Hydrok Raw Water Intake Screen™

The Hydrok RWIS has been developed by the Design, Engineering and
Manufacturing teams based on their vast experience of screening technologies
utilising their years of experience designing and manufacturing CSO screens.

A growing requirement for stricter clean water screening, eel screens and for fish protection
for water extraction from reservoirs and rivers for use as drinking water has led
Hydrok to develop highly flexible and adaptable screen designs that are able to match
the consent requirement of different raw water sources. The Hydrok wedge wire screens
can be made to fit the consent requirement from 2mm to 10mm or as required and are
manufactured in the UK at the Hydrok factory, offering a bespoke raw water extraction
solution to meet the specified demand of each specific water source. The Hydrok RWIS solution
complies with the EU Habitats Directive and the Eel Directive for England & Wales.

The Hydrok Progressive Velocity Flow Distributor™ (Hydrok PVFD™)

All raw water intake screens are prone to clogging with water source debris
and aquatic life which needs to be addressed to maintain the operational functionality
of the screen. The Hydrok wedge wire profiles will match the water consent requirement
through regular purging of the screen in order to maintain the correct intake flow to the
pipe work. Hydrok have developed an inner purging system that at pre-determined intervals,
or manually if needed, backwashes the intake screen through an innovative Progressive Velocity
Flow Distributor which maintains the flow rate within the intake screen from the source.
Developed at the Hydrok in-house R&D facility and first prototyped in 2009, this patent
pending design works like a colander with variable orifice sizes to meet the demand of the flow
rate needed. The PVFD sits within the main intake screen and is fed by compressed air to purge
the screen as required.

Dual Action Screen Purging

At pre determined intervals a controlled, calculated volume of compressed air is used to
purge the screen which creates a 2 stage backwash, firstly with the displaced water within
the pipe and secondly by high pressure compressed air blowing through the PVFD and removing
any accumulated materials. The Hydrok design team calculate the compressed air requirement and
size it to suit the scheme and location accordingly. If more than one intake screen is required
these can be installed in series so that each intake screen is purged in sequence to meet the
water consent requirement.

Hydrok are able to offer a complete turn-key solution of the Hydrok RWIS from bespoke design and manufacturing
to installation, including the control centre technology and maintenance programmes.