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Deepwater Dredging Systems

Dredging activities have been expanding their horizons with the increasing need for equipment suitable for extracting materials from deep water. Dragflow dredging systems are a proven technology in deepwater dredging and mining projects.

High-depth Dragflow systems for offshore applications

Dragflow’s engineering department can provide complete solutions for high-depth mining and dredging applications.

Dragflow is committed to develop and engineer systems that would allow our equipment to reach new level of depth and performances. With this system, our equipment can reach more than 600m without losing performance while at the same time being protected by the water external pressure.

Our high-depth systems, powered by hydraulic power packs or generators, include hydraulic or electric pumps, hydraulic or electric cutters, high-pressure water jets and anti-turbidity bells.

The DRAGFLOW trench system includes multiple hydraulic pumps attached to a steel frame with a protective shield. This symmetrical and reversible system uses a special version of our classic HY85 pump, modified for increased performance. The solution is unique and can be used in different ways according to specific needs.

Every pump is assisted by two attached hydraulic excavators.

The trench can be used to pipe maintenance in offshore projects.

It can be easily moved along the whole length of the pipes lying on the seabed, to complete the sand extraction. Once the maintenance is over, the same equipment will put the sand back to cover the pipes.

High-efficiency submersible dredge pumps

Dragflow submersible dredge pumps have been designed and built to work especially in harsh conditions where generally normal pumps cannot operate. Our advanced design, which includes agitators, hydraulic cutters and pressure compensation of all equipment, allows for high-efficiency dredging, even in deep sea conditions.

The Dragflow agitator enables our pumps to rise and convey liquids and mixtures such as mud, slime, silt, sand and gravel with sizes up to 120mm. Compensated excavators permit the removal of compact material even in high-depth dredging.

Our pumps can work in very harsh and demanding conditions thanks to the special materials that are used to construct them. The agitator, impeller, and lower and upper wear plate are made of cast iron, including 30% chrome. This means they have a hardness of about 600HB / 650HB and, as a consequence, an incomparable abrasion resistance.

Heavy-duty submersible pumps

Heavy-duty submersible pumps with agitators are available either in hydraulic or electric versions:

  • Electric version power output: from 3.7kW up to 110kW
  • Hydraulic version power output: from 9kW up to 300kW

Pumps can be equipped with hydraulic cutters which, coupled with the agitator, stir up the solids settled on the bottom in order to be easily pumped out, creating a homogeneous mixture with a higher percentage of solids and achieving a higher efficiency.

Pumps and cutters can be pressure compensated in order to allow dredging activities when the working depth is higher than 100m.

Heavy-duty submersible pump systems for offshore and deep sea dredging

Heavy-duty submersible pump applications in dredging include the removal of sand and silt during piling / drilling activities; sand and gravel extraction; dredging of harbours and dams up to 300m depth and 120mm cross-section; dredging of contaminated sediments; and pumping bentonite slurries.

Dragflow can provide complete dredging systems, which include a hydraulic power pack specifically designed for the long hydraulic lines and harsh conditions typically connected with deep sea and offshore projects. All power packs can be wirelessly remote controlled for the convenience of operators during dredging activities.Customized Hydraulic equipment for the offshore industry

Customised hydraulic equipment for the offshore industry

Dragflow designs diesel or electrically-driven hydraulic power packs according to customer specifications. Power packs with or without hydraulic reservoirs, filtration systems with warning light for filter clogging, lubrication systems and local control or remote wireless control panels. Power Packs can be delivered skid-mounted, completely containerised and with sound attenuation.

In addition Dragflow provides spooler system for oil hoses and umbilicals. Dragflow assures in-house assembly and testing and customers are welcome in our facilities during production phases.

Modular and transportable dredgers

Dragflow leads the field with the innovative design of systems that can improve productivity, minimise downtime and allow high working depth. Our products are well-known for pumping large quantities of solids with the agitator and the cutters, which put in suspension the material settled at the bottom. Dragflow dredges can work in deeper waters than any other dredge and deliver a higher quantity of dry tons per hour.

All Dragflow dredges are designed and manufactured in modular and transportable units. The use of simple components means low cost and ease of maintenance, simplicity to repair possible breakdowns, and less expensive spare parts.

Customised dredges for the offshore industry

As a result of the flexibility of our equipment and modularity of its components, Dragflow can manufacture different types of dredges to comply with different client requests. On demand, we can supply dredges in accordance to the rules of the Italian Naval Registration (RINA).

Dragflow dredges can be remote controlled in order to minimise labour and maximise the production of solids at the set flow rate.

Beibu Gulf Project, China

The Beibu Gulf Project consists of three oil fields in block 22/12, which is located approximately 60km from the southern coast of China and north-west of Hainan Island.

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18 November 2011

Dragflow Understands and Works for Social Responsibility

Dragflow is a world player in solid pumping solutions with over 25 years of experience in manufacturing heavy-duty pumps and complete dredging equipments, focused on the continuous development of its design and manufacturing activities for dredging, mining and industrial sectors. But t

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