Fitzsimmons Creek Coanda Effect Screen

Fitzsimmons Creek Coanda Effect Screen
Power Generation
Obtaining environmentally friendly,
maintenance-free intake screens to generate
green energy for the 2010 Winter Olympics.
Cook Legacy, collaborating with Norris
Screen™, designed and built Coanda Effect
Providing the power supply at the 2010
Winter Olympics in Whistler, British
When the need arose to provide green energy on Fitzsimmons Creek in British Columbia,
Cook Legacy and Norris Screen partnered to design and build ten Coanda Effect screens.
The screens' unique slanted wedge wire construction allows layers of river water to be
“sliced off” while flowing over the screen. The water falls through the screen and is
diverted to a turbine and power station. The remaining water flows downstream with any
debris, minimizing maintenance. Additionally, the smooth screens are “fish-friendly” —
further reducing the footprint of this run-of-river hydro project.
Municipal Water
Update and retrofit of Municipal Water
Plant to increase site capacity. The
system piping and wet well were too
small for the upgrade, leaving a very
low tolerance for clogging on the
Cook Legacy developed a custom air
burst system to clean the screen. In
order to ensure that the system had full
capacity the air burst system was set to
provide a burst of air based upon a
timer, a push button, or a signal from
the system SCADA indicating a drop in
the wet well level.
System is operable without structural
modifications to the wet well.
Air Burst System for Municipal Water
Air Burst System for Municipal Water
A water treatment plant was updating its capacity. One major component of this upgrade was
doubling the intake capacity of the systems. Although the screens were properly sized to account
for the upgrade (they were developed by Lee Cook in 1997) the physical system including the
wet well was not. As such there was no room for clogging or loss of capacity within the system.
Cook Legacy developed an airburst system which integrated with the plant’s SCADA system to
provide a cleaning burst whenever water level dropped. The system was also flexible, and
allowed for timer initiation, or initiation via an onboard touch screen.
Power Generation
Power plant cooling water intake
system had to be modified for better
performance, to halt zebra mussel
attachment and to comply with EPA
Passive screen system was designed
and sited with the right dimensions and
location to minimize adverse
environmental impact. Screen was
coated with Jacquelyn™ Corrosion and
Zebra Mussel Resistant Coating.
Improved water quality at intake.
System was permitted with the
appropriate screens and is now in
successful operation. Cook Legacy
modifications to screen saved 25%
over standard wedgewire intake
Custom Cooling Water Intake System
Cooling Water Intake Systems
Cook Legacy Intake Screens are effective for cooling water systems for power plants and other
facilites. Cook Legacy developed the Cooling Water Intake Screens for a power generating
facility in Wisconsin. The site included several challenges, including environmental concerns,
zebra mussel infestation, damage to the existing pipe, and the system was going to be placed in a
high traffic area. Cook Legacy used flow modification to define the velocity profile of the screen
and avoid environmental damage. The zebra mussel problem was addressed with patented
Jacquelyn™ Coating. Cook Legacy developed a screen geometry that allowed it to be easily
installed within the existing system while maintaining a low profile to avoid boat traffic.
Power Generation
A new intake system was being built in
an area infested with zebra mussels.
The system had no tolerance for
diminished flow so they had to ensure
that the intake pipes remained free of
zebra mussels.
The ID of the piping was coated with
Jacquelyn™ Coating. This was
significantly less expensive than using
pipe built of an antifouling material.
Reduction of capital, operating, and
maintenance cost for the facility.
Jacquelyn Coated Pipe
Jacquelyn™ Coated Intake Pipe
A power plant was retrofitting its cooling water intake system to comply with EPA Regulation
316(b). The engineers were concerned because the water body they were drawing from was
infested with zebra mussels. In addition, the flow rate through the system was going to be
decreased to a flow rate which is optimal for zebra mussel growth. The facility needed to
maintain ample cooling water to avoid costly thermal discharge penalties or even a system
outage. Cook Legacy used Jacquelyn™ Coating to address these concerns. Using our ASME
Certified fabricators we built the pipe and applied Jacquelyn™ Coating to the ID of the intake
pipe array. This application led to a significant reduction in capital cost over the use of exotic
material such as 90-10 CuNi for the piping.
