Extra Costs Recovered
Although the initial capital cost of civil works, including a concrete chamber for each screen, may be higher than for a travelling band screen, the large flows handled and the low maintenance requirements mean that the extra cost can be recovered within 3-4 years, depending on local conditions.

Applications include the main cooling water intakes of power stations, refineries and petro-chemical plants using fresh or sea water. The screens can also be used at the intakes to desalination and water treatment plants.

Robust construction
The Brackett Green Double Entry Drum Screen consists of a robustly constructed drum with a solid horizontal centre shaft which revolves slowly in heavy duty self-aligning double roller bearings. These are lubricated from deck-level oil reservoirs.

Water flows from the inside to the outside of the drum through mesh panels arranged around its periphery. These mesh panels are cleaned, with the assistance of gravity, by backwashing at deck level.

The screen is driven by a simple drive unit positioned at deck level, the final drive being by a nylon pinion which engages with a gear ring on the outside of the drum. The only moving parts are the drive gear and the main shaft assembly.

Purpose Designed
Brackett Double Entry Drum Screens are purpose-designed for each individual intake, with specific features as necessary to suit the particular operating and site conditions.

Screens of this design have been built by Brackett Green to diameters exceeding 20 metres and widths up to 5 metres.

Ancillary Equipment
All the plant needed for a complete screening station can be supplied by Brackett Green.