SCROLL TO END FOR SOLUTIONS CVE30003 TRANSPORT ENGINEERING (RAIL ENG) - TUTORIAL 4, 2023 EXERCISE 1 MINING RAILWAY OPERATION A mining company is proposing to construct a 150km line of single-track railway (with passing loops at strategic locations) to connect a new mine to a port- based mineral processing plant where the mined ore will be upgraded prior to shipment internationally. The railway line characteristics are as follows: · Estimated output: 3 million tonnes/annum (tpa) · Ruling Grade: 1 in 100 in loaded direction 500m · Minimum horizontal radius of curve: · Maximum speed of trains: 60km/h in loaded direction 80km/h in unloaded direction . The capacity of each hopper wagons is 140 tonnes (tare + load), wagon length = 15m · Average loading time/hopper wagon (from overhead surge bin) at mine site is 4'. · Average discharge time through unloading tippler at the port is 5'. . Allow 3 hours for checking train at unloading point including refuelling locomotives . Allow 1.5 hours for checking train at the load point · The maximum length of ore trains is 1.5km. . The maximum drawbar pull on the couplings shall not exceed 15,000 tonnes gross weight. Students to define: What is the Ruling Grade? 1. Estimate the average size of ore train (including the number of ore wagons) required assuming 6 day per week operation. 2. Estimate the number of AC diesel electric locomotives that would be required to pull the loaded ore trains. 1
CVE30003 TRANSPORT ENGINEERING (RAIL ENG) - TUTORIAL 4, 2023 INFORMATION FOR STUDENTS Handling Lightweight bulk materials - Biomass and Household Waste by train EXERCISE 2 - Student Practice Question A freight railway company is planning to transport 5 million tpa of mineral sands by train from a northern Victoria mining company to the Port of Portland in western Victoria, for export. Use will be of made of an existing single-track railway line that has passing loops for trains along its length. Due to gradients along the line, the gross weight of trains (Locomotives + loaded wagons of mineral sands is not to exceed 10,000 tonnes. The locomotive and hopper wagon characteristics are as follows: · 2 x 200tonne locomotives, 23m length over couplers · Mineral sands 'bogie' hopper wagons: - Axle load: 26tonne - Wagon tare weight: 14tonne - Wagon length: 15m. With regard to train operations: Train haul length: Average line speed (loaded): Average line speed (unloaded); Average loading cycle time/wagon at mine: 4 minutes/wagon 3 minutes/wagon 4 hours Average unloading cycle time/wagon at port: Total train preparation time per round trip: 220km per direction 60km/h 80km/h 1. Estimate the number train trips required per annum to transport 5 million tpa of sands based on a 300 day per annum operation 2. Estimate the number of trains and ore wagons required for 1. above. 3. Estimate the minimum length of the passing loops required to allow trains to pass each other on the single-track railway. 4. Estimate the round trip time for a train from