1mW Sewerage Design to MSIG 006
Primary Screen Chamber
Primary screen is used to filter large components that enter the treatment plant with sewage. By stopping materials such as wood and debris, primary screen protects the equipment from damage, and reduce the interference to plant performance. To achieve this, the clear spacing of screen should be 25mm or less.
The screen is designed to withstand flushing velocity, which is usually taken as 1m/s. On top of the screen, minimum 200mm diameter uPVC overflow pipe is provided. Minimum 150mm freeboard is provided below the overflow pipe. The purpose of overflow pipe is to allow sewage to bypass the screen when it is blocked, and prevent backflow or overflow from the screen chamber.
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