Causes of Unbalance
Material problems such as density, porosity, voids and blowholes can contribute to the unbalance condition. Fabrication problems such as misshapen castings, eccentric machining and poor assembly.
Distortional problems such as rotational stresses, aerodynamics and temperature changes Corrosion, Wear, Distortion.
Deposit build up dirt and deposits can break off unevenly, which can lead to severe unbalance, this especially applies to fans, blowers, compressors and other rotating equipment process variable.
Rotors that operate within 70%-75% of a critical speed are considered flexible rotors. Rotors that operate below that speed are considered rigid. Many times rotors are balanced at the factory for a rigid condition using a low speed balancing machine, but when the get put into service they become flexible rotors. These flexible rotors require a multi plane balancing procedure.
When unbalance has been identified, the correction is straight forward weight has to be added or removed from the rotating element. The goal is to reduce the uneven mass distribution so that centrifugal forces and vibrations induced in the supporting structures are at an acceptable level.
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.
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 Analysis & Field Balancing
Amc In Vibration Consultancy Services :
It helps every company in reducing breakdowns of their machines & equipments up to minimum level.All the Equipments remain healthy through our regular checkup by condition monitoring tool and gives the maximum functioning output from each equipment.We as a company are engaged in offering AMC Consultancy services to our clients. The services are planned and executed by a team of well qualified experts, who have gained years of experience in this respective domain of client servicing. These people follow the procedures and processes as per the detailing of the experts working with us. While offering these services we lay down emphasis on the pricing factor as well as the suggestions and specifications of the client.
Amc Consultancy Features
* Reduces wear & tear of machine parts
* Increase in Bearing Life
* Zero Percentage Maintenance
* Maintains zero breakdowns of production machines
* Machines remains healthy
* Reduces loose connections due to vibration of control panels
* Executed in the guidance/supervision of experts
Vibration Analysis :
We are ahead among our competitors in offering outstanding services of Condition Checking. These services are rendered with perfection using best available technologies. All our professionals hold rich industry experience in the concerned domain ensuring almost result. Besides, understanding the estimated budget of our clients, we offer these services at very affordable rate.
Design and Mfg,Repairing Shaft,Axial & Radial Fans
Fan and blower selection depends on the volume flow rate, pressure, type of material handled, space limitations, and efficiency. Fan efficiencies differ from design to design and also by types.
Fans fall into two general categories: centrifugal flow and axial flow.
In centrifugal flow, airflow changes direction twice – once when entering and second when leaving (forward curved, backward curved or inclined, radial)
In axial flow, air enters and leaves the fan with no change in direction (propeller, tubeaxial, vaneaxial)
Fan Design and Selection Criteria
Precise determination of air-flow and required outlet pressure are most important in proper selection of fan type and size. The air-flow required depends on the process requirements; normally determined from heat transfer rates, or combustion air or flue gas quantity to be handled. System pressure requirement is usually more difficult to compute or predict. Detailed analysis should be carried out to determine pressure drop across the length, bends, contractions and expansions in the ducting system, pressure drop across filters, drop in branch lines, etc.