A marine aggregates plant in Dover has recently replaced two failed screens with a single new screen from Finedoor. Owned and operated jointly by Brett Aggregates and CEMEX, the plant previously processed marine-dredged aggregates at a rate of 100 tonnes/h, but with the new screen installed the tonnage capacity at the site has been increased by 50% to 150 tonnes/h.
For the replacement Finedoor installed a 7.3m x 1.8m two-deck screen in place of one three-deck and one single-deck screen. The decision to replace the old screens with a single larger screen was based on the new screen providing equal performance and being more economical and easier to maintain.
The new screen is fitted with polyurethane modular screen panels and a spray-bar system on both decks. Finedoor have also installed a spray-bar system on the feed chute, so materials are washed before they are fed on to the screen.
Elsewhere, an electric V-belt drive and new chutework and support structures have been provided as part of the replacement programme.