Through-flow (thru-flow) travelling water screens — the proven workhorse fine screen for water and desalination intakes, with flow passing straight through ascending and descending screen baskets.
Intake Screening for Water & Desalination Plants
In a through-flow band screen, raw water passes through the front (ascending) face of an endless belt of mesh baskets. Debris collects on the baskets, which travel up, are spray-washed into a debris trough, and the cleaned baskets return down the back face. It is the original and most common travelling-screen configuration, screening typically 1–10 mm.
Travelling water screens were developed in the early twentieth century (from the 1890s–1920s) to protect steam-condenser cooling-water intakes at power stations. The through-flow arrangement — water entering the front face and exiting the rear — was the original design and remains the most widely installed type a century later, refined with fish-handling (Ristroph) buckets and dual spray-wash.
Configurations in service
Debris washed off on the rising front face; simplest, most common layout.
High-pressure debris wash plus low-pressure fish-return spray on Ristroph baskets.
Lifting buckets and low-pressure return troughs release impinged fish alive.
Concrete-channel or self-contained frame units to suit civil arrangement.
An honest engineering assessment
Typical applications
Through-flow band screens suit power-station cooling-water intakes, river and reservoir abstraction, and moderate-debris desalination intakes where capital cost and simplicity are priorities and carryover is acceptable.
The full intake-screen series
A companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreThe screening stage of the seawater intake series.
Read MoreIntake design integrated with SWRO pre-treatment.
Read MoreThe full seawater intake hub — structures, fouling, materials.
Read MoreBar, band and drum screens across our range.
Read MoreOur engineers select and size intake screening — through-flow band and the full train — matched to your debris load, fish-protection duty and downstream process.
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