Trash Racks

The screen is typically installed in a pumping station or at the inlet of sewage or water treatment plants. The retained solids are then extracted by means of a cable driven manual raking system which lifts the solids outside the channel and discharges into a hopper.

To prevent material too coarse from reaching the travelling band screens, bar screens may be used in two stages where the first screen with wider bar spacing remove bulky solids; a second bar screen with smaller bar spacing then remove debris still coarse enough to clog travelling band screens installed downstream for finer screening.

Filtration at the first stage of sewage water intake system is done by variety of Bar screens.

Bar screens can be categorized according to various properties:

1. Removable Type: Screen can be removed & replaced from

Frame.

2. Fixed Type: Screen is fixed to the channel or opening. This

cannot be removed.

1. Curved/ Hyperbolic Fine screen 2. Flat Fine Screen

1. Fine Screens- Generally distance between two bars is

2. Medium Screen- Generally distance between two bars is 3. Coarse Screen- Generally distance between two bars is

1. Wedge Type Bar Screen: Easy to clean & lesser maintenance

2. Straight/ Flat type Bar scren