The Brackett Green® Single Entry Cup Screen and Double Entry Drum Screens are designed to meet increasing requirements of fine screening necessary with today’s competitive performance parameters. Brackett Green’s Cup Screens & Drum Screens have proven to be reliable and highly efficient on new installations at the water inlets to power stations, chemical & petrochemical as well as desalination plants. Cup Screens & Drum Screens utilize the in-to-out, central flow pattern that totally eliminates the possibility of material larger than the media aperture from bypassing the screen. Single Entry Cup Screens and Double Entry Drum Screens are ideal for the protection of debris sensitive processes such as condensers, heat exchangers, and membranes.

A variety of different screen flow patterns and mechanical designs have been applied to the inlets of power and petrochemical plants over the past century. Each type of screen came with numerous inherent flaws which prevented efficient screening, required constant maintenance or needed multiple screens, civil channels, and/or redundant equipment and services. Brackett Green’s Cup Screen & Drum Screens are highly suited for the fine screening of large flows, replacing multiple parallel operating band screens, civil channels and ancillary solids handling equipment with a single channel and fine screening system. The thru flow traveling band screens filter debris perpendicular to flow. The screenings are lifted and washed by a high pressure spray. Any solids that have not been removed from the screens will “carry over” into the clean water side of the channel, dislodge and contaminate down stream equipment and operations within the plant, thus greatly decreasing plant efficiency.

Brackett Green’s engineers have spent decades improving screening designs and complimentary screening media for the fine filtration of raw water and wastewater. The single entry cup screens and double entry drum screens have eliminated the necessity for multiple thru flow band screens, providing a single system capable of screening flow rates of 5,000 to 700,000 GPM. Each screen consists of a robustly constructed frame with a solid horizontal shaft which revolves slowly in heavy duty self-aligning double roller bearings, lubricated from deck-level reservoirs. Water flows from the inside to the outside of the drum through mesh panels arranged around its periphery. The 0.5 mm to 10.0 mm mesh panels are cleaned with the assistance of gravity by backwashing at deck level. The screen is driven by a direct motor drive unit positioned at deck level and connected to a pinion which engages a gear ring on the outside of the frame. The only moving parts are the drive gear and main shaft assembly ensuring maximum efficiency, low maintenance and minimal operator attendance. Brackett’s Single Entry Cup & Double Entry Drum Screens are ideal for installation on large volume raw water intakes. Applications include the main cooling water intakes of power stations, refineries and petrochemical plants using fresh or sea water as well as intakes to desalination and/or potable water treatment plants.

Other Features

High strength frame, (8) shaft and (9) automatically lubricated anti friction bearing (10) provide for trouble free operation. Platforms (11) allow instant access to spray nozzles and mesh panels. Positive sealing between the rotating screen structure and chamber wall is provided by the patented Brackett Green Contact Seal (Patent No. 0026.661). This is a preformed neoprene seal, fitted to the screen (12) and running in contact with a low friction sealing face fixed to the chamber wall (13). Screen rotation is by a drive pinion (4) working with a cast iron or nylon rack (14).