The Bottom Dumper (BD) is suitable for pellets, rock and other easily unloaded commodities and is designed for high-capacity continuous bottom discharge.
Fast loading and unloading are key features of the BD wagon, which is an 8-axle wagon made up of a master wagon and a slave wagon. The bottom of the wagon consists of two large hatches that open entirely during discharge. Emphasis has been placed on the angle of repose, to optimise the centre of gravity and achieve a complete emptying. The wagon is designed for rolling discharge and has a discharge capacity of up to 20,000 tonnes per hour.
The solution and its components are tested and proven in a demanding subarctic climate; the BD wagon is currently in traffic in the Arctic regions of Sweden and Norway. The BD unloading station is a low-cost solution designed to provide a reliable service in temperatures ranging from −40 to +60 °C.
Construction and materials
The construction is a remarkable combination of robust bottom door function and low tare, based on more than 100 years of experience in rail ore transport and steel refinement. By using ultra high-strength hot-rolled steel with a lowest yield point of 650 MPa in the body we have minimised the tare weight and developed a more efficient and environmentally friendly ore transport. The wagon body is built like a boat hull where a supporting frame distributes the forces downward from the load to the chassis. Advanced techniques, such as laser hybrid welding and laser cutting, have been used in the manufacturing process to produce durable seams and minimise the heat effects on the steel.
The Bottom Dumper has a modular design which means that damaged parts can be quickly replaced. A goal of our maintenance concept is that two people should be able to exchange any of the wagon components within two hours, with exception for the chassis.