Atlas Copco’s new FlexiROC T45 drill rig, introduced at this year at the Bauma fair in Germany, is considerably less “thirsty” and overall more efficient than its predecessor, the ROC F9. That’s the conclusion at the open cast Svappavaara mine in the far north of Sweden, which is owned and operated by LKAB, one of the world’s largest mining companies.
During tests at the mine, the rig, equipped with the COP 2560 rock drill, logged 500 impact hours, 200 hammer hours and a total of 12 500 drillmeters. It was used to drill 89 mm holes to an average depth of 15 m, mostly in iron-rich rock.
Atlas Copco Service Technician Patrik Lindqvist says: “The biggest advantage with the FlexiROC T45 is undoubtedly the fuel consumption. With its Tier 4 engine and exhaust purification system, it used 20.5 liters of diesel per hour, compared to 35 liters for the ROC F9. That’s a big reduction in operational cost as well as CO2 emissions.”
Air on demand
Lindqvist explains that the FlexiROC T45 operates on demand. “The operator tells it how much air is required for the compressor and that’s exactly the amount of air he gets. Previously, a full air load was always delivered which meant that a lot of diesel was being used as the rig had to be run at a higher rpm. It was the same with hydraulics. However, with the new rig, you simply get the amount of pressure you ask for. There’s no waste and you save fuel.”
More room for service
The FlexiROC T45 has a service-friendly engine compartment and the hydraulic system is completely new, requiring 50% fewer hoses and 70% fewer couplings.
“Among other things, we’ve moved the hydraulic valve out to the feed, which reduces the need for hoses,” continues Lindqvist. “We’ve even made the hydraulic tank much smaller which gives more room in the cab and more room in the engine compartment to carry out daily servicing.”
Big changes have also taken place in the cabin thanks to improved ergonomics. For example, there are fewer buttons and just two joysticks instead of five.
Peter Olingemar, who operated the rig during the test, says: “The FlexiROC T45 is much easier to operate. Most of all, I like the environment in the cabin and the new chair. The difference is that I feel a lot more relaxed at the end of the workday.
“In addition, the engine usually runs at about 1 200 rpm and can go down to 600 rpm when you’re tramming. So both comfort and noise levels are much improved.”
Leif Kemi, Production Manager at the Svappavaara mine, comments: “When Atlas Copco asked us if we were interested in testing a new model of drill rig we said yes right away. We knew this rig would have a lot of new solutions including joysticks, engine and so on, which would lead to improvements.
“I didn’t drive the rig myself but I was present the whole time. When we later discussed it with the operators most of them were very impressed by its maneuverability, low noise cabin environment and of course the low fuel consumption. That’s how I experienced the rig too, especially when it comes to the energy consumption. We can certainly imagine the FlexiROC as a suitable replacement for our current rigs.”
Engine hours: 500
Impact hours: 200
Meters drilled: 12 500
Hole diameter: 89 mm
Average depth: 15 meters in iron-rich rock
Fuel consumption: 20.5 l/h
Engine RPM: During drilling 1 200, during tramming 600, during idle 900
Epiroc operated under the trademark “Atlas Copco” prior to January 1, 2018.