More and more statutory controls are applied to water abstraction from rivers, streams, lakes and coastal water. To help you stick to these more demanding environmental regulations, Johnson Screens® has developed a range of patented products that are now approved by several governmental agencies, both in Europe and in the Americas.
Johnson’s experienced field sales staff or applications engineers will provide you with the optimum financial and technical solution.
Johnson Vee-Wire® screens have been identified as best available technology by regulatory agencies around the world. In fact, Johnson Screens® is the compliant company approved under Section 316b of the EPA (*) Clean Water Act.
The non-plugging high open area design meets the most demanding flow requirements while the smooth flat surface provides a safe barrier for fish and fish egg protection. Johnson Screen’s designs can maintain a slot velocity of under 0.5 fps / 0.135 m/s or lower. This is critical to creating a non-fish impinging environment and complying with all fish screening regulations.
In the U.S. Johnson Screens are approved by U.S. EPA and National Marine Fisheries Society. In Europe, our intakes are officially approved in France (ACS-Attestation de Conformité Sanitaire), in the UK (DWI-Drinking Water Inspectorate) and are compatible with the “European Water Framework Directive.”
(*) EPA = U.S. Environmental Protection Agency
Intakes for drinking water plants, fish hatcheries, industrial process water, power plant cooling water, desalination plants, and many other applications require careful design consideration in order to responsibly protect the aquatic life at the intake.
Passive Intake Screens equipped with Johnson’s primary filtration Hydroburst™ System (detailed description below) are designed to reduce slot entrance velocity (0.135 m/s or 0.5 f/s). Lower entrance velocity protects surrounding aquatic life and prevents debris clogging. This technology can be implemented wherever high volumes of surface water are required.
Its main advantages are:
Low investment cost - The Intake Screen is directly linked to a backflow tube. The absence of civil engineering considerably reduces the cost and delay of catchment projects.
Low maintenance - Johnson Intake Screen is robust and has no incorporated moving parts. It is designed to prevent clogging, and the materials used are resistant to corrosion and scale.
Respect for the environment - The flow rate through the screen is so low that neither flora nor fauna can be dragged into the apparatus.
Easy cleaning - The Air backwash system is controlled remotely and does not require underwater handling.
No waste management - Waste is dragged by the backwash current.
Optimum adaptability - Each Intake Screen is designed to be adapted to specific site conditions including:
- the type of water (choice of material to obtain optimum resistance to corrosion and biofouling)
- dimensions of the particles to be held back (slot selection, 0.12 in. / 3 mm on average)
- water source features (flow rate, depth, current), and available space (S or T-type intakes)
To restore efficient screen performance Johnson offers its Hydroburst System. This system maintains screen cleanliness by generating a periodic blast of air through the screen assembly. For certain applications, slide rails offer a cleaning alternative by raising the screen to the water’s surface.
This system has four primary components:
- a compressor for recharging the air receiver tank
- a receiver tank which stores the compressed air supplied by the compressor
- an assembly of air-actuated valves and piping, which connects the receiver to the water intake
- a control panel, for manual or automatic operation
The typical backwash procedure cleans each water intake sequentially at regular intervals. If needed, it is possible to clean several water intakes at once.
Surface Transfer Pumps
Desalination and Reverse Osmosis Pumps
We offer 16 unique power frames for reverse osmosis (RO) service. Each designed and tested for optimal performance in the most demanding RO applications for the energy, industrial, chemical, aerospace or municipal industries.
We offer bare pumps and simple pump packages, as well as complex pumping systems.
Progressing Cavity Industrial Pumps
Pump high- and low-viscosity fluids smoothly with a nonpulsating flow to protect the integrity of the pumping fluid.
Our positive displacement pumps are built to last and reliably pump a wide range of fluid viscosities with ease.
Viscous fluids: slurries, abrasives, suspended particles (viscosities up to 100,000 CP) Shear-sensitive fluids: wine, polymers, food products.
These pumps operate at pressures up to 1540 psi (108 bar), flow rates up to 1,690 gpm and temperatures to 300°F (149°C).
With a professional staff of sales, service and engineering personnel standing ready 24 hours a day to support your pumping needs, Johnson provides service after the sale that you can count on. In addition we offer in-field training for our complete industrial PC line.
As a leading manufacturer of progressing cavity pumps, we offer the industry reliable PC pumps and pump parts. Our replacement parts meet published performance standards and are backed by a full Johnson Screens warranty.
Johnson Screens is a single-source outlet for a comprehensive line of industrial PC pumps and parts to fit the following manufacturers’ pumps:
*Moyno and Tarby are registered trademarks of Robbins and Myers, Inc