Cup and Drum Screens
Cup and Drum Screens for Pump, Condenser, and Treatment Protection
WTR® Cup and Drum Screens are a cost-effective means for fine screening of raw water. They are used in all types of applications where continuous screening is required and protection of downstream equipment is essential, including power plant raw water intakes (fossil and nuclear), industrial raw water, potable drinking water, irrigation, and numerous other types of plants.
Debris in the flow can overwhelm and damage rotating screens, cause serious condenser issues, or interrupt a water treatment process. Review of the source water is critical to the proper selection of the flow pattern, mesh aperture, rotating speeds, and materials of construction. WTR’s extensive knowledge base can greatly aid in determining the most suitable of these, along with offering alternatives and options beneficial to the design.
WTR Cup and Drum Screens are designed to automatically and reliably filter influent water and discharge recovered debris or marine life into the appropriate handling trough. Screens can be designed to handle typical water-borne debris as well as unusual grasses, seaweed, jellyfish, and many different types of debris.
The screens are available in various flow patterns including single entry cup (SEC) or double entry drum (DED).
To eliminate debris carry-over, the center flow pattern is recommended for total separation of influent from effluent. The SEC and DED are both center flow screens where the influent enters the center of the screen. Filtration is carried out by the rotation of the cup or drum and debris carry-over is completely eliminated.
Both flow patterns are available as fish recovery and return to meet environmental requirements. Specialized water-tight, hydraulically-stabilized fish recovery buckets allow for the quick recovery of juvenile marine life. Organisms are elevated to deck level where gentle sluice sprays aid in discharging them into a return trough for reinsertion to their indigenous environment.
After the fish sprays, the screen continues rotating past higher pressure debris sprays, washing the captured screenings into a separate debris trough for discharge or further disposal.
WTR Engineering, LLC, is a wholly owned subsidiary of WesTech Engineering, as of April 1, 2017. WTR designs and supplies mechanical water filtration equipment, such as raw water and wastewater screening for large flows, for both the municipal and industrial markets, including the power industry.
Benefits and Features
- Screens are built to specific conditions for flow, mesh aperture, panel style, and debris or marine handling
- Frame materials of mainly carbon steel (epoxy coated) or stainless steel (304L, 316L, Duplex or other)
- Main structure end seals of neoprene and UHMW prevent bypassing of debris larger than the mesh aperture
- Variable Frequency Drive (VFD) motors incorporate multiple speeds to provide flexibility during varying flow conditions
- Shaft-mounted drives reduce maintenance and eliminate drive sprockets, chains, and chain guards
- Dual spray headers provide positive overlapping coverage and reduce pressure and volume for cleaning
- Main shafts utilize anti-friction bearings for reliable, continuous operation, and reduction in maintenance requirements
- Single entry cup (SEC) or double entry drum (DED) flow pattern
- Fish recovery and return to meet 316(b) for either flow pattern
- Control systems with ultrasonic or radar differential control
- HMI touchscreen control or DCS monitoring
- Complete elimination of carry-over with separation of influent from effluent
- Extremely reliable operating performance due to simplified circular structure
- Low maintenance with no permanent rotating components below water level
- Extended debris elevators handle oversized or unusually shaped debris
- No drive chains, carrier chains, chain tracks or submerged sprockets to maintain
- High strength components for continuous (24/7/365) operation
- Positive sealing via flexible seals replaceable at deck level
- High impact spray nozzles for debris removal
- Power plant raw water (fossil and nuclear)
- Petroleum refineries
- Chemical plants
- Industrial raw water (pulp and paper, steel mills, etc.)
- Potable water intakes
- Irrigation for water distribution
- Domestic sewage treatment plants
- Water parks