ProLTTE group to protest during President Sirisenas UN visit

A pro-LTTE group said it will protest during President Maithripala Sirisena’s visit to the UN in New York this week.The Transnational Government of Tamil Eelam (TGTE) said it will hold a protest against President Sirisens’s visit to the UN to speak at the UN General Assembly. TGTE said it was during his time that Sri Lanka rejected appeals by world leaders to stop shelling and bombing an area called “No Fire Zone”, which was created by the Sri Lankan Government, where thousands of Tamil civilians assembled for safety. (Colombo Gazette) The protesters will highlight the Sri Lankan President Sirisena’s alleged role in the killing of Tamils and rape of Tamil women by Sri Lankan Security forces under his command, when he was serving as the acting defense minister during the final weeks of the war. read more

Sandvik RockPulse offers first realtime tool stress monitoring in top hammer drilling

first_imgRockPulse™, a new technology and product introduced by Sandvik Mining and Rock Technology, is the first practical solution for real-time tool stress monitoring in top-hammer drilling. The add-on system integrates directly with the rock drill and its control system, and can be used for drilling process optimisation in varying rock conditions. This also helps to reduce the stress fatigue of drilling tools. RockPulse™ offers significant potential to improve overall drilling performance, by as much as 5%.Profitable rock drilling requires balancing between drilling power and cost-efficiency. While use of high drilling power is required for good performance, excessive power becomes counterproductive due to high stress levels and wear of drilling tools. Optimisation of tool stress and consequently tool lifetime are essential for cost-efficient drilling operations. Conventional drilling control technologies have done this based on indirect performance indicators only, such as percussion or feed pressures.RockPulse™ analyses each piston blow in real time to extract data on the tool stress. This enables operators to optimise drilling power and to minimise inefficient use of percussion energy. Stress waves created by piston strikes are measured continuously using sensor technology developed and patented by Sandvik. The system consists of a Sandvik shank adapter and rugged contactless sensor inside the rock drill. Stress wave signals captured by the sensor are analysed within the Sandvik SICA control system of drill rig. The system is available for new Ranger DXi drill rigs and RD920 series rockdrills.“Our tests from real-life conditions show 5% increase in average penetration rate, even though the percussion power was decreased by 4%. Drill operators have additionally commented that RockPulse™ helps them to optimise bit regrinding intervals and thus boost efficiency and productivity,” says Jarno Viitaniemi, Product Manager, Surface Drilling, Sandvik Mining and Rock Technology.The RockPulse™ user interface visualises and alerts on three key parameters: drill bit response, tool load and feed level. Drill bit response helps to minimise the strain on the tools by indicating how much of the impact energy is used for breaking rock and how much is reflected back to the tool string. Tool load indicator shows the tensile stresses affecting on the tool string, which helps to avoid underfeed in weak rock and excessive wear of drilling tools. Feed level indication shows whether drilling is being done within the specified feed range – a key parameter for excellent hole quality and long tool life.“I realise this is a bold statement, but we believe RockPulse™ is a truly groundbreaking solution that marks the beginning of a new era in top-hammer drilling,” concludes Viitaniemi.last_img read more