ATLAS-SSI is the industry's preferred partner for 316(b) project planning, engineering and manufacturing for both new and retrofit applications.

Our Modified Ristroph Fish Handling Traveling Water screens are currently being used around the country in both the Thru Flow design and Dual Flow design. We have demonstrated both in the Lab and in the field that our Fish Handling baskets reflect “Best Technology Available” (BTA). With our unequaled experience in the design and manufacturing of Screens we understand the operational demands that will be placed on the screens and have designed them to address these issues. We have designed our Fish handlings screens by addressing the maintenance issues we have come to understand from our over 30 years in this industry. We offer fine screening and coarse screening options on all style of screens.

We introduced our SmartScreen Technology® primarily to control every aspect of the screen design and operation. This is done by proper selection of screen design and screen components and by maximizing screen life by condition-based operation. This is accomplished by a real time automation system that is based on actual operating conditions of the screen such as differential pressures, screen speeds and seasonal events.

  • Tested and proven marine survival technology
  • Superior debris discharge capabilities
  • Engineered and manufactured to limit maintenance
  • Rugged heavy duty reliability
  • Outstanding factory support
  • American Made In the USA

We can also take your existing screen and upgrade it to “fish ready” or “fish handling”.

  • Fish Ready: We upgrade your screen components to a level that minimizes the upgrades at the time you need to be compliant.
  • Fish Handling: We can return your screen fully fish handling ready to be compliant with 316(b). This option includes modified Ristroph baskets, extended head section and a fish-return system.

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What is 316(b) and why is it so important

The Ins and Outs of Intakes and 316(b) Compliance

In 2014, the EPA issued its “Final Rule” regulating the cooling water intake structures of existing facilities that are designed to withdraw at least two million gallons of raw cooling water per day from the waters of the U.S. Each regulated facility requires an NPDES permit, which is designed to protect biological organisms from impingement (organisms trapped against the front of an intake structure) and entrainment (organisms passing through the cooling system). 316(b) further requires that the modified Ristroph system be optimized following installation. 

Optimization refers both to biological optimization and mechanical optimization. Each cooling water intake structure is unique and the environmental concerns at each facility vary and require individual analysis. Various conditions such as species of fish, water velocities, intake design, pump location and many other factors means there is no off-the-shelf, one-size-fits-all compliance to 316(b). ATLAS-SSI understands that and is equipped to support you through this process.

Picking a Fish-Friendly Water Screen that Will Last with Dan Giza and Ford Wall

Facilities looking to comply with the EPA’s Clean Water Act, especially those who need to comply with Section 316(b), may be in for a bit of a journey.

Since each facility is different, installation of fish-friendly modified traveling water screens must be followed by an investigation period of two years, which can be extended if things aren’t working well.

But it’s not only about passing the test, said Dan Giza, Senior Environmental Scientist at ASA Analysis and Communication. It’s also about making sure things are operating well into the future.

“The long-term things to think about, as well, that most facilities will do when they’re buying a new component for their plant, is these screens are a little different than traditional. Traditional screens may have only operated once a shift or a couple times a shift,” Giza said. “The new requirements for fish-friendly screens are that they operate and rotate continuously or near continuously, so you need to be thinking about the components like wear-and-tear, maintenance and things of that nature.”

While many are focused simply on getting past the testing phase or understanding the biological aspects of the regulations, Atlas-SSI Vice President of Sales Ford Wall said you have to take the mechanical aspect into account.

“The ruling actually doesn’t address mechanical optimization other than to say if a screen’s not running, it’s not optimized, and you’re not compliant if the screen is not running,” Wall said. “You need to take the mechanical side of this very seriously, because the screens are now running 24/7, seven days a week, and they’ve increased their run time by 75-80% at some plants now.”

Fortunately, Atlas-SSI’s modified traveling water screens are built not only to be compliant with the current regulations, but also to last over the long haul.

AUTHOR: Daniel Litwin
CONTRIBUTORS: Dan Giza, Ford Wall