Hand Rake Screen (HRS)

- High screenings capture capacity.
- Low head loss due to large effective bar spacing.
- Extremely reliable and versatile through its robust design

Trustworthy separation of screenings from wastewater

-          High screenings capture capacity.

-          Low head loss due to large effective bar spacing.

-          Extremely reliable and versatile through its robust design

Principle and Function

The Wamechsi Group HRS are multi-raked, hand operated screens which are generally used as coarse and fine screens for medium and large sized waste water treatment plants. The HRS mainly consists of bar screens, frame and scrapper which is equipped with multi-rakes.

High screenings discharge capacity and low head loss is achieved by the help of the multi-rakes. It is proper equipment for removal of solids from all kinds of water and wastewater. Steel bars spaced at a specific distance are used to catch coarse and even fine debris. The Hand rake scrape the screening bars to carry the debris and discharge them to a drying platform, which typically consist of a perforated plate.

Thecnical Data: (Typical)


Screen Aperture:              

Screen Bar Profile:             

Headloss at Peak Flow:               

Operating Range of Unit:        

Screen Bar Height:            

Screen Width:                

Overall Width of Screen:        

Discharge Level (above top channel):

Material of All Components:                

Install Angle:                 

Working Environmental Conditions

-          Environment Type: Industrial, wet, pollution degree 3.

-          Temperature: From -20 [˚C] to 40 [˚C]

-          Humidity: From 40 [%] to 100 [%]

Advantages of the Wamechsi Group Hand Raked Screens:

-          Low head loss due to large effective bar rake surface.

-          High screenings capture capacity.

-          Compact design and drying platform.

-          Independently replaceable rake and comb plates



The Wamechsi Group Hand Front Raked Screens consists of the following key parts:

-          Debris Screen

The debris screen is placed in line with the inlet flow at the inlet-works of the wastewater treatment plant. The obstruction due to the rakes prevents medium to large sized debris from entering the rest of the treatment plant. The Wamechsi Group Hand Rake Screen uses a stationary screen field with openings ranging from 3 to 25 [mm] or wider, depending on customer preference.

-          Hand Rake Bar

Debris is removed from the screen field periodically by manual operator. The rake bars’ teeth engage between the bars of the screen field and comb debris upward where the debris is removed manually.

-          Drying Platform

The debris is raked to the top of the Wamechsi Group Hand Raked Screen and onto a drying platform, which typically consist of a perforated plate.

The Wamechsi Group’s Hand Raked Screens operates as follow:

Influent to a waste water treatment plant (WWTP) contains quantities of floating and suspended solids. The purpose of the screen is to remove particles that can damage, block or cause excessive wear to pumps in the subsequent parts of the plant.

The screen has no motorized cleaning equipment therefore the screen face must be cleaned manually by hand. They are commonly used in mechanical front rake screen bypass channels.

The equipment is used to filter out unwanted debris from industrial and municipal wastewater. The hand rake screen is installed in the inlet-works of the municipal wastewater treatment works, all the wastewater flows through the different types of screens, resulting in debris free wastewater flowing through the plant for further processing of the wastewater. The type and size of the screen is dependent on the width of the channel and the flow of the plant.

 It is advised to be skilled in the safe use of the plant, and in the maintenance which needs to be carried out by taking into account both the technical and safety rules.