Dooen Engineering Services | Materials and Grain Handling Equipment Dooen Engineering Services manufacture bulk material and grain handling equipment. We manufacture equipment and machinery for the bulk grain storage companies across Australia. We primarily manufacture bunker equipment up to 700 tonne per hour capacity. Our most sort after product in this industry is the 700tph open trough stacker conveyor and 600tph auger output drive-over ... Customers: Emerald Grain, GrainFlow, Broadbent Grain