The process is based on two rotating concentric drums whose axis is horizontally tilted (up to an angle of 10°). The inner drum has large (10mm) perforations and the outer drum has replaceable fine mesh panels (typically 3mm square mesh).
The circulating fluid and waste pass through a flow control device into the inner drum. The fluid then passes through both drums and via magnets into a collecting tank below the drums and back to the platform mud circuit.
The Swarf is retained within the drums and due to the angle of inclination and the rotation of the drum is caused to travel down the length of the drum exiting the open end and by way of a chute into waste skips for disposal.
For details on the SHU click here