Elmosa - Seawater Intake and Marine Outfall Systems Seawater intake systems and outfalls, seawater intake velocity cap, American Eco Systems Corp.
Environmentally Responsible Proactive Non-Reactive Selective Seawater Intake & Outfall Systems


Elmosa, USA

Scour proofing
Flow Hydraulics Compariso
Offshore Platform/Pump Strainer

Offshore Platform on Floor
Platform Outfall

Elmosa Complete System


Elmosa Complete Outfall

Outfall Flow Mngmnt

NatSep Sediment Separation

Anti biofouling chemical dispensing system
We also include anti biofouling injection system in the InvisiHead


ASE Contact



                        The only water intake system that pays its capital costs and makes money; $0 paid for O&M

Potential Users: Power and Desalination Plants, Petrochemical and Gas Complexes, Refineries, Aquaculture and Fish Farms, Municipal Systems. This virtually unlimited flow capacity velocity cap holistically protects aquatic life; no impingement or mortality; It is unattractive to aquatic organisms, sediments or debris, it is a selective system. As an outfall it safely discharges, disperses and dilutes RO brine, cooling water, and wastewater blending and disappearing into the ambient within the vicinity of the outfall in full compliance with US EPA standards. No ecological impacts. It is a best technology available as designated by the EPA

The genuine and original Site-Specific Selective InvisiHead and NatSep technologies reside here at American Eco Systems Corp

Starting January 2013 the InvisiHead
flow transition through the sequential 4 flow phases have improved to further imrove water quality and reduce flow of sediment  if present in the water column; velocities: approach 0.002 m/s (0.0066 fps), inlet: 0.09 m/s (0.295 fps), outlet: 0.15 m/s (0.49 fps); no environmental adverse impacts associated with seawater intake or concentrate discharge; low on SDI, ideal for RO systems

The InvisiHead makes money
Operation-free. Maintenance-free intake system  Payback period in the form of O&M cost savings is short; savings in capital and O&M expenses are high


Turn on the seawater pumps at the pump house and relax. No more alarms. No more pressure drop to worry about. No more clogging. No more backwash or air bursting. No more dead fish or any of the aquatic life. No more marine growth or sediments settling in the intake pipe. Simply, no more operation or maintenance. All remain in DAY 1 condition for decades to pass.

Seawater Intake & marine outfall System - the philosophy behind the design: let nature manage system operation

Milestone dates: 1981/1982 the InvisiHead was conceived, researched and developed at the reputed St. Anthony Falls Hydraulic Lab of the University of Minnesota; 2002 US EPA designated the InvisiHead as a BTA; 2009 Australian Ministry of Environment and Australian EPA approved the InvisiHead outfall to be installed in Australian waters; 2009 an Australian mining company selected the InvisiHead for their RO plant intake and brine discharge; in 2010 a British consulting group selected the InvisiHead to serve Sydney's Next Generation 1 million m3/d RO desalination plant to supply 2.4 million of seawater and discharge 1 million m3/d; 2013 water enters InvisiHead at 0.09m/s and leaves it at 0.15m/s, marine currents flush out any sediments and marine life if found.

The American Eco Systems introduces the Elmosa offshore seawater intake and marine outfall systems - the InvisiHead. InvisiHead flow streamlining is improved in 2012 for better performance. It's specially fit for RO systems due to its high reduction of suspended matter resulting in a lower SDI
Supported IH
Click here to enlarge

We are seawater intake system consultants as well as InvisiHead designers and fabricators. The InvisiHead is selective it lets water and leaves sediments and marine life behind. It is a robust stable structure built to remain in full operation during stormy conditions. It is designed to withstand SS Cat 5 hurricanes.


In 2012 AES updated and enhanced the flow streamlining of the InvisiHead Intake and outfall systems and improved the hydraulic tuning of the flow streamlines within the approach and Entrance phases in order to increase the degree of exclusion of marine life, sediment and debris. The change in flow pattern created by this velocity cap triggers an avoidance response mechanism in fish, thereby avoiding inflow. The structural integrity of the InvisiHead has been also reinforced to stand up to G5 hurricane force. The IH systems are made of high grade thick stainless steel plates to preserve structural integrity of the systems and remain in full operation during the structure's lifetime of over 50 years. At American Eco Systems Corporation time freezes.

AES complete intake sys
Click here to enlarge


Click image to elarge

For the proper design of the seawater intake and outfall, the InvisiHead system has been developed to be the system of choice that naturally handles the flows in both directions. The InvisiHead seawater intake head is selected by the US Environmental Protection Agency consultants as the best technology available (BTA or BAT) in 2002. The designation is still valid. The InvisiHead intake and outfall systems are in full compliance with the requirements of Section 316(b) of the US EPA Clean Water Act. Both systems meet and exceed the requirements by 40%. The Act requires an intake entrance velocity not to exceed 0.15 m/s. The InvisiHead's is 0.09 m/s. The InvisiHead supports biodiversity, protects and preserves the ecosystem.  it is environmental in both directions: water withdrawal and discharge. American Eco Systems takes environmental protection and preservation seriously and as a top priority that is integrated into system design and operation.

The InvisiHead system works as a superb marine outfall. The dispersion process of effluents is unmatched by any other technology including the widely-used linear riser - diffuser systems. Dilution occurs within a short distance from the radial pointsource. AES has secured the outfall design to remain in compliance for many decades to come. Both the Australian Ministry of Environment  and EPA favored The InvisiHead intake and outfall over the existing types to be installed in Australian offshore waters.

Flow velocities into the InvisiHead intake head and out of the InvisiHead outfall:

  • 0.002 m/s max. (0.006 fps) <5 meters (15 ft) away from entrance, approaching or dispersing,
  • 0.03 m/s max. (0.1 fps) 1.0 meter (3 ft) away from entrance, approaching or dispersing,
  • 0.09 m/s max. (0.3 fps) at circumference, entering or releasing,
  • 0.15 m/s max. (0.5 fps) at InvisiHead intake outlet. 
Head loss at the InvisiHead approaches zero. It is engineered to control and drastically reduce the inflow of debris, the ingress of fish, and the impingement of mussels and other marine life and entrained air.
InvisiHead comparison with wedge-wire screen intake heads

InvisiHead system for use as pump strainers, intakes, or discharge marine outfalls in offshore uses and in oil and gas platforms

The InvisiHead operating as a seawater intake or a pump strainer
IH strainerInv.
System fixed to platform, see details
IH strainer
System fixed to the sea floor serving the platform, sea details

The InvisiHead operating as a marine outfall
outfall inv.
System fixed to platform, sea details
System fixed to the sea floor serving the platform, sea details


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