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Water Intake Systems /
Screening Machinery
Water intake systems – mechanically water cleaning
Water intake systems are used for mechanically clean or screen water extracted from the sea, rivers or lakes. Mechanical cleaning removes entrained (floating) matter with screens or sieves. This protects the downstream process stages from buildup, clogging and abrasion. The aim is to protect suction pumps and other downstream equipment such as desalination membranes, heat exchangers/ condenser tubes or from the carry-over of coarse and fine debris.
Water intake screening systems are used for filtering:
- cooling water for power plants (combined cycle, nuclear, thermal & hydro)
- process water for industrial production processes, like petrochemical plants and refineries.
Our intake screening machines also filter raw water for potable or drinking water plants, desalination plants, drainage channels, fire fighting channels, and irrigation offtakes. Other examples are food processing and mining.
A water intake system can be composed of sluice gates and stoplogs, coarse screens, (micro) drum screens and travelling band screens. Below you will find more information.
Separation of liquids from solids
Water intake systems are used for screening or filtration of intake water. Screening is a filtration process which separates liquids from solids. Solids can be defined as waste or debris and living creatures or matter in (intake) water, like fish (often cuttle and jellyfish), crustacans (for example mussels), eggs, larvae, plankton, etc.
Solids with relative large diameters are trapped in primary coarse screens. Finer secondary screens remove smaller residual materials. Measurement of the difference in water level between the front and the back of the screen determines the degree of contamination and initiates the cleaning of screens when necessary.
The filtrated water distributed to a plant’s downstream system is free from particles larger than the aperture (mesh opening) of the secondary screening step accomplished by drum screens or travelling band screens.
Lowest operating cost and fish friendly
Our solutions are environmentally-friendly and are used in both submerged passive water and open surface water intakes to deliver debris free water. In addition, our systems can be supplied with a fish recovery system that allows trapped fish to be removed in a gentle and effective way.
The made to measure design of our screening systems allows for lowest operating and maintenance costs, including maximum performance & reliability, effective design, quality and particle-free filtered water. Our cathodic corrosion protection systems (based on ICCP, impressed current) stand for corrosion resistance and longer lifetimes in sea water. Today, a lot of duplex and super duplex (PREN > 40) is used for screens.
You will find our projects in both new construction (EPC) projects and renovation & optimization of existing water intakes.
Typical layout of a water intake ‘screening train’
Hubert water intake system, a ‘screening train’
We design, manufacture and supplys complete water intake ‘screening trains’, including derived equipment and controls. An average ‘train’ consist of:
Step 1:Â stoplog or sluice gate – closing chanel inlet for maintenance (downstream)
Step 2: coarse screens, static, cable hold and revolving screens – primary-filtration
Step 3:Â drum screen and / or travelling band screen – secondary / fine filtration
Step 4:Â Â stop log or sluice gate – closing chanel exit for maintenance (upstream)
Below you will find an explanation of frequent applied subsystems.
Stoplog and Sluice Gate
Hubert stoplogs: rapid and secure closure of channels and pump chambers in a water intake system
A Hubert stoplog (also called ‘stop gate’ or ‘penstock’) and sluice gate makes periodic inspection and maintenance of screening systems and pumps possible by dewatering the separated part of the channel. Our stoplogs are designed as per client’s specifications.
Coarse Screen
A Hubert coarse screen is a primary filtration screening system as part of a water intake system
This type of screen or rack is the first barrier in a screening system and is intended to withstand and remove all large to relatively small contamination. Debris can be natural like seaweed and jelly fish, or man-made, plastic, etc.
It is often a robust static bar rack with or without an automated trash rake system per screen or for several screens next to each other. Hubert supplies various coarse screens tailored to every (local) situation. Examples are static bar screens, revolving coarse screens or rotating rake screens and cable operated bar screens.
Drum Screen
A Hubert drum screen is used for large flow rates at a relatively fine filtration degree
A drum screen is a self-cleaning fully automatic screen suitable to filter very large flow rates at a relatively fine (secondary) filtration degree. Regularly occurring flow rates are between 40.000 and 120.000 m3/h per screen, depending on customer requirements and the local situation at the intake. Woven mesh with a diameter of about 2-3 mm is used as filter medium. We recognize vertical and horizontal drum screen applications. This movie gives an impression of a vertical drum screen during assembly.
Travelling Band Screen
A Hubert travelling band screen is a compact solution designed for fine filtration
A travelling band screen, also called ‘travelling water screen’ is designed for fine (secondary) filtration of surface water. A traveling band screen requires only a small installation area due to the compact vertical construction. This type of screen is used in places where the construction area of the total cleaning installation is limited or where big differences occur between high and low water levels.
