Mechanical & Manual Screens

Bar Screens are designed for the continuous operation to provide free racking of the vertical screen grid by means of parallel raking beams continuously. Micro raked bar screens remove suspended and floating coarse debris such as weed, reed, rags etc., from surface water. These screens are mainly used in:

Pumping stations
Sewage treatment plants
Cooling water inlets

The various types of bar screens are of robust design and made of suitable steels. Vertical screens are arranged across the channel and dead plate fix area is between the top of the bars and it is the discharge point of the debris.

Manual Bar Screen

Manual bar screen with vertical flat bars spaced apart is used to prevent large and medium floating debris from travelling further into the screening chamber. These are generally installed at the upstream of Mechanical bar screen as well as a standby to the mechanical bar screen. Cleaning of screen is done manually with the help of manual rake comb provided with the screen. Manual screen can be provided either as fixed type or removable type.

Clear gap	6 mm and above.
Channel width	Maximum up to 3,000 mm.
Channel depth	Maximum up to 5,000 mm.
Mode of operation	Manual
Material of Contruction	Carbon Steel / Stainless Steel 304, 316 / Duplex / Super Duplex. Other Material on request.

Multirake Bar Screen

Micro Screens is a heavy duty multi-rake screen provided with inclined bars spaced apart to prevent medium and large floating wastes from travelling further to the pumps located in the pumping station. The inclined bar screen is stationery and is cleaned by a mechanized rake that rakes the screen upwards to deposit the raked waste to a waste discharge bin / conveyor. Multiple number of rakes are provided to clean the waste depositing on bars continuously at a pre-decided time interval. This medium duty screen is provided with flat bars, chain link of 6-inch.

Bar Spacing	8 mm & above
Channel width	500 mm
Channel depth	Maximum up to 12,000 mm.
Mode of operation	Motorized
Material of Contruction	SS 304 & SS 316

Step Screen (Fine Screen)

Micro step screen is hydraulically operated Step screen provided with 2 & 3 mm thick equally spaced inclined lamellas to prevent fine sized floating debris from travelling further in to the water and waste water treatment plants. The lamella assembly comprises of a fix set of lamellas and a movable set of lamellas installed at an angle of 40 degree and provided with inverse steps to promote mat formation. The movable lamellas lift the mat of waste deposited over the screen width and deposit them a step above on the set of fixed lamellas. After depositing the mat of debris on to the fixed lamellas, the movable lamellas go back to its lower home position to start a new operation cycle. This way the mat of debris keeps moving upwards in steps till it reaches the discharge point & further to a discharge bin / conveyor. This is a self-cleaning type of screen and does not require any external rake arrangement for lifting the debris deposited on screen.

Bar Spacing	2 mm to 3 mm
Channel width	500 mm to 1600 mm. smaller width on request
Channel depth	1850 mm
Mode of operation	Hydraulic
Material of Contruction	SS 304 & SS 316

Half Drum Rotary Screen

Key Features:

Ideal for pre-screening MBR feed to safeguard membranes from abrasion or damage caused by solid particles.
Features a perforated, semi-circular screening element.
Equipped with multiple rotating cleaning brushes made of nylon or polypropylene.
Constructed from carbon steel with a powder-coated finish or stainless steel (304/316).
Available with hole sizes of 1 mm, 2 mm, 3 mm, and 5 mm.
Specifically designed for MBR applications.
Includes a piped inlet for efficient flow management.
Designed for continuous, uninterrupted operation

MODEL	FLOW RATE IN CUM/Hr (m3 /hr) AS PER HOLE DIAMETER				POWER	INLET SIZE
	1 mm	2 mm	3 mm	5 mm	HP	NB
MHDS 800 -400	30	40	60	80	0.25	150
MHDS 800 -700	45	60	90	120	0.25	200
MHDS 1200-500	60	80	120	160	0.5	250
MHDS 1200 – 1000	115	150	220	300	0.5	300
MHDS 1600 -1000	160	210	310	420	0.5	400
MHDS 1600 – 2000	320	420	620	840	0.5	500

Screw Screen

These screens are intended for medium and small waste solids from effluent channel and recommended to be used in wastewater treatment plants. It is suitable for effluent channel width from 200 mm – 600 mm and depth up to 4 metres. The perforated sheet provides high efficiency of filtration and screw is equipped with a brush on it’s edges to ensure cleaning of screen media in filtration zone. The trash retaining screen is made of stainless steel in the form of perforated sheet / wedge wire screen and has larger area for filtration due to inclination in effluent channel. Waste retained on the filtering screen are removed by axially rotating screw conveyer up to waste bin.

Basket Screens

This screen can be installed in a Manhole prior to pumps, the size depending on the inflow rate and depth. The sturdy, stable basket screen retains the floating debris at the sewer outlet. The screen bottom plate is perforated to allow static dewatering of the retained material. When a certain amount of material has accumulated, the screen basket is lifted upwards by an electric hoist. The vertical basket movement is supported by a stable carrier and guide rails. These rails are curved in the upper section to ensure a partly automatic discharge into a suitable container. While the screenings are transported upwards in the basket, material which could impair the function of downstream pumps is removed by a fall screen supported on guide rollers. Control of the screen can be either manual or electrical.