The multi-tube shop-assembled Dustaclone from Thermax, consists of a housing containing a number of collection tubes, each of which is, in fact, a centrifugal dust collector. The dust laden gas entering the dirty air plenum moves downwards into the collecting tube (refer figure), being guided by a helical vaned annular ring. These vanes impart a smooth spiral movement to the gas, setting up a high centrifugal action.As the gas descends in a cyclonic pattern, the dust is thrown outwards and is discharged through peripheral slots in a shave-off boot. A vortex is formed at the bottom of the centrifugal tube and the clean gas forms an inner whirl which ascends vertically into a discharge (outlet) tube, and then collectively out of the unit through the outlet plenum.All the collectors are completely assembled to the extent practical for shipment, resulting in minimum erection man-hours and handling at the installation site.