Aquashear Coanda Multiple Screens

Standard aperture 1.0mm
One-piece welded construction with integral endplates (except Type A)
All 304 stainless steel (316 available on request)

The multiple screens are designed to be bolted together to make longer screens for larger projects.

There are five types of multiple screen models; Type A, Type AB, Type C, Type F and Type K.

The Type A and Type AB screens are full height screen with a head loss of 1270mm; the Type A screens have a removable screen panel for applications with very abrasive sediment loads. All the other screen types are of fully-welded construction. Type C screens are half height with a head loss of 700mm; the Type F screens are quarter height with a head loss of 450mm. The Type K screens are double height screens, with a head loss of 1900mm.

With the exception of the Type A screens, all the screens can be equipped with boulder protection bars.

Features & Benefits

Aquashear coanda screens enable revenue to be maximised by increasing water flow.
They eliminate operational costs of erosion damage.
The screens exclude silt and debris greater than 1mm, enabling a low project maintenance.
Aquashear screens reduce capital costs by removing requirements for settling tanks.
They are easy to install, with no moving parts, will continue to operate at low temperatures without freezing and are aquatic life friendly

Full Height

Type A – Full Height (1270mm Head loss)
These screens have an abstraction capacity of 140 l/s per metre width, and a head loss of 1270mm. Three widths of Type A units are available:

Type	Width (mm)	Rated Flow (l/s)	Frame Weight (kg)	Screen Weight (kg)	Drawing
A-1534 (Full width)	1534	210	108	47	AQS-001/2
A-1010 (Two-third width)	1010	140	72	31	AQS-001/2
A-510 (Third width)	510	70	44	16	AQS-001/2

Type AB – Full Height (1270mm Head loss)
These screens also have an abstraction capacity of 140 l/s per metre width, and a head loss of 1270mm. Two widths of Type AB screen units are available:

Type	Width (mm)	Rated Flow (l/s)	Weight (kg)	Drawing
AB-1000 (Full width)	1000	140	63	AQS-005
AB-500 (Half width)	500	70	35	AQS-005

Half Height

Type C – Half Height (700mm Head loss)
These screens also have an abstraction capacity of 66 l/s per metre width, and a head loss of 700mm. Two widths of Type AB screen units are available:

Type	Width (mm)	Rated Flow (l/s)	Weight (kg)	Drawing
C-1500 (Full width)	1500	100	50	AQS-010
C-750 (Half width)	750	50	50	AQS-010

Quarter Height

Type F – Quarter Height (450mm Head loss)
These screens have an abstraction capacity of 35 l/s per metre width, and a head loss of only 450mm. Two widths of Type F screen units are available:

Type	Width (mm)	Rated Flow (l/s)	Weight (kg)	Drawing
F-1000	1000	35	27	AQS-040
F-1500	1500	50	34	AQS-041

Double Height

Type K – Double Height (1900mm Head loss)
These screens also have an abstraction capacity of 250 l/s per metre width, and a head loss of 1900mm. The Type K screen is available in 1m wide units:

Type	Width (mm)	Rated Flow (l/s)	Weight (kg)	Drawing
K-1000	1000	250	165	AQS-080

Case Studies

Doorian 310kW Intake rebuild

Having provided operation and maintenance services at the site since 2007, Dulas were contracted by Celtic Hydro to design a new intake structure to enable the installation of Coanda screens and increase plant generation. Read more.

Frastanz Hydro Intake Refurbishment – Austrian Alps

Austria hosts the largest Aquashear installation in the Alps, with screens retro-fitted to the existing intake of the E-Werke Frastanz hydro scheme. The original bar screen intake and tunnel system were prone to blockage from gravel filled glacial melt water, to the extent that the scheme was almost abandoned. Read more.

Inverhaggernie Intake Refurbishment

Dulas was contracted to carry out the design and consenting of a new intake with AquaShear Coanda intake screens and to act as the Client’s Engineer during the construction phase. Read more.

Multiple screen installations in Scotland

As well as small single-screen sites, there are now more than half a dozen multiple screen intakes, including those for the Glendoe project. Read more.