ROTO – SIEVE DRUM SCREEN With high operational reliability, a long service life and low energy consumption, Roto-Sieve drum screens are a proven good investment. Due to its internal feed and circular perforations, Roto-Sieve offers the best separation that can be achieved mechanically. It has been shown in practice that a fibre or hair has a very small chance of orienting itself at a right angle and against the water current, so that it can pass through a round hole. Technical features • • • • Low energy consumption High degree of separation High operational reliability Good utility in many applications Process benefits • Enhances processes, for instance in treatment works • Reduces need for cleaning • Makes servicing easier • Reduces running costs of subsequent stages The diagram shows a circular hole with Ø 1.0 mm on an internally-fed Roto-Sieve drum screen, compared with a 0.5 mm opening along the drum’s rotating direction on an exte

Function Roto-Sieve drum screens consist of a perforated drum (1) with internally fixed screw (2), which transports the separated particles out of the drum. The drum rotates by drive belts (3) and is driven by a cog gear motor (4). Incoming liquid is fed into the drum through an inlet pipe (5), which distributes the water over a large area of the drum’s interior. During passage through the drum, the liquid is screened through the drum’s perforations and collects in the trough (6) underneath. Separated particles are transported out of the drum through the screenings outlet (7). Dewatering continues...

Tecnical data drum screen, model Capacity 1) Transport volume, incl. crate Gross weight Inlet pipe Outlet pipe Overflow outlet pipe Drum rotation Spray header connection Spray water pressure Spray water consumption Drum inclanation, standard Drive motor - rated power Drive motor - rated current (230/400V) 1) Wastewater with a SS-load of 200 ppm and Ø 2.0 mm perforations. Flow speed reducer is recommended at high capacities. 2) Static weight with drum filled to the overflow level. 3) Sized for unrestricted gravity discharge. Stainless steel Acid-proof steel Stainless steel Drum screen Inlet pipe...

Design As standard, Roto-Sieve drum screens are manufactured in five models for various flows, in stainless steel or acid-proof steel. For all models, splash guards are made in stainless steel covers. Brushes are manufactured in heat resistant material. Standard drum perforations are 0.8-1.0-1.5–2.0-3.0 mm and the smallest perforations are 0.6 mm. Most models are supplied with overflow systems as standard. Roto-Sieve Drum Screen, model 11 Roto-Sieve Drum Screen, model 22 Roto-Sieve Drum Screen, model 24 Roto-Sieve drum screens, model RS-51, installed at Kullavik treatment works in Kungsbacka....