Invisihead Offshore Intake System

Invisihead offshore intake and outfall
The InvisiHead seawater intake velocity cap – a patented omni directional intake head system – adds to the performance of the offshore system. It is fitted to the upstream end of seawater intake system pipelines located some distance into the sea from the shoreline.Entrance velocity is lower than 0.091 m/s (< 0.3 fps). The approach velocity is extremely slowThe InvisiHead entrance section is hydraulically fine-tuned in lab to optimize system hydraulics. The entrance dimensions are not arbitrarily selected but hydraulically calculated in a multi dimensional approach. Each dimension is a function of the steady flow velocity. Eddies through this approach are totally eliminated.The InvisiHead System can be supplied with a built-in anti biofouling dispensing system to be connected with an onshore disinfectant source through HDPE or PVC hose. The system is designed so that 100% of the disinfectant dispensed remains in the water flowing into the intake pipeline and none flows outside of the system.a diagram of the InvisiHead
Invisihead Features

  • Low approach velocity 0.0027 m/s (0.009 fps) max. at 5 meters away
  • Low entrance velocity 0.091 m/s (0.3 fps) max
  • Negligible head loss at 0.17 mm or 0.00017 m
  • Maximizes pumping efficiency
  • One piece or component form for assembly at site
  • Variable flow phases to:
    • Promote head loss reduction that results in:
      • smaller pipelines
      • shallower intake basin
      • less debris inflow
      • the elimination of the need for backwash
    • Further reduce debris inflow
    • Perform self cleansing
  • Stainless steel construction
  • Can be supplied with a built-in anti biofouling chemical dispensing system
  • No screens are used at any stage of the InvisiHead
  • Adaptability for use in industrial effluent outlets and outfalls
  • Can be retrofitted to existing systems
  • Immune to oil spills
  • Low initial cost
  • No operating or maintenance costs involved
  • Less debris present in the cooling water including sand hence lower potential for erosion of heat exchanger tubes and pump vanes
  • Drastic reduction of chemical consumption including chlorine due to the oxidizable material load reduction
  • Drastic reduction of entrained air in the cooling water and less oxygen would be present in the water, hence lower potential for corrosion and lower frequency for air evacuation process
  • Marine life preservation
  • Maintenance costs of the intake system are much lower, no traveling or fixed screens are included, and therefore, no longer deferential pressure activation mechanism is required, no backwash at all
  • Higher cooling efficiency since the water brought in from deep locations is cooler than the beach water
  • Storms have no negative effect on the system
  • The standard outfall channel is replaced by a much more efficient diffusing system that ensures adequate mixing and efficient heat dispersion. The heat plume does not reach the surface and it is confined to the area close to the point source eliminating any adverse effects on the environment.
  • Robust and stable under all weather conditions
  • Especially fit for use in hurricane regions
  • Meets and exceeds world-wide environmental requirements

Additional Information
Invisihead Technical Specifications
InvisiHead Engineering
InvisiHead Flow Management
InvisiHead Seawater Outfall

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