Spiral-wound wedge wire screens provide effective filtration

The METROL SEA-SCREEN coarse strainer permits seawater to enter the bottom of the strainer basket, pass vertically upward, and then proceed radially outward through the strainer screen. The screen has a spiral-wound wedge wire construction. Slot sizes in the screen are precisely manufactured using extremely accurate laser technology. We provide screens capable of removing particles down to 25 um.

As seawater passes through the screen, solids greater than the size of the strainer slot become trapped in the vertical recesses on the inner face of the screen. The strained water exits the vessel through the vessel outlet.

High backwash velocity efficiently cleans screens

Over time, the volume of solids trapped in the recesses slowly increases, which is observed as an increase in differential pressure across the screen. After a certain time in service, the filter element must be cleaned by backwashing to remove the trapped solids. Automatic backwash can be initiated by time interval, high differential pressure, or manually.

Once backwash is initiated, a valve opens and a gearbox and motor slowly rotate the collector shaft and head one and a quarter revolutions inside the basket, ensuring that the complete inside surface of the screen is swept. 

The vessel stays online during a backwash cycle, and when the backwash valve is opened, the pressure difference between the vessel and the backwash outlet is sufficient to cause the water to flow back through the screen to the collector heads, down through the collector shaft and the backwash valve to disposal.

The backwash velocity is approximately 10 times that offered by other designs, providing the most efficient screen-cleaning regime on the market.

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