Save Time, Save Cost . . .
Unbalance fans, blowers, compressors and other rotating process equipments due to deposit build up dirt and deposits that break off unevenly can lead to high vibration. Dismantling machine components for a workshop balancing service can be tough and time consuming. With our state-of-art instrumentation, we are capable to conduct an on-site dynamic balancing for your equipments. Many of the hidden costs can be reduced and work can be eliminated, such as:

 
In-Situ Dynamic Balancing

Our state of the art instrumentation and field experience provides us with accurate information to identify the causes of unbalance.  Our vibration analyzer identifies the amount of vibration at the rotating speed frequency.  We then measure phase (the relative motion of one part of a machine to another) to determine the location of the unbalance.  Through detailed thorough analysis we determine if the vibration is a result of unbalance.

Why we balance in the field

 

Balancing is performed on the complete assembled machine and compensates for assembly tolerances. It is often costly and time consuming to disassemble and move the rotor to a balancing machine.

 
The effects of temperature, pressure, distortion and other environmental influences can be incorporated.

 
The vibration can be adjusted for resonance or natural frequencies vs. published balance tolerances used in a balancing machine.  The unbalance may have to be adjusted to abnormally fine levels to minimize the resultant resonant structural vibration.    
What is dynamic balancing?

Identifying and correcting the mass distribution and thus minimizing the force and resultant vibration is the technique known as dynamic balancing. Research shows that a wheel and its shaft have to be in a state of balance.  The mass needs to be evenly distributed about the rotating centerline so that the resultant vibration is at a minimum.  This balance needs to be achieved first during the manufacturing process and as wear occurs so that the maximum service life can be achieved from the system.
What Causes Unbalance?




Benefits of well balanced machines

 
• Minimize noise vibration
Unbalance is the major source of machine vibration and noise
• Reduce structural stress
The forces produced by unbalance have to be absorbed the surrounding structure.
• Minimize operator fatigue and annoyance.
Exposure to vibration affects operator efficiency
• Increase machine life
The time between outages can be extended if the machine is running smoothly
• Increase bearing life
Bearings bear the brunt of unbalance forces
• Increase product quality
Minimizing vibration, especially on machine tools, produces better parts.
• Increase personnel safety
Dangers with machine failure are minimized
• Lower operating costs
Energy consumption is reduced and increase machine availability


 
Vibration acceptance standard criteria for new and rebuilt equipment  

CRITERIA FOR OVERALL CONDITION RATING (RMS OVERALL VELOCITY MM/SEC)*

  1. 1. Assuming Machine Speed = 600 to 60,000 RPM
  2. 2. Assuming Measurement by Accelerometer or Velocity Pickup securely mounted as Close as Possible to Bearing Housing.
  3. 3. Assuming Machine is Not Mounted on Vibration Isolators (for Isolated Machinery – Set Alarm 30%  - 50% Higher).
  4. 4. Set Motor Alarms the Same as that for the Particular Machine Type unless Otherwise Noted.
  5. 5. Set Alarms on Individual External Gearbox Position about 25% Higher than that for a particular Machine Type.
  6. 6. Generally, Acceptance Levels would be only about 33% of Alarm 1.
 

*NOTE: The “ALARM 1” and “ALARM 2” overall levels given above apply only to in-service machinery which has been operating for some time after initial installation and / or overhaul. They do not apply (and are not meant to serve as) Acceptance Criteria for either new or rebuilt machinery.

 

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