Prime Field Service Millwrights highly skilled in dynamic balancing large rotors with precision

Prime Field Service Dynamic balancing services for your rotating equipment.


Prime Field Service dynamic balancing have world-class capabilities for balancing large rotors, offering services both on-site and in their workshop. Their millwright craftsmen are not only equipped with the latest technology for vibration analysis and dynamic balancing but are also thoroughly trained in these techniques. The company emphasizes the importance of dynamic balance for rotating equipment, underscoring its critical role in operational efficiency and smooth running.

Our proficiency in handling both small and large rotors, is underlined by our daily practice and expertise in this area. An invitation to view our dynamic balancing process is extended through this video, showcasing our versatile balancing machines capable of operating in both soft bearing and hard bearing modes.

Safety and certification are paramount, with the team trained and certified in MSHA, OSHA, and UTIC safety standards, reflecting their commitment to maintaining a safe working environment. Their EMOD rating, which is below 1, signifies exceptional performance in worker safety and insurance costs, further establishing their credibility and over 35 years of industry service.

Prime Field Service Dynamic Balancing is capable of diagnosing and correcting vibration problems, whether through dynamic balancing, bearing replacement, correct alignment, or other necessary adjustments. Our comprehensive approach not only identifies the issues but also provides the requisite repairs or engineering solutions.

For businesses experiencing issues with rotating equipment, from large turbine rotors to small air handlers, our service offers a solution to vibration problems, ensuring equipment runs smoothly and efficiently. They encourage potential clients to reach out for assistance with dynamic balancing needs, highlighting their readiness to provide necessary adjustments, repairs, or engineering solutions.

Millwrights are dynamically balancing large fan 2 planes.

This large balancing machine may used either as a soft bearing balancing machine or locked in and used as hard bearing machine if starting unbalance is large.

Prime millwrights dynamic balance of large fan – precision two plane balance of fan rotor in our balancing machine

Repair maintenance of small hydro electric plant required balance of the rotor.

Dynamic two plane balance of small hydro-electric turbine rotor

Dynamic two plane balance of small hydro-electric turbine rotor by welding weights to the rotor.  The dynamic balance was completed in overhung position.

Millwrights checking vibration signatures to determine corrective action to eliminate vibrations

Complete balancing service measure out of balance deter

Dynamically balancing large fan in field is an every day task for Prime Field Service. Measuring the out balance condition calculating need weights and welding them in correct position to correct out of balance condition.

Machine maintenance of rotary screw compressor rotor requiring dynamic balance completed by Prime Field Service millwrights

Prime millwright dynamically balancing compressor rotor 2 plane dynamic balance method.

Rotary screw dynamically balanced in two planes.  Balancing of rotors was part of the complete rebuild of compressor.

Prime Service millwrights completing the turbine rotor maintenance by dynamically balancing the rotor to precision requirements.

turbine rotor dynamic balanced

Dynamic balance of steam turbine rotor. Prime repaired rotor with new shaft and assembled all stages of rotor o new shaft.

Large low pressure steam turbine rotor being set into our Balance stand for our balancing millwright team to dynamically balance.

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

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 200 rpm.  Three runs are required to perform a balance calibration and then the final correction is made and verified.

Operator watching the tachometer and adjusting speed.

Large turbine rotor 2 plane dynamically balanced by the Prime Field Service millwright crews.

Large low pressure Steam turbine rotor being balanced on site in the turbine bay by Prime Field Service millwright crew. 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.

Maintenance benefits of having your rotating equipment dynamically balanced.

Often there are issues with vibration, stress, or life expectancy of machinery that relate directly to the balancing of rotating equipment. Prime Field Service has the capability to detect, monitor, and correct these issues, both in-house and on-site.

Balance is an especially sensitive issue in high-speed or precision equipment. It affects production rate and quality of product, as well as the lifespan of the equipment.  It has been documented by many large processing and production industries, that the money saved by longer equipment life and lowered maintenance costs, can drastically increase profits, product quality and customer satisfaction. Prime Field Service also has a full condition monitoring program, that can be custom tailored to your facility. See our Predictive Maintenance Page.

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 300,000 pounds and almost twenty (20) feet in diameter.