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Drum Screen

A Hubert drum screen is designed to filter very large flow rates in a water intake

A  Hubert drum screen is a rotating (secondary) filtration system used in a fresh or sea water intake. This machine is self-cleaning fully automatic screen suitable to filter very large flow rates at a relatively fine filtration degree.

Every project location is different. As a result, excavating and civil engineering cost vary from site to site and have a important influence on the choice of screening system.

Compared to travelling band screens, drum screens can rotate faster and consequently able to handle more debris. In addition, these screens can often manage with shallower pits.

Hubert supplies its own designs where possible, however all systems are engineered as per your project specifications. If you prefer a different design, we can of course also supply this. We are happy to advise you to make the best choice for your project. When renovating existing installations (which have been in operation for many years), (dated) designs are often used or, if possible, the civil construction is adapted to a modern design.

Part of the design is also a vertical or horizontal arrangement: vertical drum screens are common at seawater intakes in combination with very large water flows, horizontal drum screens are often used for microfiltration during fresh water intake.

Below you will find an explanation of frequent applied drum screens.

Hubert water intake drum screen
Hubert case study Yanbu II

Hubert – Water Intake Systems

Hubert – specialist in water intake systems for cooling, drinking and process water

Hubert is market leader in water intake screening systems. These systems can be found in power stations, petrochemical plants & refineries, desalination plants, drinking water & irrigation plants and industrial production plants requiring a huge demand of process water. We supply complete complete ‘screening trains’ including all additional equipment, like controls and cathodic protection. We design, engineering and manufacure our equipment in-house. 

You will find our projects in both new construction (EPC) projects and renovation & optimization of existing water intakes.

Water intake systems are used for mechanically clean water extracted from the sea, rivers or lakes. See also Markets & Applications.

Hubert – Water Intake Systems

Hubert – specialist in water intake systems for cooling, drinking and process water

Hubert is market leader in water intake screening systems. These systems can be found in power stations, petrochemical plants & refineries, desalination plants, drinking water & irrigation plants and industrial production plants requiring a huge demand of process water. We supply complete complete ‘screening trains’ including all additional equipment, like controls and cathodic protection. We design, engineering and manufacure our equipment in-house. 

You will find our projects in both new construction (EPC) projects and renovation & optimization of existing water intakes.

Water intake systems are used for mechanically clean water extracted from the sea, rivers or lakes. See also Markets & Applications.

Hubert case study Yanbu II

Typical Layout of a Drum Screen

 

Vertical drum screen assembly for EDF’s nuclear powerplant Flamanville 1 & 2 in France

This movie shows  a vertical drum screen applied for a seawater intake

Vertical Drum Screen

A Hubert vertical drum screen is the ‘heart’ of the ‘screening train’

A Hubert (vertical) rotary drum screen is mainly used used for (sea)water intakes as part of power plants and desalination plants, where tidal differences can also play a role.

A drum screen is typically installed in water intake systems downstream from coarse bar screens.

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. This movie gives an impression of a vertical drum screen during assembly.

Horizontal (Micro) Drum Screen

Hubert micro screen: potable water production & proces water recirculation

A Hubert horizontal rotary micro screen, micro drum screen or micro strainer, is often used in places where high demands are required on the purity of process water. These filters can be found in (fresh) water intakes, acting as (fine) pre-filtration system being part of potable water production plants or production plants that consume a lot of process water.

In addition, this filter can be also applied for process water recirculation. The recovery of useful raw materials from process water, stricter discharge requirements, recycling of process water, etc. makes the use of these engineered filters increasingly interesting.  Another pre-treatment of influent & effluent in a waste water treatment plant.

Flow rates can be up to 5000 m3/h per screen, depending on customer requirements and the local situation at the intake. Woven mesh with a diameter of about 11 up to 500 micron is used as filter medium. This type of filter is usually applied under free fall conditions. The efficiency and capacity of a microstrainer in a water intake, depends on several factors including the characteristics of the fine filtration mesh (fabric), rotation speed of the microscreen, the quality of the water to be purified and the amount of backwashing water.

Vertical Drum Screen

A Hubert vertical drum screen is the ‘heart’ of the ‘screening train’

A Hubert (vertical) rotary drum screen is mainly used used for (sea)water intakes as part of power plants and desalination plants, where tidal differences can also play a role.

A drum screen is typically installed in water intake systems downstream from coarse bar screens.

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.This movie gives an impression of a vertical drum screen during assembly.

ubert drum screen vertical
Hubert drum screen
Hubert drum screen
Hubert drum screen
Hubert fish recovery system

Design, Construction & Operation

The drum is placed in a concrete pit or tanks and rotates on a stationary hollow shaft. The water to be filtered flows through the drum panels and the dirt particles remain trapped in the mesh.

