Pumps for Varying Water Volumes in Hydroelectric Power Plants

How to benefit from using a multi screw pump for hydraulics and lubrication

The demand for alternative energy sources such as hydropower is steadily increasing. But uneven water flows pose significant challenges for man and machine worldwide. In particular, the pumps for the hydraulics and lubrication of the turbines in hydroelectric power plants, which weigh several tonnes, quickly reach their limits.

As a global specialist in complex fluid management, NETZSCH Pumps & Systems offers you the optimal pumping solution for the hydraulics and lubrication of turbines. We will show you how you can benefit from using a NOTOS® multi screw pump.

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Hydroelectric Power Station, NETZSCH, Pumps, Systems

Hydraulic and lubricating oil pump prevents unplanned downtime 

The electricity is generated in the hydropower plants with turbines. The country's most giant Kaplan turbines are running at the Estreito plant on the Rio Tocantins in Brazil. Their rotor alone weighs 470 tonnes. However, since the water quantities are not constantly the same, the amount of lubricant needed for the turbines also changes continuously. Here it is essential to react quickly and flexibly with the hydropower plant's hydraulic and lubricating oil pumps. This is the only way to prevent uneven wear and to overheat the turbine support and guide bearings of your generators. With the right pump, unplanned downtimes and increased maintenance and service costs are a thing of the past. In Estreito, innovative lubrication systems from NETZSCH are therefore used that are individually adapted to the requirements of the hydroelectric power plant.

Varying water quantities: With this oil pump, you remain flexible

The lubrication systems that meet these requirements include hydraulic and lubricating oil pumps, filters, heat exchangers, instruments, controls and lines. They are composed of two essential subsections, an injection unit and the actual lubricating oil circulation. Due to the enormous weight of the turbines resting on the bearings, the lubricant must be introduced at very high pressure, especially during start-up and shut-down. This ensures that a sliding film is created between the rotating and static components and prevents possible damage. The continuous lubricant supply and the return for cooling and filtration are handled by unique NOTOS® 4NS geared twin screw pumps. These pumps are not only used for bearing lubrication but also for turbine speed control. Permanent adaptation to a wide range of conditions is essential here. This allows you to react quickly to changing conditions and prevent spinning when the torque on the generator shaft drops. 


tonnes weighs only one rotor

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Self-priming NOTOS® 4NS geared twin screw pumps convince by high flow with minimal turbulence without metal-to-metal contact of the screws.

Increase service life with innovative pump for hydraulic and lubricating oil

The NOTOS® multi screw pumps used to lubricate and control the hydraulics can generate exceptionally high pressure. This enables you to control the turbines, which weigh several tonnes hydraulically. The pumps consist of two spindle-shaped rotors whose sinuous profiling matches each other and the housing geometry. As a result, the screws interlock when they rotate, and sealed delivery chambers are formed in which the medium is conveyed from the suction to the discharge side. The flow rate is determined mainly by the helix's pitch, the spindles' diameter and the shape of the spindle profile.

Due to the hydraulic thrust compensation of the lube oil pump, the axial forces approach zero even for high pressures. The innovative pump design offers you long service lives despite high pressures. This is ensured, among other things, by an integrated spring-loaded overflow valve that protects the system from overload. To maximise the resistance of the hydraulic and lubricating oil pump over its entire life cycle, NETZSCH uses hardened nitrided steel for the spindles and cast iron for the housing. In addition, the exact adjustment of the interaction of the spindles is permanently guaranteed by special bronze bushings. Using a NOTOS® 4NS geared twin screw pump significantly increases your service life. In addition, you prevent unplanned downtimes caused by problems with your hydropower plant's lubrication and hydraulic oil supply.

NOTOS® 4NS geared twin screw pump

  • Pressure: 68 bar
  • Medium: Hydraulic and lubricating oil
NOTOS® 4NS Geared Twin Screw Pump, NETZSCH, Pumps, Systems