Centrally driven clarifiers thickeners:avighna claritec offers full half structural bridges cum walkway and hand rails spanning over the outer diameter of the tank. Features of centrally driven clarifiers thickenerscentre cage (feed well) is suspended into the tank. The diameter of the centre cage is determined according to the diameter of the tank.rake arm mechanism and drives are supported by structural bridge. drive mechanism is selected according to the application and torque required.drive arrangement is comprised of:1. drive (act-dh act-s) mechanism2. worm reducer (make: as per client requirement)3. chain drive with guard4. motor (make: as per client requirement)drives are normally selected to achieve a rake arm tip speed of 2.5 m min, or as requested by the client. drive head powers a vertical centre shaft carrying the rake arms.the settled solids are scrapped by means of a rake arm (scraper) through the central sludge pocket and clear overflow is collected in a peripheral launder.in thickeners, picket fences are provided along with the rake arm. optional features provided by avighna claritecsurface skimmer.v notch weir plate and scum baffle.manual motor driven lifting device for rake arm.overload protection by means of mechanical electro-mechanical overload devices. shear pin arrangement.telescopic sludge discharge valve.lifting device unit