DECo Subsea Offshore

Contact & Details:

Address	Peraltastraat 5
City	Bruges
ZIP Code	8000
Country	Belgium
Phone	+32 50 31 10 92
Email	info@deco-subsea.be
Website	www.deco-subsea.be
Description	Subsea pile cutting operations are commonly performed during installation and/or decommissioning works for offshore oil & gas and offshore wind structures (jackets and monopiles). For a variety of reasons, internal pile cutting is usually the preferred option. All our internal cutting tools make use of DECO Subsea's patented ultra-high pressure abrasive water jet subsea cutting technology which is the result of more than two decades of research and development. Today, DECO Subsea sets the industrial benchmark in this technology with class leading cutting power, unparalleled cutting speed and exceptional reliability. Our cutting power easily allows us to cut with a single pass through 230mm high tensile steel, 450mm cast iron, 1200mm reinforced concrete and 36" 4-string conductors. Our track record shows more than 1400 piles cut at waterdepths up to 130m below LAT. Our portfolio of existing internal cutting tools allows us to cut any pile with internal diameter between 550mm and 3000mm. In view of future requirements, we have designs ready for fabrication of internal cutting tools for pile diameters up to 10m. For maximum efficiency, all our internal cutting tools can be combined with a pile clamp arrangement which allows to cut and lift the cut pile section in a single crane operation. External (pile) cutting DECO Subsea designs, develops and implements external (pile) cutting solutions according to the client's needs. Depending on the requirements, our external cutting solutions are based on UHP abrasive water jet cutting or diamond wire cutting technology. For external cutting applications, our UHP abrasive water jet cutting heads are mounted either on custom-made robotic frames or on chariots driving on a chain belt installed on the structure. Diamond wire cutting frames make use of a continuous loop of diamond wire mounted on a series of pulleys (one or more hydraulically driven). A large open span of wire between two of the pulleys performs the cutting as it comes into contact with the target material and continues to feed through until the cut is complete. Our diamond wire cutting frames are designed, assembled and tested in-house, built with corrosion resistant materials and are rated for specific pressures and depths to cut submerged pipes, casings and other structures of varying materials and thicknesses. All our cutting frames and systems are adaptable for work on quay walls, piles, topsides and other structures both above the water surface and below. Most are available with various remote control and automation options that make them suitable for topside control, shallow water diver control or ROV control. Conductor cutting Abandonment is the final stage of every well. Conductor and casing removal is an integral and critical component of any well P&A project. With DECO Subsea's (in-house designed) tested and proven conductor cutting tool, multi-string conductors can be cut efficiently and safely. Our conductor cutting tool makes use of the same patented ultra-high pressure abrasive water jet subsea cutting technology as all our other tools thereby providing class leading cutting power, unparalleled cutting speed and exceptional reliability. Our cutting power easily allows us to cut with a single pass through 230mm high tensile steel, 450mm cast iron, 1200mm reinforced concrete and 36" 4-string conductors. Our track record shows more than 1400 piles cut at waterdepths up to 130m below LAT. Hole cutting DECO Subsea designs, builds and operates a wide range of hole cutting tools based on it's patented ultra-high pressure abrasive water jet subsea cutting technology. The standard range of hole cutting tools can be used to cut circular holes, elliptical holes or X-Y windows (i.e. square or rectangular holes) but in principle any shape is possible. To date DECO Subsea has cut over 850 holes for applications ranging from water replenishment, drainage and cable entry holes to shackle and trunnion holes. Depending on the application, these holes were cut during installation, operation or decommissioning phase of offshore windfarms, oil & gas structures and ship wreck removal. For non-cohesive material dredging, DECO Subsea uses jet-assisted air lift systems or its DOP 1815 submersible hydraulic dredge pump. These tools provide excellent production rates in loose sandy or gravelly soils, but are unable to deal with more challenging soil conditions such as clay, grout or rock. For improved performance in specific circumstances, the simple airlift system may be equipped with waterjets. For a specific application for the Belgian Navy, we have combined various tools into a micro-cutter suction dredge. Clay/grout/rock dredging For difficult soil types, DECO Subsea designs, builds and operates a range of heavy duty pile dredging tools based on high pressure waterjet technology combined with traditional dredging techniques. To date DECO Subsea has successfully dredged over 750 piles in all soil types including London clay, 116 MPa limestone, 135 MPa grout and 184 MPa granite. (external) cleaning When installing wind turbines on monopile foundations, it is not uncommon that there is a period of several weeks (or months) between monopile driving and installation of the transition piece. During this period, biological fouling develops on the surface of the monopile walls. Surface cleanliness of the outer monopile walls is critical for effective grouting of the transition piece. Therefore, any marine growth needs to be removed prior to installation and grouting of the transition piece. DECO Subsea designs, builds and operates outrunner-type robotic cleaning tools equipped with rotating high pressure water jets for swift and effective monopile cleaning. Cleaning with divers Can be mechanical (brushes,…) or hydraulic (using high pressure guns) Quay wall cleaning Vessel cleaning Hull cleaning Jacket foundation pile cleaning Jacket structure cleaning Offshore diving DECO Subsea is fully equipped for professional offshore diving operations. We owns several high-tech containerized dive spreads, fully certified to effectively deal with limited deck space while complying with QHSE regulations. We have teams on 24/7 stand-by. M/V Anaïs is a catamaran-type dive support vessel with a diver decompression chamber and offshore dive unit. The vessel complies with Lloyds and IMCA guidelines. Anais operates primarily in wind farms, on government contracts and assisting Main Contractors. Anais serve as a multifunctional work boat, can also be used for crew charters and ROV inspections and also doubles as dedicatedsurvey vessel. Inshore diving DECO Subsea has 6 mobile dive spreads and a motivated team of professional divers at its disposal for planned and/or rapid (emergency) interventions. The dive spreads are integrated in trucks and carry all the equipment required for marine civil operations (including cutting and welding works). A versatile range of certified diving equipment is available for operations in clean water and/or contaminated/hazardous environments. Inshore diving operations are carried out for a wide range of applications including (hull) inspections, (propeller) maintenance, repair services, obstacle removal, salvage operations, underwater installation activities, tank cleaning, etc