575 West 800 South
Salt Lake City, Utah 84101
(801) 575-8430
Prime Machine, Inc.
Low speed Balance of Large Steam Turbine Rotors

Our custom built Balance Stand is designed so that it can be mounted to standard gauge railroad tracks.  This gives our stand a very solid, ridged and safe foundation for the balancing of very large rotors, up to 300,000lbs and almost twenty (20) feet in diameter.

 

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Low Pressure Rotor being set into our Balance stand.

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We direct couple our Hydraulic drive unit to the rotor which also controls any axial thrusting.

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The rollers on the balance stand have a large surface/contact area, this prevent any marring or marking of  the bearing journal areas.

Our Hydraulic Drive Unit is powered by a diesel engine which may be placed outside to eliminate smoke, fumes and noise from the work environment.

The Rotor is then spun up to between 150 and 200rpm.  Three runs are required to perform a balance calibration and then the final correction is made and verified.

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Operator watching the tachometer and adjusting speed.

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View of Rotor from the Turbine Deck.

This Rotor was balanced to:
.060mils @ 103° left and .026mils @ 315°


The residual imbalance was 35 oz/in in the left plane and 18 oz/in in the right plane.
The required correction weight would have been 1.447oz in the left plane
and .745oz in the right plane, on a 91,000lb rotor.

The entire Balance Unit will fit on our semi-trailer and is easily transportable anywhere within the United States and Canada.


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