensated high head pump connectedwith a special frame to the dredging unit





Umbilical Lines

When working with several long oil hoses, Umbilicalsystem are ideal to combine environmental safety andusability. It consists of a set of oil twisted around a corenon stretchable rope, which absorbs all the strains andshocks, and is covered by a protective layer.

Hydraulic reel controlled from the power pack andequipped with automatic brake for descendingand recovery for ascending operations. Rotatingjunctions and base frame for trouble free recoveryof the umbilical line.

Hydraulic Spoolers






Power Packs

DRAGFLOW variable flow Hydraulic Power Packs

are engineered for use with the DRAGFLOW

hydraulic pumps, which coupled with hydraulic

excavators make up a complete dredging plant.

Operator Cabin

Sound proof canopy

Remote control

Wireless radio control

Container construction

For low temperature (-40°C)

Options


For High Depth applications, our Power Packs have:

• Pump R.P.M flexibility due to variable oil flow

• Separate hydraulic circuits for pump and cutters

• Assisted descent of the dredging unit

• Oil boosters and oil compensators

• Container style enclosures





High Depth References

Dirillo Dam dredging (60m working depth)Sicily, Italy 2006

Project Description: Removing alluvialsediments accumulated in the lake near thedam bottom spillway.

Dragflow Product: Diesel driven dredgewith Hydraulic Pump HY300B andHydraulic Cutters EXHY35, everythingcompensated for maximum working depthof 60 mts.

Average Production: 300 m3/h of solidmaterial at 1.000 m of discharge distance.






Offshore project (120m working depth)Azerbaijan 2007

Project Description: Removing sand and silt around the jacket of an off shore platform for petroleum extraction from the bottom of the sea. Dragflow Product: Hydraulic Pump HY50Bplus cutters EXHY20 with Hydraulic Spooler,Umbilical and protective off-shore frame.Average Production: 60 m3/h of solid material at 200m of discharge distance at sea bed level.






Offshore dredging (270m working depth)Russia 2012

Project Description: Trench dredging in DeepOcean. Vessel equipped with dynamicpositioning and ROV system able to detectposition of the pump.Dragflow Product: Dredge HY85B with cuttersEXHY20S with Hydraulic Spooler, Umbilical andprotective off-shore frame.Average Production: 100 m3/h of solid materialat 270m working depth.






Dam dredging Colombia 2013

Project Description: Hydroelectric Dam de-silting.Dragflow equipment has been used onto aworking vessel equipped with cranes andpropellers.Dragflow Product: Hydraulic Pump HY85/160Bwith cutters EXHY20S with Hydraulic Spooler andUmbilical.Average Production: 120 m3/h of solid material at 500m of discharge distance.






Environmental dam cleaningAmbiesta Dam - Italy 2014

Project Description: Cleaning ofhydroelectric dam using environmentaltechniques.Dragflow Product: Hydraulic PumpHY85/160B with cutters EXHY20 andAnti-turbidity bell.Average Production: 90 m3/h of solidmaterial at a working depth of 50m.






Sand and Gravel extractionRussia 2014

Project Description: Sand and Gravelextraction.Dragflow Product: Dredge DRH400E23-14" with Umbilical line and HydraulicSpooler installed on a frontal additionalfloater.Average Production: 300 m3/h of solidmaterial at 500m of discharge distance.






Off-shore dredging Norway 2014

Project Description: Underwater excavatingfor concrete foundation at approximately100m of working depth.Dragflow Product: N.2 high depth dredgingsystem composed by Dragflow HY85B with 2cutters EXHY20 and High Depth Jet-RingSystem. Dredging unit equipped with n.2underwater cameras with lights for perfectmonitoring of the position of the pump.Average Production: 100 m3/h of solidmaterial at sea bed layer.






River dredging for mineral extractionCentral Africa 2015Project Description: Dredging operation at 50meter depth for mineral extraction. The dischargegoes into a washing plant for separating mineralsfrom other sediments.Dragflow Product:. New model DredgeDRH85/160E22DFHD with automatic hydraulicreel between operator cabin and power pack foroptimal view. Dredging unit composed byHydraulic Pump (HY85/160B) and two Excavators(EXHY20).Average Production: sand and lime 125 m3/h at600 m distance






Offshore pipeline maintenance Caspian Sea 2015

Project Description: Special dredging systemallowing sand removing along submergedpipeline.Dragflow Product: Two Dragflow HY85/180HCHigh capacity with cutters EXHY20 attached toa steel frame with a protective shield.Average Production: sand 400 m3/h at 200 mdistance from the pipeline.





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