Trash Rack
A Trash Rack is a structural steel screen installed at the intake of dams, canals, hydropower plants, and pumping stations to prevent the entry of floating debris such as leaves, branches, plastics, and other solid materials into the water passage.
It ensures uninterrupted water flow and protects downstream equipment such as gates, pumps, and turbines from damage or blockage.
Function:
- Acts as a protective barrier to stop debris from entering the intake.
- Maintains smooth water flow to spillway gates, penstocks, or turbines.
- Reduces maintenance and improves operational reliability of hydraulic systems.
Construction Details
- Generally fabricated from mild steel (IS 2062) or stainless steel (SS 304 / SS 316).
- Consists of vertical and horizontal bars welded together to form a rigid grid structure.
- Bar spacing varies depending on the type of intake and debris load — usually 30 mm to 150 mm.
- Provided with lifting hooks or frames for easy installation and removal.
Types of Trash Racks
- Fixed Type: Permanently installed and cleaned manually or mechanically.
- Removable Type: Can be lifted using hoists or cranes for cleaning or maintenance.
- Automatic / Mechanically Cleaned Type: Equipped with raking mechanisms for continuous operation.
Coating and Protection
- Surfaces are coated with epoxy primer paint for corrosion resistance.
Advantages
- Protects turbines, pumps, and gates from damage.
- Reduces downtime due to clogging.
- Enhances water flow efficiency.
- Ensures safe and reliable plant operation.
Applications
- Hydropower intake structures
- Canal and irrigation systems
- Water treatment plants
- Dams, reservoirs, and pump houses
