Marine Construction

Sea Engineering has been a licensed general contractor in Hawai'i since 1986. The construction division of the company specializes in marine and underwater construction and concrete rehabilitation, and provides subcontractor diving services to general contractors for underwater work on large projects. SEI has completed projects in Hawai'i, California, Alaska and Japan.

Concrete Repair and Restoration

• Structural repairs using two-part epoxy injection techniques and localized quick-setting concrete patch repair.
• Repair of broken and leaking concrete canal lining by installation and pumping of large mattresses to seal and cover damage.
• Repair of voids, cracks and spalls in concrete, subsidence, mechanical damage, failed concrete and structural rebar corrosion on sea walls, bulkheads and other submarine structures
• Concrete encapsulation of piles under piers, wharves, and bridges using tubular steel or nylon bag forms.

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Submarine Cable and Pipelines

• Installation and pressure testing of flexible fuel hose for offshore tanker depot
• Removal of sedimentation buildup, sand deposits and other blockages using hand dredging, pneumatic/hydro blasters using divers
• Submarine fuel pipeline ultrasonic inspections
• Installation and repair of submarine cables, HDPE, welded steel, and ductile iron pipelines in lakes, bays and exposed coastal environments
• Anchoring of new and existing pipelines to sea bed, placement grout bags for armor protection and ballast
• Installation of mid-water supports for long HDPE pipe spans on 48” pipe.
• Pipeline cleaning using high-pressure “Pigging” techniques.

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Structural Repair and Demolition

• Dry-dock structure rehabilitation including slide gate, track and seal, manual operator and support guide repair/replacement
• Repairs, modification to and replacement of trash-rack and debris screen structures
• Temporary and permanent plugging of abandoned pipelines, tunnels and manhole structures.
• Repair and maintenance of mechanical supports on pipelines, outfalls and intake/discharge lines.
• Repair of mechanical structures in industrial and sanitary treatment plant process tanks, basins, ponds, vaults and pipelines.
• Repair and modifications to diffuser ports, aeration systems, and discharge pipelines.
• Design, repair and construction of boat ramps, floating docks and walkways, water access platforms and steps
• Maintenance and repairs to the underbody of ships including anode installation, propeller replacement and shaft seal repairs, removal of biofouling prior to dry-docking, cofferdam and plug installation for overboard discharge and intake valve service and replacement
• Installation of anti-scour mat around exposed or unsupported pipeline spans for protection of bridge piers, footings, and other submarine structures
• Scour and erosion control of bridge piers and sea walls with anchored submarine placement of concrete-filled mattresses.

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Dredging, Debris Removal & Excavation

• Airlifting and water-lift eductors for removal 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
• Structural/substrate preparation of weak or damaged concrete for encasement and sealing repair
• Burial or exposure of pipeline and cable for protection or exposure to perform repairs
• Debris removal for retrofit and repair to bridge piers, footings and foundations
• Floating debris and sediment booms for containment purposes on marine construction projects, run-off control and emergency spills.

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