Self Cleaning Filter Self-cleaning filter system designed to automatically and continuously remove solid particles by backwashing filter elements from 25 µm to 6000 µm. The liquids subjected to filtration can be different: sea water, well water, groundwater, river and surface water, crude oil, fuel oil and etc. The construction materials can be from cast iron, carbon steel and stainless steel to special austenitic ferrite steels such as Duplex, Super Duplex, Nickel alloys and Titanium in customized dimensions. These filters are designed based on all international design codes such as ASME,  BS, VSR and etc.

Auto Back Wash Filters also known as Self-Cleaning filters are the best solution for continuous separation of solid particles in small to big Oil, Gas. Water and Waste Water Treatment plants.

This advance filters keeps clean the filter element surface constantly to be insure maximum filtering efficiency. Filtration performs with passage of the liquid through the filter elements from the inside to the outside or vice versa depending on the chosen type. During the cleaning phase a small part of pressurized clean fluid returns back to each filtering element.

This process is managed by an automatic control system that starts and stops an electric motor which opens and closes the automatic drain valve. The filter is washed without interrupting the outlet flow.

 

Application of these filters is includes but not limited to:

 •  Protect catalyst beds from contamination and plugging by removing coke fines, dirt and other solid contaminants, amines and chemicals.
 •  Power Plants by removing solid contaminants, naphtha, diesel and etc.
 •  Seawater intake Units
 •  Cooling tower filtration
 •  Desalination plants
 
To determine the number of filter elements, following process parameters would be specified by the customers:

 •  Flow Rate

 •  Solids Content

 •  Fluid Viscosity

 •  Allowable Pressure Drop

Our expertize in cooperation with reputable European companies made us able to increasing operating efficiency and production yield in maximum flow rate with minimizing required backwashing sequences.

    self 2

Operation Mode:

Element Type

 

Phase 1 - Filtration

The water to be filtered enters from the inlet nozzle A and flows into the filtering elements (candles) from the bottom side.

The water flows from the inside to the outside of the candles. Solid particles are retained on the inner side of the candles, while the water leaves the vessel via the outlet nozzle B.

As more and more impurities build-up on the candles surface, the differential pressure ΔP measured by the differential gauge 2 gradually increases with time until it reaches the set point value; the backwash valve 4 opens and the Phase 2 (Filtration and Cleaning) starts.

 

 

Phase 2 - Filtration and Cleaning

While the candles are in filtration mode, the candles aligned with the rotating backwash mechanism 3 are cleaned by the reverse flow of filtered water drawn from the outside to the inside of the candles by the differential pressure with the nozzle C through the open backwash outlet valve 4. All the candles are then cleaned by the rotating backwash mechanism 3 operated by the motor 5.

At the end of the backwash set-time, the motor 5 stops and the backwash valve 4 closes, thus returning to normal filtration (Phase 1).

 

Suction Basket Type

The Filtering process

Raw water enters from the filter inlet and passes through the screen and Clean water flows through the filter outlet. The gradual dirt build up on the inner screen surface causes a filter cake to develop, with a corresponding increase in the pressure differential across the screen. A pressure differential switch senses the pressure differential and when it reaches a pre-set value, the cleaning process begins.

 

The Cleaning Process

Cleaning of the screen is performed automatically once the pressure loss (ΔP) across the filter has reached the pre-set value normally 0.5 bar (7psi). The flushing valve opens, pressure is released from the hydraulic piston, and a split of clean water is discharged through the flushing valve. An electro-motor simultaneously rotates the dirt collector and moves it along its axis. The combination of the vertical movement and rotation guarantees that the suction nozzles will cover the entire internal screen surface, efficiently cleaning the screen. The whole process takes 5 seconds. During the whole process water supply is uninterrupted

        Suction Type

Brushing Basket Type

The Filtering process

Raw water enters from the filter inlet through the fine screen, trapping dirt particles which accumulate inside the filter.  Clean water flows through the filter outlet. The gradual dirt build up on the inner screen surface causes a filter cake to develop, with a corresponding increase in the pressure differential across the screen. A pressure differential switch senses the pressure differential and when it reaches a pre-set value, the cleaning process begins.

 

The Cleaning Process

Cleaning of the screen is performed automatically once the pressure loss (ΔP) across the filter has reached the pre-set value normally to 0.5 bar (7psi). The flushing valve opens, and a split of cleaned water is discharged through the flushing valve. The electric motor rotates the brushes and as the result brushes traverse the entire internal screen surface, removing trapped debris. The whole process lasts for just a few seconds. During the whole process water supply is uninterrupted.

       Brushing Type

 

 

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