Product category:
Hydrometry, Environment and Floods
News Release from: Johnson Screens UK | Subject: Intake screens
Edited by the Processingtalk Editorial
Team on 18 October 2007
Screens for abstraction intakes
The Passive Wedge Wire Cylinder (PWWC) screens that are identified in the Environment Agency "Screening for intake and outfalls: a best practice guide" are manufactured by Johnson Screens
If you are abstracting surface water or need to apply for an abstraction licence, then you need to be aware of the contents of this best practice guide Johnson Screens manufacture high capacity, low velocity surface water intake screens that protect aquatic life, whilst drawing fresh or marine / estuarine water
This article was originally published on Processingtalk on 26 Mar 2007 at 8.00am (UK)
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With its innovative hydraulic design, the Johnson Water Intake offers trouble free operation, with no maintenance or debris to dispose of, while being environmentally friendly, even in shallow waters
Screens are self cleaning when incorporating our Hydroburst compressed air scour system.
The screens meet the requirements of the Environment Agency best practice guide.
Screens are typically manufactured from Stainless Steel 304 or 316L when used in fresh water applications.
Copper Nickel screens are popular for marine applications due to its anti bio fouling capabilities.
More severe applications may need the use of Duplex or Super duplex alloys.
Johnson Screens offer an alloy assessment service for selection of the appropriate metal for each installation.
Water flow modifiers within the screen ensure that slot velocity at the screen surface minimise the impingement of fish and fish eggs that come into contact with the screen, giving the capability to significantly reduce the loss of fish stocks.
If you would like a copy of the best practice guide please contact the Environment Agency at www.environment-agency.gov.uk and ask for science report SC030231, or contact Philip Schofield at Johnson Screens.
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