Deriplast Dredging

Production of complete dredging solutions

Thanks to the know-how acquired over the years, the specific skills developed in the dredging sector, the systematic and analytical control of each production phases – from the verification of raw materials to the assistance during the testing phase – DERIPLAST GROUP DREDGING is the only world partner in the dredging sector able to directly produce complete pipeline and provide turnkey solutions.
DERIPLAST GROUP DREDGING is able to support the partners in the various phases of the dredging operation: for every specific project requirement.

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Design assistance job

Design assistance job: site verification, processing of bathymetric and sedimentological model, granulometric analysis of the material to be dredged, research of the best technical solutions thanks to the help of a team of designers and specific calculation software for any specific dredging projects.


Selection and verification of the most suitable raw material for the production of the pipes used for the dredging projects.


Production of each component composing the dredging pipeline (pipes, stub ends, fittings, floats etc.), and organization of the transport to any part of the world.


Welding and assembly of all the necessary accessories for the work are made inside DERIPLAS FACTORY. DERIPLAST has a team of professional welders that are often called to assist the welding phase on site by the clients.


Transport to the job sites based in any region of the world either by truck or container.


Technical assistance on site during pipeline installation and testing.


is an operational unit of DERIPLAST GROUP specialized in providing integrated solutions for dredging systems.
DERIPLAST, founded in Villadose (Rovigo – IT) in 1960, was among the first companies in Europe to produce polyethylene pipes for civil and industrial use.

For 60 years Deriplast has been producing HDPE pipes and accessories from DN 20 mm up to DN 1200 mm for various uses – aqueducts, gas pipelines, industrial and civil wastewater lines, fire protection installations, biogas pipelines, drainages, irrigations, cable conducts and DREDGING – counting the most prestigious references in the international field and having acquired, also due to the experience gained within the Swiss multinational group GEBERIT, world leader in the sector, the technical know-how necessary to develop a wide and complete range of water collection and management solutions.

In 2017 the DERIPLAST GROUP became part of the galaxy System Group, leader in Europe in the production of complete pipeline systems, which includes over 20 companies in Italy and abroad, each specialized in the production of pipes and components for any field of application.

Was created in a small town inland of Pesaro (ITALY) as a result of an idea by entrepreneur Alvaro Boscarini.
System group was formed at the beginning of the 1990’s when, after 12 years as a major player in the production of polyethylene pipes, Centraltubi was joined by the first of the rest of the Group.
These were to be the first steps on the road to success which, in the following years, saw the birth of System Group. The nine well-integrated Italian companies soon made their presence felt in the sales and production sector, offering their clientele a range of solutions able to satisfy all construction needs of underground networks for conveying fluids and cable protection. With the state of the art machinery and employing highly qualified well-trained personnel right from the start, the factories were soon able to provide products of the highest quality.
In response to the ever increasing demand, SYSTEM GROUP then expanded its sales network to other countries, with the construction of new production plants in Spain, France, Romania and recently, in South Africa. SYSTEM GROUP constant and continous strives to achieve the goals and satisfy market demands both in Italy and abroad, in recent years culminated in broadening the existing range of products, penetrating new market sectors and increasing production. For this reason, over the last couple of years, the SYSTEM GROUP factories have undergone substantial modernisation and reorganization, including the update of the production lines.


One of the most important activities inside DERIPLAST GROUP is dredging. For many years DERIPLAST has been actively involved in important dredging projects all over the world, supplying complete floating pipelines to dredging companies, port authorities and dredgers manufacturers.
The quality level of Deriplast Group allows to satisfy the technical requirements of the most powerful dredgers existing today in the market; in fact, Deriplast is among the very few companies in the world technically able to produce HDPE pipes with an external diameter of 1200 mm – 48“ resistant to very high operating pressure. All studies carried out by various international bodies have certified that HDPE is currently the most abrasion resistant material available in the dredging industry.
In addition, the advantages that derive from high pressure resistance, flexibility, lightness, better buoyancy and easier logistics management of the HDPE pipe make it preferable to any other material by the end users.
For these reasons DERIPLAST GROUP develops important collaborations in the dredging industry, both with dredging companies and dredgers manufacturers. Dredging is a very particular activity that takes place in quite different environmental conditions that must be considered while planning and designing a dredging line. A dredging project can be performed inside ports or basins such as dams or lagoons but very often in much more challenging environmental situations such as in open sea, in presence a wind and waves or river projects where the water current strongly influences the dredging pipeline, its composition and resistance to downturn. Together with the specific geographic aspects of the dredging site, two others very important and decisive elements must also be considered:
– working pressure;
– type and quantity of material to be dredged.

These information are important since they are key elements for the calculation of the mechanical resistance and the lifetime of the pipes. The large experience of the DERIPLAST GROUP in this sector and the specific knowledge of the various dredging applications and operational complexities allows our Technical Department to analyze the variables inherent to each specific project and provide the right technical-economic proposal to the end user. Therefore, DERIPLAST GROUP does not make standard pipeline proposals but on the contrary each one is customized based on specific requirements and dredging conditions. Each supply of pipeline is delivered with the technical documentation, tests and certifications related to the raw materials and the various production processes. Furthermore, on specific request, Deriplast can provide technical assistance on dredging site with a team of experts in welding, assembly and organization of the dredging line.


