TRASH RACKS SCREENS GRATES
What are Trash Racks Screens Grates and Guards
Trash Racks Screens Grates and Guards are metal structures installed in front of the water intake systems of hydroelectric power plants, Pumping Stations, Water Treatment Plants and Irrigation Systems to protect equipment, avoid clogging and blockage and prevent the entrance of large debris which might damage turbine parts and obstruct the plant operations.
Trash Racks Screens Grates and Guards are designed to prevent floating and submerged trash, garbage and debris from entering Dams, Reservoirs, storm water and waste water systems while maintaining water flow. Typical applications include storm Water Retention and Management Facilities, Dams, Wastewater Treatment and Industrial Facilities. VALINOR provide a wide range of standard trash rack sizes and designs fabricated from Stainless Steel, Galvanized Carbon Steel, Cast Iron and Aluminum. Custom Fabrication Trash Racks may be fabricated to meet your project-specific requirements.
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Types of Trash Racks
Trash racks are classified into three types based on their constructional features and the methods of installation:
A. Removable Racks
The racks installed between side guides or grooves are provided in the trash rack structure so that they can be easily removed by lifting them from guides. Type A racks shall be used for all major trash rack installations where a portion of the rack is deeply submerged.
B. Removable Racks
In this type, the individual sections are placed adjacent to each other laterally and in an inclined plane to obtain the desired flow area. The rack section is secured in place with bolts located above the waterline for easy removal.
Type B racks shall be used for canal head works and pumping plants where a single rack section extends from the water surface to the bottom of the rack.
C. Fixed Racks
In fixed racks, the rack sections are bolted in place below the waterline. Type C racks shall be used with power-driven cleaning rakes that are required for cleaning them. These types of racks are commonly used for intakes that are submerged.
The selection of the type of trash racks depends upon the following parameters:
- Accessibility for maintenance or replacement
- Size and quantity of trash expected
- Mechanism available for raking.
Inclination of Trash Racks
- The trash racks must be installed in slanting positions except for guided racks, which can be installed in a vertical position.
- For manual cleaning of the racks, the slope should be 1 vertical to 1/3 or 1/2 horizontal.
- For mechanically cleaned racks, the slope shall be 10° to 15° with the vertical.