If the content is not available in your preferred language, please contact us by e-mail.
Johnson Passive Intake Screens
Johnson
Screens® have been developing passive screens since 1968. In the meantime, more
than 4,000 passive intakes have been installed worldwide. This type of screen
is particularly interesting for flow rates of up to 100,000 m³/day or more,
depending on costs for submerged constructions.
Unique Selling Point
- Johnson Screens® developed the first Passive Intake Screens in 1968
- More than 4,000 passive intakes have been installed worldwide
- Particularly interesting for flow-rates up to 100,000 m3/day or more depending on costs for submerged constructions
- Most even through-slot velocities and lowest entrainment risk
- High flow capacity and adaption to your project
- Easy to install
- Low pressure loss
Insights
Johnson Screens high capacity passive intake screens are constructed using non-plugging Vee-Wire® with a patented internal flow modifier that creates a nearly uniform low velocity flow through the entire screen surface. This reduces impingement and entrainment of debris while protecting aquatic life. Passive intake screen systems have no moving parts that could break down or wear out, unlike travelling screens. This eliminates the need for replacement parts and costly repairs.
The controlled slot velocity of the screen, coupled with the specially matched Hydroburst™ air backwash system, keeps the system clean and operating. This combination (passive screens and the Hydroburst™) is commonly known as JOIS™ (Johnson Offshore Intake Systems)
Passive screens are typically designed to meet regulatory requirements for a maximum slot velocity of 0.15 m/s (0.49 ft./s) which is the maximum velocity at which a juvenile fish can turn around, swim away and not be impinged onto a passive screen. This, combined with a typical slot width range of 1 to 10 mm (0.04 to 0.4 in.) (3 mm (0.12 in.) is the most common) will determine the screen sizing. The large open area and low velocities result in a very low headloss.
The Hydroburst™ system is designed to deliver a certain/adequate volume of air in 3 – 5 seconds time – a solid blast of air that has proven to work in all types of applications and conditions. This volume of air comes out from the bottom of the screen, and as it rises and expands, grabs and carries away impinged debris from the screen surface, returning the screen to a clean operating condition. Our application engineers evaluate screen size, depth and distance away to deliver the correct amount of air. Systems can be as basic as operating a manual valve, a programmable timer system or to a PLC system that communicates to a central data control system/SCADA system for control.
Locations and Contact
Asia
Aqseptence Group Japan Limited, Yokohama
Sales Location
Daiwa Jisho Bldg. 74-1,
Yamashita-Cho Naka-Ku, Yokohama
231-0023 Kanagawa
Japan
Tel: +81 45 661 3575
Fax: +81 45 661 1921
info.johnsonscreens.jp@aqseptence.comAsia
Aqseptence Group Co. Ltd., Hangzhou
Sales and Manufacturing Location
8 Chengye Road,
Binjiang District Hangzhou
Zhejiang Province, 310053
China
Tel: +86 0571 86698098
Fax: +86 0571 86698066
info.cn@aqseptence.comAsia
Aqseptence Group (India) Private Limited, Ahmedabad
Sales and Manufacturing Location
E-540, GIDC, Sanand-II Industrial Estate,
Village: Bol, Tak: Sanand,
Gujarat 382170, Ahmedabad
India
Tel: +91 2717 618000
info.johnsonscreens.in@aqseptence.comEurope
Aqseptence Group SAS, Availles-en-Chatellerault
Sales and Manufacturing Location
Zone Industrielle
86530 Availles-en-Châtellerault
France
Tel: +33 5 4902 1600
Fax: +33 5 4902 1616
info.johnsonscreens.fr@aqseptence.comEurope
Aqseptence Group GmbH, Karlsruhe
Sales and Manufacturing Location
Hardeckstrasse 3
76185 Karlsruhe
Germany
Tel: +49 721 5001 0
Fax: +49 721 5001 213
info.geiger@aqseptence.comNorth America
Aqseptence Group, Inc., New Brighton, MN
Sales and Manufacturing Location
1950 Old Hwy 8 NW,
New Brighton, MN 55112
USA
Tel: +1 651 636 3900
Fax: +1 651 638 3171
info.johnsonscreens.us@aqseptence.comOceania
Aqseptence Group Pty Ltd., Brisbane
Sales and Manufacturing Location
88 Brickyard Road,
Geebung 4034 QLD
PO Box 85, Virginia DC,
QLD 4014
Australia
Tel: +61 7 3867 5555
Fax: +61 7 3867 5566
info.johnsonscreens.au@aqseptence.comSouth America
Aqseptence Group S.A., Santiago
Sales and Manufacturing Location
Av. El Roble 315
9390381 Lampa, Santiago
Chile
Tel: +56 02 9280700
Fax: +56 02 9280705
info.johnsonscreens.cl@aqseptence.com
Choose your regional contact for a product inquiry.
A sales representative will respond to you shortly via telephone or email.
Product inquiries for countries of installation outside of the locations listed below, please contact us via email. info.geiger@aqseptence.com
Aqseptence Group Japan Limited, Yokohama
Sales Location
Daiwa Jisho Bldg. 74-1,
Yamashita-Cho Naka-Ku, Yokohama
231-0023 Kanagawa
Japan
Tel: +81 45 661 3575
Fax: +81 45 661 1921
info.johnsonscreens.jp@aqseptence.comAqseptence Group Co. Ltd., Hangzhou
Sales and Manufacturing Location
8 Chengye Road,
Binjiang District Hangzhou
Zhejiang Province, 310053
China
Tel: +86 0571 86698098
Fax: +86 0571 86698066
info.cn@aqseptence.comAqseptence Group (India) Private Limited, Ahmedabad
Sales and Manufacturing Location
E-540, GIDC, Sanand-II Industrial Estate,
Village: Bol, Tak: Sanand,
Gujarat 382170, Ahmedabad
India
Tel: +91 2717 618000
info.johnsonscreens.in@aqseptence.comAqseptence Group SAS, Availles-en-Chatellerault
Sales and Manufacturing Location
Zone Industrielle
86530 Availles-en-Châtellerault
France
Tel: +33 5 4902 1600
Fax: +33 5 4902 1616
info.johnsonscreens.fr@aqseptence.comAqseptence Group GmbH, Karlsruhe
Sales and Manufacturing Location
Hardeckstrasse 3
76185 Karlsruhe
Germany
Tel: +49 721 5001 0
Fax: +49 721 5001 213
info.geiger@aqseptence.comAqseptence Group, Inc., New Brighton, MN
Sales and Manufacturing Location
1950 Old Hwy 8 NW,
New Brighton, MN 55112
USA
Tel: +1 651 636 3900
Fax: +1 651 638 3171
info.johnsonscreens.us@aqseptence.comAqseptence Group Pty Ltd., Brisbane
Sales and Manufacturing Location
88 Brickyard Road,
Geebung 4034 QLD
PO Box 85, Virginia DC,
QLD 4014
Australia
Tel: +61 7 3867 5555
Fax: +61 7 3867 5566
info.johnsonscreens.au@aqseptence.comAqseptence Group S.A., Santiago
Sales and Manufacturing Location
Av. El Roble 315
9390381 Lampa, Santiago
Chile
Tel: +56 02 9280700
Fax: +56 02 9280705
info.johnsonscreens.cl@aqseptence.com