Hubert vertical drum screens are available for different flow patterns see further on this page, or see page Flow Patterns Drum Screen for a comparison between different flow patterns.

As the drum rotates the row of sceen panels pass under or above a set of high pressure water jets at the top of the drum. The dirt particles are washed from the screen and discharged through a debris collector system.

The Hubert vertical (rotary) drum screens are designed with A-shaped spokes, resulting in high rigidity and resistance to deformation. This produces an accurate fit against pit walls, enabling filtration of particles down to 2 mm. All Hubert drum screens are fitted with maintenance free slide (sea)water lubricated bearings. The same applies to the ring gear and drive pinion, which are made of special wear resistant polyamide.

Fish Friendly - Fish recovery system

Hubert’s drum screens can be supplied with a fish recovery gutter or channel that allows trapped fish to be removed in a gentle and effective way. These recovery systems are tailor-made for each project.

Features & Benefits

  • Large flow capacities
  • The A-spoke construction results in a light stable and rigid structure
  • Reliable
  • Maintenance free
  • Long lifetime (30 years or more)
  • Resistant to abrasive water
  • Debris is removed at or above deck level, eliminating the need for a debris pump
  • Savings on spare parts
  • (Sea)water lubricated bearing
  • Spray water cleaning
  • Fish removal system

Standard Dimensions & Materials

  • Drum width up to 5 m
  • Drum diameter up to 20 m
  • Mesh opening 2/ 10 mm
  • Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) Duplex grades)

Vertical Drumscreen – Flow Patterns

Hubert supplies  both ‘Dual Flow’ and ‘Center Flow’ pattern.  A ‘Dual Flow’ configuration has some advantages against ‘Center Flow’. In case of a newly built plant, Hubert advises the ‘Dual Flow’ pattern. More information about the differences and a comparison in flow patterns can be found on page Flow Patterns Drum Screen .

Hubert drum screen flow directions

Horizontal (Micro) Drum Screen

Hubert micro screen: potable water production & proces water recirculation

A Hubert horizontal rotary micro screen, micro drum screen or micro strainer, is often used in places where high demands are required on the purity of process water. These filters can be found in (fresh) water intakes, acting as (fine) pre-filtration system being part of potable water production plants or production plants that consume a lot of process water.

In addition, this filter can be also applied for process water recirculation. The recovery of useful raw materials from process water, stricter discharge requirements, recycling of process water, etc. makes the use of these engineered filters increasingly interesting.  Another application is pre-treatment of influent & effluent in a waste water treatment plant.

Flow rates can be up to 5000 m3/h per screen, depending on customer requirements and the local situation at the intake. Woven mesh with a diameter of about 11 up to 500 micron is used as filter medium. This type of filter is usually applied under free fall conditions. The efficiency and capacity of a microstrainer in a water intake, depends on several factors including the characteristics of the fine filtration mesh (fabric), rotation speed of the microscreen, the quality of the water to be purified and the amount of backwashing water.

Hubert microscreen
Hubert microscreen
Hubert microscreen
Hubert microscreen
Hubert microscreen

Design, Construction & Operation

The Hubert micro screen system consist of a drum fitted along its outer circumference with screen panels. The drum is placed in a concrete pit or tanks and rotates on a stationary hollow shaft fitted with one or more funnel-shaped debris collectors. The feedstock of water enters the drum axially and flows radially through the mesh panels. The dirt particles remain trapped in the mesh.

As the drum rotates the row of sceen panels pass under a set of high pressure water jets at the top of the drum. The dirt particles are washed from the screen and discharged through the funnel-shaped debris collectors and the hollow shaft.

The “clean” side of the screen compartiment is fitted with an overflow weir which enables the water inside the screening chamber to be kept at a constant level. This ensures that the largest possible screening area is constantly submerged resulting in a high yield of solids.

Fish Friendly - Fish recovery system

Als our microscreens can be provided with a fish recovery system that allows trapped fish to be removed in a gentle and effective way.

Features & Benefits

  • Light, stable and robust construction
  • Reliable
  • Maintenance free
  • Long lifetime (30 years or more)
  • Resistant to abrasive water

Standard Dimensions & Materials

  • Drum length up to 6 m
  • Drum diameter from 0,7 up to 3,5 m
  • Mesh opening from 11 to 500 micron
  • materials can be stainless steel and exotic alloys (a variety of (super) Duplex grades)

Hubert: no. 1 supplier for screening!

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Our Clients

  • Hubert Clients & References
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