From the beginning of civilisation, people, equipments, commodities and materials have been transported by
water. Since the natural phenomena of siltation and sedimentation threaten the navigational depth of rivers and their deltas, people constantly fight a battle against siltation through Dredging.
Dredging is defined as the underwater removal of soil and its transport from one place to another. Without dredging, ground-breaking projects such as the construction of the Suez Canal, the Panama Canal and Palm Island would not exist. More importantly, dredging is vital to our social and economic development. Much of the infrastructures has a direct link to dredging. There is a growing need for dredging in many applications, both large and small, in either capital or maintenance works. Dredging is everywhere and offers a world of opportunities.

Some of the most common types of dredging projects are: 
• Channel and port maintenance, construction or deepening (capital dredging)
• Coastal protection and beach nourishment
• Land reclamation
• Mining and aggregate dredging
• Offshore works
• Improvement of the environment

Why Polyethylene?

Polyethylene (PE) used for the production of pipes was developed starting from the 1950s through successive generations (from PE32 to PE100) becoming one of the most widely used materials in the world for the construction of underground networks, for the transport of water and gas, thanks to its excellent hydraulic and mechanical performance and lower installation and maintenance costs compared to steel, cast iron, stoneware and cement.
Polyethylene pipes are highly competitive in terms of reducing the losses of the transported fluids, as evidenced by decades of experience. The particular properties of the PE also make it suitable for replacing or rehabilitating of exhausted existing pipelines.


facilitates the transport and movement of the


the use of polyethylene gives the duct a good impact resistance even at low temperatures; the viscoelasticity of the material also entails a considerable reduction in the effect of water hammering and stress induced by the laying activity and the stresses of the ground;

High Lenght

Tubes up to 110 mm in diameter. the bars can be supplied in rolls, up to 13.50 meters, thus reducing the number of joints


The PE can be welded with simple techniques such as welding with thermal elements by contact (head to head) or by electrofusion


It allows to make the joints even outside the excavation and to subsequently lay the pipes adapting them to the layout, reducing installation times and costs

Alternative installations

For the rehabilitation of existing networks, in addition to traditional laying techniques, it is possible to use trenchless techniques that reduce social and environmental discomforts

High absorbing capacity

Due to, for example, settlements, earthquakes or frost

No Corrosion


Friendly coefficient and min, fairing

The PE pipes have characteristics that reduce pressure drops, allowing higher flow rates for the same diameter and eliminating the formation of scale, guaranteeing hydraulic efficiency over time

Useful Life

With a life expectancy of MORE THAN 100 YEARS FOR THE PE100.

according to the procedure of the University of Darmstadt

The details that make our product unique


Execution: Inject-enlogated spigots for butt and electrofusion welding


Execution: inject- for butt welding


For stub ends polyethylene; drilles PN 10 and PN 16 as per EN1092-1


Galvanized steel


EPDM or rubber


High density polyethylene pipes entirely made of PE100 (sigma 80 MPa), with minimum values of MRS (Minimum Required Strength) equal to 10 MPa, for pipelines under pressure, produced by DERIPLAST GROUP, a company in possession of Company Quality certification according to UNI EN ISO 9001 and Environmental according to UNI EN ISO 14001, compliant with the UNI EN 12201-2 standard accompanied by a conformity mark issued by a certification body accredited in the EA field according to the UNI CEI EN ISO / IEC 17065: 2012 standard; black colour with oextruded blue or entirely black stripes; external nominal diameter(DN)………PN….SRD.


High density polyethylene pipes entirely made of PE100 (sigma 80 MPa), with minimum values of MRS (Minimum Required Strength) equal to 10 MPa, for pipelines under pressure, produced by DERIPLAST GROUP, a company in possession of Company Quality certification according to UNI EN ISO 9001 and Environmental according to UNI EN ISO 14001, compliant with the UNI EN 12201-2 standard accompanied by a conformity mark issued by a certification body accredited in the EA field according to the UNI CEI EN ISO / IEC 17065: 2012 standard; black colour with coextruded blue or entirely black stripes; external nominal diameter(DN)……… PN….SRD.


High density polyethylene pipes produced entirely in PE100 RC (Resistant to crack), with minimum MRS (Minimum Required Strength) values of 10 MPa, with high resistance to slow crack propagation (with values of SCG – Slow Crack Growth greater than 8,760 hours), single-layer (black with co- extruded blue or brown stripes or entirely black) or multilayer (blue internal black exterior), for pressurized pipes, produced by DERIPLAST, a company in possession of the Company Quality certification according to UNI EN ISO 9001 and Environmental according to UNI EN ISO 14001, compliant with the UNI EN 12201-2 standard, accompanied by a conformity mark issued by a certification body accredited in the EA field according to the UNI CEI EN ISO / IEC 17065: 2012 standard; suitable for laying without a
bed of sand in accordance with the PAS 1075 Type1 or Type2 and with the DVGW GW323 specifications, in possession of a certification issued by an accredited certification body according to the UNI CEI EN ISO / IEC 17065: 2012 following execution , on pipes extruded from the manufacturer by an accredited laboratory according to EN ISO 17025 (HESSEL Ingenieurtechnik GmbH), PLT (Point Loading Test) tests [> 8,760 hours at 80 ° C, 4 N / mm2, sol. 2% Arkopal N100] and FNCT (Full Notch Creep Test) accelerated [> 8,760 hours at 80 ° C, 4 N / mm2, sol. 2% Arkopal N100], external nominal diameter (DN) … mm PN … SDR.


