DH Test Facilities
High Speed Balancing and Overspeed Test Facilities
Our DH series of high speed balancing and overspeed test facilities are designed for testing turbines,
generators and compressors at operational speeds. The Schenck measuring system CABflex3 is used
in these facilities to balance and analyze the behavior of these flexible rotors.
generators and compressors at operational speeds. The Schenck measuring system CABflex3 is used
in these facilities to balance and analyze the behavior of these flexible rotors.
Special balancing systems for shaft-elastic rotors
The result of 70 years of market leadership Schenck is the world's leading supplier of high-speed special balancing systems for balancing large power plant turbines and generators, high-speed compressors, industrial steam and gas turbines and the complex testing of engine components in the airline industry. In a constant exchange of experience with our customers, we are continuously developing our DH series.
Additional Stiffness Our DH series bearing pedestals are equipped with isotropic supported bearings, providing equal stiffness in all bearing plane radial directions. They are suitable for use at extremely high balancing and test speeds. For this purpose, the stiffness of the bearing supports can be changed through remote-control. Avoiding passing through rotor resonances, and ensuring high stability especially during over speed tests.
From engineering to service:
everything from a single source
Balancing with Schenck means: leading expertise for the entire balancing process. For the DH series, our portfolio includes system engineering, construction and turnkey delivery of your high-speed balancing and centrifugal system - including electric drive, turbo gearbox, oil supply and vacuum system and much more.
Advantages of the DH series
Customized solutions
We support you with individual solutions: from core components with bearing pedestals and measuring equipment up to turnkey facilities.
High precision
Ideal for precise balancing of turbines, compressors, generators and engine components.
Measurement of shaft vibrations
Additionally to moving coil pickups for measuring imbalances, various displacement and acceleration sensors can be used for vibration analysis, including shaft vibration and runout.
Individual installation
Schenck designs customized facility concepts based on customer needs and rotor spectra, including underground pits, movable burst chambers, overground tunnels, or bunkers.
State-of-the-art measuring software
The latest generation of our CABflex3 Measuring System for maximum flexibility and efficiency in high speed balancing processes
Versions of the DH series Maximum precision and flexibility up to a rotor weight of 350 t
DH Test Facilities
Manual
High Speed
DH
DH 2- DH 13
Our high-speed special balancing machines DH 2 to DH 13 are ideal for balancing large power plant turbines, compressors, and engine components. The isotropic bearing stands ensure high stability at maximum speeds and can be switched remotely. The latest generation of our expert system CABflex3 enables flexible analysis of your measurement data.
- Maximum rotor weight: 8 kg up to 350 t
- Maximum rotor diameter: 900 mm up to 8.000 mm
- Maximum speed: 2.300 rpm up to 50.000 rpm
Picture gallery
Worth knowing Facts and figures about the high-speed balancing and overspeed test equipment
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Technical data
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Rotor weight, min.
Rotor weight, max.
Speed, max.
Rotor diameter, max.
Size t
t
rpm
mm
DH 2 0,008
0,16
50.000
900
DH 3 0,016
0,315
40.000
900
DH 30 0,03
0,63
30.000
900
DH 4 0,06
1,25
30.000
900
DH 5 0,15
2,5
20.000
1.100
DH 50 0,25
4,5
20.000
1.300
DH 6 0,4
8
15.000
1.700
DH 7 0,6
12,5
12.000
1.700
DH 70 1
20
10.000
2.250
DH 8 1,6
32
8.000
2.800
DH 9 2,5
50
6.000
3.300
DH 90 4
80
4.500
4.000
DH 10 6,3
125
4.500
4.700
DH 11 15
200
4.500
6.000
DH 13 35
350
2.300
8.000
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Areas of application
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Suitable for: Balancing of large power plant turbines and generators, high-speed compressors, industrial steam and gas turbines as well as complex testing of engine components in the airline industry.
Main areas of application:
- High-speed balancing at operating speed
- low-speed pre-balancing
- Dynamic straightening of elastic rotors
- Strength control of spinning rotors at overspeed
- Investigations on operating bearings
- Research and development on engine components
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Special features
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Balancing and overspeed testing under vacuum conditions
Due to the high ventilation losses of bladed rotors at high speeds and the associated power and heat problems, high-speed balancing and overspeed testing takes place under vacuum with a residual pressure below 2 mbar.Burst proof containment
In order to protect the environment from the dangers of a completely or partial rotor burst, we provide different designs of DH balancing facilities:For rotor weights of up to approx. 12,5 t and 2 m in diameter, a movable vacuum chamber with integrated burst protection is recommended.
For medium and large size balancing facilities the construction of an explosion-safe tunnel or bunker is the most favorable solution.
Drive system
Schenck utilizes the most efficient and economic electrical drive system of today. This includes the capability of regenerating back into the electrical grid during deceleration. This technical solution helps our customers to protect the environment. The second important component of our drive system is the Schenck intermediate shaft which links the mechanical connection between atmospheric site of the drive and vacuum inside the tunnel where the bearing pedestals with customer rotor are located.
Oil supply and monitoring
Oil supply systems for the rotor bearings, the turbo gearbox, and the intermediate shaft are required to proper operate a high speed balancing facility. These systems supply cooling and lubrication oil for the above-mentioned components. A sophisticated emergency system provides these features even in case of loss of electrical power during operation.
All facility components can be controlled using the Schenck Process Visualization System including monitoring and data acquisition.
CABflex3
Our expert system for the efficient balancing of shaft-elastic rotors
Maximum performance for demanding requirements
CABflex3 is the latest generation of our expert system for high-speed balancing of shaft-elastic rotors such as rollers, compressors, generators, or turbines. It enables highly accurate, fast and efficient balancing of elastic rotors. The measured values are recorded and stored by CABflex as raw data to allow the greatest possible flexibility in data analysis. A wide variety of transducer types can be used. The number of channels is freely configurable.
Numerous options for precise balancing and diagnostics
CABflex3 offers you much more than just the calculation of balancing weights using the influence coefficient method: Bode and Nyquist diagrams, calculation of modal residual unbalance, runout profile, FFT analysis package, bending line, balancing optimization, prognosis, and much more. Perform analyses anywhere thanks to network capability and remote diagnosis via the Internet – ideal for flexible application scenarios and efficient maintenance.
Additional sensors for rotor inspection
In addition to the moving coil pick-ups installed in the DH series bearing pedestals for unbalance measurement, non-contacting sensors can be used to measure shaft vibration. As a result, the behavior of the rotor in the sleeve bearings can be examined. In particular, rotor deflections at certain locations can be determined, for example on overhanging shafts or in the rotor center.
Service from Schenck
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