Durst Supplies Turning Gear for Nuclear Power Plant
The Durst division of Regal Beloit Corporation has shipped its second model TG 80/125 turbine turning gear as part of the ongoing expansion of the Kori nuclear power plant in Gori, South Korea. The TG 80/125 will be installed at the Shin-Kori 2 nuclear reactor, the second unit in a four-reactor construction project launched in 2006. Durst shipped the first TG 80/125 in May 2011, for installation at the Shin-Kori 1 reactor. The Kori nuclear power plant is owned and operated by KEPCO. The Nuclear Power Plants Business Group of Doosan Heavy Industries and Construction, Korea's only major nuclear equipment supplier, is collaborating with General Electric on the multi-reactor project.
Designed to fit between the General Electric steam turbine and the Doosan steam generator, the TG 80/125 is used to start up turbines to achieve the required speed. The turning gear is engaged when there is no steam to the turbine. It rotates the turbine at 3.5 rpm, ensuring even heating to prevent uneven expansion. Once the required speed is reached, the turning gear is disengaged and steam is admitted to the turbine - a process that takes approximately 20 seconds.
Durst manufactures 14 model sizes in its turning gear line, from 2 hp up to 100 hp. At nearly 9 tons, the TG 80/125 measures 7 feet long x 6 feet high x 5 feet wide, making it the largest turning gear in the world. The 80/125 designation refers to the turning gear's capacity, indicating a range of 80,000 to 125,000 pounds of breakaway tooth load at the clash pinion interface with the turbine rotor gear.
When the turbine is shut down for maintenance, the TG 80/125 is engaged at 3.5 rpm with the turbine gear. The turning gear rotates the turbine at 3.5 rpm for up to two weeks as the turbine cools down to room temperature. This evens out the temperature distribution around the turbine and prevents warping of the turbine blades and damage to the Babbitt bearings.
Durst recently incorporated design refinements into the TG 80/125, including a new mounting configuration for the torque motor. The new-generation TG 80/125 is driven by a 75 hp main motor and a 1.5 hp torque motor from Marathon Electric, a Regal Beloit company.
Previously, the torque motor was mounted to the main housing. It utilized chains and sprockets to take up all the backlash within the gear meshes. The new design has the torque motor mounted piggyback in relationship to the main motor. The torque motor takes up the gear mesh backlash, and then the main motor takes over the load.
1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
BRIEF INTRODUCTION
Cnbearing is the No.1 bearing inquiry system and information service in China, dedicated to helping all bearing users and sellers throughout the world.
Cnbearing is supported by China National Bearing Industry Association, whose operation online is charged by China Bearing Unisun Tech. Co., Ltd.
China Bearing Unisun Tech. Co., Ltd owns all the rights. Since 2000, over 3,000 companies have been registered and enjoyed the company' s complete skillful service, which ranking many aspects in bearing industry at home and abroad with the most authority practical devices in China.