The polyethylene used for the pipes production has been developed since the 50s through subsequent generations (from PE32 up to PE100), becoming one the most used materials in the world for the construction of underground networks conveying water and gas, thanks to its excellent hydraulic and mechanical performances as well as its installation and maintenance lower costs compared to steel, cast iron, stoneware and cement.

The resistance to the slow growth of frail cracks (Slow Crack Growth), caused by cuts or superficial abrasion triggered by both the asperities of the subsoil and laying operations, as well as due to the effect of local loads
focused on the outer surface of the pipe, resulting in the appearance over time of fragile cracks along the inner wall, it’s a key factor for the long-term reliability of any network. The polyethylene PE100 RC safeguards the long-term functionality of ducts, minimizing the risk of fragile cracks occurrence (the first cause of HDPE pipes breakage), preventing the need for repairing and maintaining interventions over the useful life of the project.

In 2005, the DVGW started a research project for the development of a new standard, which was attended, under the auspices of the German Certification Body DIN, by multinational corporations producing polyethylene, European manufactures of HDPE pipes, general contractors, scientific organizations and testing laboratories.
In 2009 the PAS (Publicly Available Specification) 1075 was released with the purpose of establishing, in addition to the existing regulations, proprieties, requisites and testing procedures for polyethylene pipes to be used in the alternative laying methods.
Prerequisite of the PAS 1075 is that the materials can be labelled “PE 100-RC” only if they comply with the provisions of the PAS 1075 itself and are certified by a third-party accredited certification body.
Quality control and safety level described in the PAS 1075 exceed the provisions of any other valid existing standard.


DERIPLAST GROUP has always respected high quality standards throughout the production cycle. The analytical monitoring of the management system and the strict compliance with the applicable standards have favored the achievement of the most prestigious italian and foreign certifications.

DERIPLAST GROUP srl is a company that work with the following systems:
PRODUCTION QUALITY according to UNI EN ISO 9001/2008
ENVIRONMENTAL QUALITY according to UNI EN ISO 14001:2004




Each dredging project takes place in a marine environment and consequently in most cases the pipeline must be floating.
DERIPLAST GROUP, being a dredging specialist supplies the floaters for each diameter of HDPE pipes, either filled with polyurethane foam or empty depending on the specific requirement but mainly on the diameter of the pipes, the impact of external forces and the required buoyancy, factors that are considered during the project analysis.
DERIPLAST floaters are produced in MDPE by rotational molding system, with a uniform thickness throughout the circumference of the float. The foam injected inside the floats is closed cell polyurethane to prevent from entering of water in case of shell breakage.
In case of needs, the floaters can be produced following the shape and size provided by the customer. In this case it must be discussed the time needed to develop the moulds.
All floaters are supplied with assembling tools and accompanied by the quality certificates related to the external MDPE material and the internal polyurethane foam.
Standard colors are normally yellow or orange.


DERIPLAST GROUP supplies a large variety of rubber hoses, of various dimension and thickness, either for suction and discharge applications that are necessary for:
• Improving the flexibility of the pipeline;
• managing difference ground levels;
• assembling a sinking line;
• connecting the pipeline to the dredger pump;
• suction and discharge operations.

According to each specific application DERIPLAST GROUP supplies adequate and customised types of hoses considering specific working pressure of the pipeline, the type of sediment involved, the requested bending radius and the quantity of materials that need to be pumped. DERIPLAST experience in the dredging sector provides the necessary typology of hoses for any specific project. Deriplast studies and supplies a complete range of suction and discharge hoses, including



Operating temperature: 30 to +90 °C
Permissible aromatic content: Max 30%
Max. permissible H2S content: H2S content up to 60 OC 3000 ppm H2S
Content up to 90 0C W.T.: 1000 ppm
Recommended max. flow velocity: 20 m/s for powder, 15 m/s for grains, 8 m/s for semi-fluid, material (pulp)
Max. available length: Up to 33.5m
Max Diameter: 80-1400mm
Production tolerance: Hose lengths +/- 1 %



The minimum bending radius is related to the construction of the individual hoses Additional external reinforcement or protective cladding can be retrofitted, if required, for specific applications.
For hydraulic transportation of various materials (abrasion layer thickness – 10-50 mm).
For pneumatic transportation of granulated and powdery materials.
For transportation of untreated fresh or salt water.
For transportation of drinking water, using special, certified rubber compounds.
For pressures resistance up to 100 bar (depending on the inner diameter).
For every kind of high-speed transportation (pneumatic or hydraulic).