ISI has been delivering quality and innovative intake screen systems since 1996 which has included completion of more than 300 custom screen design and fabrication projects. Each project includes careful consideration of site conditions and regulatory requirements followed by a design process where ISI, engineering firms, facility owners, and installation contractors work together to develop a custom solution that will work for the long term. Our focus on fish protection and debris management solutions has resulted in constant innovation to address unique challenges. Key ISI design innovations and features considered during the design phase include:

  • Selection of wedge wire screen material (0.5-9.0 mm) with low approach (0.2-0.4 fps; 6.1-12.2 cm/s) and through-screen velocities (0.3-0.8 fps; 9.1-24.4 cm/s) to meet fish protection regulatory criteria
  • Use of mechanical brush cleaning systems to ensure reliable sourcing of water and maintenance of fish protection regulatory criteria even in the most extreme debris loading or biofouling conditions
  • Careful selection of conical, cylindrical, and flat panel screen shapes to best suite site conditions
    • Conical shaped screens are well suited for shallow and varying water depth applications where a conical shape provides the largest screen surface area in extremely shallow water sites and can operate when partially submerged
    • Cylindrical shaped screens maximize screen surface area for shallow and deep water sites and can greatly reduce overall project costs by reducing the size of the facility.
    • Brush-cleaned flat panel screens may be considered in combination with other screen types (e.g., to meet diversion velocity requirements in an in-channel diversion) or as a standalone technology often as an in-kind replacement
  • Use of retrieval systems to provide ease of inspection and maintenance of screen systems
  • Use of anti-fouling coatings and unique brush configurations to maximize cleaning efficacy in the most challenging of freshwater, estuarine, and marine environments
  • Material selection, cathodic protection, and isolation of dissimilar metals to minimize corrosion
  • Use of specific drive types that are best suited to site conditions including selection across hydraulic, electric, turbine and solar powered systems
  • Minimization of head loss and maximization of fish protection and debris management through design of low-velocity systems
  • Incorporation of auxiliary features such as air bubbler systems to reduce surface ice, water jets to move debris, and sediment resuspension rings to maintain site elevations

ISI’s project delivery services include large-scale, design-build projects where we provide complete design, build, install, commissioning, and training services. This experience allows us to optimize designs to reduce total project costs, facility downtime, and minimize regulatory hurdles.

Think of ISI is a technical resource in the screening industry to support your projects.

ISI has designs to address these site challenges:

  • Small Slot Sizes
  • Velocity Uniformity
  • Minimization of Head Loss
  • Large Debris
  • Ice
  • Sediment, Silt, and Gravel
  • Algae
  • Aquatic Vegetation
  • Mussels and Barnacles
  • Hydroids
  • Corrosion
  • Low Water Depth
  • Water Level Fluctuation
  • Maintenance Access
  • Deepwater Offshore Intakes
  • Power Availability
  • Installation Feasibility
  • Minimization of Facility Downtime
  • Sediment Resuspension
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