Water Powering the World

A major source of renewable energy, massive hydropower plants generate electricity around the world. Orkot® bearings keep turbines running smoothly, allowing the machines to operate effectively.

Orkot Hydropower

Hydropower, the generation of power from flowing water, is one of the most efficient forms of renewable energy, now providing about 16 percent of the world’s electricity.

Though today’s installations are on a huge scale, the power of water to create energy has been exploited since the time of the ancient Greeks. Kinetic energy of a flowing river has for centuries been used to turn water wheels, most commonly to grind wheat into flour.

Early hydro power
It was in the late 19th century that hydro power became a source of electricity. The first hydroelectric power plant was built at Niagara Falls, Canada, in 1879 and by 1881, street lamps in the city of Niagara Falls were powered by hydro power.

A typical hydro plant is a system with three parts: a plant where the electricity is produced; a dam that can be opened or closed to control water flow; and a reservoir where water is stored. The water behind the dam flows through an intake and pushes against blades in a turbine, causing them to turn. The turbine spins a generator to produce electricity. The amount of electricity that can be generated depends on how far the water drops and how much water moves through the system. The electricity is then transported over long-distance electric lines.

Most used composite bearing material
“One of the world’s largest hydro plants is the Three Gorges Dam on China’s Yangtze River. The biggest hydro plant in the United States is located at the Grand Coulee Dam on the Columbia River in northern Washington,” says Tom Zozokos, Product Manager Orkot® Material. “Orkot® bearings feature in both of these installations. In fact, Orkot® is the world’s most used composite bearing material by the hydropower industry.”

Orkot® is an advanced composite material, which means it has significant advantages over traditional metal bearings for hydropower applications. “Orkot® bearings are ‘fish friendly’ as they can operate in dry running applications and do not use harmful lubricants in the manufacturing process,” continues Tom. “Most metal bearings need grease to make them work properly and during operation this lubricant can enter the water. That is not very good environmentally. Orkot® material has excellent friction characteristics, meaning no grease is required. Other types of bearing materials are available, but the Orkot® product is a very cost-effective and reliable alternative.”

Continued development
Orkot® material has been manufactured since 1955, but that doesn’t mean that development does not continue.

“We’re always looking to advance our material portfolio for the hydropower industry and work with customers to meet their changing requirements. We’ve just added Orkot® C417 to our range of hydro bearing materials. This was developed for the U.S. market to be used in higher load bearing applications, while still giving customers low friction capabilities,” concludes Tom.

This article has been reproduced from in the groove, the Trelleborg Sealing Solutions magazine aimed at engineers. To read the full issue, click here .

Trelleborg to Showcase Unrivalled Low Friction Seal Material

An innovative seal material designed to accelerate performance in motorsport is to be showcased to the industry at a specialist automotive event.

Low Friction Seal Material

Turcon® M12, from Trelleborg Sealing Solutions, a polytetrafluoroethylene (PTFE) based sealing material, will be featured at Autosport International 2016 at the NEC in Birmingham.

The compound has unrivalled performance against key hydraulic sealing characteristics such as friction, wear and high-pressure operation.

Vigorously tested
It is medium-filled with a complex mix of non-abrasive mineral fibers combined with additives and has been vigorously tested, comparing it to best-in-class compounds against important sealing parameters.

The two-day automotive event, which starts on Thursday, January 14, is dedicated to exhibiting specialist technical suppliers to the motorsport and performance engineering sectors.

At this year’s show, Trelleborg’s experts will be demonstrating their pioneering sealing solutions on stand E746.

Exceeded expectations
UK Technical Manager, Andrew Longdon, said: “Before its launch, Turcon® M12 was put through its paces in the research lab, undergoing an extensive test program. Results showed that Turcon® M12 is resistant to virtually all media, including a broad range of lubricants, and has outstanding low friction characteristics and wear resistance.

“It has exceeded even our expectations, and in our opinion, no other material can give such universally exceptional performance as it provides end users with an extended seal life, as well as a wide operating window in temperature, pressure and velocity.

Best in market
“Despite the outstanding performance of many of our seal materials, we don’t often stand up and say that this is the best in market. However, Turcon® M12 is truly unrivalled and it can fit virtually all hydraulic applications.”

Trelleborg devoted a considerable amount of time to research and develop the Turcon® M12 material that is compatible with a broad range of lubricants.

Global collaboration
The material also had to demonstrate minimal wear with excellent friction characteristics at extreme temperatures, high pressures and rapid velocities.

Turcon® M12 was developed by Trelleborg Sealing Solutions in Helsingør, Denmark, and tested in the R&D labs in Stuttgart, Germany, and Fort Wayne, Indiana in the U.S.