For over 200 years, members of the Collen family have been involved in the construction industry. One of the family’s main business interests is Glebe Hill Quarry, in County Armagh. This site produces 250,000 tonnes of high PSV gritstone per annum of which 40,000 tonnes per year passes their own asphalt plant.
Collen Bros (Quarries) Ltd approached independent supplier of replacement screens, North Dean Engineering Ltd, with issues on their existing Niagara asphalt screen. The Niagara was experiencing short bearing life and a cracking side plates, of which Collen Bros had repaired themselves.
Following a visit and detailed site survey, North Dean tendered for the supply of a new 3.4M x 1.5M – 3 Full and 2 Half Deck to replace the Niagara 4tr9 Screen.
After successfully winning the tender, North Dean based their new design on the original footprint of the old screen. This meant that no modifications to the material inlets or to existing bin configurations was required. The only new supply was for a new front chute, this was due to the screens new deck configuration which allows for easier media change, as the old Niagara screen mesh changes caused a lengthy down time to the plants availability for production. The new 3.4M x 1.5M 3 Full and 2 Half Deck Vibrating Screen was supplied with a new high temperature oil bath shaft assembly. This enables the machine to cope with the high temperatures encountered in the production of asphalt.
Mr Andrew Collen of Collen Bros (Quarries) Ltd commented: ‘North Dean undertook the total redesign of our screen, especially the deck configurations to allow for an easier change of media, to fit the footprint of our existing screen. North Dean supplied us with a quality product which was installed in just one weekend to reduce down time on the plant. The successful installation meant the plant was back up and running on Monday morning.’