Ocean Star Diving Services

Services

Construction and repairing of jetty's
Sea bed survey
Block placing
Repair & rehabilitation of underwater concrete / hydraulic structures.
Under water cutting & welding
Under water cutting & removal of piles
Laying of underwater cable and pipes.
Erection of underwater structures.
Dredging and de-silting
Under water visual inspection, Under water videography, Under water still photography
Inspection of pipe lines and cable laying.
Non destructive testing of all under water marine structures.
Data processing & preparation of reports

Tethered diver and ROV penetrations of up to deeper depths.
Installation and pressure testing of internal mechanical seals for joint leak repairs.
Pipeline and outfall retrofit of diffuser ports, manhole trunks and "hot taps" for branch pipe installation and extensions, repair and/or replacement of damaged pipe sections.
Removal of internal sedimentation, debris buildup and other blockages using hand dredging, pipe "pigging" techniques, and/or mucking of larger objects using divers.
Installation and repair of submarine cables and RCP, HDPE, welded steel, and ductile iron pipelines in rivers, bays, exposed coastal and open water environments.
Structural repair and concrete restoration of lined and unlined tunnels using epoxy injection, underwater forming, concrete line-pumping or tremie placement methods.
Installation of reference electrodes or sacrificial anodes with mechanical attachment at external joints or "wet-welding" externally or internally .
Anchoring of existing pipelines to sea bed, placement of concrete filled mats for armor protection and ballast, remedy unsupported pipeline spans .

Installation and pumping of large mattresses to seal and cover damaged, broken and leaking concrete canal lining.
Structural repairs to concrete gate vaults, pipelines, concrete sheet piling, bulkheads and lined tunnels and basins using two-part epoxy injection techniques and materials.
Leak repairs in large basins using urethane injection techniques
Repair of voids, cracks and spalls in concrete resulting from river scour, subsidence, mechanical damage, failed concrete and structural rebar corrosion on dam faces, intake/outlet structures, sea walls and other submarine structures.
Wood, steel and concrete piling and other structural repairs using tubular or nylon bag forms for concrete encapsulation under piers, wharves, bridges and dams .
Wood, steel and concrete piling and other structural repairs using tubular or nylon bag forms for concrete encapsulation under piers, wharves, bridges and dams .

Intake structure rehabilitation including slide gate, track and seal, and manual operator and support guide repair/replacement on dams, canals and storage basins.
Repairs, modification to and replacement of trash-rack and debris screen structures.
Abandonment of pipelines, manhole structures, temporary and permanent plugging of pipelines and tunnels .
Submersible pump maintenance, repair, removal and replacement .
Repair and maintenance to mechanical supports on sanitary outfall pipelines, water intake and discharge lines.
Submarine valve and hydraulic control system plumbing repairs and replacement .
Industrial and sanitary treatment plant maintenance and repair of mechanical structures in process tanks, basins, ponds, vaults and pipelines.
Repair and modifications to diffuser ports, aeration systems, and discharge pipelines.
Repair and modifications to diffuser ports, aeration systems, and discharge pipelines.
Repair and modifications to diffuser ports, aeration systems, and discharge pipelines.

Structural repairs to sheet piles barriers and cellular cofferdam structures, bonding strap reinforcement repairs.
Ship husbandry, maintenance and repairs including repair of side and bottom shell damage, AWS D3.6 coded "wet-welding" for patch installation, sacrificial anode installation, propeller trimming, installation/removal of rope guards and cable removal from prop- eller and shaft .
Underwater dry habitat weld repairs for pipelines and other structural steel and support platform members; wet-weld repairs to screens and gates, sacrificial anode installations and continuity welds for impressed current protection for pipelines.
Steel sheet and support pile oxy-arc cutting and removal, demolition and removal of steel rail track and structural steel debris.
Steel sheet and support pile oxy-arc cutting and removal, demolition and removal of steel rail track and structural steel debris.
Concrete demolition and removal using impact hammers and breakers, core drilling, roto-impact and rock drilling, hydraulic concrete splitters, diamond wire and circular saw cutting, and underwater explosives .

Pipeline cleaning and sediment removal using "sewer ball"pigging, directional jetting and suction, and pressure pump backwater / reverse nozzle flushing techniques.
Airlifting and water-lift educators for removal of biofouling debris accumulation, excavation of mud, clay and sandy bottoms to expose pipelines, cables, and structures.
High pressure water blasting for epoxy coating removal, biofouling and corrosion or scale removal, and structural/substrate preparation of weak or damaged concrete for encasement and sealing repair.
Pipeline and cable burial or exposure for protection or exposure to perform repairs.
Debris removal for retrofit and repair to bridge piers, footings and foundations.
Sediment removal in and around intakes on dams, siphons, pump stations and low level basins, marinas and boat ramps, adjacent to sheet pile cofferdams during shoreline and/or stream bed restoration, and for any marine construction.