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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


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


Aqseptence Group Japan Limited, Yokohama

Sales Location
Daiwa Jisho Bldg. 74-1,
Yamashita-Cho Naka-Ku, Yokohama
231-0023 Kanagawa

Tel: +81 45 661 3575

Fax: +81 45 661 1921



Aqseptence Group Co. Ltd., Hangzhou

Sales and Manufacturing Location
8 Chengye Road,
Binjiang District Hangzhou
Zhejiang Province, 310053

Tel: +86 0571 86698098

Fax: +86 0571 86698066



Aqseptence Group (India) Private Limited, Ahmedabad

Sales and Manufacturing Location
E-540, GIDC, Sanand-II Industrial Estate,
Village: Bol, Tak: Sanand,
Gujarat 382170, Ahmedabad

Tel: +91 2717 618000



Aqseptence Group Pty Ltd., Brisbane

Sales and Manufacturing Location
88 Brickyard Road,
Geebung 4034 QLD
PO Box 85, Virginia DC,
QLD 4014

Tel: +61 7 3867 5555

Fax: +61 7 3867 5566



Aqseptence Group SAS, Availles-en-Chatellerault

Sales and Manufacturing Location
Zone Industrielle
86530 Availles-en-Châtellerault

Tel: +33 5 4902 1600

Fax: +33 5 4902 1616



Aqseptence Group GmbH, Karlsruhe

Sales and Manufacturing Location
Hardeckstrasse 3
76185 Karlsruhe

Tel: +49 721 5001 0

Fax: +49 721 5001 213


North America

Aqseptence Group, Inc., New Brighton, MN

Sales and Manufacturing Location
1950 Old Hwy 8 NW,
New Brighton, MN 55112

Tel: +1 651 636 3900

Fax: +1 651 638 3171


South America

Aqseptence Group S.A., Santiago

Sales and Manufacturing Location
Av. El Roble 315
9390381 Lampa, Santiago

Tel: +56 02 9280700

Fax: +56 02 9280705


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