Cooling water
An island resort had a large water
intake system for cooling water and as
backup for a fire control system. These
functions were essential but the water
was full of all forms of aquatic life,
including biofouling. The system had to
be rapidly removable so that it was not
destroyed during the annual hurricane
As one component of a custom
designed intake solution, Cook Legacy
used Jacquelyn™ Coating on
wedgewire panels to exclude aquatic
life while eliminating biofouling.
The system eliminated biofouling on
the screens and was easy to install and
Retrofit of an Intake Screen for Antifouling Performance
Antifouling Intake Screens
Warm, clear, water and a constant summer are a perfect scenario for a lovely vacation
destination. They also create significant design challenges such as aggressive
biofouling. Cook Legacy worked with a resort owner at an island resort to retrofit his
existing intake system (an offshore strainer) with a new passive screen system.
Cook Legacy worked with the site owner to develop a custom flow modifier within the
system to ensure consistent flow, and to make the screens so they could be easily
installed and removed. To address biofouling concerns Cook Legacy coated the
screens with Jacquelyn™ Coating.
High maintenance and debris handling
costs, long outages, frequent
replacement of vertical traveling
Retrofit to passive screen system with
wedgewire screens. System was
mounted on a bulkhead to slide into
existing traveling screen canal.
Improved water quality at intake.
Reduction of operating and
maintenance cost. Eliminate need for
outages every 5-7 years.
Retrofit of Vertical Traveling Screens
Retrofit of Vertical Traveling Screens
There is often a significant value of retrofitting vertical traveling screens with Cook Legacy type
screens. In one instance, three chemical processing locations retrofit their vertical traveling
screens. The vertical traveling screens at these locations required significant annual maintenance
and rework. Every 5 – 7 years the vertical traveling screen machines had to be totally replaced.
Working with the facilities engineers and consultants, Lee Cook designed the screens and
bulkheads to drop into the concrete slots for the vertical traveling screen machines. The vertical
traveling screens were pulled and replaced with the new passive intake screens. The process of
retrofit of the screens was dramatically faster than previous experience in the removal and reinstalling the vertical traveling screens. Operating and maintenance requirements of the intake
system have been eliminated. This includes power to run the screens, consumables, screen
maintenance, and debris handling requirements. The need for replacement every 5-7 years has
been eliminated. In addition, the reduction in time related to the retrofit allowed the facilities to
come back to full production days earlier than they had with the vertical traveling screens.
Engineers for the facilities report that because of the increased productivity and shortened time
out of service the payback period for the retrofit was instantaneous.
High maintenance and debris handling
costs, poor water quality
Retrofit to passive screen system with
wedgewire screens
Improved water quality at intake.
Reduction of operating and
maintenance cost. Project payback of
2 years.
Retrofit of Offshore Intake and Inline Strainer
Reduced Cost and Improved Performance by Passive Screening
A chemical plant replaced their existing intake structure –offshore intakes with 1/2" diameter
screen openings -- with Cook Legacy type screens. The old intake structures had required
significant maintenance and created periodic outages. In addition, there was considerable debris
in the intake water that had to be removed with an in line strainer system.
The in line strainer systems were expensive to operate and created significant maintenance
burdens. The new intake systems included Cook Legacy type screens with openings that
excluded the debris that was otherwise gathered and processed through the in line strainer
system. The retrofit screens have eliminated the periodic outages and the need for screen
maintenance. In addition, the use of the screens has made it possible to take the in line strainer
out of the flow loop saving the cost of operating and maintaining the equipment. Costs
associated with the collection, processing, transportation, and disposal of debris has been
eliminated. Water quality delivered to the process stream has improved. Engineers for the
facility calculated payback for the retrofit to be less than 24 months.
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